Should you finance through the dealership?
Sometimes. Usually only if you've shopped an outside rate first and used it as leverage. Here's how dealer financing actually works and when it beats a bank.
How dealer financing actually works
The dealer doesn't set your rate. Their finance office submits your application to a network of banks, gets back a 'buy rate,' and then marks it up. That markup — often 1-3 percentage points — is a big chunk of the finance office's profit.
So a 'competitive rate' offered by the dealer usually isn't. It's the bank's rate plus a spread you didn't see.
When dealer financing does win
Manufacturer-subsidized rates (like 0.9% or 2.9% APR on specific models) come directly from the automaker's captive lender. These are real and often unbeatable by a credit union — but they usually come at the cost of a rebate you'd otherwise get in cash.
Always do the math: total interest paid on the subsidized rate vs. total interest at your credit union rate minus the cash rebate. One of the two is meaningfully better; work it out.
How to shop your own rate first
Get pre-approved by your primary bank or credit union before you set foot in a dealership. Ideally add one online lender too. Bring the approval letter with the rate and term in writing.
That letter is your ceiling. The dealer only wins your financing business if they beat it.
Negotiating the rate the dealer offers
Ask, in the finance office: 'What's your buy rate on this deal, and how much of the spread are you willing to take off?' Most finance managers will move 0.5-1% if pushed. If they refuse, keep the outside financing.
One more trap: never let the dealer extend the term to hit a target monthly payment. A lower payment over 84 months usually costs thousands more in interest than a slightly higher one over 60.
Ready for help on your deal?