Depreciation Methods :
Depreciation method is use to calculate depreciation of assets.In this article, i will show you that how we calculate depreciation by using different methods, the following methods are use to calculate deprecation.
These depreciation methods with examples are as follow.
 Straight line or fixed installment method.
 Units of output method.
 Declining balance method.
 Sum of year digits method.
1.Straight line or fixed installment method of Depreciation;
This is the simplest and most widely used depreciation methods for computing the depreciation of an asset.it is also called as fixed installment method. This method is very useful when usage of an asset is fairly uniform from year to year.
Under this method the residual or scrap value of the asset is deducted from the cost and divided by the number of year of useful life. The resultant is the annual depreciation expenses, which are charged to every year’s profit.
The annual depreciation is calculated as under:
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Annual depreciation = cost – residual value/ year of useful life.
Suppose if the cost of a motor is rs.20, 000 its useful life is 4 years and scrap value is Rs.2000, the annual depreciation will be (20,000 2000)= 18,000 divided by 4 = Rs.4500.
The fixed amount is charged to every year’s profit as depreciation and no consideration will be given to the volume of use or productivity of asset concerned.
Example:
On Ist January 2014 a motor car purchased worth Rs.20,000
Estimated life: 4 years
Scrap value: Rs.2000
Find the amount of depreciation under straight line method.
Solution:
Cost of motor Rs.20, 000
) scrap value Rs.2000
Depreciable value Rs.18, 000
Estimated life 4 years
Annual depreciation =(18000/4) Rs.4,500
Depreciation schedule of the motor car
Year 
Cost of motor car 
Annual depreciation 
Accumulated depreciation 
Book value of the motor car 
2013 2014 2015 2016

20,000 20,000 20,000 20,000

4,500 4,500 4,500 4,500

4,500 9,000 13,500 18,000 
15,500 11,000 6,500 2,000 
2. Units of output method of Depreciation:
This is also called as production method. Under this depreciation methods the depreciation is calculated on the basis of use or productivity of the asset. If the asset is used more or gave more production in any year more depreciation will charged and if the use or production is less in any year less depreciation will be charged. The method is advocated on the ground group that the war and tear of the assets like motor vehicles and many other types of machinery depends upon its use and not merely the passage of time.
However this method is not suitable in all types of assets under this depreciation method the use of asset is based on working hour, production units mileage convered or period spend etc
The method is calculated as under:
Annual depreciation = cost scrap value / estimated units of output
Example:
Car purchased on ist January 2013: Rs.400,000
Estimated working life: 200,000
Scrap value: Rs.100,000
The car covers 40,000 kilometer in 2013,
50,000 k.m in 2014, 35,000 k.m in 2015
32,000k.m in 2016, 43,000k.m in 2017
Calculate rate of depreciation per kilometer of a car.
Solution:
Calculation of per year kilometer depreciation rate.
Cost of car Rs. 400,000
)Scrap value Rs. 100,000
Depreciation value Rs. 300,000
Estimated working life 200,000 km
Depreciation rate (30,000 divided by 200,000) Rs. 1.50 per km
Schedule of annual depreciation
year 
Cost 
Kilometer 
Rate per km 
Depreciation expenses 
Accumulated depreciation 
Book value 
2013 2014 2015 2016 2017 
400,000 400,000 400,000 400,000 400,000 
40,000 50,000 35,000 32,000 53,000 
Rs.1.50 Rs. 1.50 Rs. 1.50 Rs. 1.50 Rs. 1.50 
60,000 75,000 52,500 48,000 64,500 
60,000 135,000 187,000 235,000 3000,000 
340,000 265,000 213,000 165,000 100,000 
3. Declining Balance Method of Depreciation:
This depreciation methods associates the high amount of depreciation expense in the initial year when the asset is new and its capacity is more and low in the later year. When the asset is older and capacity is less.
This depreciation methods is based on the assumption that the efficiency and output of the asset is usually higher in the initial years and its repair cost is lower as compared to the period when it becomes older under this method the rate of depreciation is charged on the declining balance instead of original cost. The yearly rate of depreciation is calculated as under.
R= rate of depreciation
N= estimated life
S= residual value/scrap value
C= original cost
Example:
Suppose on ist January 2013 the cost of an asset is Rs.1000,000 was purchased ,useful life is 3year and residual value is Rs.64,000.
The yearly depreciation will be calculated as under:
Solution:
R=1 [s/c]1/n
R=1 [64,000/1000,000]1/3
R=1 40/100
R=6/100 or 60%
Schedule of depreciation of the machine
Year  Cost of machine  Rate of deprecation  Amount if depreciation  Accumulated depreciation  Book value 
2013
2014 2015 
1000,000
1000,000 1000,000 
60%
60% 60% 
600,000
240,000 96,000 
600,000
840,000 936,000 
400,000
160,000 64,000 
4. Sum of year digits method of Depreciation:
This depreciation methods also called allocates the large portion of the depreciation of the asset in the earlier years of it use. Under this method the years of useful life of the asset are added, their sum become the denominator of the series and the number of years its numerator which are applied against the depreciation cost of the asset,
For instants, estimated life of the asset is 4years .the sum of the years digits will be 1+2+3+4=10 this will be denominator and 1,2,3 and 4 will be numerator .
This rate of depreciation will be applied in reverse order i.e, 4/10 for 1st year and 3/10 for 2^{nd} year,2/10 for 3^{rd} year and 1/10 for 4^{th} year.
Example:
Motor car worth: Rs.50, 000
Useful life = 5 years
Residual value= Rs.5, 000
Solution:
Calculation of depreciation rates
Cost of assets Rs.50, 000
Residual value (5,000)
Depreciable value 45,000
Useful life of the asset 5 years
Sum of the year’s digits 1+2+3+4+5= 15years
Series of rates: 1^{st} year=5/15 2^{st} year=4/15 3^{st} year=3/15
4^{st} year=2/15 5^{st} year=1/15
Year  Cost of Motor  Rate of deprecation  Depreciation Expense  Accumulated depreciation  Book value 
1 2 3 4 5 
50,000
50,000 50,000 50,000 50,000 
5/15 4/15 3/15 2/15 1/15 
15,000
12,000 9,000 6,000 3,000 
15,000
27,000 36,000 42,000 45,000 
35,000
23,000 14,000 8,000 5,000 