Leasing vs. Buying a Car: The Honest Math

The short version: A car lease is not a mysterious product. It is four numbers – the capitalised cost, the residual value, the money factor and the term – plus a mileage allowance, and every lease payment in America is those numbers run through the same short piece of arithmetic. Once you can reproduce the payment yourself, the salesperson’s “what monthly payment were you looking for?” stops working. The lower lease payment is not a discount; it is the result of paying for roughly a third of the car instead of all of it, and handing back the part you did not pay for. Leasing genuinely suits a narrow group: people who drive predictable, modest mileage, who want a new vehicle every three years, who can absorb the fees, and in some cases who get a tax advantage. For nearly everyone else, the cheapest years of car ownership are the ones after the loan is paid off, and a lease never reaches them.

The four numbers, and the arithmetic that joins them

Capitalised cost

The capitalised cost is the price of the car in the lease. Regulation M, the Consumer Leasing Act rule at 12 CFR Part 1013 administered by the Consumer Financial Protection Bureau, requires the lessor to disclose the gross capitalised cost, any capitalised cost reduction, and the resulting adjusted capitalised cost. The gross figure includes the agreed vehicle value plus anything else rolled in: the acquisition fee, an extended warranty, negative equity from a trade. The capitalised cost reduction is your cash down, trade allowance and rebates. This number is negotiable exactly as a purchase price is negotiable, and it is the single most commonly surrendered point in the transaction because buyers focus on the payment instead.

Residual value

The residual is the lessor’s estimate of the car’s wholesale value at the end of the term, usually expressed as a percentage of sticker price. It is set by the finance company, not the dealer, and it is not negotiable. It is also the reason two similar cars can lease very differently: a model that holds value well has a high residual, so there is less depreciation to pay for. A high residual lowers your payment and simultaneously makes the end-of-lease buyout less attractive, because you would be buying at a price the lender guessed optimistically.

Money factor

The money factor is the interest rate written as a small decimal. To convert it, multiply by 2,400. A money factor of 0.00250 is a 6.0 percent annual rate; 0.00125 is 3.0 percent. Regulation M requires the total rent charge to be disclosed, but not the rate, which is why this conversion matters. Dealers can mark up the money factor above the finance company’s buy rate, and the markup is invisible unless you do the multiplication.

Term and mileage

Term is straightforward; 36 months is the common case and it usually aligns with the bumper-to-bumper warranty, which is one of leasing’s real advantages. Mileage is where people get hurt. The Federal Trade Commission’s consumer guidance on financing or leasing a car notes that the annual mileage limit in most standard leases is 15,000 or less, and the Consumer Financial Protection Bureau puts the typical range at 10,000 to 15,000 miles per year. Estimate your own mileage from your last two years of service records rather than from optimism, and buy extra miles up front if you need them, since pre-purchased miles are normally cheaper than the overage rate and are refundable in some contracts if unused.

A worked example, and what each number is worth

Take a vehicle with a $40,000 sticker, negotiated to $37,000, with a $900 acquisition fee capitalised, $2,000 cash down, a 36-month term, a residual of 58 percent of sticker and a money factor of 0.00250.

Now change one thing at a time. Negotiate $1,000 off the price and the payment drops about $30. Get the money factor down from 0.00250 to 0.00175, a 4.2 percent rate, and it drops about $44. Move to a trim with a 62 percent residual and it drops about $40. Nothing else in the conversation moves the number that much. Note also that the rent charge is calculated on the capitalised cost plus the residual, not on a declining balance, which is why a lease at the same nominal rate as a loan is not directly comparable.

Mileage overage, wear, and the disposition fee

Exceed the allowance and you pay per mile at the end. Toyota Financial Services states that the excess mileage charge is typically $0.15 per mile on its leases. That is $1,500 on 10,000 extra miles, due in one lump at return. Regulation M at 12 CFR 1013.4 requires the lessor to state its standards for wear and use and specifies that they must be reasonable, and requires the notice that “You may be charged for excessive wear based on our standards for normal use.” Those standards are usually published as a brochure with a tyre-tread minimum and a coin-sized template for dents and scratches. A disposition fee, whose amount is disclosed in the contract, is charged when you hand the car back; it is often waived if you lease again from the same brand, which is precisely the point of it.

Gap coverage

Early in a lease you owe more than the car is worth, so a total loss leaves a gap between the insurance settlement and the lease payoff. Most manufacturer-captive leases include gap coverage in the contract. Check rather than assume, particularly on a credit union or bank lease, and do not pay separately for something you already have.

