Cost segregation can accelerate depreciation by identifying portions of a building that qualify for shorter recovery periods. The headline tax deduction can be attractive, but the decision should be evaluated in context.
What the study changes
A cost-segregation study does not create new depreciable basis. It analyzes existing basis and assigns qualifying components to shorter-lived asset classes, often including five-year, seven-year, and fifteen-year property.
The timing benefit depends on then-current depreciation rules, placed-in-service dates, and the quality of the study.
Can you use the resulting loss?
An accelerated deduction is most valuable when the taxpayer can use it. Passive-activity rules, basis, at-risk limits, real-estate-professional status, material participation, and other limitations may suspend part or all of the loss.
- Estimate the current-year deduction.
- Estimate how much is currently usable.
- Model future income and suspended losses.
- Consider state conformity to federal depreciation rules.
How long will you hold the property?
Accelerating depreciation reduces adjusted basis and can increase gain or depreciation recapture on sale. That does not automatically eliminate the benefit—the time value of money can still be meaningful—but the expected holding period and exit strategy belong in the analysis.
Quality and documentation matter
A defensible study should identify methodology, source records, assumptions, asset classifications, and the basis for allocations. A low-cost report with weak documentation may create more audit risk than value.
For property placed in service in an earlier year, implementation may require an accounting-method change rather than an amended return.