The recently enacted Maryland law surrounding plug-in vehicle eligibility for excise tax credits will go into effect June 1. According to the legislation, the credit can only apply to vehicles that have not been modified beyond original specifications and have been acquired for use or lease, but not resale. In addition, the vehicles must be titled on or after October 1, 2010 but before July 1, 2013. The tax credit equals 100 percent of the tax on the car; there is a $2,000 maximum. 72 plug-in vehicles were registered in the state in fiscal year 2011 (FY11); 657 vehicles were registered in FY12.