How the Lease Calculator works
Leasing a car means paying for the portion of its value you use up during the lease term, plus a finance charge on the money tied up in the vehicle. This calculator uses the standard method finance companies use to build a lease quote: a depreciation fee, a finance fee (rent charge), and sales tax layered on top.
The formula
Start with the Adjusted Capitalized Cost: the negotiated vehicle price minus your down payment or trade-in credit. Then:
Depreciation Fee = (Adjusted Cap Cost − Residual Value) / Lease Term
Finance Fee = (Adjusted Cap Cost + Residual Value) × Money Factor
Adding these two gives the pre-tax monthly payment. Sales tax is then applied to that payment (the method used by most, but not all, states), and the taxed amount is your total monthly payment.
Worked example
Take a $35,000 vehicle with a $3,000 down payment, a $19,250 residual value (55% of MSRP), a 36-month term, a money factor of 0.00125, and 7% sales tax. The adjusted cap cost is $32,000. Depreciation fee = ($32,000 − $19,250) / 36 ≈ $354.17/month. Finance fee = ($32,000 + $19,250) × 0.00125 ≈ $64.06/month. Pre-tax payment ≈ $418.23, and with 7% tax the total monthly payment is about $447.51.
What moves the payment most
- Residual value: a higher residual (the vehicle holds its value well) shrinks the depreciation fee, since less value needs to be paid off over the term.
- Money factor: multiply it by 2400 to see the rough equivalent APR — a money factor of 0.00125 is about 3%. Negotiating this down lowers the finance fee directly.
- Lease term: a longer term spreads depreciation over more months, lowering the monthly payment, but the finance fee accrues for longer, so total lease cost does not always drop proportionally.
- Down payment: reduces the adjusted cap cost and therefore both fees, but money put down on a lease is generally not recoverable if the vehicle is totaled early, so weigh that trade-off before putting more down.
Assumptions and limits
This calculator assumes tax is applied to the monthly payment, a common method but not universal — some states tax the full price up front or the down payment separately. It excludes acquisition fees, disposition fees, registration, and add-on products that a real dealer quote may include. Use it to sanity-check a lease worksheet, not as a substitute for the itemized figures a dealer or leasing company provides.