EV Credits, Emissions Rules and Tariffs Now Face Congress

By Marcus Bennett

Three federal clean-vehicle credits became unavailable to buyers acquiring vehicles after Sept. 30, 2025, and only a new law can restore them. Public Law 119-21, signed July 4, 2025, applies the cutoff to the new clean vehicle, previously owned clean vehicle and qualified commercial clean vehicle credits. The Internal Revenue Service (IRS) says a binding written contract and payment by Sept. 30 still qualify a vehicle when delivery occurs later.

Those dates sit in the tax code, not an agency rule. News organizations projected Democratic majorities in the House and Senate after the Nov. 3 midterms, with Congress due to convene in January. Any new federal credit would require legislation, although some states operate separate programs.

Federal vehicle rules come from statutes, agency rulemakings and presidential proclamations. That division determines which measures Congress can change by law and which require further agency or White House action.

What can Congress change directly?

Congress can amend the underlying statutes, as Public Law 119-21 did with the fuel-economy penalty. It can also use the Congressional Review Act, a procedure for disapproving an agency rule through a joint resolution sent to the president like any other bill.

On June 12, 2025, the president signed three such resolutions disapproving Environmental Protection Agency (EPA) decisions that granted California waivers. The White House said the EPA cannot approve future waivers that are “substantially the same.”

Which emissions and fuel-economy rules are final?

The EPA signed a final rule on Feb. 12, 2026 that rescinded its 2009 greenhouse-gas endangerment finding, the legal finding underpinning those rules. The rule also repealed all greenhouse-gas standards for light-, medium- and heavy-duty vehicles and engines. The agency published the rule Feb. 18, and it took effect April 20, 2026.

The notice directs petitions for review to the U.S. Court of Appeals for the D.C. Circuit. The National Highway Traffic Safety Administration (NHTSA) announced its final fuel-economy rule Sept. 28, 2026.

The rule covers model years 2022 through 2031 and takes effect Nov. 30, 2026. The Department of Transportation says it ends the credit-trading program starting in model year 2028.

NHTSA projects a combined fleet average of 34.9 mpg in model year 2031, comprising 40.2 mpg for passenger cars and 26.4 mpg for light trucks. The civil penalty for missing a fuel-economy standard is $0.

Public Law 119-21 set the penalty at zero, and NHTSA’s analysis assumes no penalties, so the targets exist without a fine attached. NHTSA says Section 49 U.S.C. 32902 prevents the agency from considering electric vehicles when setting standards.

The projected averages therefore include gasoline, diesel and non-plug-in hybrid vehicles only. Automakers can still earn credit for EVs under a Department of Energy formula.

Where do vehicle tariffs stand?

Vehicle tariffs rest on Section 232 of the Trade Expansion Act of 1962. A March 26, 2025 proclamation imposed a 25% tariff on listed automobiles entered on or after April 3, 2025, with parts following by May 3. It says the tariffs stay in place “unless such actions are expressly reduced, modified, or terminated.”

The U.S. Trade Representative’s July 1, 2026 report to Congress lists the current rates. Vehicles from the European Union, Japan and South Korea face a 15% all-in baseline, while the United Kingdom has a 10% rate on a quota of 100,000 vehicles.

Vehicles qualifying under the United States-Mexico-Canada Agreement face tariffs only on their non-U.S. content. U.S.-assembled vehicles can claim an offset worth 3.75% of manufacturer’s suggested retail price through April 30, 2030.

The trade representative’s report notes that Commerce had not published a process for applying the tariff only to the non-U.S. content of qualifying parts, so those parts remain exempt for now. Automakers are reporting the financial effects.

Audi’s quarterly report attributed a 27% first-quarter decline in North American deliveries primarily to U.S. tariffs and the end of U.S. electric-car subsidies. Volkswagen’s investor presentation put its tariff burden at 2.1 billion euros through September.

What does this change for the next vehicle purchase?

For buyers, the federal credit deadline changes purchase eligibility first: a qualifying contract and payment by Sept. 30, 2025 preserve the benefit despite later delivery. Tariff exposure then depends on origin, U.S. content and assembly location. Emissions and fuel-economy rules shape automaker portfolios and future products, not consumer credit eligibility.

What should be watched next?

Four developments have dates or sit on the record. They cover the next effective date, the court challenge, a missing administrative process and possible congressional action.

• The NHTSA fuel-economy rule takes effect Nov. 30, 2026.
• EPA-rule petitions go to the D.C. Circuit.
• Commerce could publish the process for non-U.S. content in qualifying parts.
• Congress convenes in January, when bills or resolutions on credits, fuel-economy penalties or tariffs could be introduced.

The next fixed date is Nov. 30, 2026, when the NHTSA rule takes effect. The other checkpoints are judicial review, Commerce’s parts procedure and whether January produces a bill or resolution.