The California Association of Realtors stated that military personnel have an extra year, through June 2011, to buy a principal residence in the U.S. and claim the federal tax credit.  The deadline for entering a binding contract is April 30, 2011; the deadline to close a purchase is June 30, 2011. The extension applies to any individual (and, if married, the individual’s spouse) who serves on qualified official extended duty service outside of the United States for at least 90 days during the period beginning after Dec. 31, 2008, and ending before May 1, 2010.  All other home buyers must be under contract by this Friday (April 30) and close by June 30 to qualify for the federal tax credit.