The Plug-In Electric Drive Vehicle Credit (EV tax credit)--established by the Energy Improvement and Extension Act of 2008, and further amended by the American Recovery and Reinvestment Act of 2009--provides a tax rebate of up to $7,500 to U.S. purchasers of qualified plug-in electric vehicles. The tax credit is worth its full value until a manufacture sells more than 200,000 vehicles. After this threshold is met, a phase-out period begins. Starting the second quarter following the quarter in which the 200,000th vehicle is sold, the credit halves to $3,750, and after two quarters at that rate it halves again to $1,875, where it remains for another two quarters before going away entirely.