To be eligible the car had to be on the Power Shift Register. , these included the cleanest LPG and natural gas cars and most hybrid-, battery- and fuel cell-electric vehicles. Through to December 31, 2010, the IRS permitted the purchaser of a hybrid electric car a federal income tax credit up to $3,400. The tax credit was to be phased out two calendar quarters after the manufacturer reached 60,000 new cars sold in the following manner: it was reduced to 50% if delivered in either the third or fourth quarter after the threshold was reached, to 25% in the fifth and sixth quarters, and 0% thereafter. As of April 2010, three auto manufactures reached the 60,000 cap; Toyota Motor Company reached it in 2007, Honda in 2008, and as of April 1, 2010, no Ford Motor Company hybrid vehicles remained eligible for this tax credit. Vehicles purchased after December 31, 2010 are not eligible for this credit, as this benefit will expire on this date.