Car Loan Interest Deduction Calculator

For the first time since 1986, ordinary car buyers can deduct auto loan interest on their federal return — with conditions attached to nearly every word. The One Big Beautiful Bill Act allows up to $10,000 a year of interest for tax years 2025 through 2028, but only on a loan originated after December 31, 2024, only for a new vehicle (not used, not leased), only for personal use, and only if the vehicle's final assembly happened in the United States. The deduction also phases out quickly: $200 per $1,000 of modified AGI above $100,000 for single filers or $200,000 filing jointly, which zeroes it out at $150,000 and $250,000 respectively. This calculator estimates your first-year interest from the loan amount, APR, and term, then applies the cap and phase-out to show what you can actually deduct and what it's worth at your bracket — so you can weigh it properly against the price of an import that doesn't qualify.

On a typical $42,000 loan at today's rates, first-year interest runs near $3,000 — worth roughly $650 in federal tax savings at the 22% bracket, fading each year as the balance amortizes. That's meaningful but not decisive, and the qualification rules can flip the answer: a US-assembled vehicle that costs $1,500 more than an import may still win once four years of deductions are counted, while a used car at a better price loses the deduction but might win anyway. Because the phase-out starts at just $100,000 of single-filer income, many buyers who hear about the deduction won't actually receive much of it. Ten minutes of math before you sign beats discovering the fine print at tax time.

Interest paid is what you actually pay the lender during the tax year — highest in year one and declining as the loan amortizes; the calculator estimates it from a standard amortization schedule. Cap the interest at $10,000, then subtract $200 for each $1,000 (or part) of modified AGI above $100,000 (single/head of household) or $200,000 (joint). The tax saved equals the surviving deduction times your marginal bracket. It's above-the-line, so no itemizing is required.

1. Enter the loan amount. The financed amount after your down payment and trade-in — not the sticker price.
2. Enter APR and term. Use the APR from your loan offer, which includes financed fees. Longer terms mean more first-year interest and a larger early deduction — but far more total interest.
3. Add filing status and MAGI. The phase-out is aggressive: it starts at $100,000 (single) / $200,000 (joint) and removes $200 of deduction per $1,000 over.
4. Verify the vehicle qualifies. New (first owner), personal use, under 14,000 lbs GVWR, final assembly in the US, loan originated after 2024, secured by the vehicle. The window sticker or the NHTSA VIN decoder shows the final assembly plant.
5. Check the savings against your options. Compare the four-year deduction stream against the price difference versus a non-qualifying vehicle — the deduction should tip close calls, not drive the whole decision.

• Assuming used cars qualify. Only new vehicles — original use starting with you — are eligible; the used market is excluded entirely.
• Missing the final-assembly test. Brand nationality is irrelevant: some Honda and Toyota models assembled in US plants qualify, while some "American" brand models assembled in Mexico or Canada don't. Check the VIN.
• Counting a lease. Lease payments aren't loan interest; leases don't qualify no matter where the car was built.
• Refinancing traps. Refinancing the original qualifying loan can preserve the deduction (up to the old balance), but a new loan on an already-owned vehicle originated to cash out doesn't create eligibility.
• Expecting the same deduction every year. Interest front-loads: the deduction shrinks annually as your balance falls, so don't project year one across all four years.

• Decode your VIN at the NHTSA site before signing — final assembly location is stated explicitly, and dealers are required to show it on the Monroney window sticker.
• If you're near the $100,000/$200,000 MAGI line, pre-tax 401(k) contributions can restore $200 of deduction per $1,000 of income moved.
• A larger down payment cuts interest and total cost; don't stretch the term just to inflate a deduction worth 22–24 cents per interest dollar.
• Lenders report the interest on a new information return — keep it with your records and make sure the loan is secured by the vehicle, a formal requirement.
• The deduction stacks with the standard deduction, so it's usable by the vast majority of buyers who don't itemize.

This deduction rewards a specific buyer: moderate income, new US-assembled vehicle, financed after 2024. Fit that profile and it returns $500–$1,500 a year at first, tapering with your balance through 2028. Fall outside it — used car, lease, import, or income past the phase-out — and it returns nothing. Run your actual loan numbers, verify assembly by VIN, and let the result inform the deal rather than justify it.

• Loan Calculator — see your full payment and amortization schedule
• No Tax on Overtime Calculator — another OBBBA deduction you may qualify for
• SALT Deduction Calculator — the 2026 state and local tax cap
• Debt Payoff Calculator — plan paying the loan off early

• NHTSA — VIN decoder (nhtsa.gov) — Verify final assembly location by VIN
• IRS — OBBBA individual deductions (irs.gov) — Official guidance on the car loan interest deduction