How the Monthly Payment Formula Works
Monthly payment = depreciation fee + finance fee + tax. The depreciation fee covers the portion of the car’s value used during the lease. The finance fee is the cost of borrowing.
Depreciation fee = (Cap Cost − Residual Value) ÷ Term in months
Finance fee = (Cap Cost + Residual Value) × Money Factor
Monthly pretax = Depreciation + Finance
Example: $35,000 Car, 36-Month Lease
MSRP $35,000, negotiated to $33,000, $2,000 down, $1,000 in fees, 55% residual ($19,250), MF 0.0025, 36 months. Cap cost = $32,000. Depreciation = ($32,000 − $19,250) ÷ 36 ≈ $354/mo. Finance = ($32,000 + $19,250) × 0.0025 ≈ $128/mo. Total ≈ $482/mo before tax.
What Actually Moves the Number
Negotiate the selling price (cap cost), not the monthly payment — every $1,000 off saves about $28/mo on a 36-month lease. Residual value is set by the manufacturer and can’t be negotiated, but high-residual vehicles cost less to lease relative to MSRP. Money Factor × 2,400 ≈ APR — ask for the current MF before signing.
Leasing vs. Buying: The Actual Math
Leasing has lower monthly payments but you own nothing at the end. Over 9 years: two 3-year leases at $480/mo = $51,840, zero equity. Buying a $35,000 car at 5% over 5 years costs roughly $37,400 total, then 4 payment-free years. If you drive the same car for 8+ years, buying wins on total cost in nearly every scenario.