Accounting theory and practice, Volume 2 (of 3) : a textbook for colleges and…
1. PROPORTIONAL METHODS
1089 words | Chapter 62
(a) Straight Line Method
The straight line method is, first of all, simple in application
and can easily be adapted to any asset under almost any conditions.
Partly because of the ease of calculation and application, it has been
designated as an official method by many regulatory boards. Its basis
is a time basis and it spreads the charge evenly over the periods of
the service life of the asset. Accordingly, where the time elements of
depreciation, viz., decrepitude, inadequacy, or obsolescence, control
and where the output does not fluctuate much from period to period, the
straight line method should give satisfactory results for its intended
purpose, i.e., for allocating the real depreciation charge.
Its effect, however, must be considered also in conjunction with
the distribution of the other costs connected with the asset. Many
engineers maintain that repairs are light during the early life of an
asset and heavy during the later years. If this is true and these costs
are charged to the period in which they are incurred, the combined
depreciation and up-keep costs place an unjustly heavy burden on the
output of the later years. Almost equally good authority maintains that
the cost of repairs is in no sense uniformly graduated as implied above
but can be counted upon in practice to be extremely irregular. If this
is true and up-keep costs are charged as above, then many periods are
apt to be underburdened and others loaded too heavily.
While, however, these considerations must be given weight when a
single asset is under view, in a large plant after operation has
continued to the point where a normal and fairly regular cost of
up-keep has become established, the inequalities of the individual
up-keep charges may merge into fairly equal charges for the up-keep
of the plant as a whole. This the law of averages accomplishes to a
greater or less degree. But in a small plant with few assets subject
to depreciation, the equality of the whole might not result from the
individual inequalities. After all, this magic rule of averages which
is invoked to cover up many troublesome and embarrassing situations is
obnoxious to scientific accounting; it is a makeshift which carries
with it a shiftless trust in the happy outcome of things—a trust which
has been so often betrayed as to carry little weight.
If depreciation costs can be predetermined with a satisfactory degree
of accuracy—and an estimate of them is all that can ever be made—with
equal accuracy and satisfaction can up-keep costs be predetermined.
The one is no more difficult than the other and equal reason exists
for predetermination in both cases, viz., the securing of an equitable
distribution of costs. With both estimates made at the beginning of the
service life of the asset, all costs in connection with the asset can
thus be prorated over the years of its service life.
If, as stated above, the output is fairly regular as between periods,
fair and equitable results will be obtained. If the output fluctuates
violently, unsatisfactory costs and an inequitable burdening of
product will be the result. The proper treatment of overtime and
“beyond-capacity” work, i.e., abnormal operations, requires care. It
is expected that such work will have a higher unit cost than normal
output, and it is proper that a sliding scale of depreciation be
applied in such a case.
(b) Working Hours Method
Most of the considerations taken into account for the straight line
method are equally applicable to the working hours method. Here,
with the service life expressed in terms of working hours instead
of fiscal periods, a far step has been made towards securing an
equitable distribution of depreciation costs over product. The rate
per working hour can in this way be applied directly to the product.
The machine-hour and sold-hour methods of costing distribute the
depreciation along with all other costs on this basis of “rate per
working hour.”
Where a machine or other asset is limited in its use to a few
operations equally wearing in their effect, this method should give
satisfactory results. Where, however, one asset can be used for
many different processes, involving inequalities in wear and tear,
if the service rendered is the controlling factor, an inequitable
distribution will result. Similarly, beyond-capacity operation, i.e.,
operation beyond the normal speed at which depreciation cost has
been predetermined, will not be taken care of automatically by this
method. Adjustment is necessary and, though arbitrarily made, must be
attempted. Thus, ten articles might be turned out in one working hour,
whereas an estimated output of six formed the basis for determining
the rate of depreciation per working hour. As with the straight line
method, so here equal care must be exercised in securing an equitable
distribution of up-keep costs.
(c) Composite Life Method
This is not a working method for estimating individual depreciation
costs, but rather a method of proof or check, which proves very
valuable in some cases. The method is discussed in detail on page 197
where the uses to which it may be turned are pointed out.
(d) Service Output Method
The service output method bases the depreciation cost not on years of
life nor on life in terms of working hours of service. Here an attempt
is made to predetermine the output of the asset in terms of units of
product, and so burden every unit with its fair share of depreciation.
To secure full equality of charges, up-keep costs must be reckoned on
the same basis, rather than on a time basis of service hours or length
of life. If conditions are uniform and normal, this method, where
applicable, secures perhaps the most satisfactory of all allocations
of depreciation costs. To an individual machine performing several
different processes the method would scarcely be applicable. To a group
or battery of machines, turning out a uniform product in finished form
or in the same degree of partly finished condition, the method could
be well applied. The estimated total output of the group would then be
taken as the basis for calculating the service output of each machine
in the group. When calculating service life in whatever units, that
speed of operation which secures the highest efficiency is taken as the
figure of normal operation.
From the foregoing it follows that the service output method of
calculating the depreciation charge per unit of output is well adapted
to an inherently wasting asset, such as a mine, a quarry, and timber
lands, and is almost invariably applied in such cases.
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