Straight-line method : Under this method  fixed rate of depreciation is charged on the original value of the asset, over its useful life depreciation. Here, Depreciation is   charging an equal amount of depreciation expense for a tangible asset in each year of useful life. Here, the cost of the asset is spread uniformly over the life years by writing off a fixed amount every year.

 WDV (Written Down Value Method) : It is also known as Reducing Balance or Reducing Instalments Method or Diminishing Balance Method. Under this method, the depreciation is calculated at a certain fixed percentage each year on the book value of the asset (Net Asset Value) . In contrast, the amount of depreciation in WDV method diminishes every year