2026-03-14 · CalcBee Team · 8 min read
Car Loan vs Lease: The Complete Math Behind the Right Choice
The buy-versus-lease decision is one of the most consequential financial choices a car buyer faces, yet most people make it based on monthly payment alone. That is a mistake. The true cost of each option depends on depreciation, interest rates, mileage, ownership duration, and what you do with the vehicle at the end of the term. When you run the full math, the "cheaper" option is often not what you expect.
This guide walks through every calculation — from monthly payments to total cost of ownership — so you can make a data-driven decision. No salesperson spin, just the numbers.
How Car Loan Payments Work
A car loan is straightforward: you borrow money, pay it back with interest over a fixed term, and own the vehicle outright when the loan is paid off.
Monthly Loan Payment = [P × r × (1 + r)^n] ÷ [(1 + r)^n − 1]
Where:
- P = loan principal (vehicle price minus down payment and trade-in)
- r = monthly interest rate (annual rate ÷ 12)
- n = number of payments (loan term in months)
Loan Example
Vehicle price: $38,000
Down payment: $5,000
Trade-in value: $3,000
Loan amount: $30,000
Interest rate: 6.5% APR (0.5417% monthly)
Term: 60 months
Monthly payment: $587
Total payments over 60 months: $35,220
Total interest paid: $5,220
Vehicle value after 5 years (estimated): $16,000
Net cost of ownership: $35,220 + $5,000 down + $3,000 trade-in opportunity cost − $16,000 residual = $27,220
Use our car loan payment calculator to compute your exact monthly payment and total interest with different down payment amounts and interest rates.
How Lease Payments Work
Leasing is fundamentally different from buying. You are paying for the vehicle's depreciation during the lease term, plus a finance charge (money factor), plus taxes. You never own the vehicle — at the end of the lease, you return it or buy it at the predetermined residual value.
Monthly Lease Payment = Depreciation Fee + Finance Fee + Sales Tax
Where:
- Depreciation Fee = (Net Cap Cost − Residual Value) ÷ Lease Term in Months
- Finance Fee = (Net Cap Cost + Residual Value) × Money Factor
- Money Factor = approximate APR ÷ 2,400
Lease Example (Same Vehicle)
MSRP: $38,000
Negotiated cap cost: $36,000 (after $2,000 discount)
Down payment (cap cost reduction): $3,000
Net cap cost: $33,000
Residual value (36 months, 36,000 miles): $21,000 (55% of MSRP)
Money factor: 0.00250 (equivalent to 6.0% APR)
Term: 36 months
Depreciation fee: ($33,000 − $21,000) ÷ 36 = $333.33
Finance fee: ($33,000 + $21,000) × 0.00250 = $135.00
Monthly payment (before tax): $468.33
Monthly payment (with 7% tax): $501.11
Total lease payments over 36 months: $18,040
Plus down payment: $3,000
Total cost for 36 months of driving: $21,040
Vehicle ownership at end: None (car is returned)
Our lease payment calculator breaks down these components so you can see exactly what you are paying for.
Side-by-Side Total Cost Comparison
To make a fair comparison, we need to evaluate both options over the same time period. Let us compare over six years — two three-year lease cycles versus one six-year ownership period with a five-year loan:
| Cost Component | Buy (6-year ownership) | Lease (2 × 3-year terms) |
|---|---|---|
| Down payment | $5,000 | $3,000 × 2 = $6,000 |
| Monthly payments | $587 × 60 = $35,220 | $501 × 72 = $36,072 |
| Year 6 (loan paid off) | $0 (12 months free) | Included in 2nd lease |
| Vehicle value at end | $12,000 (sell/trade) | $0 (return car) |
| Net 6-Year Cost | $28,220 | $42,072 |
In this scenario, buying costs $13,852 less over six years. The key advantage: once the loan is paid off, you drive payment-free while still owning a vehicle worth $12,000.
But this comparison assumes you keep the purchased car for six years. If you trade in every three years — which many buyers do — the math shifts significantly in favor of leasing.
When Leasing Wins: The Three-Year Cycle
If you prefer driving a new car every three years, the comparison changes:
| Scenario (3-year period) | Buy and Trade | Lease |
|---|---|---|
| Down payment | $5,000 | $3,000 |
| Monthly payments (36 months) | $587 × 36 = $21,132 | $501 × 36 = $18,036 |
| Remaining loan balance at 36 months | $13,200 | $0 |
| Trade-in value at 36 months | $21,000 | N/A (return car) |
| Equity at trade-in | $21,000 − $13,200 = $7,800 | N/A |
| Net 3-Year Cost | $21,132 + $5,000 − $7,800 = $18,332 | $18,036 + $3,000 = $21,036 |
When you factor in equity from the trade, buying still edges out leasing by about $2,700 over three years. However, leasing offers lower monthly payments and no risk of the vehicle depreciating more than expected (depreciation risk is borne by the leasing company).
