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Auto Loan Calculator

Compare the transaction, not just the monthly payment. Include the debt that must be settled on your trade-in.

Auto Loan Calculator estimate

Vehicle priceDown paymentTrade-in valueSales tax (%)Title, registration and other feesNote interest rate (%)Loan term (months)

Advanced assumptions

Amount owed on trade-in (payoff quote)Cash rebateFinance taxes and fees?Does trade-in value reduce your taxable price?Does the rebate reduce your taxable price?

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Your estimate

Enter values, then calculate.

How the estimate works

Net trade equity is trade-in value minus its payoff debt. The purchase balance is price minus rebate minus net trade equity, plus taxes and fees if financed. Cash down reduces borrowing; upfront taxes and fees remain separate.

Method source

CFPB: trading in a car that is not paid off. Background guidance; the assumptions and specific model are described above.

Important limitation

Tax treatments are editable assumptions, not state tax advice. Verify whether your jurisdiction allows trade-in or rebate deductions. A payoff quote can differ from a statement balance. Dealer add-ons, insurance and future operating expenses are not included. Results are estimates only and are not financial, lending, legal, tax, or investment advice.

Assumptions and review

Formula review: September 25, 2026. This tool uses only the editable values shown above and does not pull live rates, prices, balances, or account data.

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See this calculator in a worked example

Follow the assumptions and results, then try the example with your own numbers.

Trading in a car with debt: where the negative equity goes — Trace a $10,000 trade-in with a $12,000 payoff through a new auto purchase, rebate, sales tax, fees and monthly payments.

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Frequently asked questions

What happens when I owe more than the trade-in is worth?

The difference is negative equity. This model adds that debt to the purchase balance before cash down; borrowing it increases the amount financed.

Are trade-ins and rebates deducted before sales tax?

Only when you select the corresponding tax assumption. Rules vary, so the default deducts neither. Confirm the taxable amount with the actual transaction documents.

What does net cash outlay exclude?

It excludes the trade-in asset you give up, future insurance, fuel, maintenance and depreciation. It is a financing cash-flow total, not a total ownership-cost estimate.

Auto Loan Calculator