Published September 29, 2026
Depreciation flattens — payments disappear
A new car loses value fastest in years one through three. But depreciation is measured in dollars, and there is less value left to lose each year. By year six, the annual drop is a fraction of the early years. Meanwhile the loan is gone: years six through ten have no payment at all. Those two facts together make long ownership dramatically cheaper per year than serial three- or five-year replacement.
This is also why the early years feel expensive and the later years feel cheap. The feeling is accurate. The mistake is trading the car right when it gets cheap.
A worked ten-year example
Buy a $35,000 car: 10% down ($3,500), finance $31,500 for 60 months at 6.5%. The payment is about $616 a month, so purchase plus interest totals roughly $40,460. These are sample assumptions, not forecasts.
- Sell after 5 years for $17,500. Net capital cost: about $22,960, or $4,592 per year before fuel, insurance and maintenance.
- Keep for 10 years and sell for $6,000. Net capital cost: about $34,460, or $3,446 per year — roughly 25% cheaper per year on the car itself.
Now add the honest counterweight: maintenance rises with age. Budget roughly $4,000 for years one through five (tires, brakes, scheduled service) and roughly $8,000–$10,000 for years six through ten (a second set of tires, suspension work, alternator or starter, cooling system). Even after doubling the repair budget, the ten-year path usually wins by thousands — because one purchase is spread over twice as many years.
Insurance can help too: as the car's value falls, many drivers sensibly reduce collision coverage, trimming the premium in the later years.
The repair-vs.-replace rule of thumb
Keep the car while a year's repairs cost comfortably less than a year of new-car payments. Twelve months of $616 payments is $7,392 — a $2,500 repair year is not even close to justifying a trade. Replace when the math flips: chronic breakdowns, a repair bill approaching the car's remaining value, or rust and structural issues that no repair truly fixes.
Reliability is the multiplier. A boring, well-maintained car with a strong parts supply is the ideal ten-year candidate. A car that strands you has a cost no spreadsheet captures.
When keeping it is the wrong call
- Safety you actually need. If your driving changed — a new teen driver in the house, far more highway miles — modern driver-assistance features can be worth paying for.
- The car no longer fits. A two-seater after twins arrive is not a math problem.
- Repairs exceed the car's value. A $5,000 transmission on a $4,000 car is a donation, not maintenance.
- Corrosion. Mechanical parts can be replaced; a rusted structure cannot be trusted.
Use the calculator for the five-year picture, then extend it: divide the net purchase cost over ten years instead of five, add a realistic years-six-through-ten repair allowance, and compare the yearly averages. The payment-free years are where the savings hide.