How much a car depreciates each year depends on the specific make and model and what it cost in the first place, so rather than looking at a specific amount of depreciation, look at its depreciation rate – the speed at which its value drops over time.
A car generally depreciates the most (and has a higher depreciation rate) in its first year, partly because of the initial tax you pay on new cars and partly because it’s now a used car and not a new car. Traditionally, your car could lose anything from 10% to 35% of its value in that first year.
As a car gets older, its depreciation rate generally slows and once it has reached a certain age it usually has little value left to lose in depreciation, as long as it’s roadworthy. After 10 years, for example, a car’s depreciation rate may have slowed to as little as 1% or 2% per year.