COF-N Capital One Financial Corporation

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the following Registration Statements, as listed below, of Capital One Financial Corporation and in the related Prospectuses, where applicable, of our reports dated February 23, 2024, relating to the consolidated financial statements of Discover Financial Services, and the effectiveness of Discover Financial Services’ internal control over financial reporting appearing in this Current Report on Form 8-K of Capital One Financial Corporation filed on March 11, 2024.

/s/ Deloitte & Touche LLP

Chicago, Illinois

March 11, 2024

Exhibit 99.1

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders and the Board of Directors of

Discover Financial Services

Riverwoods, IL

Opinion on Internal Control over Financial Reporting

We have audited the internal control over financial reporting of Discover Financial Services (the “Company”) as of December 31, 2023, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control — Integrated Framework (2013) issued by COSO.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated statement of financial condition, and the related consolidated statements of income, comprehensive income, changes in stockholders’ equity, and cash flows as of and for the year ended December 31, 2023, of the Company and our report dated February 23, 2024, expressed an unqualified opinion on those financial statements.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Stockholders and the Board of Directors of

Discover Financial Services

Riverwoods, IL

Opinion on the Financial Statements

We have audited the accompanying consolidated statements of financial condition of Discover Financial Services (the “Company”) as of December 31, 2023 and 2022, the related consolidated statements of income, comprehensive income, changes in stockholders’ equity, and cash flows, for each of the three years in the period ended December 31, 2023, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2023 and 2022, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2023, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 23, 2024, expressed an unqualified opinion on the Company’s internal control over financial reporting.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current-period audit of the financial statements that were communicated or required to be communicated to the audit committee and that (1) relate to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.

Allowance for Credit Losses — Credit Card Loans, Private Student Loans, and Personal Loans — Refer to Notes 2 and 4 to the financial statements

Critical Audit Matter Description

The allowance for credit losses (“allowance”) represents management’s estimate of expected credit losses over the remaining life of each loan, using relevant available information, relating to past events, current conditions, and reasonable and supportable forecasts of future economic conditions. As of December 31, 2023, the total allowance was $9.3 billion, which includes the allowance associated with the credit card loan, private student loan and personal loan portfolios of $7.6 billion, $0.9 billion, and $0.7 billion, respectively.

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The determination of the allowance estimate involves a high degree of subjectivity and requires significant estimates of current credit risk using both quantitative and qualitative analysis. Management uses statistical models, which are developed on the historical relationship between losses and predictive variables, to estimate the quantitative component of the allowance. The statistical models require that management select certain inputs for each estimate, including the macroeconomic forecast scenario, and the reasonable and supportable forecast period. In addition, management considers relevant qualitative factors that have occurred but are not yet reflected in the model estimate.

Auditing certain aspects of the allowance associated with the credit card loan, private student loan, and personal loan portfolios required a high degree of auditor judgment and an increased extent of effort, including the involvement of our credit modeling specialists. This included evaluating the (1) model methodology, including the selection of predictive variables during model development, (2) selection of key model assumptions, including the macroeconomic forecast scenario and reasonable and supportable period, and (3) qualitative analysis of the results, including the use of qualitative adjustments, if applicable.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the allowance for credit losses balance, specific to the credit card loan, private student loan, and personal loan portfolios included the following procedures, among others:

Litigation and Regulatory Matters — Card Product Misclassification Refund Liability — Refer to Note 19 to the financial statements

Critical Audit Matter Description

Beginning in 2007, the Company incorrectly classified certain credit card accounts into its highest merchant and merchant acquirer pricing tier. The misclassification affected pricing for certain merchants and merchant acquirers, but not for cardholders. As of December 31, 2023, the Company recorded a liability of $375 million within accrued expenses and other liabilities to provide refunds to merchant and merchant acquirers as a result of the card product misclassification.

The Company used facts and data available as of December 31, 2023, to develop its best estimate for the amount of refunds it expects to pay to merchant and merchant acquirers. The determination of the liability involved management judgment and estimation as a result of differences in individual merchant agreements, changes in network terms and availability of historical data.

We identified the refund liability as a critical audit matter because auditing management’s judgment in determining the methodology for the liability calculation and assumptions applied within the calculation required a high degree of auditor judgment and an increased extent of effort.

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How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the card misclassification refund liability included the following procedures, among others:

We have served as the Company’s auditor since the spin-off from its former parent company in 2007 and as Discover Bank’s (a wholly owned subsidiary of the Company) auditor since 1985.

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DISCOVER FINANCIAL SERVICES

Consolidated Statements of Financial Condition

(dollars in millions, except for share amounts)

The table below presents the carrying amounts of certain assets and liabilities of Discover Financial Services’ consolidated variable interest entities (“VIEs”), which are included in the consolidated statements of financial condition above. The assets in the table below include those assets that can only be used to settle obligations of the consolidated VIEs. The liabilities in the table below include third-party liabilities of consolidated VIEs only and exclude intercompany balances that eliminate in consolidation. The liabilities also exclude amounts for which creditors have recourse to the general credit of Discover Financial Services.

See Notes to the Consolidated Financial Statements.

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DISCOVER FINANCIAL SERVICES

Consolidated Statements of Income

(dollars in millions, except for share amounts)

See Notes to the Consolidated Financial Statements.

