Is it necessary for a business to use the same method of computing depreciation for all classes of its depreciable assets?

Under IFRS, when a company chooses the revaluation model as its accounting policy for measuring property, plant, and equipment, which of the following statements is correct? a. When an asset is revalued, the entire class of property, plant, and equipment to which the asset belongs must be revalued. b. When an asset is revalued, individual assets within a class of property, plant, and equipment to which that asset belongs can be revalued. c. Revaluations of property, plant, and equipment must be made every three years. d. An increase in an asset’s book value as a result of the first revaluation must be recognized as a component of profit and loss.

What is qualifying assets for depreciation in taxation/accounting? Also, how are useful lives and section 179 expense used?

What are the benefits of calculating depreciation differently for financial reports and for tax purposes?