Fannie Mae and Freddie Mac Taxpayer Payback Act of 2011 - Amends the Federal National Mortgage Association Charter Act and the Federal Home Loan Mortgage Corporation Act to prohibit a reduction in the rate of dividends paid on the Variable Liquidation Preference Senior Preferred Stock of the Federal National Mortgage Association (Fannie Mae) and the Federal Home Loan Mortgage Corporation (Freddie Mac) purchased by the Secretary of the Treasury.