DDB:
Returns the depreciation of an asset for a specified period by using the doubledeclining balance method or some other method that you specify
The DDB function calculates the depreciation of an asset for a specified period by using the doubledeclining balance method or some other method that you specify.
The arguments for the DDB function are:
Argument

Required?

Description

cost 
Required 
The initial cost of the asset. 
salvage 
Required 
The value at the end of the depreciation (the salvage value of the asset). This value can be 0. 
life 
Required 
The number of periods over which the asset is being depreciated (the useful life of the asset). 
period 
Required 
The period for which you want to calculate the depreciation. Period must use the same units as life. 
factor 
Optional 
The rate at which the balance declines. If factor is omitted, it is assumed to be 2 (the doubledeclining balance method). 
• The doubledeclining balance method computes depreciation at an accelerated rate. Depreciation is highest in the first period and decreases in successive periods. DDB uses the following formula to calculate depreciation for a period: 
Min( (cost  total depreciation from prior periods) * (factor/life), (cost  salvage  total depreciation from prior periods) ) 
Change factor if you do not want to use the doubledeclining balance method. 
• Use the VDB function if you want to switch to the straightline depreciation method when depreciation is greater than the declining balance calculation. 
The DDB function calculates the depreciation of an asset for a specified period by using the doubledeclining balance method or some other method that you specify.