Truck Depreciation Calculator

Under the Straight Line and Per Mile methods, total depreciation is capped at the depreciable amount (Purchase Price minus Residual Value), so once Current Age reaches Expected Useful Life the truck has been fully depreciated down to Residual Value. Aging the truck further in the calculator does not push Current Book Value below that floor, matching standard depreciation accounting.

It affects a different set of numbers depending on the method. Under Per Mile, Annual Miles drives Current Book Value and Annual Depreciation directly, because depreciation is charged per mile run against the Expected Lifetime Miles basis. Under Straight Line and Double Declining it does not touch Current Book Value or Annual Depreciation at all — but it still divides into the Depreciation per Mile output, so changing it moves that one figure under every method.

Double Declining applies a constant percentage rate to the current, already-reduced book value each year rather than a flat dollar amount, which concentrates more depreciation into the truck's early years and less into later years compared to Straight Line. Both methods still stop reducing book value once it reaches Residual Value. The final year's charge is trimmed so it never takes book value below Residual Value, which is why Annual Depreciation shrinks sharply in the last year or two rather than stopping abruptly.

Not necessarily — this is accounting book value based on the depreciation method and assumptions you selected, not an appraisal of actual resale or trade-in market value, which depends on condition, mileage relative to the industry norm, demand, and market conditions this calculator does not model.