New tax break for auto loans could save some buyers thousands of dollars. But will it boost sales?

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Millions of people receive a federal tax deduction for the interest they pay on home loans. Under President Donald Trump’s new tax-cut law, many people for the first time also could claim a tax deduction for interest on their vehicle loans.

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The new tax break will be available even to people who don’t itemize deductions. But there are some caveats that could limit its reach. The vehicles must be new, not used. They must be assembled in the U.S. And the loans must be issued no sooner than this year, to list just a few qualifications.

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Here are some things to know about the new auto loan interest tax deduction:

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Candidate Trump promised an auto loan interest tax break

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Trump pledged while campaigning last year to make interest on car loans tax-deductible. He said it would make car ownership more affordable and “stimulate massive domestic auto production.”

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The idea made it into the big tax-cut bill passed by Congress, which Trump signed into law July 4.

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The law allows taxpayers to deduct up to $10,000 of interest payments annually on loans for new American-made vehicles from 2025 through 2028. It applies to cars, motorcycles, sport utility vehicles, minivans, vans and pickup trucks weighing less than 14,000 pounds, a threshold referred to as light vehicles. But it only applies to vehicles purchased for personal use, not for fleets or commercial purposes.

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The tax break can be claimed starting on 2025 income tax returns. But the deduction phases out for individuals with incomes between $100,000 and $150,000 or joint taxpayers with incomes between $200,000 and $250,000. Those earning more cannot claim the tax break.

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Millions of buyers could benefit, but millions of others will not

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U.S. automobile dealers sold 15.9 million new light vehicles last year, a little over half of which were assembled in the U.S, according to Cox Automotive. It says around 60% of retail sales are financed with loans.

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After excluding fleet and commercial vehicles and customers above the income cutoff, an estimated 3.5 million new vehicle loans could be eligible for the tax break this year, if purchasing patterns stay the same, said Jonathan Smoke, chief economist at Cox Automotive.

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It’s the assembly plant, not the automaker’s headquarters that matters

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The tax break applies to vehicles assembled in the U.S., no matter where the company making them is headquartered. All Tesla vehicles sold in the U.S. are assembled in this country. But so are all Acura brands, the luxury model of Japanese automaker Honda.

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Last year, 78% of Ford vehicles sold in the U.S. were assembled in this country, according to Cox Automotive. But customers wanting the tax break will need to pay attention to specific models. While the Ford Mustang is assembled in Michigan, the Mustang Mach-E is built in Mexico.