Leasing a vehicle can be more complex than a traditional auto loan. Unlike a purchase, where you pay for the entire value of the car, a lease only charges you for the depreciation of the vehicle during the time you drive it, plus finance charges and taxes.
Key Components of a Lease
Gross Capitalized Cost: This is the agreed-upon price of the vehicle. Just like buying, you can often negotiate the sales price below the MSRP.
Residual Value: This is what the car is expected to be worth at the end of your lease. It is usually set by the manufacturer as a percentage of the MSRP. A higher residual value leads to lower monthly payments.
Money Factor: This is essentially the interest rate for a lease. To convert a Money Factor to APR, multiply it by 2400. To convert APR to Money Factor, divide it by 2400.
Depreciation Fee: This is the (Net Capitalized Cost – Residual Value) / Lease Term. It covers the loss in value of the car.
Calculation Example
If you negotiate a car with an MSRP of $35,000 down to $32,000, put $2,000 down, and the residual is 60% ($21,000) for 36 months:
Net Cap Cost: $32,000 – $2,000 = $30,000.
Depreciation: ($30,000 – $21,000) / 36 = $250.00 per month.
Always focus on the "Sales Price" or "Cap Cost" rather than just the monthly payment. Dealerships can often hide higher interest rates or fees behind a monthly number. Additionally, aim for vehicles with high residual values (typically Japanese luxury brands or certain electric vehicles) as they retain value better, resulting in lower depreciation costs for you.
function calculateLease() {
var msrp = parseFloat(document.getElementById("msrp").value);
var salesPrice = parseFloat(document.getElementById("salesPrice").value);
var downPayment = parseFloat(document.getElementById("downPayment").value) || 0;
var tradeIn = parseFloat(document.getElementById("tradeIn").value) || 0;
var residualPercent = parseFloat(document.getElementById("residualPercent").value);
var leaseTerm = parseFloat(document.getElementById("leaseTerm").value);
var interestRate = parseFloat(document.getElementById("interestRate").value);
var taxRate = parseFloat(document.getElementById("taxRate").value) || 0;
if (isNaN(msrp) || isNaN(salesPrice) || isNaN(leaseTerm) || leaseTerm <= 0) {
alert("Please enter valid numeric values.");
return;
}
// 1. Calculate Net Capitalized Cost
var netCapCost = salesPrice – downPayment – tradeIn;
// 2. Calculate Residual Value
var residualValue = msrp * (residualPercent / 100);
// 3. Monthly Depreciation
var monthlyDepreciation = (netCapCost – residualValue) / leaseTerm;
if (monthlyDepreciation < 0) monthlyDepreciation = 0;
// 4. Money Factor Calculation (APR / 2400)
var moneyFactor = interestRate / 2400;
// 5. Monthly Rent Charge (Interest)
// Formula: (Net Cap Cost + Residual Value) * Money Factor
var monthlyRent = (netCapCost + residualValue) * moneyFactor;
// 6. Base Monthly Payment
var basePayment = monthlyDepreciation + monthlyRent;
// 7. Monthly Tax
var monthlyTax = basePayment * (taxRate / 100);
// 8. Total Monthly Payment
var totalMonthly = basePayment + monthlyTax;
// Display Results
document.getElementById("monthlyTotal").innerText = "$" + totalMonthly.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById("depreciationPart").innerText = "$" + monthlyDepreciation.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById("rentPart").innerText = "$" + monthlyRent.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById("residualValueAmount").innerText = "$" + residualValue.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById("taxTotal").innerText = "$" + (monthlyTax * leaseTerm).toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
document.getElementById("leaseResult").style.display = "block";
}