Auto Loan Interest Tax Deduction: Why Lenders and Dealers Feel Left Out

The IRS and U.S. Department of the Treasury recently issued final regulations on deducting auto loan interest payments, but industry advocates say the rules fall short of expectations.

While the policy aims to make car ownership more affordable, strict boundaries set by federal regulators limit who can actually benefit.

Made in America Only

Under the final IRS rule, interest tax deductions apply exclusively to new vehicles that underwent final assembly within the United States.

Additionally, the perk features annual benefit caps of $10,000, which phase out for individual tax filers earning over $100,000 or joint filers earning above $200,000.

The Negative Equity Problem

Industry groups like the American Financial Services Association (AFSA) expressed disappointment, particularly over the exclusion of negative equity financing from the tax deduction.

When buyers owe more on a trade-in vehicle than its current market value, lenders frequently roll that remaining balance directly into the new auto loan.

A Common Financial Hurdle

Excluding trade-in debt leaves out a significant portion of everyday car buyers who rely on financing rolled-over balances.

According to data from Edmunds, nearly 30% of new-vehicle purchases involved negative equity during the second quarter of 2026, with trade-in deficits averaging $6,884.

Industry Leaders Push for Expansion

Trade representatives argue that tax relief should reach a broader audience to fulfill what they view as Congress's original intent under the One Big Beautiful Bill Act.

Without provisions covering negative equity or foreign-assembled vehicles, automotive advocates caution that the tax incentive won't deliver its full potential boost to the market.

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