Depreciation, the bill that never arrives
It has no due date and no statement, and it is often the largest thing a car costs. Follow one curve and three points on it.
Nobody has ever opened an envelope from depreciation. It sends no statement, sets no due date, never calls. Fuel announces itself at the pump every week, insurance arrives on schedule, the loan payment leaves on the same day each month. Depreciation simply accrues, silently, from the moment the car becomes yours — and on many cars, especially in the early years, it outweighs every other cost of ownership. Because it never bills, it is the one cost almost nobody budgets.
The reason it goes unnoticed is that you pay it all at once, at the end. The money leaves when you sell or trade the car for less than you paid, or when an insurer settles a total loss at market value, or when a lease ends and the residual has been priced into every payment. Until that moment, the loss is only a number on a valuation guide, and it's easy not to look.
It helps to see its shape. The curve below follows one illustrative car bought for $30,000 and losing 15% of its remaining value each year. That rate is an assumption chosen to draw a typical-looking curve — not a forecast, and not a measured figure for any make or model. Real cars depreciate at very different speeds depending on the model, its reputation, the miles, the condition and the market. But the shape — steep at first, flattening later — is the pattern used-car price guides generally show, and the shape is the point.
Start at A. In the first year this car loses $4,500 — $375 for every month of ownership. Nothing about the car has changed much. It has a year of miles and a year of age, and it's no longer the newest version on the lot. Yet the owner has spent, in value, the equivalent of a substantial monthly payment on top of whatever they actually paid the lender. If the car was bought with a small down payment and a long loan, this is also the stretch in which the loan balance can sit above the car's value, which is the whole reason gap coverage exists.
The steepness at A is not a flaw in the market. Someone always pays for newness, and it is the first owner. The price of being first includes the warranty's full length, the choice of color and options, the absence of any unknown history — and a large, invisible bill for all of it. That can be a perfectly reasonable purchase. It is just rarely described as one.
By B, three years in, the car has fallen to $18,424. That is $11,576 gone, more than a third of the purchase price, at an average of about $322 a month across the three years. But look at what the curve is doing at B: it has already begun to flatten. Year three's loss was $3,251, down from $4,500 in year one. Each year from here takes a smaller bite in dollars, because the same percentage applies to a smaller number. A buyer who steps in at B inherits a car whose steepest decline has been paid for by someone else — which is the core of the argument laid out in new or three years old: the money, though the trade-offs run the other way on warranty, financing and the unknowns of a used car.
At C, year eight, the car loses $1,442 in the year, or about $120 a month. In value terms the car has become cheap to hold. This is the quiet reward of keeping a car a long time: the silent bill shrinks year after year, even as the repair bills, which do arrive in envelopes, begin to grow. Somewhere along the flat part of the curve those two lines — falling depreciation, rising repairs — cross, and where they cross for your car is one of the more useful things to know when deciding when to trade in.
The curve suggests a few habits. The first is simply to put a number on it. Look up your car's current value in a used-car price guide, compare it with a year ago, and divide by twelve; that monthly figure belongs next to fuel and insurance in any honest reckoning of what the car costs. You won't pay it this month, but you are incurring it this month, and you will pay it eventually.
The second is to notice how the curve interacts with how long you keep things. An owner who replaces a car every three years lives permanently on the steep section between A and B, paying the biggest bites over and over. An owner who buys at B and holds to C spends most of their ownership on the gentle slope. Neither is wrong, but they are very different budgets, and the difference never shows up on any single statement.
The third is to recognize that mileage and condition move the curve. The illustrative line assumes an ordinary life. A car driven hard, driven far, or neglected will usually sit below it; one kept carefully, with records, will usually sit above. Some of depreciation is fixed by the calendar and the market, and some of it is in your hands.
And the last is humility about the exact numbers. Used-car prices move with supply, demand, interest rates and fashion, and a curve drawn at 15% a year is a teaching device, not a promise. What holds up across almost every car is the silhouette: a cliff, then a slope, then a long plain.
Picture that shape next time you see a car's price. The number on the windshield is the start of a line, and the line only goes one way.
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Further reading
- Depreciation Investopedia
- True cost to own Edmunds
- Keeping your car in shape FuelEconomy.gov