Auto Lease Calculator

Before you calculate

Use this calculator when you want to check how auto price, residual value, lease term, money factor, entered interest rate, down payment, trade-in value, and sales-tax assumption affect a lease estimate. Use Auto Loan for a purchase loan, Cash Back or Low Interest for vehicle incentive comparisons, Lease for a generic asset lease, APR or Loan Payment for broader borrowing math, and Debt-to-Income or Budget for monthly pressure. Use CFPB Regulation M, eCFR Part 1013, CFPB auto-loan materials, FTC auto marketplace materials, state tax or DMV sources, dealer or lessor documents, insurer documents, and legal sources before treating disclosures, taxes, fees, ads, mileage, wear, insurance, purchase options, approval, or contract terms as settled.

Formula summary

leaseTermMonths is max(1, round(leaseTermMonths)). Money factor is the entered moneyFactor, or interestRate / 2400 when rateType is interestRate. In monthly-payment mode, adjustedCapitalizedCost = max(0, autoPrice - downPayment - tradeInValue). Monthly depreciation charge = (adjustedCapitalizedCost - residualValue) / leaseTermMonths. Monthly finance charge = (adjustedCapitalizedCost + residualValue) * moneyFactor. Base payment is depreciation plus finance charge, monthly payment is base payment * (1 + salesTaxRate / 100), and monthly sales tax is the taxed payment minus the untaxed payment. Total lease payments are monthlyPayment * leaseTermMonths, total lease cost is total lease payments plus down payment, and due-at-signing estimate is down payment plus the first monthly payment. Auto price mode divides the target payment by the tax multiplier, solves adjusted capitalized cost algebraically, then adds down payment and trade-in value.

Worked example

Example: $50,000 auto with a 0.00208 money factor

With the default inputs, a $50,000.00 auto price minus a $10,000.00 down payment and $0.00 trade-in gives a $40,000.00 adjusted capitalized cost. A $24,000.00 residual over 36 months gives a $444.44 monthly depreciation charge. The finance charge is ($40,000.00 + $24,000.00) * 0.00208, or $133.12 per month. Before tax, the modeled payment is $577.56; with 7 percent entered sales tax, the payment is $617.99 and monthly sales tax is $40.43. Total lease payments are $22,247.78, total lease cost is $32,247.78 including the down payment, and the due-at-signing estimate is $10,617.99. In the interest-rate fixture, 6 percent converts to a 0.00250 money factor and reports a $517.63 payment. In target-payment mode, a $600.00 monthly payment implies an auto price near $49,436.77.

The examples show how the app combines cap cost, residual value, money factor, tax, and term. They do not quote a dealer payment, determine approval, price taxes or fees, or recommend whether to lease or buy.

Assumptions

• The model uses one simplified lease structure with whole-month term, entered residual value, entered tax rate, and either a money factor or the app's interest-rate-to-money-factor conversion. Equivalent APR is moneyFactor * 2400 for calculator context; it is not a legal APR disclosure or a Regulation M lease disclosure.
• Down payment and trade-in value reduce the adjusted capitalized cost in this model. Real leases can handle cap-cost reductions, rebates, incentives, negative equity, fees, taxes, and payoff balances differently by state, lessor, dealer, program, and contract.
• The calculator excludes acquisition fees, registration, title, documentation fees, disposition fees, mileage penalties, excess wear, insurance, maintenance, purchase-option fees, dealer add-ons, product-specific residual rules, and approval checks. Scoped independent comparator checks pass for overlapping lease-payment outputs, while CFPB Regulation M, eCFR Part 1013, CFPB, FTC, state tax, DMV, lessor, dealer, insurer, and legal sources are needed before making real disclosure, tax, fee, advertising, approval, contract, consumer-rights, or jurisdiction-specific claims. Results are educational estimates, not financial, legal, tax, lending, consumer-credit, vehicle-lease, or personalised advice.

Common mistakes to avoid

• Reading the monthly lease payment as the full cost to drive the vehicle. The calculator does not include acquisition, registration, documentation, disposition, mileage, wear, insurance, maintenance, purchase-option, or contract-specific costs.
• Treating equivalent APR as the lease's official disclosure rate. The calculator only uses the common money-factor conversion for its formula context.
• Assuming sales tax, down payment, trade-in value, rebates, negative equity, and due-at-signing cash are handled the same way in every state or contract. The page uses entered assumptions, not an official tax or lease worksheet.

Methodology and sources

This calculator is an original implementation based on the app's documented auto-lease formulas, fixed planning assumptions, deterministic fixtures, edge cases, rounding policy tests, and internal validation. It is not copied from a single source.

Outputs are checked with deterministic fixtures, edge cases, rounding policy tests, and internal validation artifacts. The result remains an educational estimate, not a dealer quote, Regulation M consumer lease disclosure, lease contract review, tax answer, registration or title estimate, insurance quote, approval decision, vehicle recommendation, or personalised advice.

Formula version 2026.05.22-us-auto-lease-money-factor. The version marks the calculation logic and validation fixture set used for this estimate.

• CFPB Regulation M and eCFR 12 CFR Part 1013 should be used before copy discusses consumer lease disclosures, payment schedules, early-termination notices, purchase-option disclosures, advertising, renegotiations, assumptions, or legal lease terminology.
• CFPB auto-loan and vehicle-finance materials plus FTC auto marketplace, financing, leasing, add-on, and dealer-advertising materials should be used before copy discusses vehicle-finance comparisons, dealer claims, promotions, add-ons, advertised restrictions, pricing, or consumer-protection context.
• State tax authorities, DMV or title agencies, dealer documents, lessor contracts, manufacturer program terms, insurer documents, state regulators, legal sources, and current contract materials should be used before copy discusses sales-tax treatment, registration, title, acquisition or disposition fees, documentation fees, mileage, excess wear, insurance, residual values, money factors, rebates, incentives, negative equity, purchase options, approval, underwriting, product-specific terms, consumer rights, or jurisdiction-specific claims.

Estimate only

The result is educational and is not financial, tax, legal, lending, investment, or regulated advice. Real provider terms, fees, rates, taxes, and personal circumstances can change the final answer.

Formula and help: read the full auto lease calculator methodology notes.

Related reading

• How Calcs.finance validates calculator formulas
• Estimate limitations and not-advice disclaimer

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