Lease vs Buy a Car in 2026: The Rate the Law Won’t Let You See, and What to Compare Instead

Every page you will read about lease vs buy a car was written by someone who sells you one of the two. Credit unions and banks publish the “leasing vs buying” explainer because they write auto loans. Dealership blogs publish it because a lease brings you back in thirty-six months. I sell neither: I build a mileage and vehicle app, so the only thing I care about is that the numbers you record afterwards are real.

That neutrality turns out to matter more than usual here, because of something the comparison guides almost never mention. The two options are governed by the same federal statute — and that statute requires the loan to show you a rate while forbidding the lease from showing you one. Not “lenders don’t bother”. Forbidden, in writing, in the regulation. Which means the single number everybody instinctively reaches for to compare the two does not legally exist on one side of the comparison.

So this guide does two things. First, it shows you exactly what the law does force the dealer to put in front of you, because that list is the real comparison and most people sign it without reading it. Second, it goes through what changes if you drive the car for work — where lease and buy stop being a matter of preference and start being a matter of IRS rules that are easy to get wrong once and then be stuck with for the whole lease.

The rule nobody quotes: a loan must show a rate, a lease may not

When you finance a car, the Truth in Lending Act requires the lender to disclose, among other things:

“The ‘finance charge’ expressed as an ‘annual percentage rate’, using that term.”

— 15 U.S.C. § 1638(a)(4)

That is the APR. It exists because Congress decided borrowers cannot compare offers without one standardized number.

Now the lease side. Consumer leases are covered by Regulation M, and its section on rate information reads:

“If a lessor provides a percentage rate in an advertisement or in documents evidencing the lease transaction, a notice stating that ‘this percentage may not measure the overall cost of financing this lease’ shall accompany the rate disclosure. The lessor shall not use the term ‘annual percentage rate,’ ‘annual lease rate,’ or any equivalent term.”

— 12 CFR § 213.4(s)

Read that twice. A lessor is not required to give you a rate at all. If they choose to give you one anyway, they must attach a warning that it may not measure the cost, and they are prohibited from calling it an annual percentage rate or any equivalent term.

Here is the part that makes it strange rather than merely inconvenient: these are not two different laws that happen to disagree. Regulation M itself states that “the Consumer Leasing Act is chapter 5 of the Truth in Lending Act” (§ 213.2(a)). One statute. It mandates a comparable rate for credit and blocks one for leases.

The regulation is even explicit that comparison is the goal. Its stated purpose is to ensure lessees “receive meaningful disclosures that enable them to compare lease terms with other leases and, where appropriate, with credit transactions” (§ 213.1(b)(1)). The law wants you to compare a lease against a loan, and simultaneously denies you the one metric that would make that comparison arithmetic.

This is why “the dealer wouldn’t tell me the interest rate on my lease” is not a story about a shady dealer. It is the regulation working as written.

What you get instead of a rate

You get a dollar amount called the rent charge, which Regulation M describes as “the amount charged in addition to the depreciation and any amortized amounts” (§ 213.4(f)(6)). It is the lease’s equivalent of total interest, expressed in dollars over the whole term rather than as a rate per year.

That is genuinely usable — arguably more honest than a percentage, since it is the actual money. It just cannot be compared to an APR without doing the conversion yourself, and the conversion is not on the paperwork.

What legally counts as a “lease” in the first place

Regulation M applies to a consumer lease, defined as a contract:

“for the use of personal property by a natural person primarily for personal, family, or household purposes, for a period exceeding four months and for a total contractual obligation not exceeding the applicable threshold amount, whether or not the lessee has the option to purchase or otherwise become the owner of the property at the expiration of the lease.”

— 12 CFR § 213.2(e)(1)

Three conditions hide in there, and each one is a way the protections can simply not apply to you.

Four months. Anything shorter is not a consumer lease. Short-term rentals are a different world.

A natural person, for personal purposes. More on this below — it is the biggest gap in the whole scheme.

Under the threshold amount. This is the one almost nobody knows about.

