Auto Loan Calculator
Estimate the amount financed, monthly payment, total interest, and amortization schedule for a fixed-rate auto loan based on the terms you enter. Educational estimate only — not a lender quote. Tax treatment varies by location; this tool uses a documented MVP tax assumption rather than inventing local rules.
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How this calculation works
Amount financed starts from vehicle price, subtracts down payment and trade-in value, then adds any remaining trade-in loan balance, estimated sales tax, and fees. Monthly payment and schedule use the shared fixed-rate amortization engine (with a zero-interest shortcut when APR is 0%).
MVP sales-tax assumption (not universal):
taxableAmount = vehiclePrice − downPayment − tradeInValue
salesTax = taxableAmount × (salesTaxRate ÷ 100)
If that taxable amount would be negative under this assumption, the calculator stops rather than inventing an alternate jurisdiction rule.
Assumptions
- Fixed-rate, fully amortizing loan with monthly payments.
- Fees and estimated sales tax are included in the amount financed.
- Trade-in loan payoff increases the amount financed when entered.
- Taxes are not assumed to already be included in vehicle price.
Limitations
- Does not reproduce every state or local vehicle tax rule.
- Does not invent lender rates, rebates, or dealer financing offers.
- Total vehicle cost shown is an estimate based on your inputs and the MVP tax assumption.
Frequently asked questions
- Will my state tax the car the same way?
- Not necessarily. Jurisdictions differ on trade-in credits, fees, and taxable base. This calculator documents one simplified MVP assumption so it does not silently invent local law.
- Are results a loan offer?
- No. They are educational estimates from the numbers you enter. Lenders use their own underwriting and pricing.
Related calculators
Related reading
- How auto loan interest works — Amount financed, MVP tax assumption, and fixed-rate amortization.
- Methodology