How it works
If a business buys a long-lived
asset, such as a building, factory
equipment, or computer, to help it
earn income, this expenditure can
be offset as a cost against income
earned. However, not all this
income will be generated in the
year of purchase and, over time,
the asset will age and become less
beneficial to the business, until
it becomes outdated or unusable.
Accountants do two things to
turn the declining value into a
tax advantage. Firstly, they work
out how much the asset’s value
decreases over a period of time—
typically a year. Secondly, they
match that loss in value to the
amount of income earned in that
period, so depreciation becomes
a deduction from taxable income.
There are several different
ways to calculate depreciation.
The method a company uses may
depend on the kind of business, the
type of asset, tax rules, or personal
preference. In the United States,
per IRS guidelines, companies
must use MACRS (Modified
Accelerated Cost Recovery System),
a combination of straight-line and
double declining balance methods
(see below and p.126).
Depreciation
When a company buys an asset, its cost can be deducted from income
for accounting and tax purposes. Depreciation allows the company to
spread the cost, by calculating the asset’s decline in value over time.
USEFUL ECONOMIC
LIFE (YEARS)
ANNUAL
DEPRECIATION ($)
=
Example
A landscaping business buys a
new van for $25,000. The IRS
sets its scrap value at $5,000
after five years of use.
Year 1 After a year, the van’s
value has depreciated by $4,000
(its purchase value minus its scrap
value, divided by its useful economic
life). Its value is now $21,000.
$25,000 – $5,000
5
$4,000
=
Fixed/tangible assets Items that
enable a business to operate but are
not a part of trade; assets lasting a
year or more qualify for depreciation
Useful/economic life Length of
time an asset is fit for its purpose
and has monetary value
Salvage/scrap/residual value
Worth of an asset once it has
outlived its useful life—often set
by the tax authority
Book value An asset’s worth on
paper at any point between its
initial purchase and salvage
NEED TO KNOW
The straight-line method is the simplest way of working out
depreciation and can be applied to most assets. Depreciation is
calculated along a timeline, with value loss spread evenly over
the asset’s economic life. Scrap value is deducted from purchase
value and the remainder is split into equal portions over time.
Calculating depreciation
$21,000
VALUE ($)
$25,000
$20,000
$15,000
$10,000
$5,000
1
0
PURCHASE
VALUE
SCRAP
VALUE
–
$
$
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124 125
how finance works
Financial accounting
Year 2 After the second year, the
value has depreciated by another
$4,000. The van will lose an equal
amount of value each year for the next
three years of its useful economic life.
Year 3 At the end of the third
year, the van has depreciated
by another $4,000, and its book
value is $13,000, although its
actual value may be more or less.
Year 4 The van
has depreciated by
$4,000, to $9,000,
at the end of four
years of life.
Year 5 By the
end of year five,
the van is valued
at only $5,000—
its scrap value.
RACEHORSES
2 years
COMPUTERS
3 years
OFFICE
FURNITURE
6 years
ROADS
15 years
BOATS
20 years
FRUIT-
BEARING TREES
10 years
Time
(years)
5 15
10 20
$17,000
$13,000
$9,000
$5,000
TIME (YEARS)
2 3 4
5
Typical life of fixed asseTs
Tax authorities often specify the typical useful (economic) life of a particular asset.
This helps to standardize depreciation, and to eliminate uncertainty about value
and the number of years over which an asset can be depreciated.
60%
the value the
average car
loses after
three years
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