The $73,400 line

The threshold is adjusted every January against the CPI-W and rounded to the nearest $100. The official staff commentary lists it year by year. For leases consummated on or after January 1, 2026 through December 31, 2026, the threshold amount is $73,400.

If the total contractual obligation on your lease exceeds $73,400, the lease is exempt from Regulation M. No required payment-calculation breakdown, no mandated early-termination warning, no standardized wear-and-use notice. The disclosure regime you are counting on switches off.

Note that “total contractual obligation” is not the sticker price of the car — it is what the contract obligates you to pay. But on a long term with a large vehicle it is not an exotic number to reach.

One more detail worth knowing, straight from the commentary: if a lease is exempt because it exceeded the threshold at signing, “the lease remains exempt regardless of a subsequent increase in the threshold amount.” The exemption attaches at consummation and never wears off.

If you lease through your business, the consumer protections do not exist

This is the finding I did not expect, and it is stated flatly in the definition:

“It also does not include a lease for agricultural, business, or commercial purposes or a lease made to an organization.”

— 12 CFR § 213.2(e)(2)

Every disclosure discussed in this article — the payment calculation, the early termination warning, the excess mileage disclosure, the wear standard that must be reasonable — is a consumer protection. Put the lease in the company’s name, or sign it for business purposes, and Regulation M does not apply to the transaction.

That does not make a business lease a bad idea. It does mean the paperwork protections you assume are automatic are not, and the contract itself is the only thing standing between you and the terms. Read it accordingly.

There is a symmetric quirk on the other side. A “lessor” under the act is someone who leases “more than five times in the preceding calendar year or more than five times in the current calendar year” (§ 213.2(h)). Lease a car from a small operation that does it four times a year and they are not a lessor under the act.

The nine lines the dealer must show you, and which one you can move

For a motor-vehicle lease, § 213.4(f) requires “a mathematical progression of how the scheduled periodic payment is derived”. This is the box on the lease that most people’s eyes slide past. It is the whole deal, in order:

Line	What it is (Regulation M’s own description)
Gross capitalized cost	The agreed upon value of the vehicle plus anything you pay for over the term — service contracts, insurance, any outstanding prior credit or lease balance
Capitalized cost reduction	Net trade-in allowance, rebate, noncash credit, or cash you pay that reduces the gross cap cost
Adjusted capitalized cost	“The amount used in calculating your base [periodic] payment”
Residual value	“The value of the vehicle at the end of the lease used in calculating your base [periodic] payment”
Depreciation and amortized amounts	Adjusted cap cost minus residual — “the amount charged for the vehicle’s decline in value through normal use”
Rent charge	“The amount charged in addition to the depreciation and any amortized amounts”
Total of base periodic payments	Depreciation and amortized amounts plus the rent charge
Lease payments	The number of payments
Base periodic payment	The total divided by the number of periods

Read top to bottom it tells you something useful: your payment is mostly the gap between two numbers, the adjusted capitalized cost and the residual value. Everything else is arithmetic on that gap.

Which is why the negotiation advice that actually follows from the regulation is narrow:

• Gross capitalized cost is negotiable. It is “the amount agreed upon by the lessor and the lessee as the value of the leased property” (§ 213.2(f)). Agreed upon. That is the price of the car, and it moves.
• Residual value is not yours to set. The lessor sets it, and a higher residual means a lower payment — which is why a car with a strong residual leases cheaply and one that depreciates hard does not, regardless of sticker price.
• The rent charge is where the margin hides, and it is the number that has no rate attached to it by law.

You also have a right most people never exercise: the gross capitalized cost disclosure must include “a statement of the lessee’s option to receive a separate written itemization of the gross capitalized cost”, and if you ask, “the itemization shall be provided before consummation.” You can require them to break down, in writing, before you sign, everything they folded into that number.

Closed-end vs open-end: which lease are you actually signing

Regulation M draws a line between two kinds of lease, and the difference is who eats the error if the car is worth less than predicted at the end.

