1, minimum depreciation period of buildings, 20 years for buildings. The depreciation of building materials refers to the problems of material wear and tangible loss in the process of building use, which leads to the loss of building value, mainly including natural aging, corrosion, weathering, foundation settlement and so on. , including normal use wear and accidental damage, delayed maintenance damage and other factors.

2. Legal basis: Article 60 of the Regulations for the Implementation of the Enterprise Income Tax Law of People's Republic of China (PRC), unless otherwise stipulated by the competent departments of finance and taxation of the State Council, the minimum depreciation period of fixed assets is as follows:

(a) houses and buildings, for 20 years;

(2) Aircraft, trains, ships, machines, machinery and other production equipment, 10 year;

(3) Appliances, tools and furniture. 5 years related to production and business activities;

(4) Four years for vehicles other than airplanes, trains and ships;

(five) electronic equipment, for 3 years.

2. What is the formula for building depreciation?

The calculation method of house depreciation expense is clearly stipulated in relevant laws, and the depreciation of fixed assets such as houses adopts the average life method, that is, the fixed depreciation method. The calculation formula is that when consumers buy old houses, they can also use the depreciation method to find out the approximate value of the old houses they buy. The formula is: old house price = cost-annual depreciation expense multiplied by service life. Of course, there are many factors to be considered in determining the house price, such as the location of the lot where the house is located, the building area of the house, the level and orientation of the building, etc.