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DISCOVER FINANCIAL SERVICES

Consolidated Statements of Comprehensive Income

(dollars in millions)

See Notes to the Consolidated Financial Statements.

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DISCOVER FINANCIAL SERVICES

Consolidated Statements of Changes in Stockholders’ Equity

(dollars in millions, shares in thousands)

See Notes to the Consolidated Financial Statements.

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DISCOVER FINANCIAL SERVICES

Consolidated Statements of Cash Flows

(dollars in millions)

See Notes to the Consolidated Financial Statements.

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Notes to the Consolidated Financial Statements

Description of Business

Discover Financial Services (“DFS” or the “Company”) is a digital banking and payment services company. The Company is a bank holding company under the Bank Holding Company Act of 1956 and a financial holding company under the Gramm-Leach-Bliley Act. Therefore, the Company is subject to oversight, regulation and examination by the Board of Governors of the Federal Reserve System (the “Federal Reserve”). The Company provides digital banking products and services and payment services through its subsidiaries. The Company offers its customers credit card loans, personal loans, home loans and deposit products. The Company also operates the Discover Network, the PULSE network (“PULSE”) and Diners Club International (“Diners Club”), collectively known as the Discover Global Network. The Discover Network processes transactions for Discover-branded credit and debit cards and provides payment transaction processing and settlement services. PULSE operates an electronic funds transfer network, providing financial institutions issuing debit cards on the PULSE network with access to automated teller machines (“ATMs”) domestically and internationally, as well as merchant acceptance throughout the United States of America (“U.S.”) for debit card transactions. Diners Club is a global payments network of licensees, which are generally financial institutions, that issue Diners Club branded credit and charge cards and/or provide card acceptance services.

The Company manages its business activities in two segments, Digital Banking and Payment Services, based on the products and services provided. See Note 22: Segment Disclosures for a detailed description of each segment’s operations and the allocation conventions used in business segment reporting.

Basis of Presentation

The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the U.S. (“GAAP”). The preparation of financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and related disclosures. These estimates are based on information available as of the date of the consolidated financial statements. The Company believes that the estimates used in the preparation of the consolidated financial statements are reasonable. Actual results could differ from these estimates.

Certain prior year amounts have been reclassified to conform to the current year presentation. These reclassifications had no impact on the Company’s consolidated financial condition, results of operations or changes in stockholders’ equity.

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. The Company’s policy is to consolidate all entities in which it owns more than 50% of the outstanding voting stock unless it does not control the entity. However, the Company did not have a controlling voting interest in any entity other than its wholly-owned subsidiaries in the periods presented in the accompanying consolidated financial statements.

It is also the Company’s policy to consolidate any VIEs for which the Company is the primary beneficiary, as defined by GAAP. On this basis, the Company consolidates the Discover Card Master Trust I (“DCMT”) and the Discover Card Execution Note Trust (“DCENT”) as well as the student loan securitization trust. The Company is deemed to be the primary beneficiary of each of these trusts since it is, for each, the trust Servicer and the holder of both the residual interest and the majority of the most subordinated interests. Because of those involvements, the Company has, for each trust, (i) the power to direct the activities that most significantly impact the economic performance of the trust and (ii) the obligation (or right) to absorb losses (or receive benefits) of the trust that could potentially be significant. The Company has determined that it was not the primary beneficiary of any other VIE during the years ended December 31, 2023, 2022 and 2021.

For investments in any entities in which the Company owns 50% or less of the outstanding voting stock but in which the Company has significant influence over operating and financial decisions, the Company applies the equity method of accounting. The Company also applies the equity method to its investments in qualified affordable housing projects and similar tax credit partnerships. In cases where the Company’s equity investment is less than 20% and significant influence does not exist, such investments are carried at cost as they typically do not have readily determinable fair values, and are adjusted for any impairment in value. Investments in actively traded stock are carried at fair value with changes in fair value recorded as an adjustment to earnings.

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Immaterial Restatement of Prior Period Financial Statements

As reported in the second quarter of 2023, beginning in 2007, the Company incorrectly classified certain credit card accounts into its highest merchant and merchant acquirer pricing tier. The Company determined the revenue impact of the incorrect card product classification was immaterial to the consolidated financial statements for all impacted prior periods. For comparative purposes, the Company has made these corrections to the consolidated financial statements for the prior periods presented. Additionally, prior period amounts in the applicable notes to the consolidated financial statements have been corrected. The impacts of the misclassification and subsequent corrections are contained entirely within the Digital Banking segment. See Note 26: Immaterial Restatement of Prior Period Financial Statements for additional information and quantification of the prior period restatement impacts.

Recently Issued Accounting Pronouncements (Not Yet Adopted)

In December 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. This ASU enhances the transparency of income tax information through improvements to income tax disclosures primarily related to the rate reconciliation and income taxes paid. Entities are required to disaggregate the rate reconciliation (including percentages and reported amounts) by certain specified categories with additional disaggregation by nature and/or jurisdiction for items over a designated threshold. Income taxes paid (net of refunds received) must be disaggregated by federal (national), state, and foreign taxes and separately by individual jurisdiction in which that amount for a particular jurisdiction is equal to or greater than five percent of total income taxes paid (net of refunds received). This annual disclosure guidance is effective for the Company for the year ending December 31, 2025 and requires prospective application. Retrospective application is also permitted. Management will consider which method is appropriate for the Company. While the ASU implements further income tax disclosure requirements, it does not change how an entity determines its income tax obligation, and it will have no impact on the Company’s consolidated financial condition, results of operations or cash flows.