An open-end lease is one where “the lessee’s liability at the end of the lease term is based on the difference between the residual value” and what the car actually turns out to be worth. A closed-end lease is defined simply as any consumer lease that is not open-end (§ 213.2(d)).

Nearly every consumer car lease is closed-end: you hand back the keys and the lessor takes the depreciation risk. Open-end leases show up more in commercial and fleet arrangements — and remember from above that a business lease is outside Regulation M entirely.

If you do end up on an open-end lease, the law gives you a specific and rather sharp protection. There is a rebuttable presumption that the estimated residual value was unreasonable and not in good faith to the extent it exceeds the realized value by more than three times the base monthly payment — and where that presumption applies, the lessor “cannot collect the excess amount unless the lessor brings a successful court action and pays the lessee’s reasonable attorney’s fees” (§ 213.4(m)(2), tracking 15 U.S.C. § 1667b(a)).

Three times the monthly payment is the cap on how badly a bad residual estimate can land on you, unless they sue and win. There is one carve-out, and it is the one to watch: the presumption does not apply where the excess is “due to unreasonable or excessive wear or use of the leased property.”

That carve-out points straight at the two charges that generate most of the disputes.

Excess mileage: the one charge the law makes them quantify up front

Buried in the maintenance-responsibilities section is the disclosure that matters most to anyone who drives more than average. In a motor-vehicle lease, § 213.4(h)(3) requires a notice headed “Excessive Wear and Use”, telling the lessee they may be charged for excessive wear judged against the lessor’s “standards for normal use” — and then the regulation adds that the notice “shall also specify the amount or method for determining any charge for excess mileage“.

So the per-mile overage charge is not something the lessor can leave vague and settle at the end. It has to be on the paperwork, as an amount or as a stated method, before you sign.

That makes the mileage allowance the most tractable variable in the entire lease, because it is the only one where you can do the arithmetic yourself in advance:

1. Find your annual allowance in the contract.
2. Find the excess mileage charge that § 213.4(h)(3) requires them to state.
3. Multiply your honest annual mileage minus the allowance by that charge.

Step three is where it goes wrong, and not because the arithmetic is hard. People estimate their annual mileage, and the estimate is usually low. The commute is easy to add up; the errands, the weekend trips, the year you helped someone move — those are the miles that turn into a four-figure bill at return.

If you already have a real record of how much you drive, this decision takes ninety seconds and is close to risk-free. If you are guessing, you are guessing on the one lease term that compounds every single month. I built the trip log in Magica largely for the tax side of this problem, but the lease-allowance use is the same data answering an easier question: how many miles do I actually do in a year, not how many do I think I do.

Excessive wear has a legal standard, and it is “reasonable”

The lessor sets the wear standard, but not freely. Regulation M requires “a statement of the lessor’s standards for wear and use (if any), which must be reasonable” (§ 213.4(h)(2)).

That single word is a constraint on the return inspection. So is the record you can bring to it: documented maintenance is the difference between “the tires were worn out” and “the tires were replaced at 34,000 miles, here is the invoice.” Keeping a maintenance log matters at lease return for exactly the reason it matters at resale — the charge is assessed against a standard, and standards are argued with evidence.

Early termination: “may be up to several thousand dollars”

Regulation M does not leave the early-termination warning to the lessor’s phrasing. It writes it for them. The notice in a motor-vehicle lease must be substantially similar to:

“Early Termination. You may have to pay a substantial charge if you end this lease early. The charge may be up to several thousand dollars. The actual charge will depend on when the lease is terminated. The earlier you end the lease, the greater this charge is likely to be.”

— 12 CFR § 213.4(g)(2)

When a federal regulator writes the sentence “may be up to several thousand dollars” into mandatory boilerplate, it is because that is the real range.

