How to Calculate a Car Lease Rate and Monthly Payment

To calculate a car lease payment, add two monthly charges and then apply sales tax. The first is depreciation: the adjusted capitalized cost minus the residual value, divided by the number of months in the lease. The second is the rent charge: the adjusted capitalized cost plus the residual value, multiplied by the money factor. Sum those two numbers, add your state’s tax, and you have the monthly payment.

The arithmetic is simple once you have the right inputs. Pulling those inputs off the lease worksheet is the part most people skip, which is exactly why dealers can quote a payment that looks reasonable while hiding an inflated financing rate or a padded vehicle price.

Numbers You Need Off the Lease Worksheet

Federal law requires the lessor to disclose the figures that drive your payment. The Consumer Leasing Act, implemented through Regulation M, forces those disclosures so offers can be compared on equal footing.¹ Six numbers do the work:

Gross capitalized cost: the total value assigned to the vehicle plus anything rolled into the lease, including service contracts, insurance products, and any outstanding balance from a prior loan or lease.²
Capitalized cost reductions: anything that lowers that figure before the payment is calculated, such as your down payment, a trade-in credit, or a manufacturer rebate.²
Adjusted capitalized cost: gross capitalized cost minus your reductions. This is the figure the payment is actually built on.²
Residual value: what the leasing company projects the vehicle will be worth when the lease ends. It is set by the lessor, expressed as a percentage of MSRP, and must appear in your disclosures. A $40,000 MSRP with a 60% residual carries a residual value of $24,000.³
Money factor: a small decimal, often something like 0.00125, that represents the financing cost. It looks nothing like a traditional interest rate.
Lease term: the number of months in the contract, commonly 24, 36, or 48.

Watch for an acquisition fee, sometimes called a bank fee. It’s a flat charge from the leasing company, often several hundred dollars, that gets rolled into the gross capitalized cost and raises your monthly payment if you don’t pay it upfront. Not every dealer volunteers the number. Ask for an itemized breakdown of the gross capitalized cost if one isn’t on the sheet.

Step 1: The Monthly Depreciation Charge

Depreciation is the biggest piece of a lease payment. It represents the portion of the vehicle’s value you use up over the term. Subtract the residual value from the adjusted capitalized cost to get total depreciation, then divide by the number of months.

Take a vehicle with an adjusted capitalized cost of $35,000 and a residual value of $20,000. Total depreciation is $15,000. Over 36 months, that works out to $416.67 per month.

Because this line typically drives most of the payment, negotiating a lower vehicle price or choosing a model with a high residual has the largest effect on what you’ll pay each month.

Step 2: The Monthly Rent Charge

The rent charge is the financing fee, the leasing company’s return for tying up its capital while you drive the car. The formula is unusual: add the adjusted capitalized cost and the residual value, then multiply by the money factor.⁴

Using the same example: $35,000 + $20,000 = $55,000. With a money factor of 0.0015, the monthly rent charge is $55,000 × 0.0015 = $82.50. Unlike the depreciation charge, the rent charge stays flat for every month of the lease.

Converting the Money Factor to an APR

A money factor of 0.0015 means nothing on its own. To translate it into a figure you can compare against auto loan rates, multiply by 2,400. So 0.0015 × 2,400 = 3.6% APR. If a dealer quotes you an interest rate instead, divide by 2,400 to get the money factor.

This conversion is the only reliable way to tell whether the financing cost is competitive. A money factor of 0.00350 converts to 8.4% APR, well above typical new-car loan rates, and a signal to push back or shop elsewhere. The rent charge is where dealers have the most room to pad margin, and most buyers never check because the raw number looks like gibberish.

Step 3: Add Tax for the Total Monthly Payment

Combine the two charges to get the base payment. In the running example, $416.67 + $82.50 = $499.17.

Sales tax goes on top. Most states tax each monthly payment rather than the full vehicle price, which is one reason leasing can carry a tax advantage over buying. A handful of states charge tax upfront on the sum of all payments or on the full vehicle price, so check your state’s method before building a budget. Applying a 7% rate to the $499.17 base adds $34.94, bringing the total to $534.11.

That final number is what leaves your account each month. If the dealer’s quote is meaningfully higher than what you calculate, ask them to walk through the gap line by line. The difference is usually a fee or an add-on buried inside the gross capitalized cost.

Checking the Numbers Before You Sign

Running the math yourself is a cross-check, not a formality. Three places tend to hide extra cost:

The gross capitalized cost. Service contracts, dealer-installed accessories, and bank fees all land here. If the adjusted capitalized cost is higher than the price you thought you negotiated, something was rolled in.
The money factor. Convert it to an APR every time. A rate several points above prevailing auto loan rates deserves a direct question about why.
The residual value. You can’t negotiate it, but a low residual produces a high depreciation charge. Comparing residuals across similar vehicles is often a quicker route to a lower payment than haggling.

Once the three inputs look reasonable, the formula does the rest. Depreciation plus rent, times your state’s tax treatment, equals the payment. If your arithmetic lands within a few dollars of the dealer’s quote, the deal on the page is the deal you’ll pay. If it doesn’t, you have the numbers to ask why.