우리나라에서 최선의 감가상각방법 선택

Since the depreciation method affects taxable income in future periods, the companies try to minimize the present worth of future tax payments by choosing a depreciation method optimally. This paper reexamines the preference between straight-line(SL) and declining balance(DB) methods stipulated by Korean Corporate Tax Act, because the latter has a different and unique form from ones of USA and Japan. By relaxing the assumption of positive taxable income with uncertain revenue, two depreciation methods are compared and discussed. Also, the situations under progressive tax structure and where net-operating losses may be carried-forward in time are examined and illustrated with numerical examples. Under these situations, this paper formulates models and establishes conditions that allow SL method to be preferred over DB method.