What Is the Dealer's Rate Really Costing You?

How Dealer Reserve Works

When a dealer arranges your financing, the lender sends back a buy rate — the minimum rate it will accept for your credit profile. Under the dealer's agreement with that lender, the dealer may add a markup, commonly capped at 2 to 2.5 percentage points, and present the result to you as "your rate." The spread is called dealer reserve, and the dealer keeps a share of it.

You never see the buy rate. It appears on no document you're given, and there's no obligation to disclose that a markup was applied at all.

How common is it? A 2023 MIT analysis cited by NerdWallet found roughly 78% of dealer-arranged loans carried a marked-up rate, averaging 1.13 percentage points. Earlier work by the Center for Responsible Lending put the average higher at 2.47 points, and found used-car loans marked up far harder than new: around 2.91 points versus 1.01.

What a Markup Actually Costs

On a $32,000 loan, here's the extra interest by markup size and term:

Two points on a five-year loan is about $30 a month — small enough to disappear into a payment discussion, which is precisely why the conversation at the dealership is steered toward monthly payment rather than rate. Longer terms make markups worse, because you're paying the inflated rate on a slowly shrinking balance for longer.

When the Dealer Genuinely Beats Your Pre-Approval

Worth saying plainly, because most articles on this topic won't: dealer financing isn't automatically the worse deal, and a pre-approval isn't a rule that you must use it.

• Manufacturer promotional rates. Captive lenders — Toyota Financial, Ford Credit, and the rest — offer subsidised rates like 0%, 1.9% or 2.9% on specific models. These are marketing spend, not marked-up money, and no credit union will beat 0%.
• The dealer shops more lenders than you did. A dealer may submit your application to a dozen lenders; you probably applied to one or two.
• Relationship pricing on your particular profile. Some lenders price thin-file or subprime borrowers better than a credit union will.

The pre-approval's value isn't that you have to use it. It's that it gives you a number the dealer has to beat, which is the only reliable way to find out whether you were being marked up.

The 0% vs Rebate Trap

Promotional financing usually requires forfeiting a cash rebate, and the two aren't interchangeable. On a $32,000 loan over 60 months, 0% APR costs you $32,000 total. Taking a $2,500 rebate and financing $29,500 at 6.9% costs about $34,965 — so the 0% offer wins by roughly $2,965 here.

That flips when the rebate is large or the alternative rate is low. The calculator above accounts for a forfeited rebate if you enter one; our 0% APR vs rebate calculator handles that comparison in more depth.

How to Use This at the Dealership

1. Get pre-approved before you go. A credit union or your own bank, a few days ahead. This is the whole mechanism — without a competing number you have no way to detect a markup.
2. Negotiate the vehicle price first, completely separately from financing. Mixing them lets a dealer give ground on one and take it back on the other.
3. Then say you have financing arranged and ask them to beat it. Often they can, because the buy rate was lower than what they first quoted.
4. Compare the rate, not the payment. A lower payment on a longer term is not a better deal.
5. If they beat it, take the dealer's loan. That's the pre-approval doing its job.

And if you've already signed at a marked-up rate, refinancing is usually available after a few payments — the markup isn't permanent.