Car Payment Calculator

How this calculator gets from sticker price to monthly payment

This tool works in three steps. First, it applies sales tax to the vehicle price after subtracting your trade-in value (the way most, but not all, states calculate trade-in tax credit), producing a taxable amount and tax owed. Second, it subtracts your down payment and trade-in value from the price-plus-tax to arrive at the actual amount financed. Third, it runs that loan amount through the standard auto loan amortization formula to produce a fixed monthly payment over your chosen term. For a detailed month-by-month breakdown, try our free amortization calculator. On a $30,000 car with a $3,000 down payment, no trade-in, 7% sales tax, 6.5% APR, and a 60-month term, that comes out to a loan amount of $29,100 and a payment of about $569 a month.

This tool is about monthly affordability, not total interest

The headline number here is the monthly payment, because that's usually the number that decides whether a car fits a budget in the first place most buyers are shopping within a payment range, not a total-interest range. That said, the total interest and total cost figures below the payment matter too: a payment that looks affordable over 72 or 84 months can end up costing thousands more in interest than the same car financed over 48-60 months. If total interest paid is your main concern rather than the monthly number, our free car loan calculator presents the same math with that framing, minus the sales tax step.

How loan term and rate change the outcome

Stretching the term from 60 to 72 or 84 months lowers the monthly payment noticeably, but it also means paying interest over a longer stretch, which raises total interest paid even at the same rate. Longer terms also increase how long you're likely to owe more than the car is worth, since vehicle depreciation in the first few years typically outpaces how quickly a long loan reduces principal. A lower APR usually earned through a stronger credit score, a shorter term, or shopping multiple lenders instead of accepting the first offer reduces both the monthly payment and total interest simultaneously, which is why rate shopping is usually worth more than it seems. For any fixed-rate loan comparison, use our free loan calculator to model scenarios with different rates and terms.

Trade-in value works two ways in this calculation

A trade-in reduces what you owe twice: once by lowering the taxable purchase price in states with a trade-in tax credit, and again by directly reducing the amount financed. A $5,000 trade-in on a $30,000 purchase with 7% sales tax saves $350 in tax on top of the $5,000 reduction in loan principal a detail that's easy to miss when comparing a trade-in offer to simply selling the car privately.

FAQ

Does this include registration fees?
No this estimates the loan payment and sales tax only. Registration, title, dealer documentation fees, and any add-on products vary by state and dealership and aren't included in this estimate.

Does my state tax the trade-in value?
Many states reduce the taxable price by your trade-in value, which is what this calculator assumes but rules vary by state, and a handful tax the full purchase price regardless of trade-in, so check your local DMV or tax authority for an exact figure.

How is the taxable amount actually calculated here?
This calculator subtracts your trade-in value from the vehicle price first, then applies the sales tax rate to that reduced amount reflecting the trade-in tax credit many states offer. The tax is then added back on top of the price, and your down payment and trade-in are subtracted to arrive at the amount actually financed.

Why does this calculator focus on the monthly payment rather than total interest?
Because affordability is usually the deciding question when shopping for a car: can this payment fit the monthly budget. This tool still shows total interest and total cost, but the headline number is the monthly payment since that's what most buyers compare across different price points and loan terms.

How does the loan term affect what I actually pay?
A longer term (72 or 84 months instead of 60) lowers the monthly payment but stretches out interest charges over more months, increasing total interest paid. It also raises the risk of being "upside down" owing more than the car is worth for a longer stretch of ownership, since vehicles depreciate faster than a long loan pays down principal in the early years.

Should I finance through the dealer or my own bank or credit union?
It's worth comparing both. Dealers sometimes offer promotional low-APR financing on certain models, but a pre-approved rate from your own bank or credit union gives you a real number to negotiate against and protects you from accepting a higher dealer-arranged rate by default.