What Is Component Depreciation?
Component depreciation is an accounting method where a single, large asset is divided into its distinct, identifiable components, and each component is then depreciated separately. Instead of treating an entire building as one asset with a single depreciable life (e.g., 39 years for nonresidential real property under the Modified Accelerated Cost Recovery System, or MACRS, as detailed in IRS Publication 946), component depreciation allows you to assign different useful lives to elements like the roof, electrical systems, plumbing, walls, and HVAC units.
For example, the structural shell of a building might have a 39-year life, but the carpet might have a 5-year life, and the HVAC system a 10-year life. By depreciating these components over their shorter actual useful lives, a business can often claim larger depreciation deductions earlier on. This technique is often used in cost segregation studies, which identify and reclassify building components to accelerate depreciation, adhering to IRS guidance found in documents like the Cost Segregation Audit Techniques Guide.