One of the most common questions car buyers have is whether to finance through the dealership or come in pre-approved from their own bank or credit union. The honest answer: it depends — and knowing when each option wins can save you thousands.
When you finance through a dealer, they're not lending you money directly. They submit your application to multiple lenders — banks, credit unions, and captive finance arms like Toyota Financial or Ford Motor Credit — and present you with the best offer they receive.
Here's the part most buyers don't know: dealers are allowed to mark up the interest rate above what the lender approved. If a lender approves you at 5.9%, the dealer might quote you 7.4% and pocket the difference as dealer reserve — extra profit that's completely invisible to you unless you ask.
On a $30,000 loan over 60 months, a 1.5% rate markup costs you roughly $1,200 in extra interest over the life of the loan. That's money going directly to the dealer, not your lender.
Getting pre-approved by your own bank or credit union before visiting a dealer gives you a rate commitment — usually valid for 30–45 days — that you can use as your benchmark. You know your rate before you sit down, and you have a number the dealer has to beat to earn your financing business.
Credit unions, in particular, often offer the lowest rates available to consumers and don't mark up the rate. What they quote is what you pay.
Dealer financing isn't always the bad guy. There are situations where it makes clear financial sense:
Get pre-approved by your bank or credit union before you go. Use that rate as your floor. Tell the dealer you have financing but you're open to hearing their offer. Let them compete. You can only win.
Manufacturers often make you choose between a low APR offer and a cash rebate — you can't take both. To decide which is better, compare the total interest you'd pay at 0% (zero) vs. taking the rebate and financing at your bank rate. Use our loan calculator to run both scenarios side by side.
On a $35,000 vehicle at 6.5% over 60 months, your total interest is about $6,100. If the cash rebate is $3,000 and you finance at 6.5%, you're financing $32,000 — total interest around $5,600. The rebate wins by roughly $2,600 in this example, but run your own numbers.
Run both scenarios with our Auto Loan Calculator before you decide.