For 2008 Home Purchases
The Housing and Economic Recovery Act of 2008 established a tax credit for first-time homebuyers that can be worth up to $7,500. For homes purchased in 2008, the credit is similar to a no-interest loan and must be repaid in 15 equal, annual installments beginning with the 2010 income tax year.
For 2009 Home Purchases
This the credit does not have to be paid back unless the home ceases to be the taxpayer's main residence within a three-year period following the purchase.
For 2010 Home Purchases
This the credit does not have to be paid back unless the home ceases to be the taxpayer's main residence within a three-year period following the purchase.
http://www.irs.gov/uac/First-Time-Homebuyer-Credit-1
2008 Tax Credit should not have to be paid back.