How this calculator works
Amount financed = price − down − trade-in (+ sales tax where applicable). Monthly payment = amortized payment on that amount. Total cost = price + all interest paid over the term.
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Car Loan Calculator — Monthly Payment with Tax & Trade-In
Dealers negotiate the payment, not the price — that's how 84-month loans hide overpaying. Run the real numbers here first: price, trade-in, down payment, tax and APR.
Scenario examples (2026 rates)
| Car price ($) | Monthly payment |
|---|---|
| 17,500 | $311.59 |
| 26,250 | $497.44 |
| 35,000 | $683.29 |
| 52,500 | $1,055 |
| 70,000 | $1,426.7 |
Every number above is computed by the same in-browser engine as the calculator — nothing is hardcoded.
How the amount financed is really built
Dealers quote one number, but the amount you finance is assembled from several: negotiated price, plus sales tax where your state taxes the full price, plus documentation and registration fees, minus your cash down payment and trade-in equity. This calculator mirrors that build. On a $35,000 car with a $3,000 down payment, no trade-in, and 6 percent tax, the financed amount is $32,000 plus tax on the taxable portion, and every dollar in that stack earns interest for the whole term. Two details trap buyers. First, tax is charged on the sticker math, not your payment, so a lower monthly figure never lowers it. Second, the trade-in credit only helps if the vehicle has positive equity; a $4,000 payoff against a $2,500 trade value adds $1,500 to the loan instead of subtracting. Get the out-the-door price in writing, enter its components here, and only then discuss payments.
Term length and the interest you actually pay
Term choice is the strongest lever a buyer controls after the price. On $32,000 financed at 7.5 percent, a 60-month loan pays about $641 per month and $6,473 in total interest, while a 72-month loan drops the payment to roughly $553 but raises total interest to about $7,836, more than 20 percent extra for one year of smaller checks. Longer terms also slow equity growth: after two years on the 72-month loan you have repaid barely a sixth of principal, while depreciation has typically removed 30 to 40 percent of the car value, leaving many borrowers underwater and dependent on gap coverage. Keep terms at 60 months or less for most purchases, and if the payment at 60 months is unaffordable, the honest answer is a cheaper car, not a longer loan.
Financing order that saves the most money
Sequence matters. Before visiting any dealer, get a preapproval from a credit union or bank; credit unions averaged roughly 2 percentage points below captive lender rates on used cars in recent years, and a preapproval gives you a rate floor the dealer must beat. Negotiate the out-the-door price first, treat the trade-in as a separate transaction second, and discuss monthly payments last, once the financed amount and rate are fixed. Dealers who know your payment target can hit it by stretching the term or inflating the amount financed, which is why the four-square worksheet exists. When the finance office presents its rate, compare it against your preapproval APR and decline every add-on you did not research in advance. Run the final numbers through this calculator in the parking lot if needed; a two-minute check catches term stretching and packed payments before you sign.
FAQ
What credit score gets the best car rate?
740+ typically qualifies for the lowest rates. Borrowers under 660 pay 3–8% more APR, which can add thousands to a 5-year loan.
Should I finance for 72 or 84 months?
Only if necessary. A longer term lowers the payment but raises total interest dramatically — compare 48 vs 72 months with the years field.
Is sales tax on the full price?
In most US states yes; some states tax only price minus trade-in. Set tax to 0 if your state doesn't tax vehicle sales.
What does it cost to finance a car at 0 percent?
Manufacturer 0 percent APR is genuine free money when offered by the captive lender, usually on specific new models for well-qualified buyers with scores around 700 or higher. The catch is that 0 percent deals rarely stack with cash rebates, which commonly run $1,500 to $4,000. On a $35,000 car financed for 60 months, taking a $3,000 rebate and financing the remaining $32,000 at 7.5 percent costs about $6,473 in interest, but the 0 percent route forgoes the rebate and costs $0 in interest, so 0 percent wins. Run both scenarios here: enter the rebate as a down payment with your credit-union APR, then enter zero APR without the rebate, and pick the lower total cost.
Should I roll my negative equity into the new loan?
Rolling trade-in debt into a new loan means owing more than the car is worth from day one, which is how most totaled or repossessed vehicles end up in collections. If you must do it, keep total loan-to-value under 125 percent, gap insurance becomes mandatory, and choose the shortest term you can afford. A better path: delay the purchase a few months, pay the difference down to positive equity, or sell privately since private-party prices typically beat trade-in offers by 10 to 20 percent. Enter the true payoff, not the trade-in estimate, in this calculator to see the real amount financed before you sit down with a finance manager.
Do dealer add-ons change the monthly payment much?
They change it more than most buyers expect because add-ons are financed and pay interest for years. A $1,200 extended warranty, $400 of nitrogen and tint, and a $900 service contract add $2,500 to the amount financed, which at 7.5 percent over 72 months is roughly $43 per month and about $590 of extra interest, pushing $3,100 of true cost into the deal. Dealers present these as small monthly increments precisely because the framing hides the total. List every add-on price before financing, decline the ones you cannot buy cheaper elsewhere, and re-run this calculator with only what you actually want. The total cost line, not the monthly payment, is the number to negotiate.