The Car Loan Interest Deduction: The Tests Your Vehicle Has to Pass

Of the four deductions on Schedule 1-A, car loan interest is the one where eligibility is decided by the car rather than by you. Your income affects how much of it survives. Whether you get any of it at all is settled by where the vehicle was assembled, what it weighs, whether anyone owned it before you, and when you signed the loan.

Most of those are unfixable after the fact, which makes this a deduction worth understanding before the next purchase rather than in April.

The vehicle tests

The IRS describes a qualifying vehicle as "a car, minivan, van, SUV, pick-up truck or motorcycle, with a gross vehicle weight rating of less than 14,000 pounds, and that has undergone final assembly in the United States."

Three things there are easy to get wrong.

Final assembly in the United States is about the plant, not the badge. A domestic nameplate assembled abroad does not qualify. An import brand assembled in a US plant does. The badge on the grille tells you nothing useful.

Motorcycles are in. They are named explicitly, which surprises people who assumed this was a car programme.

The weight test is a ceiling, not a floor. Under 14,000 pounds GVWR covers essentially every passenger vehicle and most pickups, but it is a real limit at the top of the heavy-duty range.

The ownership test: new only

The original use of the vehicle has to start with you. In the IRS's words, "a used vehicle does not qualify."

There is no partial credit here and no exception for a nearly-new vehicle, a demonstrator with delivery miles, or a lease buyout of a car you have been driving for three years. If someone else was the first user, the interest is not deductible.

The loan tests

The debt has to be incurred after December 31, 2024, for the purchase of the vehicle, and it has to be secured by a first lien on it. Purchase for personal use is required — a vehicle bought for business is a different set of rules, and Schedule 1-A has a column for backing out interest already deducted on Schedule C, E or F.

A first lien means an unsecured personal loan used to buy a car does not qualify, and neither does a home equity draw. The lien is what makes it a qualified passenger vehicle loan rather than an ordinary consumer debt.

Proposed regulations issued in January 2026 address further details, including what is and is not part of the financed amount. Those are proposed rather than final, so treat the specifics as provisional and check the final rules before relying on an edge case.

Form 1098-VLI, and why 2026 looks different from 2025

Lenders that receive $600 or more of interest from an individual on a qualified passenger vehicle loan during a calendar year fall inside the new reporting requirement.

For 2025, Notice 2025-57 gave lenders a transition path. The IRS said it "will consider that lenders have met their reporting obligations for interest received on a qualified passenger car loan in 2025 if they make a statement available to the buyer indicating the total amount of interest received" — through "an online portal that the buyer can easily access; in a regular monthly statement; on an annual statement that is provided to the buyer; or by other similar means."

That is why 2025 was a year of ad-hoc letters and portal figures rather than a form. From 2026, the reporting runs through Form 1098-VLI, Vehicle Loan Interest Statement, furnished to borrowers by January 31 following the year — which for 2026 interest means February 1, 2027, since January 31 falls on a Sunday.

One structural detail worth knowing: the $600 test applies separately to each loan. Two vehicles, each generating $450 of interest, produce no forms even though you paid $900 — and the interest is still deductible if the vehicles and loans qualify. As with the raised 1099 thresholds, the arrival of a form is not the test for whether something belongs on your return.

Schedule 1-A Part IV wants the VIN

This is the practical difference between this deduction and the other three. Part IV asks you to list the vehicle identification number of each applicable vehicle, alongside two interest columns: the amount deducted on Schedule C, E or F, and the amount going to Schedule 1-A. Two VIN rows are provided; more than two vehicles sends you to the instructions.

The VIN is also how the assembly-location test becomes checkable. It is worth having the window sticker or the manufacturer's build data with your tax records, not just the loan statement.

The phaseout is the steepest of the four — and it rounds the other way

The cap is $10,000 of interest per return. The phaseout starts at $100,000 of modified AGI ($200,000 on a joint return) — the lowest starting point of any of the four deductions except the senior deduction — and it removes $200 for every $1,000 of excess, twice the rate that applies to tips and overtime.

And the rounding runs the opposite direction. Schedule 1-A line 28 says that if the excess divided by $1,000 "isn't a whole number, increase the result to the next higher whole number. (For example, increase 1.5 to 2, and increase 0.05 to 1.)" The statute uses the phrase "or portion thereof," which the tips and overtime provisions do not.

Practically: $1 of modified AGI over $100,000 costs $200 of deduction. In Parts II and III, the first $999 over the threshold costs nothing. Do not carry an intuition from one part to the other.

A $10,000 deduction is fully consumed by 50 steps, so it reaches zero at $150,000 of MAGI for a single filer and $250,000 on a joint return.

Unlike tips, overtime and the senior deduction, Part IV imposes no joint-return condition on its face — worth noting if you are married filing separately and shut out of the other three.

The deduction runs for tax years beginning after December 31, 2024 and before January 1, 2029, and is available whether you take the standard deduction or itemize.

Checklist before you sign, and before you file

1. Confirm final assembly in the United States from the window sticker or build data — not from the brand.
2. Confirm the vehicle is new to you. Used, including a lease buyout, does not qualify.
3. Confirm the loan is secured by a first lien and was incurred after December 31, 2024.
4. Keep the VIN with your tax records. Part IV asks for it by line.
5. Check your modified AGI against $100,000 / $200,000 before you count on anything. This phaseout starts early, runs at double rate, and rounds up.
6. Do not wait for a form. Under $600 of interest on a loan produces no Form 1098-VLI, and the interest may still be deductible.

Our free guide to what is new on 2026 tax forms covers Form 1098-VLI alongside the other forms that changed this year, and the Schedule 1-A estimator stacks the car loan deduction against the other three so you can see which phaseout bites first. If you are anywhere near a threshold, the rounding rules are the thing to read next.

Estimates and general information, not tax advice. Confirm your specific situation with a tax professional.