The “first-time home buyer credit” is a temporary refundable, repayable tax credit equal to 10% of the purchase price of a home, up to $7,500 for singles and married couples filing jointly. (Singles who buy a house together get only $3,750 each, as do married couples filing their tax returns separately.) [...]

But the way the credit works, it’s actually more like an interest-free loan. Two years after you claim this credit, you have to start paying it back. The payback comes over 15 years in 15 equal installments–meaning you owe an extra $500 on your tax return each year. Sell your house, and you have to pay the rest back that year from your profits. (No profits, no pay back. Also, if you die, your heirs are off the hook.)

The allowed credit starts being reduced once a single has $75,000 of modified adjusted gross income, or once a couple has $150,000 of income. The credit goes away entirely at $95,000 for singles and $170,000 for couples.