There is a limit on it. Both the regulation and the statute require the charge to be reasonable — and the statute says what reasonable is measured against:

“Penalties or other charges for delinquency, default, or early termination may be specified in the lease but only at an amount which is reasonable in the light of the anticipated or actual harm caused by the delinquency, default, or early termination, the difficulties of proof of loss, and the inconvenience or nonfeasibility of otherwise obtaining an adequate remedy.”

— 15 U.S.C. § 1667b(b)

This is the practical asymmetry against a loan. A financed car can be sold at any point: you settle the loan out of the proceeds and you are done, cleanly, at market price. A lease is a term commitment with a penalty structure attached to leaving it. If there is any real chance your circumstances change inside three years — a move, a job change, a second child, a company car appearing — that difference is worth more than the monthly payment gap that usually drives the decision.

The appraisal right almost nobody uses

If your liability at termination depends on what the car is actually worth, you can force an independent valuation:

“If a lease has a residual value provision at the termination of the lease, the lessee may obtain at his expense, a professional appraisal of the leased property by an independent third party agreed to by both parties. Such appraisal shall be final and binding on the parties.“

— 15 U.S.C. § 1667b(c)

Final and binding — on them as well as you. You pay for it, and the number replaces theirs.

Buying: the trade you are actually making

Against all of that, buying is structurally simple, and its costs are simple too. You take the depreciation instead of renting it, you take the maintenance risk once the warranty ends, and you get an asset you can sell on any day of the week at a price the market sets rather than a residual someone estimated three years ago.

The honest framing is not “leasing is throwing money away.” A lease is a way of paying for the depreciation you use plus a rent charge, with someone else carrying the resale risk. Buying is paying for all of the depreciation and keeping the resale upside. Which is better depends on how long you keep cars, how many miles you drive, and how much you value not thinking about it.

What buying really gives you is optionality. No mileage ceiling, no wear standard, no termination penalty, no return inspection. If your driving is unpredictable, that is worth a lot, and none of it appears in a monthly payment comparison. If you want the actual cost of ownership rather than the payment, that is a cost per mile calculation, and it is the only figure that puts the two side by side fairly. And if the alternative you are weighing is a used purchase rather than a new one, the real-cost checklist for buying used is a different exercise again.

If you drive for work, the decision changes shape

Everything above applies to anybody. Below is where lease and buy genuinely diverge, and where a decision made casually in a dealership locks in a tax treatment for years.

The lease trap in Publication 463

The IRS lets you deduct business car use two ways: the standard mileage rate, or actual expenses. For an owned car you can switch between them under certain conditions. For a leased car you cannot:

“If you want to use the standard mileage rate for a car you lease, you must use it for the entire lease period.”

— IRS Publication 463

There is a second lock on the same page: you must make the choice “by the due date (including extensions) of your return”, and you are barred from the standard mileage rate later if you “claimed actual car expenses after 1997 for a car you leased.”

So on a leased car the method you pick in year one is the method you have in year three, whatever happens to fuel prices, your mileage, or the rate. On an owned car that decision is far less permanent. If you drive for work, this is a real and underrated difference between the two options — and it is decided by a checkbox on a return, not by anything the dealer says.

Note also what choosing the standard mileage rate costs you: for that year “you can’t deduct depreciation, lease payments, maintenance and repairs, gasoline (including gasoline taxes), oil, insurance, or vehicle registration fees.” On a lease, that includes the lease payments themselves.

The inclusion amount: how the IRS denies you depreciation

Lease a car for business and deduct actual expenses, and you may have to reduce that deduction by an inclusion amount. Publication 463 explains what it is for with unusual candor:

“To do this, you don’t add an amount to income. Instead, you reduce your deduction for your lease payment. (This reduction has an effect similar to the limit on the depreciation deduction you would have on the vehicle if you owned it.)”

That parenthesis is the whole logic of leasing-versus-buying in tax terms. Owners face caps on how fast they can depreciate an expensive car. Lessees would otherwise route around those caps by deducting the lease payment, so the inclusion amount claws back the difference.

