· Accumulated depreciation formula after 1 st year = Acc depreciation at the start of year 1 + Depreciation during year 1. = 0 + $20,000. = $20,000. Therefore, after 2 nd year it will be –. Accumulated depreciation formula after 2 nd year = Acc depreciation at the start of year 2 + Depreciation during year 2. = $20,000 + $20,000.