Most cars lose value over time, unless they are - or become - particularly rare.
The table below indicates how much value a car loses over time.
Point in time
up to 10%
up to 90% of original value
65-85% of original value
40-65% of original value
30-40% of original value
20% of original value
As soon as you drive a new car off the showroom forecourt, it could lose as much as 10% in value.
This is partly because the specifications you choose are unlikely to precisely meet the needs of another driver (colour, engine size etc).
It will also simply be less desirable because it isn't, strictly-speaking, brand new.
Mileage is one of the first things people check when buying a used car.
The higher the mileage, the more the depreciation.
The average UK mileage is 10,000-12,000 miles per year.
Driving your car more frequently/for longer distances will accelerate depreciation.
In terms of the amount of value lost over time, a larger, more expensive car will lose more.
In the same period, a smaller car will use less pound-for-pound value, even if the percentage lost is the same for both vehicles.
When a new model is released it may not be clear how reliable it is.
Over time, it may develop a reputation for faults relating to safety - which can dissuade potential buyers.
Some cars get recalled in large numbers due to such problems. If your car is one of them, its value is very likely to fall dramatically.
If a vehicle does not meet the latest emissions standards due to its age, it will cost a new owner more as regards things like emissions charges and VED, impacting its value.
If your car's warranty is out of date, its value will be affected.
Equally, when a car is sold before warranty expiry it may keep more of its value.
The good news is more new cars than ever have longer warranties - sometimes up to seven years.
A detailed service history will help your vehicle maintain more of its value. A poorly recorded service history will of course do the opposite.
Some cars are simply better made or more desirable than others.
If your vehicle has a reputation for being reliable, it may keep its value better. Conversely, a model that develops a reputation for regular faults will be much less valuable over time.
Smaller, more fuel efficient cars will be more attractive to a greater group of potential buyers, and therefore may keep their value better. Meanwhile, a "gas guzzling" 30 mpg vehicle may be far less desirable after the same period.
A year after buying a new car, the technologies inside will likely have been superseded. This makes it less desirable, and therefore worth less.
Even if the same model is available with the same tech a year later, there will be competitor models that do offer newer, better technologies.
A car buyer may also want their new smartphone to sync up with a prospective vehicle. The older a vehicle gets, the less likely it is to be compatible with new smartphones.
As a car ages, components wear out and problems start to brew. This means anyone buying an older car will need to factor in future repair costs - reducing the perceived value of the vehicle.
In addition, while repairs may have been undertaken to keep the car in good working order, the quality of these repairs (and replacement parts used) may be difficult to ascertain. Some garages use cheaper, lower quality parts.
If you’re looking to maximise the value of a used car, the sweet spot is around five years old (as a guide).
This minimises depreciation and maximises reliability for the sum paid.
Credit: VanderWolf Images - stock.adobe.com
According to AutoExpress, the Mercedes S Class (pictured above) is the fastest-depreciating car in the UK, losing £93,385 on its purchase price of £141,818 (65.8%). This is followed by the Audi A8 and the Subaru Impreza.