How This Calculation Works
This calculator models vehicle depreciation as a declining percentage each year, applied to the previous year's value rather than the original price — this is called "declining balance" depreciation, and it matches how vehicles actually lose value in the real world (a bigger dollar amount early on, tapering off over time).
New vehicles typically lose the most value in their first year — often cited around 20% — due to the immediate transition from "new" to "used" status the moment you drive off the lot, plus the loss of new-car warranty freshness. After the first year, annual depreciation typically slows to somewhere in the 10-15% range, which is why this calculator lets you set a separate rate for year one versus subsequent years.
The year-by-year table shows the compounding effect: each year's depreciation is calculated on the already-reduced value from the prior year, not the original purchase price, which is why the dollar amount lost tends to shrink even as the percentage rate stays roughly constant.
Common Mistakes to Avoid
- Using the same depreciation rate for every vehicle. Depreciation rates vary significantly by brand, model, and even color or trim level. Luxury vehicles and cars with rapidly changing model generations tend to depreciate faster than reliable, popular models with strong resale reputations.
- Ignoring mileage's effect on depreciation. High-mileage vehicles depreciate faster than the rates in this simplified model suggest — mileage is one of the strongest individual predictors of resale value, independent of age alone.
- Forgetting condition and market factors. Accident history, maintenance records, and broader market conditions (like fuel prices affecting SUV/truck demand) can shift actual resale value meaningfully away from a simple percentage-based projection.
- Assuming depreciation is purely linear. Real depreciation is front-loaded — the biggest hit typically comes in year one, with the rate generally slowing over time, which is why this calculator separates the first year from subsequent years.
Worked Example
Scenario: A $35,000 new car, with 20% depreciation in year 1 and 12% in each following year, over 5 years.
Year 1: $35,000 × (1 − 0.20) = $28,000.
Year 2: $28,000 × (1 − 0.12) = $24,640.
Year 3: $24,640 × (1 − 0.12) ≈ $21,683.
Years 4–5: Continuing the pattern, the value drops to roughly $16,800 by year 5 — a total loss of about $18,200, or 52% of the original price.