Sum of year digits is a form of accelerated depreciation. Using this methodology we have greater depreciation in the earlier years and less in the later years. Below is a simple sample which shows the cost of asset, life and the salvage value. For the same we will try to calculate depreciation using ‘sum of year digit’.
|
Cost of Asset |
10000 Rs |
|
Life of Asset |
5 Years |
|
Salvage Value |
2000 Rs |
Table: - Sample example
So below are the steps to calculate depreciation using ‘sum of year digit’.
Sum of year digit depreciation = (Cost of Asset – Salvage value) * Factor
To calculate factor below is the formula.
Factor = (Year for which depreciation is calculated) / (Total of the number of years)
Currently the total of the number of years is 15 (1+2+3+4+5). So below is the calculation of factor for five years. 1st year factor is (5/15=0.33), 2nd year factor is (4/15=0.26), 3rd year factor is (3/15=0.2) and so on. In order to calculate depreciation we need to multiply this factor to the difference between cost of asset and salvage value. So below table shows a detail calculation for the same.
|
Year |
(Cost of asset – Salvage value) * factor |
Depreciation for the year |
|
First |
(10000-2000) * (5/15) |
2666.67 |
|
Second |
(10000-2000) * (4/15) |
2133.33 |
|
Third |
(10000-2000) * (3/15) |
1600.00 |
|
Fourth |
(10000-2000) * (2/15) |
1066.67 |
|
Fifth |
(10000-2000) * (1/15) |
533.33 |
Table: - Depreciation calculation using sum of year

Figure: - SYD in action