According to the "People's Republic of China **** and the State Enterprise Income Tax Law Implementation Regulations"
Article 60 In addition to the State Council, the competent authorities in charge of finance and taxation provide otherwise, the minimum years for the calculation of depreciation of fixed assets are as follows:
(a) houses, buildings, 20 years;
(b) aircraft, trains, ships, machines, machinery and other production equipment. 10 years;
(iii) apparatus, tools, furniture, etc., related to production and business activities, 5 years;
(iv) means of transportation other than airplanes, trains and ships, 4 years;
(v) electronic equipment, 3 years.
Note: According to '(v) electronic equipment, for 3 years', that is, electronic equipment to calculate the depreciation of the minimum age of 3 years, can not be lower than the minimum depreciable life under the tax law, otherwise tax adjustments; can be higher than 3 years, but once determined shall not be changed arbitrarily. No tax adjustment is required.
Two, to have an estimated net residual value?
Article 59 of the depreciation of fixed assets calculated in accordance with the straight-line method, are allowed to deduct.
Enterprises should be based on the nature and use of fixed assets, a reasonable determination of the estimated net residual value of fixed assets. Once determined, the estimated net residual value of fixed assets shall not be changed.
Note: the estimated net salvage value by the enterprise in accordance with the actual situation, the requirement of a reasonable estimate, by the reason for when, but the estimated net salvage value, once determined, shall not be changed. I suggest to reasonably determine a certain, because generally fixed assets will have a residual value, the general residual value rate of 5% of the original value of fixed assets.