In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. The ASU requires disclosure of additional segment level information, particularly regarding significant segment expenses. Entities must disclose significant expense categories and amounts that are regularly provided to the chief operating decision maker (“CODM”) and included in the reported segment measure of profit or loss. Other segment items must also be reported, which are those items that make up the difference between segment revenues less significant segment expenses and reported segment profit or loss. Additionally, entities must disclose the identity of the CODM and how they use the reported measures of segment profit or loss for decision making and assessing segment performance. The guidance is effective for the Company for the year ending December 31, 2024, and interim periods thereafter and requires retrospective application. While the ASU implements further segment disclosure requirements, it does not change how an entity identifies its operating or reportable segments, and it will have no impact on the Company’s consolidated financial condition, results of operations or cash flows.

In March 2023, the FASB issued ASU No. 2023-02, Investments—Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method. The ASU expands the use of the proportional amortization method of accounting for tax credit investments. Currently, the method is limited to Low Income Housing Tax Credit investments. Under the amended guidance, use of proportional amortization will be available to any qualifying tax credit investments, including but not limited to investments in New Markets Tax Credit and Renewable Energy Tax Credit programs. The ASU is effective for the Company on January 1, 2024. The Company will elect the proportional amortization method for any of its qualifying tax credit investments. Management has chosen a modified-retrospective application, meaning a cumulative-effect adjustment will be recorded to the opening balance of retained earnings as of the effective date without adjusting comparative periods. Management determined that the standard will not have a material impact on the Company’s consolidated financial statements.

Recently Adopted Accounting Pronouncement

In March 2022, the FASB issued ASU No. 2022-02, Financial Instruments—Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures. The ASU eliminated the troubled debt restructuring (“TDR”) recognition and measurement guidance and enhanced disclosures for modifications of receivables to borrowers experiencing

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financial difficulty. Under ASU 2022-02, the use of a discounted cash flow method is no longer required when measuring expected credit losses on modified loans. The ASU also refined existing credit-related disclosures by requiring disclosure of current-period gross charge-offs of receivables by year of origination. The amendments in the ASU were applied prospectively to modifications and disclosures of gross charge-offs; however, adoption on a modified retrospective basis was applied for the effect on the allowance for credit losses related to the elimination of the TDR recognition and measurement guidance. The ASU became effective for the Company on January 1, 2023. Upon adoption, the Company recorded an adjustment to reduce the beginning balance of its allowance for credit losses by $68 million to reflect the elimination of the measurement guidance related to TDRs with an offsetting increase, net of tax, to beginning retained earnings.

Cash and Cash Equivalents

Cash and cash equivalents is defined by the Company as cash on deposit with banks, including time deposits and other highly liquid investments with maturities of 90 days or less when purchased, excluding amounts restricted by certain contractual or other obligations. Cash and cash equivalents included $2.0 billion and $1.5 billion of cash and due from banks and $9.7 billion and $7.4 billion of interest-earning deposits at other banks at December 31, 2023 and 2022, respectively.

Restricted Cash

Restricted cash includes cash in accounts from which the Company’s ability to withdraw funds at any time is contractually limited. Restricted cash is generally designated for specific purposes arising out of certain contractual or other obligations.

Investment Securities

At December 31, 2023, investment securities consisted of debt obligations of the U.S. Treasury and government-sponsored enterprises of the U.S. (“U.S. GSEs”) and mortgage-backed securities issued by government agencies or U.S. GSEs. Investment securities that the Company has the positive intent and ability to hold to maturity are classified as held-to-maturity and are reported at amortized cost. All other investment securities are classified as available-for-sale, as the Company does not hold investment securities for trading purposes. Available-for-sale investment securities are reported at fair value with unrealized gains and losses, net of tax, reported as a component of accumulated other comprehensive income (“AOCI”) included in stockholders’ equity. The Company estimates the fair value of available-for-sale investment securities as more fully discussed in Note 20: Fair Value Measurements. The amortized cost for each held-to-maturity and available-for-sale investment security is adjusted for amortization of premiums or accretion of discounts, as appropriate. Such amortization or accretion is included in interest income. Interest on investment securities is accrued each month in accordance with their contractual terms and recorded in other assets in the consolidated statements of financial condition. The U.S. Treasury and U.S. GSE obligations and mortgage-backed securities issued by government agencies or U.S. GSEs in which the Company invests have long histories with no credit losses and are explicitly or implicitly guaranteed by the U.S. government. Therefore, management has concluded that there is no expectation of non-payment on its investment securities and does not record an allowance for credit losses on these investments.

