Accounting theory and practice, Volume 2 (of 3) : a textbook for colleges and…
2. VARIABLE PERCENTAGE METHODS
1050 words | Chapter 56
The second main classification of methods, called for want of a better
title, “Variable Percentage” methods, differs from the proportional
methods in that either the base or the percentage rate varies for each
estimate of depreciation. The various proportional methods can all be
expressed as percentages but their base remains fixed and is always
the total amount of depreciation to be charged off. Under the variable
percentage methods, if the percentage is fixed, the base varies; and if
the base is fixed, the percentage varies. The subclasses here are:
(a) Fixed Percentage of Diminishing Value Method
(b) “Changing Percentage of Cost Less Scrap” Method
(sometimes known as the “Sum of Expected
Life-Periods” Method)
(c) Arbitrary with Increasing Amounts
(d) Arbitrary with Decreasing Amounts
(a) Fixed Percentage of Diminishing Value Method
The “Fixed Percentage of Diminishing Value” method estimates the
periodic depreciation as a fixed percentage of the appraised or book
value of the asset as at the time of the last appraisal. Thus, if the
asset cost $1,000 and the fixed rate is 10%, the first depreciation
estimate is $100 (10% of $1,000) giving an appraised value of $900; the
second depreciation estimate is $90 (10% of $900), with a new appraised
value of $810; the third estimate is $81 (10% of $810), with an
appraisal of $729 for the asset; and so on. It is evident that a final
zero valuation can never be reached (although it may be approximated)
as the series becomes an indefinite or indeterminate series. If
there is any scrap value, and there usually is, the series becomes
determinate. From the standpoint of calculation the problem here is the
determination of the fixed rate necessary to reduce the asset value
to residual or scrap value in the given life-term. Using the standard
notation, we may formulate the following equations:
V₁ = V(1 - d); V₂ = V₁(1 - d) = V(1 - d)(1 - d);
V₃ = V₂(1 - d) = V(1 - d)(1 - d)(1 - d); whence
Vₙ = V(1 - d)ⁿ, which solved for 1 - d gives
______
1 - d = ⁿ√Vₙ/V) , and, solving for d, we get
_____
(2) d = 1 - ⁿ√(Vₙ/V)
While complex, the formula is readily solvable by means of logarithms.
For an asset costing $150 with a service life of 5 years and a
scrap value of $50, the rate is found by the above formula to be
approximately 19.726%.
_______
d = 1 - ⁵√(50/150) = .19726
The appraisal schedule is, therefore, as follows:
=======+==============+============+=================+==============
| Fixed | | | Total
Age in | Depreciation | Periodic | Depreciated or | Accumulated
Periods| Rate % |Depreciation| Appraised Value | Depreciation
-------+--------------+------------+-----------------+--------------
0 | ..... | $ ..... | $150.00 | $ .....
1 | 19.726 | 29.59 | 120.41 | 29.59
2 | 19.726 | 23.75 | 96.66 | 53.34
3 | 19.726 | 19.07 | 77.59 | 72.41
4 | 19.726 | 15.32 | 62.27 | 87.73
5 | 19.726 | 12.27 | 50.00 | 100.00
| | ------ | |
| | 100.00 | |
-------+--------------+------------+-----------------+--------------
The following chart shows graphically the appraised values and the
accumulated depreciation:
[Illustration: _Graphic Chart—Fixed Percentage of Diminishing Value
Method_]
(b) Changing Percentage of Cost Less Scrap Method
Similar in effect to the method just explained is the “Changing
Percentage of Cost Less Scrap” or the “Sum of Expected Life-Periods”
method. Here, the base remains fixed, but the periodic depreciation
rates change. Each depreciation rate is a fraction the common
denominator of which is the sum of the expected life-periods as viewed
from the beginning of each successive period, and the numerator of
which is the expected life for the period in question. For example, an
asset of which the expected life is 5 periods has at the beginning of
each successive period expected life-terms of 4, 3, 2, and 1 periods
respectively, making a total of 15 which becomes the common denominator
of the fractions whose numerators are 5, 4, 3, 2, and 1 respectively;
i.e., the changing depreciation rates are ⁵/₁₅, ⁴/₁₅, ³/₁₅, ²/₁₅, and
¹/₁₅. For an asset costing $150 with expected life of 5 periods and
scrap value of $50, the appraisal schedule would be as follows:
=========+==============+==============+==============+=============
Age | Changing | | Depreciated | Total
in | Depreciation | Periodic | or Appraised | Accumulated
Periods | Rate % | Depreciation | Value | Depreciation
---------+--------------+--------------+--------------+-------------
0 | ..... | $ ..... | $150.00 | $ .....
1 | 33⅓ | 33.33 | 116.67 | 33.33
2 | 26⅔ | 26.67 | 90.00 | 60.00
3 | 20 | 20.00 | 70.00 | 80.00
4 | 13⅓ | 13.33 | 56.67 | 93.33
5 | 6⅔ | 6.67 | 50.00 | 100.00
---------+--------------+--------------+--------------+-------------
A comparison of this appraisal schedule with that of the fixed
percentage of diminishing value method shows that this method charges
more depreciation during the early life-periods and less during the
later periods. The general effect of this method and its significance
are discussed in Chapter X where the relative merits of the various
methods are considered. The graph for the sum of expected life-periods
method is not shown as it differs little from that of the fixed
percentage of diminishing value method on page 158.
(c, d) Arbitrary Methods
The two other arbitrary types of this variable percentage method
are hardly to be classed as methods as they do not rest on any law
according to which they may be operated. Under them arbitrary amounts
are charged to depreciation each period, the only controlling principle
being that in the one case these periodic amounts increase from period
to period, while in the other case they decrease. In the one case,
therefore, the appraisal schedule would be similar as to its “Periodic
Depreciation” column to those of the two methods just explained,
excepting that the column must be reversed, i.e., read from the bottom
upward. In the other case, the appraisal schedule would be exactly
similar to those just shown. Within the restriction that they must be
increasing or decreasing amounts for succeeding periods and that the
total depreciation must be charged off within the estimated life-period
of the asset, the periodic depreciation charges are, under these
methods, purely arbitrary, neither based on fact nor logic.
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