system of depreciation for tax purposes mandated by the Economic Recovery Act (ERA) of 1981 and modified by the Tax Reform Act of 1986. The type of property determines its class. Instead of providing statutory tables, prescribed methods of depreciation are assigned to each class of property. For 3, 5, 7, and 10 year classes, the relevant depreciation method is the 200% declining balance method. For 15 and 20 year property, the appropriate method is the 150% declining balance method switching to the STRAIGHT-LINE method when it will yield a larger allowance. For residential rental property (27.5 years) and nonresidential real property (31.5 years), the applicable method is the straight-line method. A taxpayer may make an irrevocable election to treat all property in one of the classes under the straight-line method. Property is statutorily placed in one of the classes. The purpose of ACRS is to encourage more capital investment by businesses. It permits a faster recovery of the asset's cost and thus provides larger tax benefits in the earlier years.

a system used in the United States for calculating depreciation in a way that reduces tax liability