Depreciation Fund Method or Sinking Fund Method :

Under this method, funds are made available for the replacement of asset at the end of its useful life. The depreciation remains the same year after year and is charged to Profit and Loss account every year through the creation of depreciation fund. The amount of annual depreciation is invested in good securities bearing interest at a specified rate. The aggregate amount of interest and annual provision is invested every year. When the asset is completely written off or is to be replaced, the securities are sold and the amount so realised by selling securities is used to replace the old asset.