How the car loan interest deduction works
From 2025 through 2028 you can deduct up to $10,000 a year of interest on a loan for a new car, SUV, pickup, van, minivan or motorcycle. The vehicle must have had its final assembly in the United States. You don't need to itemize. Most of the rules are about the loan and how you use the car. Three of them are about the vehicle, and your VIN can answer those three.
What this checker does
When you press Check my car, your browser sends the VIN to the free VIN decoder run by the National Highway Traffic Safety Administration (NHTSA), the lookup the Treasury and the IRS name in the final regulations. It reads back three fields and applies the rules:
- Plant of manufacture. The rule lets you rely on "the vehicle's plant of manufacture as reported in the VIN." A plant in the United States passes. Anywhere else fails.
- Gross vehicle weight rating (GVWR). It must be less than 14,000 lb. The lookup gives a weight class, not an exact number, so a Class 3 truck (10,001–14,000 lb) needs one more look at the door-jamb label.
- Vehicle type. Car, minivan, van, SUV, pickup or motorcycle. We map NHTSA's body type to these six. Anything unclear is marked for review, never passed.
Then you answer the questions a VIN can't settle. The calculator applies the $10,000 cap, the income phase-out and the refinancing and negative-equity rules. Your answers and numbers stay in your browser.
The rules, with their source
Everything here comes from the final regulations, T.D. 10054, published in the Federal Register on 8 September 2026 (26 CFR §1.163-16), checked 29 September 2026.
| Test | Rule | Section |
|---|---|---|
| Built in the US | Final assembly in the United States; you may rely on the plant in the VIN or the window-sticker final assembly point | §1.163-16(e)(3) |
| Weight | GVWR less than 14,000 lb | §1.163-16(e)(1)(vi) |
| New | Original use starts with you; the loan papers treat it as new | §1.163-16(e)(2) |
| Personal use | You expected more than 50% personal use when you took the loan | §1.163-16(f) |
| Loan | Taken after 31 Dec 2024, secured by a first lien on the car, not a lease, not from a related party | §1.163-16(c), (d) |
| Cap | $10,000 per return, whatever your filing status | §1.163-16(h)(1) |
| Phase-out | Minus $200 for each $1,000 (or part of $1,000) of modified AGI over $100,000 ($200,000 joint) | §1.163-16(h)(2) |
| VIN on return | You must report the VIN on your tax return | §1.163-16(c)(5) |
What counts as part of the loan. The price, sales tax, title and registration fees, warranties, service plans, GAP and credit insurance all count. Negative equity from a trade-in, a trailer, ordinary car insurance and cash back do not. Your down payment is applied to those non-qualifying amounts first, and interest is split pro rata.
What this checker can't tell you
- The VIN can't prove the car was new to you, how you use it, or how the loan is secured. Those answers are yours.
- NHTSA's data comes from the manufacturers. If the lookup has no plant, the regulations let you use the final assembly point on the window sticker instead.
- The interest estimate uses a standard monthly schedule. Your lender accrues interest daily, so use the Form 1098-VLI figure when you have it.
- This is an estimate, not tax advice. The IRS, or your tax preparer applying the rules to your full return, gives the binding answer.
The first-character trap. Some sites say a VIN starting with 1, 4 or 5 means "made in the USA". That character only shows the region the maker's code belongs to. The rule uses the plant. We found the same model built in two countries (Tucson, Civic, Silverado, RAV4), so we always read the plant.
Heavy-duty pickups. Many heavy-duty pickups, including every 2026 Ford F-450 pickup according to Ford's own spec sheet, are rated at exactly 14,000 lb. That is not less than 14,000, so they don't qualify. The VIN lookup only says "Class 3: 10,001–14,000 lb", so we ask for the label figure.
Worked example
A single filer with a modified AGI of $112,400 buys a new Chevrolet Tahoe built in Arlington, Texas (Class 2F, 7,001–8,000 lb). The price with tax and fees is $68,000. The trade-in carries $3,000 of negative equity, and the buyer puts $2,000 down, so the loan is $69,000.
- The $2,000 down payment is applied to the $3,000 negative equity first. That leaves $1,000 of the loan that doesn't qualify, so $68,000 of $69,000 does.
- The Form 1098-VLI shows $4,140 of interest for the year. $4,140 × 68,000 ÷ 69,000 = $4,080 of qualifying interest, under the $10,000 cap.
- Income is $12,400 over $100,000. That's 13 started blocks of $1,000, and 13 × $200 = $2,600 of phase-out.
- Deduction: $4,080 − $2,600 = $1,480.
Section 179 and the "over 6,000 lb" rule
Business buyers ask a different question about the same number. A vehicle rated at 6,000 lb or less is a "passenger automobile" under 26 U.S.C. §280F(d)(5), with yearly depreciation caps. Heavier SUVs, pickups and vans escape those caps. Section 179 still limits heavy SUVs to $31,300 (2025) or $32,000 (2026) under §179(b)(5). Pickups with a bed of at least 6 feet inside, and some cargo vans, are outside that cap. The weight classes in the VIN lookup line up with 6,000 lb exactly, so the checker answers this too. Section 179 needs more than 50% business use, the opposite of the car loan deduction.
Frequently asked questions
Does the first character of the VIN tell me if my car was built in the USA?
No. The first character shows the region of the maker's code. The deduction uses the plant of manufacture reported in the VIN, which the NHTSA lookup returns separately.
My truck's weight rating is exactly 14,000 lb. Does it qualify?
No. The vehicle must have a gross vehicle weight rating of less than 14,000 pounds. A 14,000 lb truck, such as many heavy-duty pickups, does not qualify.
Do used cars qualify for the car loan interest deduction?
No. The original use of the vehicle has to start with you, and your loan papers have to treat it as a new vehicle.
Can I take the deduction if I don't itemize?
Yes. The deduction is allowed whether you itemize or take the standard deduction.
Where do I find how much interest I paid?
On Form 1098-VLI. Lenders that receive $600 or more of interest must send it by January 31 of the following year. Otherwise use your loan statements.
What happens if I refinance my car loan?
The new loan still qualifies if it is secured by the same car, but only up to the balance of the old loan on the day you refinanced. Interest on any cash-out part does not count.
Which tax years does the deduction cover?
Tax years 2025 through 2028, for loans taken out after December 31, 2024.
Can I use Section 179 and the car loan interest deduction on the same vehicle?
Not in the same way at the same time. The car loan deduction needs more than 50% personal use; Section 179 on a vehicle needs more than 50% business use.
Sources
- Car Loan Interest Deduction, final regulations, T.D. 10054, 91 FR 57214 (8 Sep 2026), checked 29 September 2026
- NHTSA vPIC VIN decoder API, checked 29 September 2026
- 26 U.S.C. §280F and §179, checked 29 September 2026
- Rev. Proc. 2024-40 and Rev. Proc. 2025-32 (SUV cap amounts), checked 29 September 2026