Cars and the five costs that actually matter

Dear Prosperics users,

Walk into any dealership and the conversation steers immediately to one number: the monthly payment. It is also the least informative number in the entire transaction. Two deals with identical monthly payments can differ by thousands of dollars in five-year cost, because the payment hides term length, money factor, residual assumptions, and what you own at the end.

Our Car Calculator compares cash, financing, and leasing on total cost of ownership. Here's the framework it uses, applied to one concrete vehicle.

The five costs that actually matter
Depreciation — the largest cost of ownership for most vehicles, and the one nobody sees on a statement. A typical new vehicle loses roughly half its value in five years; some EVs and luxury sedans lose more, trucks and some hybrids less.
Financing cost — interest on a loan, or the money factor buried inside a lease.
Insurance — often $1,800–$3,200 a year for a new vehicle, and lenders and lessors require full coverage.
Energy — fuel or electricity. At 12,000 miles a year, a 28-mpg gas car at $3.40/gallon runs about $1,460 annually; an EV at 3.3 mi/kWh on $0.16/kWh home charging runs about $580.
Maintenance and repairs — modest in years 1–3, climbing after warranty expiry.
One vehicle, three ways: a $38,000 crossover over five years
Assume a $38,000 purchase price, 12,000 miles per year, and a realistic 45% residual value after five years ($17,100). Numbers are illustrative — the calculator lets you use live rates and your own state's costs.

Option 1: Cash
You part with $38,000 on day one (plus tax and fees). Five-year cost: $20,900 of depreciation, plus insurance, energy, and maintenance. There's also an invisible line item: opportunity cost. If that $38,000 could have earned 4% in a high-yield account, holding the car "costs" roughly $7,600 of forgone interest over five years. Cash is the cheapest option in sticker terms, but only decisively so when savings rates are low.

Option 2: Finance — 60 months at 6.9% with $5,000 down
You borrow $33,000. The payment lands near $652/month, and total interest over the term is about $6,100. Five-year cost is the cash scenario plus that interest, minus the opportunity-cost advantage of keeping $33,000 invested early on. At the end you own a $17,100 asset. Financing loses to cash on total dollars but wins on liquidity — and the gap narrows to almost nothing when loan APR and savings yields are close.

Option 3: Lease — 36 months, then lease again
A lease payment prices the depreciation the lessor expects, plus rent charge. On this vehicle a representative lease runs $470/month with $2,500 due at signing — about $19,400 over 36 months, after which you own nothing and start over. Stretching the comparison to five years (a second lease covering months 37–60) brings the total to roughly $33,000 with no asset at the end, versus about $27,000 net of residual value for the financed purchase. Leasing costs more in almost every honest five-year comparison.

So why does anyone lease?
Because the honest comparison isn't the only one that matters. Leasing genuinely wins when:

You'd replace the car every 3 years anyway. Serial new-car buyers pay peak depreciation repeatedly; a lease just prices it transparently and shifts residual-value risk to the lessor.
EV incentives flow through the lessor. Some EV tax credits apply to leases when they wouldn't apply to your purchase, and lessors often pass them into the payment. In 2026 this remains the single biggest legitimate lease advantage — an EV lease can beat financing the identical car.
Business use makes lease payments cleanly deductible.
Gas vs. EV: run the energy math for your utility, not the national average
The EV energy advantage above ($880/year) assumed home charging at $0.16/kWh. Fast-charging at $0.42/kWh erases most of it. If you can't charge at home or at work, an efficient hybrid frequently beats an EV on five-year cost. The calculator models both energy paths plus the purchase-price and depreciation differences, which is the only way to see the real crossover for your situation.

Three rules that survive every scenario we've run
Never negotiate on monthly payment. Negotiate the out-the-door price, then the financing, separately. Payment-first negotiation is how a 72-month loan at a higher rate gets disguised as a "better deal."
Match the loan term to your ownership horizon. Being upside-down (owing more than the car is worth) in year 4 of a 72-month loan removes every good option if your circumstances change.
Total cost of ownership, always. A $3,000-cheaper car that costs $900 more a year to insure and fuel is not cheaper.
Put your actual numbers — price, rate, mileage, your state's insurance reality — into the Car Calculator and compare all three paths side by side before you set foot in the dealership.

Educational content only — not financial advice. Rates and figures are illustrative; verify current rates before deciding.

Prosperics Editorial Board