Loan Receivables

Loan receivables consist of credit card receivables and other loan receivables. The carrying values of all classes of loan receivables include unamortized net deferred loan origination fees and costs (also see “— Significant Revenue Recognition Accounting Policies — Loan Interest and Fee Income”). The credit card loan receivables carrying amount includes the principal amounts outstanding and uncollected billed interest and fees and is reduced for unearned revenue related to balance transfer fees (also see “— Significant Revenue Recognition Accounting Policies — Loan Interest and Fee Income”). Other loans consist of private student loans, personal loans and other loans and the carrying amount of those loans includes principal amounts outstanding. For private student loans, principal amounts outstanding also include accrued interest that has been capitalized. The Company’s loan receivables are deemed to be held-for-investment at origination or acquisition because management has the intent and ability to hold them for the foreseeable future. Cash flows associated with loans originated or acquired for investment are classified as cash flows from investing activities, regardless of a subsequent change in intent.

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Delinquent Loans and Net Charge-Offs

The entire balance of an account is contractually past due if the minimum payment is not received by the specified date on the customer’s billing statement. Delinquency is reported on loans that are 30 days or more past due.

Credit card loans are charged off at the end of the month during which an account becomes 180 days past due. Closed-end unsecured consumer loan receivables are charged off at the end of the month during which an account becomes 120 days contractually past due. Customer bankruptcies and probate accounts are charged off by the end of the month 60 days following the receipt of notification of the bankruptcy or death, but not later than the 180-day or 120-day time frame described above. Receivables associated with alleged or potential fraudulent transactions are reserved for at their net realizable value upon receipt of notification of such fraud through a charge to other expense and are subsequently written off at the end of the month 90 days following notification, but not later than the contractual 180-day or 120-day time frame described above. The Company’s charge-off policies are designed to comply with guidelines established by the Federal Financial Institutions Examination Council (“FFIEC”).

The Company’s net charge-offs include the principal amount of loans charged off less principal recoveries and exclude charged-off interest and fees, recoveries of interest and fees and fraud losses.

The practice of re-aging an account also may affect loan delinquencies and charge-offs. A re-age is intended to assist delinquent customers who have experienced financial difficulties but who demonstrate both an ability and willingness to repay. Accounts meeting specific criteria are re-aged when the Company and the customer agree on a temporary repayment schedule that may include concessionary terms. With re-aging, the outstanding balance of a delinquent account is returned to a current status. Customers may also qualify for a workout re-age when either a longer term or permanent hardship exists. The Company’s re-age practices are designed to comply with FFIEC guidelines.

Allowance for Credit Losses

The Company maintains an allowance for credit losses at a level that is appropriate to absorb net credit losses anticipated over the remaining expected life of loan receivables as of the balance sheet date. The estimate of expected credit losses considers uncollectible principal, interest and fees associated with the Company’s loan receivables existing as of the balance sheet date. Additionally, the estimate includes expected recoveries of amounts that were either previously charged off or are expected to be charged off. The allowance is evaluated quarterly for appropriateness and is maintained through an adjustment to the provision for credit losses. Charge-offs of principal amounts of loans outstanding are deducted from the allowance and subsequent recoveries of such amounts increase the allowance. Charge-offs of loan balances representing unpaid interest and fees result in a reversal of interest and fee income, respectively, which is effectively a reclassification of the provision for credit losses.

The Company calculates its allowance for credit losses by estimating expected credit losses separately for classes of receivables with similar risk characteristics. This results in segmenting the portfolio by loan product type, which is the level that the Company develops and documents its methodology for determining the allowance for credit losses. The estimate of expected credit losses for each loan product type is based on: (i) a reasonable and supportable forecast period; (ii) a reversion period; and (iii) a post-reversion period based on historical information covering the remaining life of the loan, all of which is netted with expected recoveries. The lengths of the reasonable and supportable forecast and reversion periods can vary and are subject to a quarterly assessment that considers the economic outlook and level of variability among macroeconomic forecasts. The Company applies a weighted approach in reverting from the reasonable and supportable forecast period to the post-reversion period.

Several analyses are used to help estimate credit losses anticipated over the remaining expected life of loan receivables as of the balance sheet date. The Company’s estimation process includes models that predict customer losses based on risk characteristics and portfolio attributes, macroeconomic variables and historical data and analysis. There is a significant amount of judgment applied in selecting inputs and analyzing the results produced by the models to determine the allowance.

For credit card loans, the Company uses a modeling framework that includes the following components for estimating expected credit losses:

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For private student loans and personal loans, the Company uses vintage-based models that estimate expected credit losses over the life of the loan, net of recovery estimates, impacted mainly by time elapsed since origination, credit quality of origination vintages and macroeconomic forecasts.

The components described above for credit card, private student and personal loans are developed utilizing historical data and applicable macroeconomic variable inputs based on statistical analysis and customer behavioral relationships with credit performance. Expected recoveries from loans charged off as of the balance sheet date are modeled separately and included in the allowance estimate. The Company leverages these models and recent macroeconomic forecasts for the portion of the estimate associated with the reasonable and supportable forecast period. To estimate expected credit losses for the remainder of the life of the credit card loans, the Company reverts to historical experience of credit card loans with characteristics similar to those as of the balance sheet date and observed over various phases of a credit cycle. To estimate expected credit losses for the remainder of the life of private student and personal loans, the Company generally reverts to use of average macroeconomic variables over an appropriate historical period.

