The number on the windscreen is not the cost
Two cars sit side by side with the same price. One of them will cost you a third more over five years. Nothing about the sticker tells you which. The price is a single payment at a single moment, while owning a car is a stream of payments spread across sixty months, and the largest of those payments is one you never write a cheque for at all.
Total cost of ownership, usually shortened to TCO, is the discipline of adding that stream up. It is not a clever technique. It is bookkeeping applied before the purchase rather than after it. The reason it changes decisions is that the ranking of cars by five year cost frequently differs from the ranking by price.
The framework: seven lines and one formula
Every recurring motoring cost fits into one of seven lines. The names differ between countries but the categories are stable.
- Depreciation. The purchase price minus what the car is worth when you sell it. This is a real cost even though it is invisible month to month.
- Fuel or electricity. Distance driven, multiplied by consumption, multiplied by unit price.
- Insurance. The annual premium plus any insurance premium tax.
- Scheduled maintenance. Servicing at the intervals the manufacturer specifies, including fluids and filters.
- Wear items. Tyres, brake pads and discs, wiper blades, the battery. Predictable but lumpy.
- Taxes and compulsory charges. Annual road tax or circulation tax, periodic technical inspection, road tolls or vignettes, low emission zone permits.
- Unscheduled repairs. Everything that breaks. Small while a warranty runs, then rising.
Finance is the eighth line if you borrow. Interest paid is a genuine cost of ownership and belongs in the total. If you pay cash, the honest equivalent is the return you gave up on that cash, though many people leave it out for simplicity.
The formula is simply:
Five year TCO = (Purchase price + acquisition costs) minus (Resale value after five years) plus the sum of five years of running costs plus finance costs.
Two derived figures make comparison easy. Cost per year is TCO divided by five. Cost per kilometre is TCO divided by total distance driven. The second is the fairer one when comparing across people who drive very different amounts.
A worked example, entirely hypothetical
The figures below are invented for illustration only. They are not prices in any country and should not be used as estimates. Substitute your own.
Suppose the car costs 30,000 all taxes included, and suppose you expect it to be worth 13,500 after five years, that is 45 percent of what you paid. Depreciation is therefore 30,000 minus 13,500, which is 16,500.
Suppose you drive 15,000 kilometres a year, so 75,000 over five years. Suppose the car uses 7 litres per 100 kilometres and fuel costs 1.60 per litre. That is 1,050 litres a year, at 1.60 a litre, so 1,680 a year and 8,400 across five years.
Suppose insurance is 900 a year, so 4,500. Suppose servicing averages 500 a year, so 2,500. Suppose you buy two sets of tyres at 600 each, so 1,200. Suppose annual road tax and inspection come to 200 a year, so 1,000. Suppose you set aside 1,500 in total for repairs outside warranty. Assume you paid cash, so no interest.
| Cost line | Behaves like | Five year total (illustrative) | Share of TCO |
|---|---|---|---|
| Depreciation | Driven by price and residual value, not by use | 16,500 | 46 percent |
| Fuel | Proportional to distance | 8,400 | 24 percent |
| Insurance | Mostly fixed per year | 4,500 | 13 percent |
| Scheduled maintenance | Time and distance based | 2,500 | 7 percent |
| Unscheduled repairs | Rises with age | 1,500 | 4 percent |
| Tyres and wear items | Lumpy, distance based | 1,200 | 3 percent |
| Taxes and inspection | Fixed per year | 1,000 | 3 percent |
| Total | 35,600 | 100 percent |
The total is 35,600, which is 7,120 a year, or 35,600 divided by 75,000 kilometres, about 0.47 per kilometre. Three observations follow from those invented numbers, and they tend to hold in real cases too.
First, the five year cost is larger than the purchase price, here by nearly 19 percent. Second, depreciation alone is close to half the total, which means resale value deserves more research attention than fuel economy. Third, the two lines people negotiate hardest over, servicing and tyres, are together only a tenth of the bill.
Sensitivity is where the value is
A single TCO number is less useful than knowing which input moves it. Recalculate with one change at a time. If the residual value is 40 percent instead of 45 percent, the car is worth 12,000 rather than 13,500, depreciation rises by 1,500 and the total goes to 37,100. If fuel rises to 2.00 per litre, the fuel line becomes 2,100 a year and 10,500 over five, adding 2,100. If you drive 25,000 kilometres a year rather than 15,000, fuel scales to 14,000, tyres and servicing rise, and the residual value falls because higher mileage cars sell for less. High mileage drivers should notice that distance hits three lines at once.
Building your own version honestly
- Get the resale estimate from listings, not from hope. Search the same model at five years old with plausible mileage in the market where you will sell it.
- Get insurance from a real quote, for your address, your licence history and your intended use, before you buy.
- Get the service schedule from the manufacturer and price the listed items at a local workshop.
- Get tax and inspection figures from the vehicle registration authority for the exact variant, since bands can change with engine, weight or emissions.
- Keep the comparison like for like. Same holding period, same annual distance, same currency, same treatment of finance.
One caution about horizons. Five years is a convention, not a law. If you habitually change cars after three years, run the model over three, because the depreciation curve is steepest early and a three year total will look very different in proportion.
Rules, tax bases, insurance markets and resale patterns vary considerably from one country to another, so confirm every input with the relevant local authority, an insurer, a workshop or a qualified professional before relying on it. This article explains a method of calculation and is general information, not personalised financial or tax advice, and we are not suggesting that any particular vehicle is a sensible purchase for you. We would treat the model as a way to ask better questions rather than as a verdict.
How to Use This Guide
Every worked example on this page is illustrative. The figures are chosen to show how the calculation behaves, not to report current market rates. Costs, tax rules and eligibility criteria differ by country and change over time, so take the method from this page and put your own current figures into it. Browse the rest of our guides, or see how we source and check our comparison figures on the about page.
Information only. This article explains how costs and rules are structured. It is not financial, tax, legal or immigration advice, and it is not a recommendation to buy any property, vehicle or investment. Confirm anything that affects a decision with the relevant local authority or a qualified professional before you act on it.
Last updated: August 14, 2026