Leasing vs. Buying a Car: Money Factor, Residual and Total Cost

Leasing and buying both pay for the same thing: the value the car loses while you drive it, plus the cost of borrowing. The difference is what you own at the end. A buyer finances the whole car and keeps whatever value remains; a lessee finances only the expected depreciation over the lease term and hands the car back.

That makes leasing vs. buying a car less a question of which is cheaper and more a question of how long you keep cars, how far you drive, and how much you value a lower payment versus long-term ownership. The math below shows where the costs actually diverge.

How is a lease payment calculated?

A lease payment has two main parts: a depreciation fee and a finance fee. Sales tax, where it applies to payments, is added on top.

• Depreciation fee = (capitalized cost − residual value) ÷ number of months.
• Finance fee = (capitalized cost + residual value) × money factor.

The capitalized cost is the price the lease is based on, after any cash down or rebate. The residual value is the lessor’s estimate of the car’s value at lease end. The money factor is the financing rate expressed as a decimal.

The finance fee formula looks odd at first because it adds the two values together. It works because it is a shortcut for charging interest on the average amount of money tied up in the car over the lease, which sits roughly halfway between the starting price and the residual.

What is a money factor, and how does it compare with an APR?

The money factor is the lease version of an interest rate. Multiplying it by 2,400 gives an approximate APR, so a money factor of 0.00250 is about 6%, and 0.00175 is about 4.2%.

That conversion lets you compare a lease offer with a loan offer on equal terms. If a lessor quotes only a monthly payment, ask for the money factor, the residual value and the capitalized cost. With those three numbers you can rebuild the payment yourself and see whether the financing portion is reasonable for your credit.

Some lessors allow a markup over their base money factor, similar to a dealer markup on a loan rate. Asking for the base figure is a normal part of negotiating.

Why does the residual value matter so much?

The residual sets how much depreciation you pay for. A higher residual means the car is expected to hold more of its value, so the depreciation fee is smaller.

Residuals are usually expressed as a percentage of the sticker price (MSRP) and depend on the model, the term and the mileage allowance. A lease with a lower mileage allowance typically carries a slightly higher residual, because the car is expected to come back with fewer miles. The residual is generally not negotiable, but the capitalized cost it is subtracted from is, and every dollar off the capitalized cost lowers both fees.

The residual also matters at the end. It is the basis for the purchase price if you decide to buy the car rather than return it.

Worked example: lease vs. loan on the same car

Assume a car with a $38,000 sticker price that you negotiate down to $36,000. Taxes, registration and dealer fees are left out of both options so the comparison is like-for-like.

The lease

Terms: 36 months, residual of 60% of MSRP, money factor 0.00250 (about 6% APR), 12,000 miles a year.

1. Residual value: $38,000 × 0.60 = $22,800.
2. Depreciation fee: ($36,000 − $22,800) ÷ 36 = $13,200 ÷ 36 = $366.67.
3. Finance fee: ($36,000 + $22,800) × 0.00250 = $58,800 × 0.0025 = $147.00.
4. Base monthly payment: $366.67 + $147.00 = $513.67.
5. Total over 36 months: $513.67 × 36 = $18,492.12.

You return the car and own nothing, so your three-year cost is $18,492.12, before any fees or overage charges.

The loan

Terms: $36,000 financed at 6% APR for 60 months, monthly payments.

1. Monthly rate: 6% ÷ 12 = 0.5%.
2. Payment: $36,000 × 0.005 ÷ (1 − 1.005^−60) = $695.98.
3. Paid in the first 36 months: $695.98 × 36 = $25,055.28.
4. Interest in those 36 months: $4,758.65, which leaves a balance of $15,703.37.
5. If the car is worth $22,800 at that point (the same value the lease assumed), your equity is $22,800 − $15,703.37 = $7,096.63.
6. Net three-year cost: $25,055.28 − $7,096.63 = $17,958.65.

The buyer’s three-year cost equals the $13,200 of depreciation plus $4,758.65 of interest. The lessee’s equals $13,200.12 of depreciation fees (the rounded $366.67 × 36) plus $5,292.00 in finance fees. At the same rate, buying comes out $533.47 lower here, mainly because the loan’s balance falls faster than the lease’s average financed amount.

Stretching the comparison to six years

The six-year gap of $9,225.44 comes almost entirely from the sixth year with no car payment and the value left in the car. It assumes the second lease costs the same as the first and ignores maintenance, which tends to be higher on an older car. Run your own figures in the lease vs. buy calculator.

