How to read the result
Amount financed is the net purchase amount placed into the loan. The payment and interest use fixed-rate amortization across the selected term.
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Car payment with trade-in, tax and dealer fees
Estimate an auto-loan payment from the actual vehicle price after down payment and trade-in, then add sales tax and fees before amortizing the financed balance.
How to use this calculator
- Start with the negotiated vehicle price, not the sticker price, then enter cash down and trade-in credit.
- Add the local sales-tax assumption and itemized title, registration or dealer fees.
- Compare loan terms using both monthly payment and total interest before accepting financing.
What this estimate does not capture
Trade-in tax treatment, rebates, add-ons, negative trade equity and lender fees vary. Verify every line against the buyer's order and loan disclosure.
UNDERSTAND THE NUMBERS
A smaller monthly payment can hide a larger bill
Fixed educational example · independent of your inputs above. $ means US dollars; these are not current rate quotes or return forecasts.
Use a $30,000 car, $3,000 cash down, $5,000 trade-in, 6% sales tax on price minus trade-in, and $500 fees. Financed principal is $24,000. Compare four and six years at 7% annual interest.
| Term | Monthly payment | Total loan interest |
|---|---|---|
| 4 years | $574.71 | $3,586.07 |
| 6 years | $409.18 | $5,460.68 |
What the difference tells you
The six-year option reduces the monthly commitment but charges interest for longer. Compare the car price and financed amount before negotiating around a monthly payment: the same monthly target can be achieved by extending the loan rather than lowering the price.
Before drawing a conclusion
Trade-in tax treatment varies, and this example uses the calculator's specific subtraction rule. An outstanding loan on the traded vehicle, depreciation, insurance and maintenance are not included. Trade-in value is not automatically the same as net equity.
A comparison to try
Keep the term fixed and lower the vehicle price by $2,000. Compare that payment reduction with extending the term, and note which choice reduces total interest as well.
Explore extra repayments after purchase →References for this explanation
Prepared by EconoPi · examples and explanations reviewed September 19, 2026. Tables are our calculations under stated assumptions, not forecasts or recommendations by the referenced organizations.
Frequently asked questions
How is the amount financed calculated?
Vehicle price minus cash down and trade-in, plus modeled sales tax on the taxable price and entered title, registration or dealer fees.
Does a longer car loan lower the cost?
It lowers the monthly payment but usually increases total interest and keeps the loan outstanding while the vehicle depreciates.
Is the trade-in taxed?
Rules differ. Some jurisdictions tax the price after trade-in credit and others do not, so confirm the buyer's order.
What APR should I enter?
Use the annual interest rate for the installment calculation. The calculator divides it by 12 and adds the entered fees to principal separately; a fee-inclusive disclosed APR can produce a different estimate.
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