The mechanics worth knowing:

• It applies to a lease term of 30 days or more.
• It applies only if the vehicle’s fair market value when the lease began was above a threshold: for leases beginning in 2024–2025, $62,000. Below that, no inclusion amount.
• FMV is measured on the first day of the lease term — and here the two legal regimes touch in a genuinely useful way: “If the capitalized cost of a car is specified in the lease agreement, use that amount as the FMV.” The number Regulation M forces the dealer to disclose is the number the IRS tells you to use.

One more line from the same section, aimed squarely at a common arrangement: “You can’t deduct any payments you make to buy a car, truck, or van even if the payments are called ‘lease payments.'” A lease-to-own dressed as a lease does not get lease treatment.

And a rule that quietly excludes a lot of small operations from the simple method: “If you own or lease five or more cars that are used for business at the same time, you can’t use the standard mileage rate for the business use of any car.”

2026 has two mileage rates, and your log has to know the date

This one is current and easy to get wrong, because it has only happened a handful of times. The IRS changed the standard mileage rate mid-year:

Period	Business use (cents/mile)	Source
January 1 – June 30, 2026	72.5	IR-2025-128
July 1 – December 31, 2026	76	IR-2026-29

A single annual mileage total is not deductible at either rate. The miles have to be split at June 30, which means your record has to carry dates, not just distances. Anyone reconstructing a year from memory in April has no way to do that split honestly. The guide to the 2026 IRS rates covers the deduction mechanics in more detail.

What the IRS actually accepts as a record

Publication 463 is direct about the standard, and about the fact that a phone qualifies:

“You can’t deduct amounts that you approximate or estimate.”

“You must generally prepare a written record for it to be considered adequate. This is because written evidence is more reliable than oral evidence alone. However, if you prepare a record on a computer, it is considered an adequate record.“

And on timing:

“You should record the elements of an expense or of a business use at or near the time of the expense or use… A timely kept record has more value than a statement prepared later when there is generally a lack of accurate recall. … If you maintain a log on a weekly basis that accounts for use during the week, the log is considered a timely kept record.”

Weekly is enough. Reconstructed-in-April is not. That is the entire requirement, and it is the same whether you lease or buy — which is worth saying plainly, because the tax question people ask about leasing (“can I write off a lease?”) matters much less than the substantiation question they don’t ask. There is more on the practical side of this in the small business mileage guide.

A European note, because the words don’t travel

If you have read about “long-term car leasing” in a European context, or you are comparing notes with someone there, be careful: the product is different. What Europe calls long-term rental — noleggio a lungo termine in Italy, renting in Spain — is typically an all-inclusive monthly fee that bundles insurance, road tax, scheduled maintenance and roadside assistance, with no purchase option at the end. An American closed-end lease bundles none of that; insurance and maintenance stay yours.

That product has a separate analysis here — long-term leasing versus purchase — written for that market and using its numbers. Same English word, different contract — don’t import conclusions from one to the other.

So: lease or buy?

The decision framework that survives all of the above is short, because most of the usual advice collapses into two questions the paperwork can answer.

Your situation	What the rules say points where
You drive more miles than the allowance, or you genuinely don’t know your annual mileage	Buy, or find out your real number first — excess mileage is the charge that compounds every month
You keep cars a long time	Buy — you stop paying once the loan ends; a lease has no end state that leaves you with an asset
There’s a real chance you’ll need out within the term	Buy — a financed car can be sold at market on any day; a lease has a penalty structure
You want a predictable payment and a new car every three years, and your mileage is stable and known	Lease — this is what it is designed for, and the residual risk is genuinely someone else’s
The vehicle is for business	Decide the tax method first, not the payment — on a lease that choice is locked for the entire lease period
Total contractual obligation over $73,400	Read every clause: Regulation M’s disclosure protections don’t apply

And the meta-rule, which is the reason this article exists: do not try to compare a lease and a loan on rate. You cannot, because the law that requires the loan to state an APR forbids the lease from stating one. Compare the total of payments against the total cost of financing plus expected depreciation, compare the mileage ceiling against your real mileage, and compare the exit terms. Those three are all disclosed, all comparable, and all more decisive than the monthly payment that the sales conversation will orbit around.