The Break-Even Analysis
The buy-vs-lease break-even point depends primarily on how long you keep the vehicle:
| Ownership Duration | Buy Net Cost | Lease Net Cost | Winner |
|---|---|---|---|
| 2 years | $17,100 | $15,026 | Lease |
| 3 years | $18,332 | $21,036 | Buy |
| 4 years | $21,568 | $28,048* | Buy |
| 5 years | $23,220 | $35,060* | Buy |
| 6 years | $28,220 | $42,072* | Buy |
| 8 years | $28,220 | $56,096* | Buy (by far) |
*Assumes lease renewal every 3 years at comparable terms.
The longer you keep a vehicle, the more decisively buying wins. The payment-free years after loan payoff accumulate savings rapidly. Conversely, for very short ownership periods (under three years), leasing can be more cost-effective because you avoid the steepest depreciation without being underwater on a loan.
Comparing Loan Terms: 60 vs 72 vs 84 Months
Longer loan terms reduce monthly payments but increase total interest and create the risk of being "upside down" (owing more than the vehicle is worth):
| Term | Monthly Payment | Total Interest | Equity at 36 Months |
|---|---|---|---|
| 60 months | $587 | $5,220 | $7,800 |
| 72 months | $506 | $6,432 | $3,420 |
| 84 months | $449 | $7,716 | −$180 (upside down) |
At 84 months, the buyer is actually underwater at the three-year mark — they owe more on the car than it is worth. This eliminates the flexibility to sell or trade without writing a check. Our 60 vs 72 vs 84 month loan calculator visualizes this equity curve so you can see exactly when you cross from underwater to positive equity.
Hidden Lease Costs to Watch
Mileage Penalties
Most leases allow 10,000 to 15,000 miles per year. Excess mileage charges typically range from $0.15 to $0.30 per mile. Driving 18,000 miles per year on a 12,000-mile lease means 18,000 excess miles over three years at $0.20/mile — a $3,600 penalty at lease return.
Use our lease mileage penalty calculator to estimate your potential exposure before signing a lease.
Wear-and-Tear Charges
Lease return inspections assess charges for damage beyond "normal wear and tear." Dents, scratches, worn tires, and interior stains can trigger fees of $500 to $2,000+. Purchased vehicles have the same wear, but you absorb it through reduced resale value rather than a lump-sum bill.
Disposition Fee
Most leasing companies charge a $300 to $500 disposition fee when you return the vehicle. This fee is buried in the lease contract and surprises many lessees at turn-in.
Gap Insurance
If a leased vehicle is totaled, you owe the remaining lease payments plus the residual value, minus what insurance pays. Gap insurance (often included in the lease but sometimes extra) covers this difference. Gap coverage typically adds $20 to $40 per month or a one-time fee of $500 to $700.
The Decision Framework
Use these criteria to guide your choice:
Choose buying if:
- You plan to keep the vehicle for 5+ years
- You drive more than 15,000 miles per year
- You want no restrictions on modifications or wear
- You want to eventually drive payment-free
- You prefer building equity in an asset
Choose leasing if:
- You want the lowest possible monthly payment
- You prefer a new car with the latest features every 3 years
- You drive fewer than 12,000 to 15,000 miles per year
- You want to be covered by the manufacturer warranty at all times
- The vehicle is for business use (leases may offer tax advantages)
Consider the lease buyout option if:
- You leased a vehicle that depreciated less than the residual value
- Used car prices are elevated, making your buyout price a relative bargain
- You want to avoid lease-return fees and mileage penalties
Our lease buyout calculator can help you determine whether purchasing your leased vehicle at the end of the term is a good deal versus returning it and starting fresh.
Run Your Own Numbers
The examples in this guide use national averages, but your situation is unique. Your interest rate, the specific vehicle's depreciation rate, your driving habits, and local tax rules all affect the outcome. The only way to make a truly informed decision is to calculate the total cost of both options with your specific numbers.
Start with our car loan comparison calculator to evaluate different financing scenarios, then compare against lease offers using the formulas above. The thirty minutes you spend on the math could save you thousands over the life of your next vehicle.
Category: Automotive
Tags: Car loan, Car lease, Buy vs lease, Auto financing, Monthly payment, Car depreciation, Vehicle purchase