Amends Internal Revenue Code provisions relating to the first-time homebuyer tax credit to: (1) extend such credit to all purchasers of a principal residence (currently, limited to first-time homebuyers); (2) extend such credit and its waiver of recapture provisions (for sales of principal residences before the required holding period) through June 30, 2010; (3) extend through December 31, 2009, the election to treat, for tax purposes, a residence purchased in 2009 as having been purchased on December 31, 2008; (4) allow taxpayers to treat, for tax purposes, a residence purchased after December 31, 2009, and before July 1, 2010, as having been purchased on December 31, 2009; (5) increase adjusted gross income thresholds for determining eligibility for such credit; and (6) allow a waiver of recapture for members of the Armed Forces who are relocated.