Used Car Loan Interest Tax Deduction Calculator
Enter the interest figure from your annual loan statement. The estimate applies the same Schedule 1-A math as your federal return — no tax software, no signup.
The short answer: Maria — at the scenario numbers pre-loaded below, the OBBBA deduction is $1,600, worth about $192 in federal income tax at a 12% marginal rate ($7 per biweekly paycheck). Exact figures update live as you change the inputs.
New, US-assembled vehicle only
Modified Adjusted Gross Income
Car Loan Interest Deduction
$1,600
✅ You qualify for the full deduction
⚠️ This calculator provides estimates for informational and educational purposes only. It is not tax advice. Results are based on the One Big Beautiful Bill Act (OBBBA) and IRS Schedule 1-A. Consult a qualified tax professional for your specific situation.
Qualification Rules That Decide It
Used loans can qualify — the vehicle test is US final assembly, and original purchase date of the car is not your problem; the loan's signing date after enactment is. The catch: the loan must be the original loan on the vehicle — refinancing a pre-enactment loan or assumption of the seller's financing generally breaks qualification. Private-party loans through a bank work if secured by the vehicle.
The full rules, caps and phase-outs for every deduction are in one table on the OBBBA rules page.
Worked Example
Maria financed a three-year-old US-assembled sedan and pays about $1,600 a year in interest.
- • Deductible amount: $1,600
- • Federal income tax savings: $192 (at the 12% marginal rate)
- • Per biweekly paycheck: $7
That repeats every year of the loan — interest deducts annually, which is why the loan-vs-lease math changed under OBBBA.
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Frequently Asked Questions
Does the OBBBA deduction cover used car loans?
Yes, for qualifying US-assembled vehicles, if your loan was signed after enactment and is secured by the vehicle. A refinance of a loan signed before enactment does not revive the deduction.
Do I need to itemize deductions to claim the car loan interest deduction?
No. Like the other OBBBA deductions, vehicle loan interest is an above-the-line adjustment on Schedule 1-A — it stacks on top of the standard deduction.