MHI Pioneer Municipal High Income Fund Inc

Pioneer Investments today announced the declaration of dividends for five closed-end funds for May 2012. The closing market price, annualized market price distribution rate, NAV, and NAV distribution rate are based on data as of May 3, 2012.

  Ex Date:             May 15, 2012 Record Date: May 17, 2012 Payable Date: May 31, 2012

Fund

     

Distribution

     

MarketPrice

   

Market PriceDistributionRate

   

NAV

     

NAVDistributionRate

Taxable

  Pioneer Diversified High Income Trust (NYSE Amex: HNW) $0.1600 $20.04 9.58 % $19.57 9.81 % Pioneer Floating Rate Trust (NYSE: PHD) $0.0750 $13.14 6.85 % $12.95 6.95 % Pioneer High Income Trust (NYSE: PHT) $0.1375 $17.17 9.61 % $13.45 12.27 %  

Tax-Exempt

Pioneer Municipal High Income Advantage Trust (NYSE: MAV) $0.0950 $15.44 7.38 % $13.09 8.71 % Pioneer Municipal High Income Trust (NYSE: MHI) $0.0950 $15.64 7.29 % $14.19 8.03 %        

Taxable-EquivalentDistribution Rateat Market Price

       

Taxable-EquivalentDistribution Rateat NAV

  Pioneer Municipal High Income Advantage Trust (NYSE: MAV) 11.35 % 13.40 % Pioneer Municipal High Income Trust (NYSE: MHI) 11.22 % 12.35 %  

Taxable-Equivalent Distribution Rate is computed using the maximum federal tax rate.

The funds are closed-end investment companies. Four of these funds trade on the New York Stock Exchange (NYSE) under the following symbols: MHI, MAV, PHT, and PHD. HNW trades on the NYSE Amex. Pioneer Investment Management, Inc. is each fund’s investment adviser.

Keep in mind, dividends are not guaranteed. Closed-end funds, unlike open-end funds, are not continuously offered. There is a one-time public offering and once issued, common shares of closed-end funds are bought and sold in the open market through a stock exchange and frequently trade at prices lower than their net asset value. Net Asset Value (NAV) is total assets less total liabilities divided by the number of common shares outstanding. For performance data on Pioneer's closed-end funds, please call 800-225-6292 or visit our closed-end pricing page.

© 2012 Pioneer Investment Management, Inc.Member of the UniCredit Banking Group,Register of Banking Groups

Not FDIC InsuredMay lose valueNo bank guarantee