The real monthly payment on that car — trade-in, sales tax and all — before you're sitting in the finance office.
Dealers sell payments, not prices. Stretching a $35,000 loan at 7% from 60 to 72 months drops the payment from about $693 to $597 — feels great — but you pay roughly $1,400 more in interest, and at 84 months it's about $2,800 more. Longer terms also mean more years owing more than the car is worth.
Sales tax and your trade-in: in most states you only pay tax on the price minus your trade-in — that's how this calculator works. A handful of states (California is the big one) tax the full price with no trade-in credit, so set your trade-in's tax effect accordingly and check your state's DMV page. We also assume tax is rolled into the loan, which is what most buyers do.
The cleanest negotiating move: settle the vehicle price first, then the trade-in, then financing — three separate conversations, so a "great" number in one can't hide a bad one in another.
Estimates are for education, not financial advice. Your lender's exact numbers may differ slightly.
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