The Worker, Homeownership, and Business Assistance Act of 2009 has extended the tax credit of up to $8,000 for qualified first-time home buyers purchasing a principal residence. The tax credit now applies to sales occurring on or after January 1, 2009 and on or before April 30, 2010. However, in cases where a binding sales contract is signed by April 30, 2010, a home purchase completed by June 30, 2010 will qualify.
The Worker, Homeownership, and Business Assistance Act of 2009 has established a tax credit of up to $6,500 for qualified move-up/repeat home buyers (existing home owners) purchasing a principal residence after November 6, 2009 and on or before April 30, 2010 (or purchased by June 30, 2010 with a binding sales contract signed by April 30, 2010).
You can find this info and answers to common faq's at this site: http://www.federalhousingtaxcredit.com
and always check with your tax advisor, just to be safe!