Car Depreciation: the Bill That Never Arrives

By Alamzeb Khan · Updated August 2026 · 6 min read · Car Depreciation Calculator →

The cost with no receipt

Fuel has a receipt. Insurance has a renewal notice. Servicing has an invoice.

Depreciation has nothing. It is the largest cost of owning most cars and the only one that never sends you anything. You meet it once, on the day you sell, and by then it has already happened.

What it actually looks like

A $30,000 car losing 20% of its remaining value each year, from the car depreciation calculator:

Look at the middle column rather than the total. Year one costs $6,000. Year eight costs $1,258.

Same percentage. Wildly different amounts, because 20% of $30,000 and 20% of $6,291 are not remotely the same thing.

That single fact drives almost every sensible decision about buying cars.

What it means in practice

Buying used works because someone else took the steep part. A three-year-old version of this car costs $15,360 instead of $30,000 - because the first owner absorbed $14,640. You get the same car on the flat part of the curve, where losses are measured in low thousands rather than high ones.

Keeping a car longer gets cheaper every year. The eighth year of ownership costs $1,258 in lost value. If the car is reliable, those late years are the cheapest motoring you will ever do. The instinct to change cars “before it starts costing money” often has it backwards - the expensive years were at the start.

Short ownership is the expensive pattern. Buying new and selling after three years means paying $14,640 in lost value plus the costs of buying and selling, then doing it again. Repeat that through a lifetime and it is one of the larger financial decisions most people never examine.

Why this site will not quote you an average

Every other depreciation calculator hands you a percentage - 20% the first year, 15% after, or similar.

Those numbers come from industry data nobody publishes openly, they vary enormously between models, and quoting one as fact would be inventing a figure.

So this one does something better: it measures the real rate from numbers you already have. Tell it what you paid, what the car is worth now, and how long you have had it, and it works out your actual rate.

Paid $30,000, worth $15,360 after three years? That is exactly 20% a year - measured from your car, not averaged across cars you do not own.

If you have no second figure yet, the tool uses your estimate and says plainly that it is an estimate rather than dressing it up as data.

The connection to being upside down

Depreciation is also what causes negative equity - owing more than the car is worth.

A car loses value fastest in the first two or three years. A long loan pays down very little in that same period. If the value falls faster than the balance, you are underwater, and you stay there until they cross.

That is why small deposit plus long loan is the standard recipe for trouble, and why it matters. The negative equity calculator shows the gap and when it closes.

Four things worth doing

1. Find out what your car is actually worth today. One number turns depreciation from a vague worry into a measurement.
2. If you are buying, look at cars two to four years old. The steepest loss has already been taken by someone else.
3. If your car is reliable, keep it. Late years are genuinely cheap.
4. Check how well the model holds value before you buy, not after. It is one of the few things you can influence, and only at the point of purchase.

Work out your own rate in the car depreciation calculator - it measures from your real figures and shows what the car will be worth when you plan to sell.

Common questions about car depreciation