Income Tax Act Article 51
Fixed assets must be depreciated by using the straight-line method, fixed percentage on diminishing book value method, sum-of-years`-digits method, production method, working-hour method or other depreciation methods approved by the competent authority. Where the assets belong to different categories, the calculation of depreciation may combine the computations based on the respective categories.The service life of various kinds of fixed assets shall be such as is prescribed in the Table of Service Life of Fixed Assets; however, the service life of equipment installed to prevent water pollution or air pollution may be shortened to two years.In the computation of depreciation of each kind of fixed asset, the service life of such fixed assets shall not be shorter than the minimum years of service life specified in the said table unless special permission has been granted by the Government to adopt the shortening as an incentive.
中文原文 所得稅法第51條
固定資產之折舊方法，以採用平均法、定率遞減法、年數合計法、生產數量法、工作時間法或其他經主管機關核定之折舊方法為準；資產種類繁多者，得分類綜合計算之。
各種固定資產耐用年數，依固定資產耐用年數表之規定。
但為防止水污染或空氣污染所增置之設備，其耐用年數得縮短為二年。
各種固定資產計算折舊時，其耐用年數，除經政府獎勵特予縮短者外，不得短於該表規定之最短年限。
各種固定資產耐用年數，依固定資產耐用年數表之規定。
但為防止水污染或空氣污染所增置之設備，其耐用年數得縮短為二年。
各種固定資產計算折舊時，其耐用年數，除經政府獎勵特予縮短者外，不得短於該表規定之最短年限。