The considerations in these models include past and current loan performance, loan growth and seasoning, risk management practices, account collection strategies, economic conditions, bankruptcy filings, policy changes and forecasting uncertainties. Consideration of past and current loan performance includes the post-modification performance of loans to borrowers experiencing financial difficulty. For the credit card loan portfolio, the Company estimates its credit losses on a loan-level basis, which includes loans that are delinquent and/or no longer accruing interest and/or loans that have been restructured. For the remainder of its portfolio, including private student, personal and other loans, the Company estimates its credit losses on a pooled basis. For all loan types, recoveries are estimated at a pooled level based on estimates of future cash flows derived using historical experience.

Accrued interest receivable on credit card loans is included in the estimate of expected credit losses once billed to the customer (i.e., once the interest becomes part of the loan balance). Except as noted in the following sentence, an allowance for credit losses is not recorded for unbilled credit card interest or accrued interest receivable on other loan classes as the impact to the allowance for credit losses is not material. Accrued interest receivable on student loans that have not yet entered repayment is included in the estimate of expected credit losses.

No liability for expected credit losses is required for unused lines of credit on the Company’s credit card loans because they are unconditionally cancellable. The Company records a liability for expected credit losses for unfunded commitments on all other loans, which is presented as part of accrued expenses and other liabilities in the consolidated statements of financial condition. This liability is evaluated quarterly for appropriateness and is maintained through an adjustment to the provision for credit losses.

As part of certain collection strategies, the Company may modify the terms of loans to customers experiencing financial hardship. Temporary and permanent modifications on credit card and personal loans, as well as temporary modifications on private student loans and certain grants of private student loan forbearance are generally subject to disclosure as loan modifications to borrowers experiencing financial difficulty.

Loan receivables that have been modified are subject to the same requirements for the accrual of expected credit loss over their expected remaining lives as described above for unmodified loans. The effects of all loan modifications, whether or not they are subject to disclosure as loan modifications to borrowers experiencing financial difficulty, are reflected in the allowance for credit losses.

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Premises and Equipment, net

Premises and equipment, net, are stated at cost less provisions for impairment and accumulated depreciation and amortization. Accumulated depreciation and amortization is computed using the straight-line method over the estimated useful lives of the assets. The Company periodically reviews the estimated useful lives and may adjust them as necessary. Buildings are depreciated over a period of thirty- nine years. The costs of improvements are capitalized and depreciated either over the asset’s estimated useful life, typically ten years to fifteen years, or over the remaining term of the lease, when applicable. Furniture and fixtures are depreciated over a period of five years to ten years. Equipment is depreciated over three years to ten years. Maintenance and repairs are immediately expensed when incurred, while the costs of significant improvements are capitalized.

Purchased software and capitalized costs related to internally developed software are amortized over their useful lives of three years to ten years. Costs incurred during the application development stage related to internally developed software are capitalized. Costs are expensed as incurred during the preliminary project stage and post implementation stage. Once the capitalization criteria as defined in GAAP have been met, external direct costs incurred for materials and services used in developing or obtaining internal-use computer software and payroll and payroll-related costs for employees who are directly associated with the internal-use computer software project (to the extent those employees devoted time directly to the project) are capitalized. Amortization of capitalized costs begins when the software is ready for its intended use. Capitalized software is included in premises and equipment, net in the Company’s consolidated statements of financial condition. See Note 6: Premises and Equipment for further information about the Company’s premises and equipment.

Cloud computing arrangements involving the licensing of software that meet certain criteria are recognized as the acquisition of software. Such assets are measured at the present value of the license obligation, if the license is to be paid over time, in addition to any capitalized upfront costs and amortized over the life of the arrangement. Cloud computing arrangements that do not meet the criteria to be recognized as acquired software are accounted for as service contracts. To date, none of the Company’s cloud computing arrangements have met the criteria to be recognized as acquired software.

Premises and equipment are subject to impairment testing when events or conditions indicate that the carrying value of the asset may not be fully recoverable from future cash flows. A test for recoverability is done by comparing the asset’s carrying value to the sum of the undiscounted future net cash inflows expected to be generated from the use of the asset over its remaining useful life. Impairment exists if the sum of the undiscounted expected future net cash inflows is less than the carrying amount of the asset. Impairment would result in a write-down of the asset to its estimated fair value. The estimated fair values of these assets are based on the discounted present value of the stream of future net cash inflows expected to be derived over the remaining useful lives of the assets. If an impairment write-down is recorded, the remaining useful life of the asset will be evaluated to determine whether revision of the remaining amortization or depreciation period is appropriate.

Goodwill

Goodwill is recorded as part of the Company’s acquisitions of businesses when the purchase price exceeds the fair value of the net tangible and separately identifiable intangible assets acquired. The Company’s goodwill is not amortized, but rather is subject to an impairment test at the reporting unit level annually as of October 1, or between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company’s reported goodwill relates to PULSE, which it acquired in 2005. The Company’s goodwill is tested for impairment by comparing the fair value of the reporting unit to its carrying value. If the fair value of the reporting unit exceeds its carrying value, goodwill is not impaired. If the carrying value exceeds its fair value, an impairment loss must be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. No impairment was identified during the impairment test conducted as of October 1, 2023.

