Getting a $7,500 tax break for the purchase of a new electric vehicle will likely get harder in a few months — meaning prospective buyers who want the financial incentive may wish to speed up their timeline.

The Inflation Reduction Act, a historic climate law President Biden signed in August, tweaked rules for an existing tax credit associated with the purchase of “clean” vehicles.

The law, which extended the tax break through 2031, changed some requirements to get the full $7,500 value of the “clean vehicle credit.”

Some tax and auto experts think the tweaks — largely intended to bring more manufacturing and supply chains within U.S. borders and those of allies — will temporarily make it more difficult to qualify for all or part of the credit.

Some of the tax credit rules took effect on Jan. 1. (More on those, below.) But others pertaining to battery minerals and components — arguably the more challenging to meet — don’t take effect until the IRS issues guidance. The agency expects to do that in March 2023.