Car Loan Interest Deduction Explained: New, US-Assembled Vehicles Only
For the first time since the 1980s, many Americans can deduct interest on a personal car loan. The new deduction, available for tax years 2025 through 2028, allows up to $10,000 a year of interest on a loan used to buy a qualifying new vehicle. It comes with conditions about the vehicle, the loan and your income, and the IRS issued final regulations in September 2026 that settle many of the details. On November 3, 2026, as dealers began year-end promotions, the IRS published a tax tip reminding buyers of the rules. This guide explains them in the order you would check them at the dealership.
The vehicle must be new
The original use of the vehicle has to start with you. A used car — even a one-year-old model with very few miles — does not qualify, no matter when the loan was made. If the car has been titled to someone else before, assume it is not new until you confirm otherwise with the dealer and the final regulations.
Final assembly in the United States
The vehicle must have undergone final assembly in the United States. This is a narrower test than "American brand": some vehicles from US-headquartered manufacturers are assembled in Mexico or Canada, while many foreign brands assemble cars in Alabama, Kentucky, South Carolina, Tennessee or Indiana. The IRS lists three ways to check: the information label on the vehicle at the dealership, the vehicle identification number itself, and the NHTSA VIN decoder, which reports the plant of manufacture. Check the specific vehicle you are buying, because the same model can be built in more than one plant.
Eligible vehicle types and weight
Cars, minivans, vans, SUVs, pickup trucks and motorcycles qualify if the gross vehicle weight rating is under 14,000 pounds. That covers almost every passenger vehicle; heavy-duty work trucks above the limit do not qualify. Recreational vehicles and trailers are outside the scope.
The loan conditions
The interest must be paid on a loan that was originated after December 31, 2024, was used to purchase the vehicle, is secured by a lien on the vehicle and was for personal rather than business use. A personal loan that is not secured by the car does not qualify, and neither does a credit card used for the down payment. Leases are not loans and are excluded. If you later refinance a qualifying loan, interest on the refinanced amount is generally still eligible; the regulations explain how to treat refinancing that adds new borrowing for other purposes.
Loans owed to a related person are excluded. Dealer financing, banks, credit unions and captive finance companies are the normal case.
Report the VIN
You must include the vehicle identification number on your return for each year you claim the deduction. Lenders that receive interest of $600 or more on qualifying loans are required to file information returns, so the IRS can match your claim to the lender's report. Keep the purchase contract and the lender's year-end interest statement with your records.
How much you can deduct
The deduction is the interest actually paid during the year, up to $10,000. Most buyers are far below the cap: on a $40,000 loan at 7.5% over 72 months, the first full year's interest is about $2,814. The deduction is available whether you itemize or not, and it is claimed on Schedule 1-A.
The phase-out rounds up
The deduction is reduced by $200 for each $1,000 — or fraction of $1,000 — of modified AGI above $100,000, or $200,000 for joint filers. This rounding is different from the tips and overtime deductions, which round down. If your MAGI is $105,500, the $5,500 excess counts as six thousands and reduces the deduction by $1,200. With $2,800 of interest, the deduction would be $1,600. A household with $10,000 of interest loses the entire deduction once MAGI reaches $50,000 over the threshold. Our phase-out guide compares all four schedules.
Estimating interest before you get a statement
The car loan calculator amortizes a fixed-rate loan and adds up the interest in the payments you make during the tax year. That matters for timing: a loan signed in December may have zero or one payment in its first calendar year, while the second year captures twelve payments with the highest interest share. If you are deciding between buying in December or January, the deduction difference for the first year is usually small, and the vehicle price and rate matter much more.
Is it worth choosing a car for the deduction?
The deduction returns your marginal tax rate on interest you pay. At 22%, every $1,000 of interest saves about $220. You still pay the other $780. A lower interest rate or a cheaper car will almost always save more than the deduction is worth. Treat the deduction as a bonus if the car you already want qualifies, not as a reason to borrow more.
Common situations
Trading in a car with negative equity. If the loan includes an amount rolled over from a previous loan, the old balance was not used to buy the new vehicle, so expect only the portion that financed the qualifying purchase to count; check the final regulations for the allocation method. Co-signed loans. The person who is liable on the loan and actually pays the interest is the one who can claim it. Buying with cash, then borrowing. A loan taken after the purchase that is not used to buy the vehicle does not qualify. Mid-year purchase. Only interest paid during the tax year counts, so a September purchase will typically produce three or four months of interest in the first year. Paying off early. Prepaying principal lowers future interest and therefore future deductions, but it still saves you more in interest than the deduction is worth.
Checklist before you sign
- Confirm the vehicle is new and has never been titled.
- Check final assembly with the label or NHTSA VIN decoder.
- Make sure the loan is secured by the vehicle and is in your name.
- Keep the VIN, contract and lender statements.
- Run your numbers with the calculator, including the phase-out.
This is general education, not tax advice. The final regulations and Schedule 1-A instructions are the authorities.