18,000 IN COMBINED HOMEBUYER TAX CREDITS FOR A LIMITED TIME .Californians have a brief window of opportunity to receive up to $18,000 in combined federal and state homebuyer tax credits. To take advantage of both tax credits, a first-time homebuyer must enter into a purchase contract for a principal residence before May 1, 2010, and close escrow between May 1, 2010 and June 30, 2010, inclusive. Buyers who are not first-time homebuyers may use the same timeframes to receive up to $16, [...]