Where Magica fits, honestly

I am not going to claim an app decides this for you. Two of the inputs above are things it does supply, and it is worth being precise about which:

• Your real annual mileage, from a trip log rather than a guess — the number that determines whether the lease allowance is comfortable or expensive, and the number the IRS wants dated and timely if the driving is for work.
• A maintenance and cost history, which is what you bring to a return inspection where the wear standard has to be reasonable, and what feeds a genuine cost-per-mile comparison between keeping a car and replacing it every three years.

Magica logs trips automatically, keeps the fuel and service history, and exports IRS-compliant reports for your accountant. The 2026 split-rate problem is handled by the fact that trips are dated records rather than a running total.

It is also worth saying where the data lives, since I keep telling you to record more of it: everything is encrypted on the device and backed up to your own iCloud. There is no Magica server holding your driving history, which is the same principle behind how the app treats trip data generally.

Frequently asked questions

Why won’t the dealer tell me the interest rate on a lease?

Because Regulation M forbids the phrasing. Under 12 CFR § 213.4(s) a lessor “shall not use the term ‘annual percentage rate,’ ‘annual lease rate,’ or any equivalent term”, and any percentage rate they do show must carry a notice that “this percentage may not measure the overall cost of financing this lease.” What they must disclose instead is the rent charge in dollars.

Is leasing cheaper than buying?

Month to month, usually yes, because you are paying for part of the car’s depreciation rather than all of it. Over a long enough horizon, buying almost always wins, because payments end and the car is still worth something. The comparison only becomes real when you include the charges that don’t appear in the monthly payment: excess mileage, excessive wear, and early termination.

What happens if I go over the mileage on my lease?

You pay the excess mileage charge stated in the contract. Regulation M requires the lease to specify “the amount or method for determining any charge for excess mileage” (§ 213.4(h)(3)), so the number is disclosed before you sign — which means the overage is calculable in advance if you know your real annual mileage.

Can I get out of a car lease early?

You can terminate, but there is a charge, and the regulation’s own mandatory warning says it “may be up to several thousand dollars” and grows the earlier you leave. The charge must be reasonable in light of the actual harm caused (15 U.S.C. § 1667b(b)), but reasonable is not small.

Can I write off a leased car for business?

Yes, using either the standard mileage rate or actual expenses. The catch specific to leases: if you choose the standard mileage rate you must use it for the entire lease period, and if the vehicle’s fair market value at lease start was above the threshold ($62,000 for leases beginning in 2024–2025) an inclusion amount reduces your deduction under the actual expense method.

Does leasing through my business give me more protection?

Less, not more. Regulation M explicitly excludes “a lease for agricultural, business, or commercial purposes or a lease made to an organization” (§ 213.2(e)(2)). The mandated disclosures and the reasonableness standards are consumer protections; a business lease is governed by its contract.

Is a lease with a purchase option still a lease?

Yes. The definition applies “whether or not the lessee has the option to purchase or otherwise become the owner of the property at the expiration of the lease” (§ 213.2(e)(1)). For tax purposes, though, note that the IRS will not let you deduct payments made to buy a vehicle “even if the payments are called ‘lease payments'”.

What mileage records does the IRS actually require?

A written record, prepared at or near the time of use. Publication 463 states you “can’t deduct amounts that you approximate or estimate”, and confirms that a record prepared on a computer counts as adequate. A log maintained weekly is explicitly accepted as timely kept. In 2026 the record also needs dates, because the rate changed from 72.5 to 76 cents per mile on July 1.

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Sources: Truth in Lending Act, 15 U.S.C. § 1638 and §§ 1667a–1667b; Regulation M, 12 CFR Part 213 and its official staff commentary; IRS Publication 463 (2025); IRS standard mileage rates (IR-2025-128, IR-2026-29). This is general information about how the disclosure rules work, not legal or tax advice for your situation.