D. Factors in Computing Depreciation/Depreciation Methods.
1. The computation of depreciation expense is based on three factors:
a. Cost.
activity, or units of output.
c. Salvage value (residual value) is an estimate of the asset’s value at
the end of its useful life.
2. There are three depreciation methods.
a. Under the straight-line method, companies expense the same
amount of depreciation for each year of the asset’s useful life. The
formula for computing annual depreciation expense is depreciable
cost (cost less salvage value) divided by useful life. The straight-
line method is simple to apply, and it matches expenses with
revenues when the use of the asset is reasonably uniform
throughout the service life.
b. Under the units-of-activity method, useful life is expressed in terms
of the total units of production or use expected from the asset. Annual
depreciation expense is computed by multiplying depreciable cost
per unit by the units of activity during the year. This method is not nearly
as popular as the straight-line method because it is often difficult for
companies to reasonably estimate total activity.
c. The declining-balance method produces a decreasing annual
depreciation expense over the asset’s useful life. Companies
compute annual depreciation expense by multiplying the book
value at the beginning of the year by the constant declining-balance
depreciation rate. This method is compatible with the expense
recognition principle in that it matches the higher depreciation
expense in early years with the higher benefits received in these
years.