Buyers who finance a new car assembled in the United States can now deduct up to $10,000 in loan interest each year for tax years 2025 through 2028. The deduction, created by the One, Big, Beautiful Bill, applies only to vehicles whose original use begins with the taxpayer and whose final assembly took place domestically. Treasury and the IRS have already issued transitional guidance for lenders adjusting to the new reporting rules, making the first filing season under this provision a live concern for dealerships, banks, and millions of car shoppers.
Why the $10,000 car-loan interest deduction demands attention right now
The new tax break arrives at a moment when auto-loan balances are elevated and interest rates remain well above the near-zero levels of a few years ago. For a buyer paying several thousand dollars a year in interest on a five- or six-year loan, the ability to write off up to $10,000 annually can meaningfully reduce the after-tax cost of ownership. That annual cap runs through 2028, giving buyers a defined four-year window to benefit.
Eligibility hinges on two conditions that narrow the pool of qualifying purchases. The vehicle must be new, meaning the taxpayer is its first owner. And its final assembly must have occurred in the United States. That second requirement puts a practical burden on shoppers: they need to verify where a car was built before signing a loan, not after. A Toyota Camry assembled in Georgetown, Kentucky, would qualify, while an identical model assembled abroad would not.
One hypothesis worth examining is whether dealerships near major domestic assembly plants will see faster adoption of the deduction. The logic is straightforward: buyers in Michigan, Kentucky, Tennessee, Alabama, and other states with large manufacturing footprints are more familiar with local plant output and can more quickly confirm a vehicle’s origin. In practice, though, the verification step is not geography-dependent. The NHTSA VIN Decoder is a free, publicly accessible federal tool that retrieves manufacturing details, including plant location, from any 17-digit vehicle identification number. A buyer in Maine can confirm U.S. assembly as easily as a buyer in Alabama. The real differentiator is likely awareness of the deduction itself, not proximity to a factory.
Because the deduction is temporary, timing matters. Buyers who plan to replace a vehicle in the next few years may find that advancing a purchase into the 2025–2028 window produces a better after-tax result than waiting until after the sunset. That calculus will depend on individual factors such as expected interest rates, income levels, and whether the taxpayer itemizes deductions. The deduction is most valuable to borrowers who pay significant interest and have enough other deductible expenses to benefit from itemizing.
IRS Notice 2025-57 and the lender reporting framework
Congress did not just create a deduction; it also imposed a new information-reporting obligation on lenders. New IRC Section 6050AA requires financial institutions and businesses that issue qualifying auto loans to report the interest paid by borrowers on specified passenger vehicles. This is the mechanism that allows the IRS to match deduction claims against actual loan records, similar to how mortgage interest is reported on Form 1098.
Because the reporting requirement is brand new, Treasury and the IRS recognized that lenders would need time to build or update their systems. In response, the agencies issued Notice 2025-57, published in Internal Revenue Bulletin 2025-45, which provides transitional guidance and penalty relief for calendar year 2025. The notice is the controlling document for first-year compliance. It gives lenders a runway to implement the reporting without facing penalties for good-faith errors during the startup period.
The Treasury and IRS announcement accompanying the notice framed the relief as a way to ensure smooth implementation for businesses newly subject to Section 6050AA. For borrowers, the practical effect is that lender-issued interest statements for 2025 may arrive in a different format or on a different timeline than established mortgage-interest forms. Taxpayers claiming the deduction should retain their own loan records as a backup.
On the lender side, the transition relief clarifies that institutions making a good-faith effort to comply will not be penalized for certain missing or incorrect data elements during the first year. That is particularly important for smaller banks, credit unions, and captive finance companies that may not have existing infrastructure for large-scale information reporting. They must still collect core data-borrower identification, loan details, and annual interest paid-but have flexibility as they refine their systems.
Dealerships that arrange financing are indirectly pulled into this framework. While the statutory reporting obligation rests with the lender, dealerships often serve as the first point of contact for customers learning about the deduction. Sales and finance staff will need at least a working understanding of which vehicles qualify and how the reporting will work so they can answer basic questions without veering into personalized tax advice.
Open questions about eligibility, form design, and the 2028 sunset
Several details remain unresolved as the deduction takes effect. The IRS has published a general guidance release reaffirming the $10,000 cap and the 2025 through 2028 window, but the agency has not yet published a consumer-facing worksheet or a finalized version of the form that lenders will use to report interest. The Federal Register entry for the car-loan interest deduction has been posted for public inspection, and the regulations.gov docket is open, but final regulatory text has not been issued.
The absence of a completed form creates a gap. Lenders know they must report, and borrowers know they can deduct, but neither side has a finished template for the exchange. That gap is manageable for 2025 because of the transition relief, but it will need to close before the 2026 filing season to avoid confusion at scale. Software providers that serve both lenders and tax preparers are also waiting on finalized specifications so they can update their systems.
Another open question is how the IRS will handle edge cases. For example, taxpayers who refinance a qualifying loan may wonder whether the interest on the new note remains deductible, and how lenders should report in a year when the original loan is paid off and a replacement loan begins. Similarly, questions arise around vehicles used partly for business and partly for personal driving, and how the deduction interacts with existing rules for business-interest and depreciation deductions. The agency’s forthcoming regulations are expected to address at least some of these scenarios.
The scheduled 2028 sunset adds another layer of complexity. Unless Congress acts to extend or modify the provision, loans originated after 2028 will not generate deductible interest under this rule, even if earlier loans are still outstanding. Taxpayers considering long loan terms may want to understand that only interest paid in tax years 2025 through 2028 is covered, not the full life of the loan. That reality could influence decisions about down payments, loan length, and whether to prioritize paying down other nondeductible debts first.
For now, the practical steps are straightforward. Shoppers who want to take advantage of the deduction should confirm that the vehicle is new, that its final assembly occurred in the United States, and that the loan is documented through a lender prepared to comply with Section 6050AA reporting. Lenders should review Notice 2025-57, coordinate with their technology providers, and train staff on the basics of the new rules. And taxpayers should be prepared to keep their own records and consult a tax professional about how the deduction fits into their broader filing strategy as the IRS fills in the remaining details.