How do mileage limits change the decision?

A lease sets an annual mileage allowance, and every mile above it is charged at a per-mile rate when you return the car. If you regularly drive more than the allowance, the overage can erase any savings.

In the table above, 4,500 extra miles at an illustrative $0.25 a mile adds $1,125. Buying extra miles at signing is often priced lower than paying the overage at the end, so estimating your mileage honestly matters. A buyer has no mileage limit, though high mileage still lowers the car’s resale value.

A quick way to estimate your miles is to check your current car’s odometer against a service record or inspection from a year ago, then add any known changes such as a longer commute or a planned move. Allowances are commonly offered in steps, so choosing the step just above your honest estimate usually costs less than paying overage. If your mileage is genuinely unpredictable, that uncertainty is itself a point in favor of buying.

Running costs are the same whichever way you pay. Fuel economy estimates from federal sources can help you compare the yearly fuel cost of two models before you choose either path.

What other costs make a lease more expensive than its payment?

The monthly payment leaves out several charges that appear at the start or the end of a lease:

• Acquisition fee at signing and disposition fee at return, unless waived.
• Excess wear and tear charges for damage beyond normal use, judged at turn-in.
• Early termination charges, which can be large, because the lessor expects to collect the full depreciation.
• Sales tax, which many states charge on each monthly payment instead of on the full price.

Federal consumer leasing disclosures require the lessor to show the amount due at signing, the monthly payment, and the total of payments. Comparing that total with a loan’s total of payments, after accounting for what you would own, keeps the decision grounded in dollars.

Does putting money down on a lease save money?

A cash payment at signing, called a capitalized cost reduction, lowers the monthly payment, but most of it simply prepays the depreciation you would otherwise pay monthly. The only real saving is the finance fee on the amount you put down.

Using the lease above, suppose you put $3,000 down:

1. New capitalized cost: $36,000 − $3,000 = $33,000.
2. Depreciation fee: ($33,000 − $22,800) ÷ 36 = $283.33.
3. Finance fee: ($33,000 + $22,800) × 0.00250 = $139.50.
4. New payment: $283.33 + $139.50 = $422.83, which is $90.84 lower.
5. Payment savings over 36 months: $90.84 × 36 = $3,270.24.

You spent $3,000 to save $3,270.24, a net gain of $270.24, which is essentially the finance charge on the $3,000 ($3,000 × 0.0025 × 36 = $270.00). The risk is on the other side: if the car is stolen or totaled in the first months, the insurance payout and any gap coverage settle the lease, but the $3,000 is generally not returned. That is why many lessees keep the amount due at signing to the first payment and required fees.

What happens at the end of a lease?

At lease end you typically have three choices: return the car, buy it, or trade it toward another vehicle. Each is worth comparing against the car’s actual market value at that moment.

• Return it. You pay any disposition fee, excess mileage and excess wear charges, and walk away.
• Buy it. The purchase price is based on the residual value plus any purchase option fee in the contract. If the car is worth more than that price, buying it captures the difference.
• Trade it. If the car’s market value exceeds the payoff, some lessors allow that equity to be applied to another vehicle, though policies on third-party buyouts vary.

Because the residual was set years earlier, the market may have moved in either direction. A car worth less than its residual is simply returned; one worth more is an asset you can use. A buyer faces the same market but keeps whatever value is there by default.

When does each option tend to fit?

Leasing tends to fit drivers who want a newer car every few years, drive a predictable number of miles below the allowance, keep cars in good condition, and prefer a lower monthly payment over building equity.

Buying tends to fit drivers who keep cars for many years, drive high mileage, want freedom to modify or sell at any time, or want to eventually have no car payment. A down payment lowers a buyer’s payment and interest; on a lease, money put down is mainly at risk if the car is totaled early.

A third route is paying cash. The lease vs. pay cash calculator weighs leasing against tying up savings in a purchase, and the car lease calculator rebuilds a lease payment from its parts.

Bottom line

A lease charges you for the car’s depreciation over the term plus a finance fee set by the money factor; a loan charges you for the whole car plus interest, then lets you keep what is left. Over three years the costs can be close, but keeping a purchased car for years after the loan is paid off is where buying usually pulls ahead. Before deciding, get the capitalized cost, residual value and money factor in writing, estimate your mileage realistically, and compare total cost, not monthly payment.