How does rental property depreciation work?
Depreciation lets you deduct the cost of a building over its useful life even though the building does not actually wear out at the same pace. Residential rental property has a 27.5-year recovery period under MACRS. Commercial rental property has a 39-year period. Land is never depreciable.
On a $500,000 residential rental with $400,000 allocated to building (and $100,000 to land), the annual depreciation is $400,000 / 27.5 = $14,545. That deduction offsets rental income on Schedule E and can flow into a net loss that, depending on activity classification and income, may offset other income.
Cost segregation studies reclassify components of the building (carpet, cabinets, appliances, parking lot, landscaping, certain interior fixtures) into shorter recovery periods. Combined with bonus depreciation, a properly executed cost segregation study on a $500,000 residential rental can produce $50,000 to $120,000 of first-year deductions instead of the standard $14,545.