Home › Tools › Car Down Payment Calculator

Car Down Payment Calculator

Enter a down payment as a percentage or a dollar amount to see exactly how it changes your loan balance, monthly payment, and total interest. Watch how much a bigger deposit saves over the life of the loan.

Recommended down payment (your %)
$0
Amount financed$0
Monthly payment$0
Total interest$0
Saved vs zero down$0
Tools · By Mustafa Bilgic · Last updated 20 June 2026

How the down payment changes everything

Your down payment is the cash you pay up front, and it comes straight off the amount you have to finance. A smaller loan means a lower monthly payment and, because interest is charged on the balance, far less total interest over the term. This calculator takes your chosen down-payment percentage, applies it to the vehicle price, subtracts any trade-in, adds estimated sales tax, and runs the standard amortization formula to show the payment and interest — then compares it against putting nothing down so you can see the dollars saved.

Worked example: On a $32,000 car at 6.5% over 60 months with 7% tax and 20% ($6,400) down, you finance about $27,840 and pay roughly $545/month with about $4,840 in interest. With zero down you finance $34,240, pay about $670/month, and hand the lender around $5,950 in interest — so 20% down saves over $1,100 in interest and $125 a month.

The 20% guideline

A widely used rule is to put at least 20% down on a new car (10% on a used one). New cars lose roughly a fifth of their value in the first year, so a 20% deposit keeps your loan close to the car's actual worth and protects you from negative equity — owing more than the car is worth if you have to sell early. A healthy down payment also makes approval easier and can earn a better rate, because the lender is taking less risk on a smaller loan relative to the collateral.

Avoid the long-term trap. A tiny down payment stretched over 72–84 months is the classic path into negative equity. Keep the term short and the deposit meaningful. See leasing vs buying for another angle.

Build your full financing plan

Pair this with the car loan calculator to lock in the payment, the car affordability calculator to set a price ceiling, and the lease vs buy calculator to weigh financing against a lease. Understanding why down payments matter also means understanding depreciation — estimate yours with the depreciation calculator.

Frequently asked questions

How much should I put down on a car?

A common guideline is at least 20 percent down on a new car and 10 percent on a used one. Twenty percent roughly offsets the steep first-year depreciation, so you are less likely to owe more than the car is worth. A larger down payment also lowers your monthly payment and the total interest you pay. If 20 percent is out of reach, put down what you comfortably can, since every extra dollar reduces both the loan and the interest.

Does a bigger down payment lower the interest rate?

Not directly in most cases, but it can help. The rate is set mainly by your credit, the term, and the lender. However, a larger down payment means a smaller loan relative to the car's value, which lenders view as lower risk, and that can earn you a better rate or approval. Even when the rate stays the same, a bigger down payment always lowers the total interest because you are borrowing less.

What is negative equity and how does a down payment help?

Negative equity, or being upside down, means you owe more on the loan than the car is worth. It happens because cars depreciate fastest in the first year while the loan balance falls slowly, especially on long terms with little down. A solid down payment keeps the loan below the car's value from the start, so a small down payment plus a long term is the classic recipe for negative equity. Putting more down is the simplest way to avoid it.