If you financed a new car that rolled off an American assembly line in 2025, you may be sitting on a federal tax deduction that did not exist a year ago. The One Big Beautiful Bill, signed into law as a reconciliation package, created a write-off for up to $10,000 in auto-loan interest per year. The deduction does not require itemizing, it is available to anyone who takes the standard deduction, and it is aimed squarely at middle-income buyers: the benefit begins phasing out once adjusted gross income crosses $100,000. The window runs from tax year 2025 through 2028.
Here is what that looks like on a real purchase. Say you finance a 2025 Ford F-150 assembled in Dearborn, Michigan, with a $35,000 loan at 6.5% APR over five years. During the first full calendar year, roughly $2,200 of your payments goes toward interest. If your AGI falls below the phaseout threshold and you are in the 22% federal bracket, that deduction trims your tax bill by about $480. Stretch the math to a $50,000 loan at the same rate and the first-year interest climbs above $3,100, pushing the savings past $680. The numbers are not life-changing on their own, but stacked on top of a potential $7,500 clean-vehicle credit for eligible EVs, they start to matter.
What the IRS has confirmed so far
Treasury and the IRS published proposed regulations in 2025 laying out three eligibility gates:
- The loan must have originated after December 31, 2024.
- The vehicle must be new and assembled in the United States.
- It must be purchased for personal use, not for a business fleet or resale.
Because the deduction sits outside Schedule A, filers who claim the standard deduction can take it. That is a meaningful distinction from the mortgage-interest write-off, which only itemizers can use, and it dramatically widens the pool of people who benefit.
The statutory authority is found in the OBBB, which added new rules for “qualified passenger vehicle loan interest” to IRC Section 163. (Readers should confirm the exact section and subsection numbers against the enrolled bill text, as codification may shift paragraph numbering.) Buyers will need to report the vehicle identification number on their return, giving the IRS a built-in audit trail that links the taxpayer, the lender, and the vehicle’s domestic-assembly status.
To claim the deduction, filers will use Part IV of a new Schedule 1-A that the IRS is developing for the 2025 tax year, filed during the 2026 season. The same form is expected to house the companion “no tax on tips,” “no tax on overtime,” and “no tax on seniors” deductions enacted in the same legislation.
Lenders, meanwhile, face a new information-reporting obligation under IRC Section 6050AA. Because the reporting infrastructure is still being built, Treasury issued transition relief for 2025, giving financial institutions extra time to comply without facing penalties.
What buyers still do not know
Several practical details remain unresolved as of June 2026, and they matter enough that buyers near the edges of eligibility should hold off on final tax calculations until the IRS publishes completed instructions.
The phaseout math. The statute sets $100,000 in AGI as the point where the deduction begins to shrink, but neither the proposed regulations nor any published IRS guidance spells out the rate at which it phases out or the income level at which it disappears entirely. A single filer earning $105,000 has no way to calculate their partial benefit yet.
The “made in America” standard. The VIN is the verification tool, and the first digit of most VINs does encode the country of assembly (“1,” “4,” or “5” generally indicates U.S. assembly). But Treasury has not released manufacturer compliance examples or explained how vehicles with significant foreign-sourced components will be treated. A buyer comparing a Ford F-150 built in Dearborn against a Chevrolet Blazer EV assembled in Ramos Arizpe, Mexico, can make a reasonable guess from the VIN, but there is no official IRS checklist to confirm it.
Other open questions tax professionals are flagging:
- Refinanced loans: If a buyer refinances a qualifying loan after purchase, it is unclear whether the replacement loan’s interest remains deductible.
- Leases: The statute targets “loan interest,” which strongly suggests lease payments do not qualify, but the IRS has not explicitly addressed this.
- Stacking with the EV credit: The Section 30D clean-vehicle credit (up to $7,500) and this new interest deduction appear to be stackable, since one is a credit and the other a deduction. No published guidance contradicts that reading, but none confirms it either.
- Used vehicles: The statute specifies “new” vehicles. Buyers financing a certified pre-owned car should not expect to qualify.
- Mid-year sales: If you sell or total a qualifying vehicle partway through the year, it is not yet clear whether you can deduct interest paid only through the date of disposition or whether the deduction is lost entirely.
Why lender reporting could slow your refund
The transition relief Treasury granted means many lenders will not have the Section 6050AA reporting system fully operational in time for the 2026 filing season. In practical terms, borrowers may not receive a standardized interest statement for their 2025 loan until weeks or months after they would normally file.
That does not mean you have to wait. Borrowers who keep their loan agreements, monthly statements, and amortization schedules can calculate deductible interest on their own. Most lenders already break out principal and interest on monthly statements, and a basic amortization calculator can verify the totals. Having that documentation ready also protects you if the IRS questions the amount claimed.
For broader context, the Federal Reserve Bank of New York’s Household Debt and Credit Report showed total auto-loan balances above $1.6 trillion as of early 2025. How much of that volume involves new, American-assembled vehicles purchased after the cutoff date is unknown, and until the IRS releases filing-season statistics, the real-world reach of this deduction will remain an estimate.
How to protect your deduction before you file
- Verify assembly origin now. Check the first character of your VIN or look up the vehicle on the NHTSA VIN decoder to confirm U.S. assembly. Save a screenshot or printout for your records.
- Track interest payments month by month. Do not rely solely on a year-end lender statement that may arrive late. Download or print each monthly statement showing the principal-interest split.
- Bookmark the IRS Newsroom. Final regulations and the completed Schedule 1-A instructions will clarify the phaseout formula and the assembly-origin standard. Checking periodically is the fastest way to catch updates.
- Model the deduction alongside other credits. If your vehicle also qualifies for the Section 30D clean-vehicle credit, work with a tax professional to project both benefits together, especially if your income is near the phaseout zone for either provision.
- Do not assume a lease qualifies. Until the IRS says otherwise, only interest on a purchase loan appears to be deductible. Buyers who are still deciding between financing and leasing should factor this into the comparison.
