Auto loan refinance
The biggest single value-lever in auto financing isn't buying used or paying down faster — it's refinancing out of a subprime dealer rate into a prime credit-union rate once your score recovers. A 14% → 8% APR reduction on a $20k balance saves thousands in interest over the remaining term. This calculator gives you the exact dollar figure, the break-even on any fees, and surfaces whether stretching the term actually costs you more lifetime.
Last updated 2026-05-13
- Finish current loan
- $5,827
- Refinance (incl. closing)
- $3,396
- Lifetime delta
- −$2,431
MethodologyWhen auto refi is a real win (and when it isn't)
When auto refi is a real win (and when it isn't)
The subprime-to-prime arc:if you bought through a dealership while rebuilding credit (or being a first-time buyer), your original APR likely came from the dealer's captive finance arm or a subprime lender — often 12-18%. After 12-24 months of on-time payments, your score has likely improved enough to qualify for a 6-9% rate from a credit union. The APR delta on the remaining balance is the refi's value driver, and it's often 5-10 percentage points.
The math we run: standard amortization on both loans. New monthly = amortize(remaining balance + closing costs if rolled, new APR, new term). Break-even = closing-costs ÷ monthly savings. Lifetime-interest delta = (new-loan total interest + closing cash) − (current-loan remaining interest). Negative delta means the refi saves lifetime; positive means it costs more.
Closing costs are usually low for auto refi:credit unions often waive fees entirely. Banks may charge $100-$300. State DMV title-transfer / re-titling adds $25-$100 depending on jurisdiction. Watch for "loan origination fees" that exceed $300 — at that level the fee starts eating the savings.
The term-extension trap:a tempting refi structure is same balance, lower rate, BUT longer term — drops the monthly hard. The lifetime-interest line in the result panel catches this. If the "new term" you're offered is longer than your remaining current term, you're likely trading lifetime cost for monthly relief. Sometimes that's the right call (cash-flow constraint); often it isn't.
The credit-pull cost: shopping 2-3 lenders within a 14-day window typically counts as a single hard inquiry on your credit report (FICO and VantageScore both use de-duplication windows). Get multiple offers before committing. Pre-qualification flows at most credit unions are soft-pull only — even safer.
Vehicle-eligibility limits:most refi lenders cap by vehicle age (typically 10 years old or newer at maturity), mileage (often 100k-150k cap), and LTV (loan balance ÷ KBB value — usually must be ≤ 110%). If you're underwater (LTV > 100%) and the lender rejects, focus on principal paydown first, then refi.
Cash-out auto refiexists (borrow more than payoff, take the difference as cash) but rarely makes financial sense — you're converting tax-disadvantaged auto debt into more of the same. Better paths for cash needs: home equity (lower rate), 0% balance-transfer card, or just budgeting harder.
If you're still in months 1-12:credit-score improvements from on-time auto payments take 6-12 months to show up meaningfully. The refi opportunity gets larger the longer you've been paying. Set a calendar reminder for month 12 and 24 to re-check your score and the going-rate environment.