Cost Segregation:
The Velocity of Wealth
IRC §1245 / §1250 | Updated April 2026 | IRC-compliant strategy
Don't wait 39 years.
Normally, you depreciate commercial buildings over 39 years and residential rentals over 27.5 years. Cost Segregation is a sophisticated study that breaks your building into its components—like flooring, lighting, landscaping, and cabinetry. These are reclassified as 5, 7, or 15-year assets, allowing you to take massive deductions today instead of decades from now.
When combined with Bonus Depreciation, you can often write off 20-30% of a building's entire purchase price in the first year.
The $1M Building Example
Scenario: You buy a $1M commercial building.
- Standard 39-Year Depreciation: $25,641/year
- Cost Segregation Study results: $250,000 reclassified as 5-year assets.
- First Year Deduction (with 60% Bonus): $150,000 + $19,230 = $169,230
- Tax Wealth Reclaimed (at 37% bracket): $62,615
You've turned a $25k deduction into a $169k deduction by simply reclassifying the building's components.
Asset Categories
A professional study identifies three main "accelerated" buckets:
- 5-Year Property: Personal property like carpet, specialty lighting, cabinetry, and equipment.
- 7-Year Property: Office furniture and certain fixtures.
- 15-Year Property: Land improvements like parking lots, fences, and landscaping.
Implementation Steps
- Purchase: Acquire an investment property or perform a significant renovation.
- Order a Study: Hire an engineering-based cost segregation firm to audit the property.
- Review Report: Ensure the study breaks down assets into proper MACRS classes.
- Catch-up (Optional): If you've owned the building for years, use Form 3115 to claim "catch-up" depreciation without amending old returns.
Audit Protection
CRITICAL COMPLIANCE
The IRS "Cost Segregation Audit Techniques Guide" requires a detailed engineering-based approach. "Rule of thumb" estimates or simple CPA spreadsheets are often disallowed in audits. Always use a specialist firm that provides a certified engineering report.
Bought a building recently?
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