New vs Used Car: Which Actually Costs Less?
Almost every new-versus-used argument gets framed around payments and reliability. The number that actually decides it is depreciation — and it is the one buyers think about least.
Depreciation is the real price of a new car
Run any new car through the True Cost to Own Calculator and the same thing happens: depreciation comes out as the single largest line, usually 35–45% of everything the car costs you. It beats fuel. It beats insurance. On most cars it beats maintenance and interest combined.
It also behaves differently from every other cost. Fuel and insurance are paid in small, visible amounts you feel each month. Depreciation is invisible until the day you sell, at which point it arrives as one large number you have no ability to negotiate.
The shape of the curve is what matters. A new car typically loses about 20% in year one and roughly 40% by the end of year three. From there the annual loss flattens considerably. Buying new means volunteering for the cliff; buying used means starting on the slope.
A concrete comparison
Take a $35,000 new car against the same model three years old at roughly $21,000. Hold everything else equal and keep each for five years:
| New at $35,000 | 3-year-old at $21,000 | |
|---|---|---|
| Value after 5 years | ~$15,500 | ~$9,300 |
| Depreciation absorbed | ~$19,500 | ~$11,700 |
| Sales tax (6%) | $2,100 | $1,260 |
| Interest (7%, 60 mo) | ~$5,600 | ~$3,400 |
| Difference before upkeep | The used car is roughly $10,800 cheaper | |
For the used car to lose that comparison, it would need to consume more than $2,000 a year in extra repairs. That happens — but it is the exception, not the expectation, on a well-chosen three-year-old vehicle with service history.
Illustrative figures at 15% annual depreciation. Real depreciation varies enormously by make and model — trucks and some hybrids hold value far better than luxury sedans and EVs.
Where the used-car case gets weaker
- A thin price gap. When used prices run hot, a three-year-old car can cost 80% of new. At that point you are paying nearly new-car money to inherit someone else's wear.
- Subsidized manufacturer financing. A genuine 1.9% promotional rate against 8% on a used loan is worth thousands and can close much of the gap. Check whether it is real — see cash vs financing.
- Long ownership. If you keep cars twelve years, the first-year cliff is spread thin enough that it matters much less.
- Unknown history. Depreciation savings evaporate fast if you buy a neglected car. Pay for the pre-purchase inspection.
How to actually decide
- Price the specific new car and the specific used car you would really buy — not category averages.
- Run both through the True Cost to Own Calculator with the same years of ownership and mileage.
- Add a realistic repair budget to the used car. If it still wins by thousands, the extra maintenance risk is priced in.
- Check the result against what you can actually support with the Car Affordability Calculator.
The answer is not universal. But it is calculable, and the calculation is usually decided by one number most buyers never look at.
General information, not financial advice. Depreciation rates, tax, and financing terms vary — verify with real quotes.
Frequently asked questions
How much does a new car depreciate in the first year?
Commonly around 20% — and a meaningful chunk of that happens the moment the car is titled to you. By the end of year three a typical new car has lost roughly 40% of its value. That loss is real money you paid, you just never write a check for it; it shows up when you sell.
Is buying a 3 year old car the sweet spot?
For pure cost efficiency, usually yes. The car has absorbed the steepest depreciation but typically has plenty of service life left, and on many models it is still inside the powertrain warranty. You are buying the flat part of the curve instead of the cliff.
When does buying new actually make sense?
When the price gap to a comparable used car is small (which happens in tight used markets), when manufacturer financing is genuinely subsidized well below market rates, when you plan to keep the car ten-plus years so the depreciation is spread thin, or when you need a specific configuration that is hard to find used.
Do used cars cost more to maintain?
Generally yes, and you should budget for it. But the gap is usually far smaller than the depreciation difference. A few hundred dollars a year of extra maintenance rarely offsets thousands a year of avoided depreciation — run both through the True Cost to Own Calculator rather than guessing.