The dealership makes more money on your financing than on the car itself. That's not an exaggeration — F&I (finance and insurance) is where dealers have the highest margins. The car price negotiation is theater. The real money is in what happens after you agree on the price.
Here's how to walk in knowing exactly what you should pay.
How Auto Loan Rates Work
Rates depend on credit score, loan term, vehicle age, and lender. In 2026:
| Credit score | New car APR (avg) | Used car APR (avg) |
|---|---|---|
| 750+ | 5.5–6.5% | 6.5–7.5% |
| 700–749 | 7–8.5% | 8.5–10% |
| 650–699 | 10–13% | 12–16% |
| Below 650 | 15–20%+ | 18–25%+ |
A 100-point credit score difference on a $30,000 loan can mean $3,000+ in extra interest over 5 years.
The Total Cost Math
People focus on monthly payments. Dealers love this. The monthly payment hides the real cost.
$30,000 car, different terms at 7% APR:
| Term | Monthly payment | Total paid | Total interest |
|---|---|---|---|
| 36 months | $927 | $33,372 | $3,372 |
| 48 months | $718 | $34,464 | $4,464 |
| 60 months | $594 | $35,640 | $5,640 |
| 72 months | $511 | $36,792 | $6,792 |
| 84 months | $452 | $37,968 | $7,968 |
The 84-month loan payment is $475 less per month than the 36-month. It also costs $4,596 more in interest. Dealers push longer terms because lower monthly payments close deals.
Dealer Financing vs Getting Your Own Loan
Before you go to the dealership:
- Check your credit score
- Get pre-approved at your bank or credit union
- Compare that rate with online lenders (PenFed, LightStream, Capital One Auto)
Your pre-approval is a negotiating tool. If the dealer can beat your rate, great. If not, you already have financing.
Why credit unions often win: Credit unions typically offer 0.5–1% lower rates than banks on auto loans. If you're not a member of one, join before you shop.
The "0% Financing" Trap
0% APR deals exist, but:
- Usually require excellent credit (750+)
- Often you forfeit a cash rebate to get 0% (the rebate usually beats 0% financing)
- Shorter terms required (often 24–36 months, higher monthly payments)
Example: $28,000 car. Dealer offers $3,000 rebate OR 0% for 60 months.
- Take rebate ($25,000 at 6%): $483/month, total paid $28,980
- Take 0% ($28,000): $467/month, total paid $28,000
- 0% wins by $980
But if you took the rebate and paid it off in 36 months: $759/month, total paid $27,324 — beats both. The math favors 0% mainly when you stretch the term.
New vs Used: The Depreciation Reality
A new car loses 20–30% of its value in the first year. Buying a 2–3 year old certified pre-owned vehicle means someone else absorbed that depreciation.
If you're financing: A used car at 7% vs a new car at 5% can still favor the used car because the principal is lower.
How to Buy a Car Without Getting Played
- Get pre-approved before visiting — know your rate ceiling
- Negotiate price, not payment — agree on purchase price first, financing second
- Check the out-the-door price — includes taxes, fees, dealer markups
- Decline add-ons at signing — extended warranties, GAP insurance (buy GAP separately, it's cheaper), paint protection
- Read every number on the contract — dealers are skilled at hiding fees in paperwork
GAP Insurance: Actually Worth It Sometimes
If you put less than 20% down or are financing for 60+ months, your loan balance can exceed the car's value. If totaled, your insurance pays market value — not what you owe.
GAP insurance covers that difference. Through a dealer: $300–800. Through your insurance company: $20–40/year. Always buy through your insurer.
The Bottom Line
- Get pre-approved at a credit union or bank before stepping on a lot
- Negotiate the purchase price, then deal with financing
- 36–48 month terms cost significantly less in total interest than 60–84
- The monthly payment is the least useful number — look at total cost
- Dealer financing, extended warranties, and add-ons are where the real margin is
Use our Loan Calculator to see the total cost of any car loan at any rate and term before you commit.
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