Does every state tax trade-ins this way?

No. Tax bases differ. Treat the tax line as a scenario, not a legal determination.

Are dealer add-ons included?

Only if you put them in fees or the vehicle price yourself.

Is this a lease calculator?

No. It models a purchase loan payment, not residual-value lease math.

Free Calculators Hub

Car Payment Calculator with Tax & Trade-In

Budget a monthly payment after simplifying trade-in credit, sales tax, and fees into the amount financed.

Trade-in & tax

Fees financed

Payment focus

Builds a payment-focused auto finance estimate including trade-in, a simplified sales-tax base, fees, down payment, rate, and term.

Limitation: Educational budget estimate only.

Jump to calculator · Sources & review

Free Calculators HubCar Payment Calculator

CurrencyVehicle priceTrade-in allowanceSales tax rate (%)Applied to price minus trade-in in this simplified model.Fees financedDoc, title, or other fees you expect to roll into the loan.Cash down paymentFixed annual interest rateTerm in months

How to Estimate a Car Payment

Start from the out-the-door pieces you expect to finance, then apply a fixed rate and term.

Enter vehicle price and trade-in allowance.

Need the full schedule?

Open the auto loan calculator for a payment-by-payment amortization table on a cleaner financed amount.

What the Car Payment Breakdown Shows

Taxable amount after trade-in, estimated sales tax, fees, amount financed, payment, and interest totals—without a full schedule table.

Worked Car Payment Examples

Trade-in, 7% tax, fees, and 48 months

Inputs

vehiclePrice:28000

tradeInAllowance:4000

salesTaxRate:7

fees:500

downPayment:3000

annualRate:6.5

termMonths:48

Result

549.71 payment

Taxable base 24,000; tax 1,680; financed 23,180.

No tax or fees at 0% interest

Inputs

vehiclePrice:20000

tradeInAllowance:0

salesTaxRate:0

fees:0

downPayment:5000

annualRate:0

termMonths:30

Result

500.00 payment

Financed amount 15,000 split evenly.

Frequently Asked Questions

This page is payment-focused and includes tax/fees in the financed amount. The auto loan page is a cleaner loan worksheet with a full schedule.

Still have questions about this calculation?

Try the Calculator

Car Payment Formulas

A simplified purchase worksheet plus standard amortization.

Imperial:For imperial units: max(0, vehicle price − trade-in allowance)

Formula

max(0, vehicle price − trade-in allowance)

Taxable amount

max(0, vehicle price − trade-in allowance)

Amount financed

price − trade-in − down payment + sales tax + fees

Monthly payment

Fixed-rate amortizing payment on amount financed

Scientific Background

Assumptions: fixed rate, monthly payments, tax on price minus trade-in only. Limitations: negative equity, lease residuals, balloon payments, and variable APR products are omitted. Cross-check with CFPB auto loan consumer tools.

Sources & review

Car Payment Calculator documents the references behind its formulas and assumptions. Always treat results as educational estimates, not personalized professional advice.

Last reviewed

July 22, 2026

Consumer financial tools
Consumer Financial Protection Bureau (CFPB)
https://www.consumerfinance.gov/consumer-tools/auto-loans/
Consumer financial tools
Consumer Financial Protection Bureau (CFPB)
https://www.consumerfinance.gov/ask-cfpb/what-is-amortization-and-how-could-it-affect-my-auto-loan-en-771/
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/methodology

See our methodology and corrections policy.