Stock-based Compensation

The Company measures the cost of services received from employees and non-employee directors in exchange for an award of stock- based compensation based on the grant-date fair value of the award. The cost, net of estimated forfeitures, is recognized over the requisite service period. Awards to employees who are retirement-eligible at any point during the year are amortized over 12 months in accordance with the vesting terms that apply under those circumstances. No compensation cost is recognized for awards that are subsequently forfeited.

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Advertising Costs

The Company expenses television and radio advertising costs in the period in which the advertising is first aired and all other advertising costs as incurred. Advertising costs are recorded in marketing and business development and were $359 million, $307 million and $262 million for the years ended December 31, 2023, 2022 and 2021, respectively.

Income Taxes

Income tax expense is provided for using the asset and liability method, under which deferred tax assets and liabilities are determined based on the temporary differences between the financial reporting and income tax bases of assets and liabilities using currently enacted tax rates. Deferred tax assets are recognized when their realization is determined to be more likely than not. A valuation allowance is provided if the Company believes it is more likely than not that all or some portion of the deferred tax asset will not be realized. An increase or decrease in the valuation allowance that results from a change in circumstances and which causes a change in management’s judgment about the realizability of the related deferred tax asset is included in the current tax provision. Uncertain tax positions are measured at the highest amount of tax benefit for which realization is judged to be more likely than not. Tax benefits that do not meet these criteria are unrecognized tax benefits. The Company recognizes and reports interest and penalties, if necessary, related to uncertain tax positions within its provision for income tax expense. See Note 15: Income Taxes for more information about the Company’s income taxes.

Accumulated Other Comprehensive Income

The Company records unrealized gains and losses on available-for-sale securities, changes in the fair value of cash flow hedges and certain pension and foreign currency translation adjustments in other comprehensive income (“OCI”) on an after-tax basis where applicable. The Company’s policy is to adjust the tax effects of a component of AOCI in the same period in which the item is sold or otherwise derecognized, or when the carrying value of the item is remeasured. Details of OCI, net of tax, are presented in the statement of comprehensive income and a roll forward of AOCI is presented in the consolidated statements of changes in stockholders’ equity and Note 13: Accumulated Other Comprehensive Income.

Significant Revenue Recognition Accounting Policies

Loan Interest and Fee Income

Interest on loans is composed largely of interest on credit card loans and is recognized based on the amount of loans outstanding and their contractual interest rate. Interest on credit card loans is included in loan receivables when billed to the customer. The Company accrues unbilled interest revenue each month from a customer’s billing cycle date to the end of the month. The Company applies an estimate of the percentage of loans that will revolve in the next cycle in the estimation of the accrued unbilled portion of interest revenue that is included in other assets on the consolidated statements of financial condition. Interest on other loan receivables is accrued each month in accordance with their contractual terms and recorded in other assets in the consolidated statements of financial condition.

The Company recognizes fees (except balance transfer fees and certain product fees) on loan receivables in interest income or loan fee income as the fees are assessed. Balance transfer fees and certain product fees are recognized in interest income or loan fee income ratably over the periods to which they relate. Balance transfer fees are accreted to interest income over the estimated life of the related balance. As of December 31, 2023 and 2022, deferred revenues related to balance transfer fees, recorded as a reduction of loan receivables, were $107 million and $85 million, respectively. Loan fee income consists of fees on credit card loans and includes late, cash advance, returned check and other miscellaneous fees and is reflected net of waivers and charge-offs.

Direct loan origination costs on credit card loans are deferred and amortized on a straight-line basis over a one year period and recorded in interest income from credit card loans. Direct loan origination costs on other loan receivables are deferred and amortized over the life of the loan using the interest method and are recorded in interest income from other loans. As of December 31, 2023 and 2022, the remaining unamortized deferred costs related to loan origination were $306 million and $298 million, respectively, and were recorded in loan receivables.

The Company accrues interest and fees on credit card and closed-end loan receivables until the loans are paid or charged off, except in instances of customer bankruptcy, death or suspected fraud, where no further interest and fee accruals occur following notification. Upon completion of the fraud investigation, non-fraudulent credit card and closed-end consumer loan receivables may resume accruing interest. Payments received on non-accrual loans are allocated

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according to the same payment hierarchy applied to loans that are accruing interest. When loan receivables are charged off, unpaid accrued interest and fees are reversed against the income line items in which they were originally recorded in the consolidated statements of income. Charge-offs and recoveries of amounts that relate to capitalized interest on private student loans are treated as principal charge-offs and recoveries, affecting the provision for credit losses rather than interest income. The Company considers uncollectible interest and fee revenues in assessing the adequacy of the allowance for credit losses.

Interest income from loans disclosed as modifications to borrowers experiencing financial difficulty is accounted for in the same manner as other accruing loans. Cash collections on these loans are allocated according to the same payment hierarchy applied to loans that have not been modified.

