The terms that come up around what your car is actually worth — while you own it, if it's damaged, and when you're ready to sell it.
The decline in a car's value over time. New cars typically lose 20-25% of their value in the first year alone, and roughly half their value by year five. Depreciation is the single largest cost of car ownership for most buyers, larger than fuel, maintenance, or insurance combined over a typical ownership period. Some models and brands hold value dramatically better than others — checking a specific model's depreciation curve before buying can matter more to your total cost than the sticker price.
What your car was worth immediately before damage or loss occurred — the figure an insurer uses to calculate a total-loss payout. ACV reflects age, mileage, condition, and market demand; it is not the same as what you paid for the car or what it would cost to replace it new. If you owe more on your loan than the ACV payout, GAP insurance (if you have it) covers the shortfall — otherwise you're responsible for the difference.
When an insurer determines that repairing a damaged vehicle would cost more than (or close to) its actual cash value, they declare it a total loss and pay out the ACV rather than covering repairs. Thresholds vary by state, typically 70-100% of ACV depending on local law — meaning the same damage could be a total loss in one state and a covered repair in another.
The predicted value of a vehicle at a future point in time, most commonly used in leasing — a lease's monthly payment is based largely on the gap between the car's price and its predicted residual value at lease end. Higher predicted residuals mean lower lease payments, since you're financing less of the car's value. Vehicles with strong resale reputations (often certain Japanese and luxury brands) tend to have higher residuals and therefore cheaper lease payments than their sticker price alone would suggest.
See what your car will likely be worth at any point down the road.
Car Depreciation Calculator →The full cost of owning a car over a set period — purchase price and loan interest, insurance, fuel, maintenance, and depreciation combined — rather than just the sticker price or monthly payment. TCO is the number that actually determines whether a car is affordable, since a cheaper car with poor fuel economy or high insurance costs can end up costing more overall than a pricier, more efficient one over a 5-year ownership window.
Fair market value is roughly what a willing private buyer would pay a willing private seller — typically what you'd get in a private sale. Retail value is closer to what a dealer would charge, factoring in their overhead and profit margin, and is generally higher than fair market value for the same car. The gap between the two is essentially the value of the convenience and (often) warranty a dealer provides.
A published reference value from a pricing guide like Kelley Blue Book or NADA/J.D. Power, based on year, make, model, mileage, and condition. Book value is a useful starting benchmark, but real transaction prices can vary from it based on local supply and demand, so it shouldn't be treated as a guaranteed selling or buying price. Different guides can also show noticeably different numbers for the same car, since each uses its own data sources and methodology.
The loss in resale value a vehicle suffers after being in an accident and repaired, even when the repair is done correctly — because a documented accident history reduces what buyers are willing to pay compared to an identical car with a clean history. Some states allow claims against an at-fault driver's insurer for diminished value on top of repair costs, though the process and eligibility rules vary significantly by state, and not every state recognizes this type of claim at all.
An upward or downward correction to a car's book value based on how its mileage compares to the average for its age. A car with well below-average mileage for its age typically adds value; well above-average mileage subtracts from it. Pricing guides publish average annual mileage benchmarks (commonly cited around 12,000-15,000 miles per year) used to calculate this adjustment — a 5-year-old car with 40,000 miles is well below that benchmark and should price higher than an otherwise identical car with 90,000 miles.