Changes to a new tax bill could mean the end of federal EV tax credits, months or even years earlier than expected.

Current law gives up to $7,500 per vehicle in tax credit for buyers who choose a plug-in electrified vehicle. It’s a big incentive for anyone looking at purchasing a plug-in car, and helps to bridge the gap between its higher cost versus a gas car.

The credit was not expected to go on forever, just for long enough to allow automakers to make EVs more affordable as technology and manufacturing caught up. Availability of the full credit was limited to the first 200,000 vehicles from each manufacturer. Once that number was reached, the cap would slowly phase out, over a little more than a year.

No manufacturer had yet hit the 200,000 car cap but estimates suggested that both GM and Tesla could hit the cap late next year, with Tesla’s pace hinging on how the Model 3 rollout progressed. Other automakers, like Nissan Ford, and BMW were looking at 2019 or 2020.

Now, House Republicans are proposing to eliminate the credit, sharply and quickly. The new tax bill from the House Ways and Means Committee would end the tax credit at the end of the 2017 tax year.

“My assumption was based on the text that we have, in order to make this as simple as possible it was going to be immediate,” said Republican Mike Bishop of Michigan, a member of the committee that wrote the bill.

SEE ALSO: Could the End of Federal Tax Credits Mean The Death of America’s EV Market?

Ending the credit could be devastating to EV sales. Look at the state of Georgia, which dropped a $5,000 credit and saw sales drop from 1,400 a month to fewer than 100.

The Alliance of Automobile Manufacturers is a trade group that represents most of the major automakers. It is worried about how automakers will meet the EV sales quotas imposed in California and 10 other states without federal assistance.

“There is no question that the elimination of the federal electric vehicle tax credit will impact the choices of prospective buyers and make the electric vehicle mandate in 10 states – about a third of the market – even more difficult to meet,” said spokeswoman Gloria Bergquist.

Environmental groups are not happy with the move either. The Natural Resources Defense Council fears the increase in pollution as well as the loss of progress the U.S. has already made toward EV leadership.

“The EV tax credit repeal would cede US leadership in clean vehicles, putting our companies at a competitive disadvantage and threatening jobs while costing drivers more at the pump and increasing pollution,” said Luke Tonachel, director of the NRDC’s Clean Vehicles and Fuels Project.

Not all legislators are happy with the bill either. Michigan Democrat Senator Debbie Stabenow, who is on the committee writing the Senate’s own tax bill, said the bill was not good for Americans.

“In so many ways this is a shell game that when it ends hurts a lot of jobs in Michigan and middle-class families and the benefits go to the wealthiest Americans,” she said, adding that “it’s not a good deal.”

The move would likely impact Tesla more than it would automakers like GM and Volkswagen. Tesla’s Model 3 has already been significantly delayed, and the low-cost EV is seen as more dependent on tax credits than the higher priced Model S and Model X. On a lower cost EV like Chevrolet’s Bolt, or the Tesla Model 3, the federal tax credit can reduce the cost to consumers by up to 20 percent. When it comes to the more expensive Model S, the impact is under 10 percent.

Larger automakers that have made massive investments into electrification have higher volumes and profits from sales of combustion engine cars and trucks that can help dampen the costs of selling EVs at a loss, and fund further EV development and sales.

The bill still has to pass a vote in the House, and the Senate is working on its own tax reform measures.