Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Calculate your car loan payment, factoring in trade-in value, down payment, and sales tax.
Amount financed: $23750.00 (incl. $1750.00 tax)
$459.15
A car loan's real amount financed is rarely just the sticker price -- a trade-in reduces both the price and (in most states) the taxable amount, a down payment reduces the loan directly, and sales tax adds to what needs financing. This calculator nets all of that out before running the standard amortization math, a genuinely different amount-financed calculation than a plain personal loan.
Enter the vehicle price, your down payment, your trade-in value, your local sales tax rate, the loan's interest rate, and the term in months.
Taxable Amount = Vehicle Price − Trade-In Value
Sales Tax = Taxable Amount × Tax Rate
Amount Financed = Vehicle Price + Sales Tax − Down Payment − Trade-In Value
Not all states reduce the taxable amount by trade-in value -- most do, but always confirm your specific state's rule, since it directly affects your real amount financed.
Using the amount financed from the worked example above, $23,750 at 7%, the monthly payment is about $470 over five years and about $405 over six years. The six-year loan looks cheaper each month, but total interest is roughly $5,400 compared with about $4,470 for the five-year loan. Longer terms also raise the chance of being upside down, meaning you owe more than the car is worth, because vehicles tend to lose value faster than a long loan pays down. Comparing terms in the calculator helps you find a payment you can afford without stretching the loan longer than necessary.
The result is a planning estimate of your loan payment. The lender's final figure can differ slightly because of how it rounds, when the first payment is due, and any fees it adds. A common rule of thumb is to keep the car payment and related costs to a modest share of your take-home pay, but there is no universal standard, so choose the level that fits your own budget. If the payment is uncomfortable, consider a larger down payment, a less expensive vehicle, or a shorter list of options rather than only stretching the term.
In most US states, yes -- the taxable amount is the vehicle price minus the trade-in value, but a handful of states tax the full purchase price regardless of trade-in. Check your specific state's rule.
This calculator applies trade-in value to both the taxable amount and the amount financed automatically -- there's no separate choice to make, since a trade-in functions as both a tax reduction and a financing reduction in states that allow it.
No. It includes only the vehicle price, trade-in, down payment, and sales tax. If you plan to finance other fees, add them to the vehicle price so they flow into the amount financed.
You can use it for a used car purchase loan. It does not model a lease, which has different payment mechanics such as residual value and money factor.
Lenders may round differently, set the first payment date differently, or include fees. Small differences are normal, but large ones are worth asking about.
Reference: Consumer Financial Protection Bureau