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True cost: new vs used
Your prices, loan, and plans — the calculator prices the cliff on both sides.
X VS Y COMPARISON · MONEY · CARS
Buy New vs Buy Used Car
A $45,000 new car versus the same car at 3 years old for $27,000. The sticker gap is $18,000 — but the honest comparison includes the loan interest, the extra insurance on the new car, the extra repairs on the used one, and what each car is worth when you sell it. Enter your numbers and this calculator prices the depreciation cliff both sides really face.
What the comparison shows
A $45,000 new car against a 3-year-old at $27,000 (40% off sticker), $5,000 down, 6.5% for 60 months, kept 8 years, with $1,200/yr extra used-car repairs and $600/yr extra new-car insurance. The new car’s payment is $782.65/mo; the used car’s is $430.46/mo.
| Output | Formula | Meaning |
|---|---|---|
| True cost to own (each) | down + all payments + insurance + repairs − resale | What the years actually cost you, net of what you sell it for — the only number both cars can be fairly compared on. |
| Depreciation gap | new-car value lost − used-car value lost | The head start you buy by letting the first owner eat the cliff: $13,500 in this example. |
| The verdict | lower net cost wins | Buy used — saves $11,831 ($33,727 vs $45,559 net), or about $123.24/month of ownership cost avoided. |
Side by side over 8 years: the new car costs $59,959 all-in and sells for $14,400 (net $45,559); the used car costs $43,627 all-in and sells for $9,900 (net $33,727). The depreciation gap ($13,500) is bigger than the entire used car’s extra repair bill over the same period ($9,600).
The depreciation cliff, on one $45,000 car
Blended industry-average curve (26-model average from carvalue.ink, checked against Kelley Blue Book/iSeeCars and financewonk benchmarks): about 20%% of value is gone in year one, roughly 40%% by year three. Buying at year three skips the steepest part:
| Car age | Value retained | The $45,000 car is worth |
|---|---|---|
| New (age 0) | 100% | $45,000 |
| 1 year | 80% | $36,000 |
| 2 years | 69% | $31,050 |
| 3 years | 60% | $27,000 |
| 4 years | 53% | $23,850 |
| 5 years | 47% | $21,150 |
| 8 years | 32% | $14,400 |
| 10 years | 25% | $11,250 |
| 15 years | 13% | $5,850 |
Notice the shape: years 1–3 destroy $18,000 of value; years 8–15 destroy only $8,550. That asymmetry is the entire financial case for buying used — and why holding whatever you buy for a long time is the cheapest move of all.
Who uses this
- The first-time buyer deciding whether the warranty and zero-history of a new car justify a $18,000 sticker premium.
- The family upgrader weighing a new 3-row SUV against a 3-year-old off-lease twin — the sweet spot where modern safety tech meets post-cliff pricing.
- The high-mileage commuter who will put 20,000 miles a year on the car: depreciation is mileage-driven too, so the cliff matters less per mile.
- The long-haul keeper planning 10–12 years: the new car’s cliff flattens out over a long hold, but the used car still starts $18,000 ahead.
Accuracy & limitations
The depreciation curve is a blended industry average, not your car: trucks and hybrids hold value far better (about 40% lost over 5 years) while luxury cars and EVs can lose 55–70% in the same window (carvalue.ink, financewonk). Your exact make, mileage, and condition move the resale numbers materially. The calculator assumes the same loan rate and term on both cars (manufacturers sometimes subsidize new-car rates, which narrows the gap), constant insurance and repair rates, and ignores sales tax and fees (they apply to both, slightly worse for the pricier car). Treat the verdict as the shape of the answer, then sanity-check the resale against KBB or Edmunds for your exact model.
Cite this calculatorBright Side Kit. “New vs Used Car True Cost Calculator.” brightoolbox.com, 2026.
Bright Side Kit. "New vs Used Car True Cost Calculator." https://brightoolbox.com/buy-new-vs-used-car/ Accessed October 22, 2026.Frequently asked questions
Is it always cheaper to buy used?
No — usually, but not always. The used car wins when the sticker gap is big, the used car is reliable, and loan rates are similar. The new car can win when manufacturers subsidize the rate (0–2%% new-car APR vs 6%%+ used), when the used market is overheated (post-2021, 1–2-year-old cars sometimes cost more than new), or when you keep the car 12+ years and the depreciation curve flattens for both. The calculator prices your exact scenario.
What is the best age to buy a used car?
The 3-to-5-year window is the consensus sweet spot (carsurfer): the car has cleared the steepest depreciation (about 40%% off sticker by year three) but still carries modern safety tech, and often part of the factory warranty. Younger than 3, the savings shrink; older than 5 without a careful inspection, repair risk starts eating the savings.
Why does the new car lose so much value in year one?
Two things: the drive-off-the-lot discount (a new car instantly becomes “used,” losing the new-car premium of roughly 10%%) and the market’s knowledge that year one brings the warranty claims. Averaged across 26 models, about 13.4%% of value vanishes in year one (carvalue.ink) — roughly $6,000 on our $45,000 example.
How do insurance costs factor into new vs used?
New cars cost more to insure — typically $400–800 a year more for identical coverage, because the insurer prices the replacement value. Used-car buyers can also drop collision/comprehensive once the car’s value falls below ~$4,000, which the calculator models as a smaller gap; keep both covered while the loan is active (lenders require it).
Does the math change if I pay cash?
The verdict usually gets stronger for used, because cash removes the one lever that favors new cars: subsidized manufacturer financing. Set APR to 0%% in the calculator to see the cash-buyer version — depreciation becomes nearly the whole story.
What if I keep the car for 12+ years?
The gap narrows but the used car still wins in the typical case: over 12 years our example’s gap shrinks from $11,831 to about $11,200, because both cars approach the depreciation floor while the used car keeps paying its repair premium. The lesson holds: buy used, then hold it long is the cheapest combination.