In short: the deduction applies to tax years 2025 through 2028. You claim the interest you paid during a given year on the tax return you file the following spring — so interest paid in 2025 goes on the return you file in early 2026, and so on through the 2028 tax year filed in early 2029.
It's a temporary provision with a hard window. Knowing exactly which year your interest lands in — and when the window closes — is the difference between capturing the deduction and missing it.
The window: 2025 through 2028
The One Big Beautiful Bill Act created this deduction for four tax years: 2025, 2026, 2027, and 2028. You deduct the qualifying interest you actually paid in each of those calendar years, on that year's return. There's no lump-sum, one-time claim — it's year by year, for as long as you're paying qualifying interest inside the window and meeting the tests.
Which return does my interest go on?
You claim interest in the tax year you paid it, on the return filed the next spring:
- Interest paid in 2025 → the return you file in early 2026.
- Interest paid in 2026 → filed in early 2027.
- Interest paid in 2027 → filed in early 2028.
- Interest paid in 2028 → filed in early 2029 (the last year this deduction is available).
Each year you re-check the same tests: the vehicle still has to have qualified when you bought it (new, personal use, US-assembled, loan taken in the window), and your income that year has to be under the phase-out .
When your loan has to have started
The deduction is tied to loans taken in the 2025–2028 window. A loan you originated before 2025 generally doesn't bring earlier interest into this deduction. If you're weighing whether an existing loan qualifies — or whether refinancing changes anything — see the refinance guide ; refinancing a qualifying loan doesn't reset your eligibility.
What if you already filed and missed it?
If you filed a return for a year in the window and didn't claim interest you were entitled to, you generally have the normal amendment window to fix it. Gather your interest total and VIN confirmation and talk to a tax professional about amending — don't leave a qualifying deduction on the table just because the original return is already in.
Frequently asked questions
Is the car loan interest deduction permanent?
No. It's a temporary provision covering tax years 2025 through 2028. Unless the law is extended, interest paid after 2028 would not qualify.
Can I claim interest I paid in 2024?
No. The window starts with the 2025 tax year, so interest paid in 2024 falls outside it, even on a car you still own.
Do I claim four years of interest all at once?
No. You claim each year's qualifying interest on that year's return — four separate filings across the life of the deduction, each with its own income check.
I bought a qualifying car in 2025 but forgot to claim the interest. Can I still get it?
Likely yes, by amending that year's return within the normal amendment window. Bring your interest total and VIN result to a tax professional to file the amendment correctly.
This is general information, not tax advice. Deadlines and amendment windows have specifics — confirm your dates with the IRS or a tax professional. Figures reflect the OBBBA car loan interest deduction for tax years 2025-2028.
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