In Written Down Value Method, the rate of depreciation is predetermined. This is done by deducting the amount of depreciation charged before from the balance of cost of asset (Cost of Asset-Estimated Scrap Value). In simple words, in the first year the amount of depreciation charged is high and it gradually starts decreasing during the subsequent years.

Formula to calculate:

Depreciation = 1- 

N= number of years

R= Residual/Scrap Value

C=Cost of the asset

The main benefit of this method is that it recognises this fact that in the initial phase of an asset, costs of maintenance, repairs etc. are less which goes on increasing with the progressing life of the asset. Thus, by charging higher amount of depreciation in the initial years and gradually decreasing the amount of depreciation counterbalance both the lower amount of repairs and maintenance cost in the initial years and the gradual increase later on. It can be noted here that the written down value can never be zero.