First Time Property Owners Tax Credit Act of 2008 - Amends the Internal Revenue Code to allow an income-based, one-time refundable tax credit for first-time homebuyers of 5% of the purchase price of real property located in the United States, up to a maximum credit amount of $1,500 ($3,000 for joint returns). Makes such credit applicable to purchases of property on or after January 1, 2008, and before January 1, 2013, and to binding contracts made between such dates to purchase such property before July 1, 2014.