Double Declining Balance Method of Depreciation
Double Declining Balance Method of Depreciation:
Learning Objectives:

Define and explain the double declining balance method of depreciation.
Double declining balance method is another type of accelerated depreciation method followed generally in USA. The depreciation expense is computed by multiplying the asset cost less accumulated depreciation by twice the straight line rate expressed in percentage. No provision is made for salvage value of the asset.
Double declining balance rate is found by using the following formula:
Double Declining Balance Rate = (100%/Years of Useful Life) × 2 
Example:
A printing machine is purchased for $20,000 on January 1991. The scrap value is estimated at $2,000 at the end of 5 years useful life of the asset.
Required: Calculate the annual depreciation charge by applying double declining balance method
Solution:
Depreciation rate (100%/5) × 2 = 40%
The following table shows the depreciation for the five year period:
End of Year  Asset Cost  Rate depreciation  Amount depreciation  accumulated depreciation  Book Value 
1  20,000  40%  8,000  8,000  12,000 
2  20,000  40%  4,800  12,800  7,200 
3  20,000  40%  2,880  15,680  4,320 
4  20,000  40%  1,728  17,408  2,592 
5  20,000  40%  1,037  18,445  1,555 
In applying this method the entire original cost can never be depreciated. There is bound to be some balance though only a small one. In this example, a salvage value of $1,555 is automatically provided for. However, an asset should not be depreciated below it salvage value of $2,000. Therefore the depreciation expenses at the end of fifty year should be $592 and not $1,037