Auto Loan Payment and Disclosure Calculator. Reproduce amount financed and fixed monthly payments with itemized fees, add-ons, trade allowance, prior-loan payoff, cash and credits.
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Reproduce a written auto-loan amount financed and fixed payment while exposing trade payoff, negative equity, fees, optional add-ons, cash, credits, APR, and term.
See the trade allowance reduce financing without confusing it with cash down.
Enter the written cash price, quote itemization, zero payoff, allowance, cash, APR, and term.
Can reconcile amount financed, payment, and total without focusing on payment alone.
See a prior-loan payoff larger than the trade allowance.
Enter allowance and payoff separately and inspect the signed net trade position before comparing the quote.
Recognizes negative equity added to financing and does not treat the allowance as owned equity.
Identify what the lender is financing beyond the vehicle.
Copy taxes/fees, optional add-ons, credits, and disclosure totals into the bounded model.
Can challenge mismatched or unwanted items and verify cancellation and contract terms.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
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Turn an entered monthly vehicle budget into a loan and price ceiling after running costs, cash, net trade equity and taxes or fees.
Enter only costs actually financed. Cash paid outside financing and a credit already included in price must not be entered twice.
Principal = cash price + taxes/fees + financed add-ons + prior payoff − trade allowance − cash down − rebatesThe contract annual interest rate is divided by 12. A zero rate divides principal by whole monthly payments. The lender’s rounding and timing can differ.
Payment = P × r ÷ [1 − (1 + r)^−n]Updated: September 2026
$35,000 cash price, $2,800 taxes/fees, $8,000 trade allowance, $6,500 prior payoff, $5,000 down and no other add-ons or rebates.
→ $1,500 net trade equity and $31,300 amount financed before payment calculation.
The entered trade allowance equals the current prior-loan payoff.
→ Zero net trade equity; neither figure alone is a down payment.
Compare principal, APR, finance charge, total payments, term and cash due together.
Obtain the actual contractual interest rate and itemized disclosure.
Copy a written auto-loan scenario into separate price, fees, trade, prior debt, cash and credit fields. Use the contract annual interest rate to model monthly amortization. Compare the output with the lender’s complete disclosures and actual payment schedule.