Discount and Interchange Revenue

The Company earns discount revenue from fees charged to merchants with whom it has entered into card acceptance agreements for processing credit card purchase transactions. The Company earns acquirer interchange revenue primarily from merchant acquirers on Discover Network, Diners Club and PULSE transactions made by credit and debit card customers at merchants with whom merchant acquirers have entered into card acceptance agreements for processing payment card transactions. These card acceptance arrangements generally renew automatically and do not have fixed durations. Under these agreements, the Company stands ready to process payment transactions as and when each is presented. The Company earns discount, interchange and similar fees only when transactions are processed. Contractually defined per-transaction fee amounts typically apply to each type of transaction processed and are recognized as revenue at the time each transaction is captured for settlement. These fees are typically collected by the Company as part of the process of settling transactions daily with merchants and acquirers and are fully earned at the time settlement is made.

The Company pays issuer interchange to card-issuing entities that have entered into contractual arrangements to issue cards on the Discover Network and on certain transactions on the Diners Club and PULSE networks. This cost is contractually established and is based on the card-issuing organization’s transaction volume. The Company classifies this cost as a reduction of discount and interchange revenue. Costs of cardholder reward arrangements, including the Cashback Bonus reward program, are classified as reductions of discount and interchange revenue pursuant to guidance under Accounting Standards Codification (“ASC”) Topic 606 governing consideration payable to a customer. For both issuer interchange and transaction-based cardholder rewards, the Company accrues the cost at the time each underlying card transaction is captured for settlement.

Customer Rewards

The Company offers its customers various reward programs, including the Cashback Bonus reward program, pursuant to which the Company pays certain customers a reward equal to a percentage of their credit card purchase amounts based on the type and volume of the customer’s purchases. The liability for customer rewards is recorded on an individual customer basis and is accumulated as qualified customers earn rewards through their ongoing credit card purchase activity or other defined actions. The Company recognizes customer rewards costs as a reduction of the related revenue, if any. In instances where a reward is not associated with a revenue-generating transaction, such as when a reward is given for opening an account, the reward cost is recorded as an operating expense. For the years ended December 31, 2023, 2022 and 2021, rewards costs amounted to $3.1 billion, $3.0 billion and $2.5 billion, respectively. The liability for customer rewards was $2.2 billion at December 31, 2023 and 2022, and is included in accrued expenses and other liabilities on the consolidated statements of financial condition.

Protection Products Revenue

The Company earns revenue related to fees received for providing ancillary products and services, including payment protection and identity theft protection services, to its credit card customers. A portion of this revenue comprises amounts earned for arranging for the delivery of products offered by third-party service providers. The amount of revenue recorded is generally based on either a percentage of a customer’s outstanding balance or a flat fee, in either case assessed monthly and recognized as earned. These contracts are month-to-month arrangements that are cancellable at any time. The Company recognizes each monthly fee in the period to which the service or coverage relates.

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Transaction Processing Revenue

Transaction processing revenue represents switch fees charged to financial institutions and merchants under network participation agreements for processing ATM and debit transactions over the PULSE network, as well as various participation and membership fees. Network participation agreements generally renew automatically and do not have fixed durations, although the Company does enter into fixed-term pricing or incentive arrangements with certain network participants. Similar to discount and interchange fees, switch fees are contractually defined per-transaction fee amounts and are assessed and recognized as revenue at the time each transaction is captured for settlement. These fees are typically collected by the Company as part of the process of settling transactions with network participants. Membership and other participation fees are recognized over the periods to which each fee relates.

Other Income

Other income includes gains and losses on equity investments, sales-based royalty revenues earned by Diners Club, merchant fees, revenues from network partners and other miscellaneous revenue items. Unrealized gains and losses on equity investments carried at fair value are recognized quarterly based on changes in their respective fair values. Sales-based royalty revenues are recognized as the related sales are reported by Diners franchisees. All remaining items of other income are recognized as the related performance obligations are satisfied.

Future Revenue Associated with Customer Contracts

For contracts under which the Company processes payment card transactions, the Company has the right to assess fees for services performed and to collect those fees through the settlement process. The Company generates essentially all of its discount and interchange revenue and transaction processing revenue, as well as some revenue reported as other income, through such contracts. There is no specified quantity of service promised in these contracts as the number of payment transactions is dependent upon cardholder behavior, which is outside the control of the Company and its network customers (i.e., merchants, acquirers, issuers and other network participants). As noted above, these contracts are typically without fixed durations and renew automatically. For these reasons, the Company does not make or disclose an estimate of revenue associated with performance obligations attributable to the remaining terms of these contracts. Future revenue associated with the Company’s sales-based royalty revenues earned from Diners Club licensees is similarly variable and open-ended and therefore the Company does not make or disclose an estimate of royalties associated with performance obligations attributable to the remaining terms of the licensing and royalty arrangements. Because of the nature of the services and the manner of collection associated with the majority of the Company’s revenue from contracts with customers, material receivables or deferred revenues are not generated.

Incentive Payments

The Company makes certain incentive payments under contractual arrangements with financial institutions, Diners Club licensees, merchants, acquirers and certain other customers. These payments are generally classified as contra-revenue unless a distinct good or service is received by the Company in exchange for the payment and the fair value of the good or service can be reasonably estimated. If no such good or service is identified, then the entire payment is classified as contra-revenue and included in the consolidated statements of income in the line item where the related revenues are recorded. If the payment gives rise to an asset because it is expected to directly or indirectly contribute to future net cash inflows, it is deferred and recognized over the expected benefit period. The unamortized portion of the deferred incentive payments included in other assets on the consolidated statements of financial condition was $27 million and $32 million at December 31, 2023 and 2022, respectively.

