$8,000 Home Buyer Tax Credit

Available for first-time home buyers. This tax credit applies to home sales between January 1, 2009 and on or before April 30, 2010. Should there be a binding sales contract signed on or before April 30, 2010, a home purchase that will completed by June 30, 2010 will also qualify.
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$6,500 Home Buyer Tax Credit

Available for repeat home buyers. Qualified move-up or repeat home buyers are eligible for a tax credit of up to $6,500, provided the purchasing of a principal residence occurs after November 6, 2009 through on or before April 30, 2010. Should there be a binding sales contract signed on or before April 30, 2010, a home purchase that will completed by June 30, 2010 will also qualify.
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Service Members Tax Credit

Military, Foreign Service and Intelligence Community Members have special rules regarding both the first-time home buyer tax credit and the repeat home buyer tax credit.
List of rules