The Car Loan Calculator combines a vehicle's price, sales tax, fees, trade-in value, rebate and down payment into the actual amount financed, then builds the full monthly payment and amortization schedule from that number. Enter each piece of a real car deal, and the calculator shows exactly how they add up before a single loan payment is even calculated.
Car deals rarely reduce to a single clean number the way a simple loan does. Tax gets added to the price, a trade-in and any rebate get subtracted, a down payment reduces the amount financed further, and only what is left actually becomes the loan. The Car Loan Calculator walks through that full chain so the financed amount, and the payment it produces, reflects the deal as it is actually structured rather than just the sticker price.
*These results are estimates for information only, not lending advice.*
Build the financed amount from every part of the deal
The amount actually financed on a car loan is the vehicle price plus sales tax on that price, plus any fees, minus the trade-in value, minus any manufacturer rebate, minus the cash down payment.
Every one of those pieces moves the financed amount in a predictable direction: price, tax and fees push it up; trade-in, rebate and down payment pull it down.
Take a $25,000 vehicle with 6% sales tax, $500 in fees, a $2,000 trade-in, no rebate and a $3,000 cash down payment. Tax on the price comes to $25,000 x 0.06 = $1,500. Adding price, tax and fees gives $25,000 + $1,500 + $500 = $27,000. Subtracting the trade-in, rebate and down payment removes $2,000 + $0 + $3,000 = $5,000, leaving a financed amount of $22,000. The Car Loan Calculator performs that full addition and subtraction automatically so the number that actually gets financed is never confused with the sticker price.
Turn the financed amount into a monthly payment
Once the financed amount is established, the Car Loan Calculator applies the standard fixed-payment amortization formula to find the monthly installment: Payment = P x [i(1+i)^n] / [(1+i)^n - 1], where P is the financed amount, i is the monthly interest rate and n is the number of monthly payments.
On the $22,000 financed amount above, at a 6.5% annual interest rate over 5 years (60 monthly payments), the monthly rate is 6.5% divided by 12. Running the numbers through the formula produces a monthly payment of about $430.46. Over the full 60-month term, this loan accrues roughly $3,827.24 in total interest, meaning total payments come to about $25,827.24 against a $22,000 financed amount.
See how each deal component moves the payment
Because every input feeds directly into the financed amount before the loan math even begins, changing any one piece of the deal ripples through to the final payment. A larger trade-in value lowers the financed amount and therefore the payment; a larger down payment does the same.
Sales tax, on the other hand, is calculated on the full vehicle price regardless of trade-in or rebate, so a higher-tax state or county raises the financed amount even if every other input stays the same.
The Car Loan Calculator lets each of these pieces be adjusted independently, so the effect of, say, doubling the down payment or adding a $1,500 manufacturer rebate can be seen directly in both the financed amount and the resulting monthly payment, without having to redo the arithmetic by hand each time.
Read the amortization schedule behind the payment
Beyond the single monthly payment figure, the Car Loan Calculator produces the full period-by-period amortization schedule for the financed amount: how much of each payment goes to interest versus principal, and what the remaining balance is after every month.
Early payments carry a larger interest share because interest is charged on the full remaining balance, which is largest at the start of the loan; later payments shift toward mostly principal as the balance shrinks.
This schedule view answers questions a single payment number cannot, such as how much of the loan would remain if it were paid off early, or how much total interest a shorter or longer term would actually cost across the life of the loan.
Know what this deal calculation does not include
This calculation covers the arithmetic of price, tax, fees, trade-in, rebate, down payment and standard loan amortization. It does not include dealer financing incentives tied to specific credit tiers, gap insurance, extended warranties, negative equity carried over from a previous loan, or state-specific tax rules that apply tax differently to trade-in credits.
Some states subtract the trade-in value from the price before applying sales tax rather than taxing the full price, which changes the tax figure from the simple version shown here.
Always confirm the exact tax treatment, fees and financing terms with the dealership's official paperwork before treating this estimate as a firm number for a real purchase.
Frequently asked questions
How is the amount financed on a car loan calculated?
The amount financed is calculated as vehicle price plus sales tax on that price plus fees, minus trade-in value, minus any rebate, minus the down payment. On a $25,000 vehicle with 6% tax, $500 fees, a $2,000 trade-in and a $3,000 down payment, the financed amount comes to $22,000.
What is the monthly payment on a $22,000 car loan at 6.5% for 5 years?
A $22,000 car loan at a 6.5% annual interest rate over 5 years (60 monthly payments) has a monthly payment of about $430.46, with total interest over the term of roughly $3,827.24.
Does a bigger trade-in always lower the payment?
Yes, a larger trade-in value reduces the financed amount directly, which lowers the resulting monthly payment, assuming the interest rate and loan term stay the same.
Is sales tax calculated before or after the trade-in is subtracted?
In this calculator, sales tax is calculated on the full vehicle price before the trade-in is subtracted. Some states instead apply tax only to the price minus the trade-in value, so check local rules for an exact real-world tax figure.
Does this calculator include dealer fees like documentation charges?
Yes, a general fees field is included and added to the financed amount alongside the price and tax. Enter the total of all dealer fees, including documentation charges, in that field for an accurate financed amount.
Summary
The Car Loan Calculator turns a real car deal, price, sales tax, fees, trade-in, rebate and down payment, into the actual financed amount and the resulting monthly payment and schedule.
A $25,000 vehicle with 6% tax, $500 in fees, a $2,000 trade-in and a $3,000 down payment finances $22,000, which at 6.5% over 5 years pays about $430.46 per month with roughly $3,827.24 in total interest.
Every deal component moves the financed amount in a predictable direction, and the full schedule shows exactly where each payment goes. These figures are estimates only, not a financing offer or lending advice.