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The payment comes from the standard amortization formula: M = P × [r(1+r)^n] / [(1+r)^n − 1], where P is the amount financed, r is the monthly interest rate (APR divided by 12), and n is the number of months. Say you buy a $30,000 car with $4,000 down, so P = $26,000. At a 7% APR, r = 0.07 / 12 = 0.005833. Over 60 months, the payment is about $515. Over 72 months it drops to roughly $443, but total interest rises from about $4,890 to $5,900 — more than $1,000 extra for the same car. The calculator handles this math instantly, so you can test a 48-, 60-, and 72-month term side by side before you commit. If you're also weighing a home purchase, run the same numbers through our mortgage calculator to see how a car payment affects what you can afford overall.

Aim for at least 20% of the purchase price. On a $30,000 vehicle that's $6,000 down, leaving $24,000 to finance. At 7% for 60 months, that's about $475 per month and roughly $4,510 in interest. Compare that to $2,000 down on the same car: you finance $28,000, pay about $554 monthly, and shell out around $5,260 in interest — a difference of nearly $750. The 20% rule also protects you from negative equity, since new cars typically lose about 20% of their value in the first year. If you can only manage 10%, that's still far better than zero; even $3,000 down on a $30,000 car saves about $560 in interest over a 60-month loan at 7%. Use the calculator to test your exact down payment before you negotiate.

Longer terms lower the monthly payment but cost more overall and keep you in negative equity longer. On a $28,000 balance at 7%, a 60-month loan costs about $554 per month with roughly $5,260 in total interest. Stretch it to 72 months and the payment falls to about $478, but interest climbs to around $6,400. At 84 months the payment is roughly $423 and interest hits about $7,550 — nearly $2,300 more than the 60-month option. The bigger risk is depreciation: after three years, a new car may be worth only 50–55% of what you paid, while an 84-month loan still has four years left. If you need a longer term to make the payment fit, that's usually a sign the vehicle is too expensive for your budget. Compare shorter terms in the calculator and also run your full debt picture through our loan calculator.

Rates swing widely based on credit score, new versus used, and term length. As a rough 2024–2025 range for new cars: borrowers with scores above 780 often see 4.5–6%, scores of 660–689 land around 8–10%, and scores below 600 can face 14% or higher. Used-car rates run roughly 1–2 points higher across the board. The gap matters: on a $25,000 loan over 60 months, 5% costs about $472 per month and $3,310 in interest, while 10% costs about $531 per month and $6,870 in interest — a $3,560 difference for the same car. Always get pre-approved at a credit union or bank before visiting the dealer, then let the dealer try to beat it. A single rate shopping window of 14 days lets you compare multiple lenders without stacking hard inquiries. Once you have your car payment, check how it fits with your mortgage using our mortgage calculator.

Dealers often advertise 0% or 1.9% promotional rates, but those usually apply only to specific models, short terms, or buyers with top-tier credit — and you may forfeit a cash rebate to get them. Run both scenarios: a $30,000 car with a $3,000 rebate financed at 6.5% for 60 months costs about $527 per month, while the same car at 0% with no rebate costs $500 per month. The 0% deal saves only about $27 monthly and roughly $1,620 in interest — less than the rebate in some cases. Credit unions frequently beat dealer financing by 0.5–1.5 points for average credit, which on a $27,000 60-month loan is worth $400–$1,100. Get pre-approved first so you can treat dealer financing as one more quote to compare, not your only option. Our personal loan calculator works well for side-by-side comparisons of any two offers.

A trade-in counts as part of your down payment, reducing the amount you finance. If a dealer offers $9,000 for your current car and you owe $4,000 on it, you have $5,000 of equity to apply. On a $32,000 vehicle, that drops the financed amount from $32,000 to $27,000 — cutting a 60-month payment at 7% from about $634 to roughly $535, and total interest from about $6,020 to $5,080. The catch is negative equity: if you owe $12,000 and the trade is worth $9,000, that $3,000 shortfall gets rolled into the new loan, so you'd finance $35,000 instead. That raises the payment to about $693 and adds interest on money you no longer have an asset for. Always get a separate quote from CarMax or an online buyer before accepting the dealer's trade number, since the difference often exceeds $1,000. Enter the net equity figure as your down payment in the calculator to see the real impact.