If a company normally spreads out the wear and tear of an asset over 22 years but decides to change it to 15 years, here's what the accountant should do Question 4 options: Make adjustments to the depreciation recorded in previous years. Calculate this year's depreciation by multiplying the asset's value by 15/20. Compute current year depreciation as (carrying amount - residual value) divided by 15 years. Make changes to the amount of depreciation recorded at the beginning of the year