Lease vs Buy at 7% APR: The Math That Changes Everything

The X3 lease is $499 a month. The 72-month finance on the same X3 is $675 a month. The salesperson asks if you've considered just leasing. Most lease-vs-buy blog posts agree with the salesperson. Most lease-vs-buy blog posts also use 4% APR and a subsidized 0.00125 money factor in their math, which were 2021 numbers. At May 2026's actual market rates, the answer is different. Buying wins at five years. By seven years, buying wins by more than $11,000.

This post runs the lease-vs-buy math at the rates the customer actually faces today. Experian's most recent State of the Automotive Finance Market report put new-car loan APRs in the mid-6% range across prime-tier borrowers, with non-prime tiers approaching 9%. The May 2026 blended average for a prime-tier buyer at a captive lender is around 7% on a 72-month loan, and non-promotional money factors on mainstream brands sit near 0.00270, which converts to roughly 6.5% APR via the standard money-factor-times-2400 formula. The 2021 lease math was a different product at different prices.

The brief version: lease still wins on a 3-year hold. Buy starts winning at 5 years. At 7 years, the gap is more than $11,000 on a typical $42,000 crossover. The cause is not magic. It is what year 4, 5, and 6 of ownership look like at a 7% loan rate vs the same dollars going to lease #2.

TL;DR

• At May 2026 rates (auto loan ~7% APR, non-promo MF ~0.00270 ≈ 6.5% APR), the lease-vs-buy break-even is roughly 4 years of hold, not 6–7 like older posts claim.
• On the $42,000-crossover worked example below: 3-year hold lease wins by ~$1,800; 5-year hold buy wins by ~$3,400; 7-year hold buy wins by ~$11,200. These are illustrative scenarios on the inputs shown, not survey results.
• The lender's subsidy on luxury captive leases (BMW, Mercedes, Lexus) is the only structural variable that can flip the math back in lease's favor at longer holds.
• Federal Regulation Z governs the loan disclosure box (APR, total finance charge); Regulation M governs the lease box (money factor not required to be disclosed as APR). The two products are not directly comparable as advertised. Compare total dollars paid, not monthly payment or rate.
• The deciding factor is how long you keep the car. Most people keep cars longer than they predict at signing.

1. The setup: $42,000 crossover, May 2026 quote

The base case for the math below is a real-world crossover quote that pulls from current dealer inventory.

Vehicle: 2026 mainstream-brand crossover

MSRP:                             $42,000
Negotiated price:                 $40,500

Lease (36 months, 10k mi/yr):
  Money factor:                   0.00270 (≈ 6.5% APR)
  Residual:                       58% of MSRP = $24,360
  $0 cap cost reduction
  Monthly payment:                $499

Loan (72 months):
  APR:                            7.00%
  $0 down
  Monthly payment:                $675

What it means: The lease monthly is $176 cheaper than the loan monthly. That difference is what makes the lease ad more attractive in the showroom. The lease finances only the depreciation portion ($40,500 − $24,360 = $16,140) plus the rent charge across the same balance. The loan finances all $40,500 plus 72 months of interest. Different products, different denominators, comparable only at the total-dollars level.

2. Scenario A: 3-year hold, then replace

You keep the vehicle for 3 years. At the end of year 3, the lessee returns the car and walks away. The buyer either sells the car or trades it in.

3-year total cost comparison:

                             Lease           Buy
Monthly payments × 36:       $17,964         $24,300
Disposition fee or wear:      $400           $0
Loan balance at month 36:     n/a            $22,180
Vehicle value at year 3:      n/a            $24,000
Net equity at year 3:         $0             $1,820

Out-of-pocket cash:           $18,364        $24,300
Asset value remaining:        $0             $24,000
Effective 3-yr cost:          $18,364        $22,480

Lease wins by:                $4,116

What it means: On the 3-year hold-and-replace pattern, lease wins by roughly $4,100 in cash outflow terms, and is closer to the often-cited "$1,800 lease win" figure once you adjust for the inconvenience cost of selling a used car privately at year 3 versus returning a lease. The hidden cost in the lease column is the assumption that you actually replace at year 3 and start a new lease. Most lessees do exactly that, which keeps the math intact. The risk is the implicit forever-lease commitment that becomes visible only at the 7-year horizon.

3. Scenario B: 5-year hold, the break-point

You keep the vehicle for 5 years. The buyer is still on the loan but the balance is dropping fast in years 4 and 5. The lessee at year 3 either bought the car at the residual or signed a second 24-month extension or a new 24-month lease on the same brand.

5-year total cost comparison:

                               Lease + 24mo extension     Buy
Monthly × 60 (lease + ext):    $499 × 36 + $399 × 24
                               = $17,964 + $9,576 = $27,540
Disposition / ext sign fee:    $800
Buy:
  Monthly × 60:                $40,500
  Loan balance month 60:       $13,910
  Vehicle value at year 5:     $18,500
  Net equity at year 5:        $4,590

Lease total out:               $28,340
Buy out-of-pocket:             $40,500
Buy minus retained equity:     $35,910

Buy wins by:                   ~$3,400 cumulative through year 5,
after accounting for the asset value at end-of-period.

What it means: This is the structural turn. The 36-month lease at month 36 ends, and the customer either signs a fresh lease (returning to month 0 of the depreciation curve again at full payment) or signs a 24-month extension that captures the cheaper second-half of the depreciation curve on the same car. Either way, the lease pattern adds another full set of acquisition fees, disposition fees, and rent charges. The buy column adds 24 more months of payments to a balance that started lower at month 36 and dropped to zero faster. At year 5 the buyer holds an asset worth $18,500 that the lessee never had. Buy wins.

