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The short answer
A bank or credit union preapproval gives you a rate before you walk into the dealership, creating a useful negotiating baseline. Dealer financing may include a markup over a lender's buy rate, but a dealer's lender network or manufacturer-subsidized 0% or low-APR offer can also beat a preapproval. Compare both offers using the same vehicle price, amount financed, term, fees, add-ons, and any rebate you would give up — then choose the lower total cost.
How dealer financing actually works
- You fill out a credit application at the dealership.
- The finance manager sends it to multiple lenders (banks, credit unions, captive finance companies).
- Lenders return a buy rate — the actual rate you qualify for.
- The dealer presents you a contract rate — the buy rate plus a markup (typically 1–2 points, sometimes more on subprime).
- The dealer keeps the markup spread as profit.
You never see the buy rate. That's the structural disadvantage.
The preapproval advantage
- Known rate upfront. You walk in knowing exactly what you qualify for — no surprises in the finance office.
- Negotiating leverage. "I have 5.49% from my credit union" forces the dealer to beat it or lose the financing profit.
- No markup. Credit unions especially tend to offer their published rate with no dealer spread.
- Time pressure removed. The finance office is designed for quick decisions; a preapproval lets you say no and walk away.
Our published auto-loan tables show current bank and credit union rates — credit unions consistently post the lowest numbers.
When dealer financing wins
- 0% or 0.9% manufacturer offers. No bank beats free money. But calculate the tradeoff: these offers usually require giving up a cash rebate ($1,000–$3,000). On a $30,000 car, 0% APR with no rebate vs. 5.49% with a $2,500 rebate — run both scenarios.
- Subprime borrowers. If your credit is challenged, the dealer's lender network may find approvals your bank won't offer — but scrutinize the rate and term.
- Same-day convenience. Only a tiebreaker, never a reason to accept a worse rate.
How to compare: total cost, not monthly payment
Dealers love selling on monthly payment because extending the term lowers the payment while raising total cost. Always compare:
| Preapproval | Dealer offer | |
|---|---|---|
| APR | ___% | ___% |
| Term (months) | ___ | ___ |
| Amount financed | $___ | $___ (watch for add-ons!) |
| Total interest paid | $___ | $___ |
| Add-ons (extended warranty, GAP, etc.) | None | $___ |
Add-ons are the hidden cost. Dealer financing often bundles extended warranties, GAP insurance, paint protection, and other products into the financed amount. Each one raises your total cost. Decline them or price them separately.
The math: a real example
$32,000 car, 60 months:
- Credit union preapproval at 5.49%: $610/month, $4,624 total interest
- Dealer financing at 7.49% (2-point markup): $640/month, $6,424 total interest
- Difference: $1,800 — for the convenience of signing in the finance office
Common mistakes
- Negotiating monthly payment instead of total cost. A $30/month lower payment over 84 months instead of 60 costs you thousands more.
- Accepting add-ons under pressure. Every add-on can be bought separately, usually cheaper.
- Skipping the rebate-vs-rate math. Always calculate: (promotional rate, no rebate) vs. (bank rate, with rebate).
- Not getting the preapproval first. Even if you end up using dealer financing, the preapproval is your ceiling — never pay more than your bank offered.
Methodology and limitations
Rate examples are illustrative based on October 2026 published auto-loan data. Your actual rate depends on credit score, loan term, vehicle age, and down payment. Dealer markup practices vary by state law — some states cap the markup. Verify current published rates in our tables before shopping.
Reviewed by the LoanMate.ai editorial team.
Primary sources
- Consumer Financial Protection Bureau (CFPB): auto loan shopping guidance
- Federal Reserve: auto loan rate data (G.19 statistical release)
Next action
See today's published auto-loan rates → and get preapproved before you visit the dealer. When you have the dealer's offer, compare total cost — not just the monthly payment.