The Company’s other short-term investments and investment securities consist of the following (dollars in millions):

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The amortized cost, gross unrealized gains and losses and fair value of available-for-sale and held-to-maturity investment securities are as follows (dollars in millions):

The Company invests in U.S. Treasury obligations and securities issued by government agencies or U.S. GSEs, which have long histories with no credit losses and are explicitly or implicitly guaranteed by the U.S. federal government. Therefore, management has concluded that there is no expectation of non-payment on its investment securities and does not record an allowance for credit losses on these investments. In addition, the Company does not have the intent to sell any available-for-sale securities in an unrealized loss position and does not believe it is more likely than not that it will be required to sell any such security before recovery of its amortized cost basis.

The following table provides information about available-for-sale investment securities with aggregate gross unrealized losses and the length of time that individual investment securities have been in a continuous unrealized loss position (dollars in millions):

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During the years ended December 31, 2023 and 2022, the Company had no sales of available-for-sale securities. The Company received $5 million of proceeds from the sale of available-for-sale securities during the year ended December 31, 2021. See Note 13: Accumulated Other Comprehensive Income for unrealized gains and losses on available-for-sale securities during the years ended December 31, 2023, 2022 and 2021.

Maturities and weighted-average yields of available-for-sale debt securities and held-to-maturity debt securities are provided in the following tables (dollars in millions):

Taxable interest on investment securities was $449 million, $179 million and $182 million for the years ended December 31, 2023, 2022 and 2021, respectively. There was no U.S. federal income tax-exempt interest on investment securities for the years ended December 31, 2023, 2022 and 2021.

Other Investments

As a part of the Company’s community reinvestment initiatives, the Company has made equity investments in certain limited partnerships and limited liability companies that finance the construction and rehabilitation of affordable rental housing and stimulate economic development in low-to moderate-income communities. These investments are accounted for using the equity method of accounting and are recorded within other assets. The related commitment for future investments is recorded in accrued expenses and other liabilities within the consolidated statements of financial condition. The portion of each investment’s operating results allocable to the Company reduces the carrying value of the investments and is recorded in other expense within the consolidated statements of income. The Company further reduces the carrying value of the investments by recognizing any amounts that are in excess of future net tax benefits in other expense. The Company earns a return primarily through tax credits allocated to the affordable housing projects and the community revitalization projects. The Company does not consolidate these investments as the Company does

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not have a controlling financial interest in the investee entities. As of December 31, 2023 and 2022, the Company had outstanding investments in these entities of $514 million and $416 million, respectively, and related contingent liabilities for unconditional and legally binding delayed equity contributions of $187 million and $111 million, respectively. Of the above outstanding equity investments, the Company had $456 million and $375 million of investments related to affordable housing projects as of December 31, 2023 and 2022, respectively, which had $155 million and $100 million of related contingent liabilities for unconditional and legally binding delayed equity contributions, respectively.

The Company holds non-controlling equity positions in several payment services entities and third-party venture capital funds, which invest in such entities. Most of the direct investments in such entities are not subject to equity method accounting because the Company does not have significant influence over the investee. The Company’s investments in third-party venture capital funds represent limited partnership interests and are accounted for under the equity method. The common or preferred equity securities that the Company holds typically do not have readily determinable fair values. As a result, these investments are carried at cost minus impairment, if any. As of December 31, 2023 and 2022, the carrying value of these investments, which are recorded within other assets on the Company’s consolidated statements of financial condition, was $35 million and $39 million, respectively.

The Company also holds non-controlling equity positions in payment service entities that have actively traded stock and therefore have readily determinable fair values. As a result, these investments are carried at fair value based on the quoted share prices. As of December 31, 2023, the carrying values of these investments, which are recorded within other assets on the Company’s consolidated statements of financial condition, were immaterial. As of December 31, 2022, the carrying values of these investments were $41 million. During the year ended December 31, 2023, the Company recognized an immaterial net loss on the consolidated statements of income related to these investments. The Company recognized a net loss of $214 million during the year ended December 31, 2022. The Company recognized a net gain of approximately $423 million during the year ended December 31, 2021.

The Company has two loan portfolio segments: credit card loans and other loans.

The Company’s classes of receivables within the two portfolio segments are depicted in the following table (dollars in millions):

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Credit Quality Indicators

As part of credit risk management activities, on an ongoing basis, the Company reviews information related to the performance of a customer’s account with the Company and information from credit bureaus, such as FICO or other credit scores, relating to the customer’s broader credit performance. The Company actively monitors key credit quality indicators, including FICO scores and delinquency status, for credit card, private student and personal loans. These indicators are important to understand the overall credit performance of the Company’s customers and their ability to repay.

FICO scores are generally obtained at the origination of the account and are refreshed monthly or quarterly thereafter to assist in predicting customer behavior. Historically, the Company has noted that accounts with FICO scores below 660 have larger delinquencies and credit losses than those with higher credit scores.

The following table provides the distribution of the amortized cost basis (excluding accrued interest receivable presented in other assets) by the most recent FICO scores available for the Company’s customers for credit card, private student and personal loan receivables (dollars in millions):