1. Houses are fixed assets and must be depreciated. (1) The depreciation period is 20 years and the residual value rate is 5. (2) Depreciation formula Annual depreciation amount = original value of fixed assets * (1 - residual value rate) / depreciation life Monthly depreciation amount = annual depreciation amount / 12 2. Land is an intangible asset and needs to be amortized. (1) According to Article 65 of the "Regulations for the Implementation of the Enterprise Income Tax Law", the intangible assets referred to in Article 12 of the Enterprise Income Tax Law refer to those held by an enterprise for the purpose of producing products, providing services, leasing or operating and managing, and without Non-monetary long-term assets in physical form, including patent rights, trademark rights, copyrights, land use rights, non-patented technology, goodwill, etc. Article 67 The amortization expenses of intangible assets calculated according to the straight-line method are allowed to be deducted. The amortization period of intangible assets shall not be less than 10 years. As an investment or transferred intangible asset, if the useful life is stipulated in relevant laws or contracts, it may be amortized in installments according to the prescribed or agreed useful life. (2) Amortization formula Annual amortization = value of intangible assets/amortization period Monthly amortization = annual amortization/12