This is an excerpt from:
THE AMERICAN RECOVERY AND REINVESTMENT ACT OF 2009 – FEBRUARY 12, 2009 FULL SUMMARY OF PROVISIONS FROM SENATE FINANCE, HOUSE WAYS & MEANS COMMITTEES
Refundable First-time Home Buyer Credit. Last year, Congress provided taxpayers with a refundable tax credit that was equivalent to an interest-free loan equal to 10 percent of the purchase of a home (up to $7,500) by first-time home buyers. The provision applies to homes purchased on or after April 9, 2008 and before July 1, 2009. Taxpayers receiving this tax credit are currently required to repay any amount received under this provision back to the government over 15 years in equal installments, or, if earlier, when the home is sold. The credit phases out for taxpayers with adjusted gross income in excess of $75,000 ($150,000 in the case of a joint return). The bill eliminates the repayment obligation for taxpayers that purchase homes after January 1, 2009, increases the maximum value of the credit to $8,000, and removes the prohibition on financing by mortgage revenue bonds, and extends the availability of the credit for homes purchased before December 1, 2009. The provision would retain the credit recapture if the house is sold within three years of purchase. This proposal is estimated to cost $6.638 billion over 10 years.
You can see the entire summary at: http://finance.senate.gov/press/Bpress/2009press/prb021209.pdf