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Why is the rate what it is, and who actually decides?

Short answer: a bank decides, not the dealership. Here is the whole picture, including the part most people never get told.

The lender sets the rate, not the sales floor

When you finance at a dealership, the dealership does not lend you the money. It takes your application and sends it to lenders. Each lender that approves you sends back the rate it is willing to buy your loan at. That number is called the buy rate, and it comes off that lender's own pricing grid. Nobody on the sales floor picks it.

Where the dealership does come in

The honest version: the dealership is allowed to add an amount on top of the buy rate as its compensation for arranging the financing. It is called dealer participation or reserve, it is legal, and it is how most dealership financing has always worked. The lender's contract with the dealership caps how much can be added. That cap is set by the lender, not by law, so it is different at every lender.

Two things follow from that, and I would rather you hear them from me. You can ask what the buy rate is. And the rate is negotiable, the same way the price is. The federal consumer bureau says so plainly: dealers and lenders are not required to offer you the best rate they have.

Loan to value: the part nobody explains

LTV is the biggest reason two people with similar credit walk out with completely different answers. It is one division problem:

LTV = what you are financing ÷ what the bank says the car is worth

The denominator is not the sticker price. Lenders underwrite against a book value, usually J.D. Power (formerly NADA) or Black Book, and that number is normally lower than the retail price on the window.

The numerator is everything you finance, not just the car: the vehicle, South Carolina's IMF fee, tag and title if you roll them in, whatever you still owe on your trade beyond what it is worth, and often a service contract or GAP.

Every lender sets its own ceiling on that percentage and none of them publish it. Once you are over the ceiling, the answer is not a worse rate, it is a restructure: money down, a different car, or a different lender. This is also the single most common reason a deal someone thought was done comes back the next day.

What the lender is actually weighing

Roughly in order of how much it moves the number. No lender publishes exact weights, so treat this as direction, not math:

1. Your credit tier. Far and away the biggest factor. See the spread below.
2. The car itself. Used prices higher than new at every tier, and an older, higher-mileage car has a smaller pool of lenders willing to touch it, which pushes the rate up.
3. LTV and down payment. Often decides whether there is an approval at all, before rate is even a question.
4. The term. Longer terms usually carry a rate add on top of everything else.
5. Income against the payment. Matters enormously in the lower tiers, barely at all in the top ones.
6. Time on the job and at your address. A subprime consideration. Mostly irrelevant if your credit is strong.
7. Which lender it lands at. Credit unions have been pricing meaningfully below banks and finance companies.

What the spread actually looks like

Average APR on a used vehicle, by credit tier. This is Experian's Q1 2026 data, the most recent tier breakdown published:

That is a 15 point spread on the exact same cars. It is also why the 12.99% this site uses to sort inventory is a middle-of-the-road assumption rather than a promise: it is close to what a mid-tier buyer actually sees, so the payments on these pages do not under-promise.

One catch worth knowing. Experian reports on VantageScore 4.0 bands. Most auto lenders pull a FICO Auto Score, which runs on a 250 to 900 scale and weighs your auto history more heavily. The score in your banking app is often not the score the lender sees, and it can land you in a different row than the one you expected.

Why the payment moves even when the price does not

Five things, and only one of them is the rate: the term (72 months against 60 on the same loan changes the payment noticeably and the total interest a lot more), the APR, whether the IMF fee and tag and title are financed or paid up front, your down payment, and any negative equity coming across from the trade.

What actually helps you

• Cash down. The only lever that moves the approval and the rate at the same time, because it lowers the amount financed and the LTV together.
• Pay the fees up front. Tag, title and the IMF fee out of pocket instead of financed keeps them out of the numerator.
• A shorter term, if the payment still works for you.
• Clear the negative equity on your trade if you are in a position to.
• Get pre-approved at your own credit union first, then let me try to beat it. Prequalifying is usually a soft pull that does not touch your score. A real application is a hard pull, so do all of your auto rate shopping inside 14 days and every scoring model counts it as a single inquiry.
• Ask for the buy rate. Anywhere. Including here.

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Sources, checked September 2026

• Consumer Financial Protection Bureau, "What is a buy rate for an auto loan?"
• Consumer Financial Protection Bureau, "Can I negotiate the interest rate on an auto loan with the dealer?"
• Experian, average car loan interest rates by credit score (Q1 2026 data)
• myFICO, how long hard inquiries stay on your credit report and how rate shopping is grouped
• NADA Fair Credit Compliance Policy & Program (voluntary dealer guidance)