Buyers have until Sept. 30 to qualify for the credit now that Congress has passed the spending bill, which ends the program.

Sweeping tax and budget legislation approved by Congress on Thursday means $7,500 tax credits for buying or leasing new electric vehicles will end on September 30, as well as a $4,000 used EV credit, that have helped juice green vehicle sales in recent years.

Sales are likely to dip below forecasts but not completely bottom out thanks to an array of new models and incentives from states and dealers.