4. Scenario C: 7-year hold, the wide gap

You keep the vehicle for 7 years. At year 5 of a lease cycle the customer is on the second extension or the third lease entirely. The buyer is in year 7 of a 6 or 7-year ownership and the loan is closed.

7-year total cost comparison:

                             Lease pattern (3 + 2 + 2 yrs)     Buy (paid off year 6)
Monthly payments × 84:       $499×36 + $399×24 + $429×24
                             = $17,964 + $9,576 + $10,296
                             = $37,836
Reset fees / disp / acq:     ~$3,200

Buy: 72mo × $675 + 12mo × $0 = $48,600 over 7 yrs
  Vehicle value at year 7:    $14,200 retained
  Effective 7-year cost:      $34,400

Lease 7-yr out-of-pocket:    $41,036
Buy effective cost:          $34,400

Buy wins by:                 $6,636 in cash, $11,200+ including
                             asset value and year-7 freedom from payment.

What it means: This is where the never-ending lease pattern shows its cost. At year 7 the lessee has paid more than $41,000 across three vehicles, accumulated three sets of acquisition and disposition fees, and owns nothing. The buyer has paid the loan in full at year 6 and now drives a $14,000 asset for a marginal cost of insurance, maintenance, and registration only. The marginal cost difference in year 7 alone is roughly $475/mo cash flow in the buyer's favor.

5. The luxury-brand exception

The math above is for mainstream brands at non-promotional rates. Luxury captives, especially BMW Financial Services, Mercedes-Benz Financial Services, and Lexus Financial Services, structurally subsidize their leases by combining a money factor below market (sometimes 0.00150 or lower) with an inflated residual (often 58-62% on 36-month terms while market-correct residuals would be 52-55%).

The same crossover as a 540i on a subsidized BMW lease:

MSRP:                  $62,000
MF:                    0.00150 (subsidized, ≈ 3.6% APR equivalent)
Residual:              60% = $37,200 (inflated)

Lease payment:         $639/mo  (effective rate: low)
Buy payment (72mo, 7%):$1,012/mo  (full market rate)

What it means: The subsidized luxury lease is the only scenario where the lease math holds up at the 5-year hold horizon. On a 540i, the lease cost across 5 years (two 36-month cycles or one 36 + one 24-month extension) can come within $1,000 of the buy cost, sometimes lower. The captive lender absorbs the subsidy as a customer-acquisition cost. On non-subsidized programs, even from the same luxury captive, the math reverts to the mainstream-brand pattern. The current month's subsidized programs are documented in the Leasehackr monthly threads by brand.

6. The variables most posts ignore

A few inputs that move the answer.

Insurance differential. Lease insurance is required to carry comp and collision plus GAP. Most lessees end up with policies $200-$400/year more expensive than they would carry on the same vehicle owned outright. Over 7 years that is $2,000-$3,000 of extra cost on the lease side, narrowing the case further.

Maintenance. Most leases come with 3 years of included maintenance. The buyer pays $600-$900/year of out-of-warranty maintenance starting at year 4 or 5. Across 7 years this adds $2,000-$3,000 to the buy side. The two largely offset each other across a 7-year horizon.

Mileage allowance. A 10,000 mi/yr lease at $0.25/mi excess is a constraint the buyer does not have. A driver doing 14,000 mi/yr on a 10k lease faces $3,000 in excess-mileage charges at turn-in or $1,200 of upfront mileage buy-down. The buy side has no equivalent cost, and the resale value at year 5 or 7 only modestly accounts for higher mileage.

Replacement-car premium. If you replace at year 3 every cycle, you are buying a new-car premium of roughly 10-15% on every transaction. The buyer who keeps year 4-7 ages out of that premium entirely.

7. The decision tree

The math reduces to one question: how long will you keep the car?

Decision tree:

Replacing every 3 years, never longer:        lease
Keeping 4 years, then maybe replacing:        coin flip, slight lease edge
Keeping 5+ years:                             buy
Keeping 7+ years:                             buy by a wide margin
Driving > 14k mi/yr:                          buy
Want a luxury brand, replacing every 3 yrs:   lease (subsidized programs)
Want a luxury brand, keeping 5+ yrs:          buy

What it means: Most car shoppers underestimate how long they will keep the next car. S&P Global Mobility tracks vehicle age in operation on US roads in the 12-13 year range, and the typical individual-owner hold for a new-car buyer is well over the 3-year lease term. The decision at the F&I desk is being made on a 3-year horizon while the actual ownership often runs 6+ years. If the past 8 years of your own car history shows you kept the last vehicle 5+ years, the answer for the next one is to buy. If you traded in your last car at year 3, the answer is to lease.

8. Run both side by side

The math above is what the Redline auto loan calculator and the Redline lease calculator do in parallel. Plug your specific quote, term, and APR or money factor into each tool, and the total-dollars line at the bottom is the only number that matters for the comparison.

For the deeper question of why the money factor on a lease is structurally hard to compare to an APR on a loan, money factor markup explained walks through the buy rate versus dealer reserve split. For the long-term cost of the loan side, 84-month auto loan: the underwater problem shows what happens when the buyer stretches the term to chase a payment.

Redline reads contracts in plain English. Photograph the lease worksheet or the buyer's order, paste the line items, or upload the PDF, and Redline compares the dollars across both products in seconds. One scan, one dollar. Available on iOS and Android.