How car depreciation works and how to lose less of it

Car depreciation is the value a car loses between the day you buy it and the day you sell it. It happens fastest at the start: a typical new car loses something like 15 to 25% in its first year and then around 10 to 18% a year after that, so after five years many cars are worth about half what they cost or less. For most owners it is the single biggest cost of running a car, larger than fuel or insurance, yet it never appears on a bill. The car depreciation calculator makes it visible, and this guide explains the curve behind it.

What depreciation is

Depreciation is simply the difference between what you pay and what the car is worth later. You do not pay it month by month; you pay it all at once when you sell or trade in, which is why it is easy to ignore. Spread over the years you own the car, it is a real running cost. A useful habit is to express it per year and per mile, the same way you think about fuel: How to calculate fuel cost for a trip, per mile, and per year — and what really changes it does that for the fuel side, and the fuel cost calculator adds it up.

The depreciation curve

Car values tend to fall by a percentage each year rather than a fixed amount, so the curve is steep at first and flattens out. The first year is the steepest, because a car stops being new the moment it is registered and the first buyer pays a premium for that. After that the yearly percentage settles, and because it applies to a smaller value, the cash lost each year shrinks too. The calculator models exactly this: one rate for year one and a steady rate for every later year, applied to the remaining value. Its presets range from cars that hold value well (12% then 10%) to fast-depreciating luxury models (25% then 18%), and you can type your own rates.

A worked example

Take a £32,000 new car on the calculator's average profile: 20% in year one and 15% a year after that, kept for five years.

• After year one it is worth £32,000 × 0.80 = £25,600.
• After four more years at 15% it is worth £25,600 × 0.85 × 0.85 × 0.85 × 0.85, about £13,363.
• The total loss is about £18,637, or roughly £3,727 a year.
• At 10,000 miles a year, that is about 37p a mile in depreciation alone.

Now buy the same car at one year old for £25,600 and keep it four years. It ends at the same £13,363, but you lose about £12,237, roughly £3,059 a year. The first owner absorbed the steepest drop. These rates are averages; real values depend on the specific car and market, so check a valuation guide or dealer quotes before relying on a number.

What makes a car hold its value

• Demand for the model. Reliable, popular cars with a strong used market usually depreciate more slowly than niche or luxury models.
• Mileage and condition. Higher-than-average mileage, damage and a patchy service history all cut the price.
• Running costs. Thirsty or expensive-to-insure cars lose value faster when fuel prices rise.
• Technology. Older electric cars have often depreciated quickly as range and charging improved, although this varies by model.
• Colour and specification. Mainstream colours and sensible options are easier to sell.

Ways to lose less

The most effective step is buying nearly new, letting someone else pay for the first year. Keeping a car longer also helps, because the yearly cash loss falls as the car ages, although repairs become more likely. Keep every service record, fix small damage before selling, and avoid paying for options that buyers will not value. If you finance a new car, watch out for owing more on the loan than the car is worth in the early years; the car loan calculator shows the balance, and Lease or buy a car? How to compare the real cost explains how depreciation drives the cost of leasing. If you are weighing an electric car, the EV vs gas calculator compares running costs alongside it.

Depreciation for tax is different

Businesses also talk about depreciation when they spread the cost of a vehicle over several years in their accounts or claim tax relief on it. That is an accounting or tax schedule set by rules, such as capital allowances in the UK or depreciation schedules in the US, and it often bears little relation to what the car would actually sell for. The car depreciation calculator estimates market value, not tax relief. For straight-line or declining-balance schedules of any asset, use the general depreciation calculator, and ask an accountant how the rules apply to your business.