Find straight-line depreciation — the annual expense and the book value of an asset after any number of years.
Straight-line spreads cost evenly over the asset's life. Tax depreciation (MACRS, Section 179, bonus) works differently — check current IRS rules. General information, not tax advice.
The simplest method: spread an asset's cost, minus its salvage value, evenly across its useful life. Each year's expense is the same, and book value drops in a straight line to the salvage value.
Annual depreciation = (cost − salvage) ÷ useful life
Not necessarily. Books often use straight-line, but US tax uses MACRS schedules (plus Section 179 and bonus depreciation). Confirm the method for your purpose.
The estimated worth of the asset at the end of its useful life — what you could sell it for. It's the floor book value never drops below.
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