“Should I lease or own?” is often framed as a payment question, but it is really a value question. A lease payment covers the value the car is expected to lose during the term, plus a finance charge and tax — the residual value set up front is the lessor’s estimate of what the car will be worth later. An owner pays no such fee, but absorbs the actual depreciation that the lease’s residual merely anticipates. The car lease calculator and the car depreciation calculator model those two sides of the same coin, and they are meant to be read together: the lease article itself points to the depreciation calculator for value loss after purchase.
What each calculator does
The car lease calculator takes MSRP, the negotiated selling price, the lease term, residual value as a percentage of MSRP, the money factor, sales tax rate, fees, down payment and rebates, and trade-in credit. It sets residual value from MSRP, builds net capitalized cost from selling price plus fees minus down payment, rebates, and trade-in credit, then splits the payment into monthly depreciation, monthly finance fee, and monthly tax. The outputs include the estimated monthly payment with tax, the pre-tax payment, residual value, net capitalized cost, the depreciation and finance portions, implied APR, and total lease payments. At the end of the term the car is returned; the lessee has paid for the modeled value loss without owning the asset.
The car depreciation calculator takes an original purchase price, car age in years (decimals allowed), a first-year depreciation rate, and a later annual depreciation rate. It prorates the first-year rate for cars under one year old, and for older cars applies the full first-year rate then compounds the later annual rate. The outputs are the estimated current value, total depreciation, percent of the original price lost, and the estimated value in one more year. The page stresses that this is an economic value-loss estimate with no mileage, condition, or salvage-floor input — actual resale value depends on much more, and business tax depreciation can follow different IRS rules.
Side-by-side
| Car lease calculator | Car depreciation calculator | |
|---|---|---|
| Question | What does this lease cost per month? | How much value does an owned vehicle lose? |
| Inputs | MSRP, selling price, term, residual %, money factor, tax rate, fees, down payment and rebates, trade-in credit | Purchase price, age, first-year and later annual depreciation rates |
| Primary output | Estimated monthly payment with tax | Estimated current value |
| Value assumption | Residual value set up front as a percentage of MSRP | User-chosen first-year and later depreciation rates |
| What you pay | Depreciation fee + finance charge + tax, then return the car | The full purchase price, then absorb actual resale loss |
| Ownership | No — vehicle returned at lease end | Yes — vehicle is yours, and its value keeps changing |
| Other outputs | Pre-tax payment, monthly tax, net capitalized cost, implied APR, total payments | Total depreciation, percent lost, next-year value |
When to use which
Use the lease calculator when you have a specific lease offer to evaluate — the money factor, residual percentage, and capitalized-cost structure appear nowhere else — and when you plan to return the vehicle after a shorter term. It also surfaces the risk of large upfront cash: a down payment lowers the monthly payment, but the page notes that cash may not be recovered the same way if the vehicle is totaled early.
Use the depreciation calculator when ownership is the plan: estimating the value of a car at sale time, comparing buying new versus used, deciding when to sell, or checking whether an expected resale value might fall below a loan balance. Its rate-based model is easy to run as optimistic, base, and conservative cases, which the page recommends.
The two tools answer the ownership question from opposite ends. A lease’s residual is a fixed, upfront prediction of future value, baked into the monthly payment. An owner faces the same value uncertainty but as actual loss at resale — the depreciation article calls value loss often the largest ownership cost for a newer vehicle. To compare the paths, run the lease payment for the term you want, then run the depreciation scenarios for the same period on the owned car and add the financing and other costs, and judge both against the rest of your spending in the budget calculator.
Limits and disclaimer
Both pages are scenario estimates, not quotes or appraisals. The lease calculator assumes net capitalized cost stays above residual value and rejects impossible terms; the depreciation calculator is entirely rate-based and ignores mileage, condition, accident history, and market factors. Neither includes insurance, fuel, maintenance, or repairs, and the depreciation page is explicit that its result is not tax depreciation. Both are educational only and not financial advice; a lease decision belongs with the written contract and a purchase decision with the actual market value of the car.