The short version
For excellent-credit borrowers, PenFed and Navy Federal publish the lowest direct refi APRs. For fair-to-good credit, AutoPay and Caribou shop your application across multiple banks at once and frequently surface offers neither you nor the credit unions could find directly. LightStream is the speed champion for 670+ FICO. RateGenius and Tresl (Auto Approve) round out the field for borrowers who want more options.
1. PenFed Credit Union
Best for: prime credit borrowers who want the lowest direct rate.
Open membership (anyone can join via a small charitable donation), nationwide footprint, and consistently among the lowest published refi APRs in the market.
- APR (from): ~5.49% (excellent credit, current)
- Min credit: 650
- Loan amount: $500 to $150,000
- Vehicle restrictions: 10 model years, no mileage cap
- Fees: None
2. Navy Federal Credit Union
Best for: military/DoD-eligible borrowers.
Industry-leading APRs across credit tiers. Wider eligibility than people realize — extends to immediate family of servicemembers and veterans.
- APR (from): ~5.39% (excellent credit, current)
- Min credit: 640 typical, lower for existing members
- Loan amount: $250 to $500,000
- Vehicle restrictions: lenient — no firm age cap, mileage 100k+ accepted
- Fees: None
3. AutoPay
Best for: borrowers with fair-to-good credit who want one application to reach many lenders.
AutoPay is a refi marketplace — you complete one application, they shop it across their lender network (banks and credit unions), and surface multiple offers. Particularly useful for fair credit (575+ FICO accepted), where rate variance across lenders is widest.
- APR (from): ~5.69% (excellent credit, current)
- Min credit: 575
- Loan amount: $2,500 to $100,000
- Vehicle restrictions: most reasonable; varies by partner lender
- Fees: varies by partner; some have origination fees
4. Caribou
Best for: borrowers with fair-to-good credit who want a fast, polished refi process.
Specialist refinance lender with a clean online application. Soft-pull pre-qualification, fast funding for approved borrowers, GAP/VSC available as add-ons (which we'd skip).
- APR (from): ~5.79% (excellent credit, current)
- Min credit: 630
- Loan amount: $5,000 to $150,000
- Vehicle restrictions: 10 model years, 150,000 miles
- Fees: variable by partner; some none, some up to $399
5. LightStream
Best for: excellent credit borrowers who want speed.
Truist-backed online lender. Same-day funding possible. Rate Beat program will beat any qualifying competitor's offer by 0.10 points. No fees, ever.
- APR (from): ~5.99% (excellent credit, current)
- Min credit: 670
- Loan amount: $5,000 to $100,000
- Vehicle restrictions: none stated — unusual
- Fees: None
6. RateGenius
Best for: borrowers wanting another marketplace option.
Refi marketplace similar to AutoPay. Different partner lender network, so worth checking even if you've pre-qualified at AutoPay — different lenders may have different appetites for your file.
7. Tresl (Auto Approve)
Best for: borrowers with subprime credit looking to refinance.
Online refi lender with willingness to fund near-prime and sub-prime borrowers. Higher APRs than the top of the list, but accessible when others won't fund.
How to choose between these
The shortest decision tree:
- FICO 720+, you're eligible for Navy Federal: Navy Federal first, PenFed second. Don't bother with marketplaces — direct credit-union rates win.
- FICO 720+, not eligible for Navy Federal: PenFed first. LightStream second if you need speed. Skip marketplaces unless you want to verify.
- FICO 660–719: PenFed first. Then AutoPay or Caribou. Compare offers.
- FICO 600–659: AutoPay or Caribou first (marketplace approach widens access). PenFed second if eligible.
- FICO below 600: AutoPay (down to 575 FICO). Tresl as backup.
What to avoid
"No credit check" refinance offers
Doesn't exist with any legitimate auto refi lender. If a company advertises this, they're either misleading you or running a title-loan operation.
Heavy add-on pitches during the application
Some marketplaces (and the partner lenders behind them) push GAP insurance, vehicle service contracts, and credit insurance during the refi process. These products can be useful — but they're typically priced 50–100% above what you'd pay buying directly. Decline during refi; buy elsewhere if you actually want them.
Lenders that won't tell you the APR until you fully apply
Most legitimate lenders will give you an indicative APR via soft-pull pre-qualification. If a lender requires a hard-pull formal application before quoting any rate, walk away. They're hoping you've sunk effort into the application before learning you're getting a bad rate.
Rolling additional debt into the auto refi
Some refi lenders pitch debt consolidation: roll your credit card balance into the auto loan. Mathematically can work (lower APR than cards) but secures previously-unsecured debt against your vehicle. Now your car can be repossessed for credit-card debt. Usually a HELOC or balance transfer card is the better consolidation tool.
Process: how to refi efficiently
- Pre-qualify (soft pull) at 3 lenders. Always include PenFed if you're eligible.
- Compare indicative APRs and any disclosed fees.
- Hard-pull at the top 1–2 lenders within the same week (one inquiry for FICO scoring).
- Verify the new lender will pay off the existing loan directly. Sign documents.
- Continue paying the old lender until you get written confirmation the loan is paid off (typically 5–10 business days). Avoid double-payment by canceling auto-pay only after confirmation.
Frequently asked
What's the difference between a refi marketplace and a direct lender?
Direct lender: PenFed, Navy Federal, LightStream — they hold your loan on their own books. Marketplace: AutoPay, Caribou, RateGenius — they shop your application across many partner lenders. Marketplaces simplify the front end but you don't always know which bank ends up holding your loan.
Are credit unions always cheaper than online lenders?
For excellent credit, yes — typically 0.25–1.0 points cheaper than online lenders. For fair credit, the gap closes. For sub-prime, marketplaces sometimes beat credit unions because they have access to subprime-specialist partner lenders.
Why isn't Bank of America or Chase on this list?
Chase doesn't offer direct refinancing — only purchase loans. Bank of America does, but their refi APRs are typically 1.0–1.5 points above the credit-union options. Worth checking only if you have a Preferred Rewards relationship that drops the rate.
How long does the refi process take?
From application to funding: 3–10 business days at most lenders. Title transfer (where the lien moves from old to new lender) takes another 30–60 days but doesn't affect when you start paying the new lender.