Depends on what one you're talking about. I haven't heard about one for this year yet, but last year they had one for first time home buyers. Where you'd get a tax credit (One you didn't pay back) up to a certain amount after buying a home. The year before you had to pay it back, but last year they changed it. Unless you sell your home within the first three years you don't have to pay it back.
However, I don't know if there is one this year. Go to USA.gov and see if there is one.
at 4:47 PM on Jan. 23, 2011