What you are actually trading, over ten years

The honest comparison is not one lease against one loan. It is a person who leases continuously against a person who buys and keeps. Consider a ten-year horizon using Experian’s State of the Automotive Finance Market figures for the second quarter of 2026, which put the average new-vehicle monthly loan payment at $765 on an average amount financed of $43,610.

The serial lessee buys certainty and newness; the buyer buys those payment-free years. Out-of-warranty repair costs are real and they are the buyer’s genuine risk, but they very rarely reach the cost of a permanent monthly payment.

The tax difference that varies by state

Where you live changes the arithmetic more than most people expect. Illinois, under Public Act 98-628 effective 1 January 2015 and explained in Department of Revenue publication ST-9-LSE, revised March 2025, computes tax on qualifying motor vehicle leases from the amount due at signing plus the total of the lease payments, rather than the lessor’s purchase price. Texas does the opposite: the Comptroller’s motor vehicle tax guide states that tax is imposed on the leasing company’s purchase of the vehicle and due at titling and registration, and that “No tax is due on the lease payments made by the lessee.” In a payment-taxed state, leasing shifts tax onto the portion of the car you actually use. In a state that taxes the full value up front, that advantage disappears. Business use is a separate question again, handled through different rules for leased and owned vehicles, and worth an hour with a tax professional rather than a rule of thumb.

The decision rule: if you will keep a vehicle beyond the end of its finance term, buy. If you replace vehicles every two to four years anyway, drive under the mileage allowance, and would otherwise trade in early and absorb depreciation as negative equity, lease – you are already paying for depreciation, and a lease at least prices it honestly.

Lease end

You have three options: return the car and pay the disposition fee and any excess mileage or wear charges; buy it at the contractual purchase option price, which was fixed at signing; or, in most cases, sell or trade it to a third party if the payoff is below market value. That third route is worth checking, because a residual set three years earlier can be wrong in your favour. Note also that the Consumer Leasing Act’s protections are not unlimited: the Consumer Financial Protection Bureau’s annual threshold adjustment set the Regulation M exemption at $73,400 for leases beginning 1 January 2026, so leases above that figure fall outside the disclosure rules.

The misconception: that leasing is throwing money away

This is the most repeated line about leasing and it is wrong in an instructive way. Depreciation is the main cost of operating a car, and you pay it whether you lease or buy. A buyer who sells at three years has also paid the depreciation; it was simply taken out of the resale price rather than billed monthly. What a lease actually does is transfer residual risk to the finance company. If the car is worth less than the residual at return, that is their loss. If it is worth more, that is their gain, and you gave up the upside.

The correct criticism of leasing is narrower and sharper. It is that a lease guarantees you never reach the cheap part of car ownership, and that the fees layered around it – acquisition, disposition, excess mileage, excess wear – are where the arrangement quietly costs more than the payment comparison suggests. A lease payment $200 below a loan payment is not $200 a month of saving once you count the acquisition fee, the disposition fee, and the fact that one of the two obligations eventually ends.

Two negotiation points people miss. First, negotiate the selling price before mentioning that you intend to lease, because the capitalised cost is derived from it. Second, ask for the money factor as a number and multiply it by 2,400 in front of the salesperson; a marked-up rate rarely survives being named out loud. And avoid large cash down payments on a lease – if the car is totalled in month two, that money is gone, because gap coverage protects the lender’s balance, not your equity.

Where these figures come from

Lease disclosure requirements, including gross and adjusted capitalised cost, residual value, rent charge and the wear-and-use standards language, are from Regulation M at 12 CFR Part 1013, section 1013.4, as published by the Consumer Financial Protection Bureau; the $73,400 exemption threshold effective 1 January 2026 is from the Bureau’s Regulation M threshold adjustment final rule published in the Federal Register in December 2025. Mileage-allowance ranges are from the Federal Trade Commission consumer advice page on financing or leasing a car and from the Consumer Financial Protection Bureau’s Ask CFPB answer on leasing versus buying, last updated 14 September 2023. The $0.15 per mile excess mileage figure is from Toyota Financial Services customer guidance. Average new-vehicle loan payment and amount financed are from Experian’s State of the Automotive Finance Market report for the second quarter of 2026. Lease taxation is from Illinois Department of Revenue publication ST-9-LSE, revised March 2025, and the Texas Comptroller of Public Accounts motor vehicle tax guide. The worked example is arithmetic, not a quoted offer.

General information, current as of September 2026, and not personalised financial advice.