Cost Segregation Studies: How Real Estate Owners Unlock Six-Figure Deductions

If you own commercial or residential rental property, you are likely depreciating the building over 27.5 or 39 years. That means the bulk of your tax benefit trickles in over nearly four decades. A cost segregation study rewrites that timeline — legally — by identifying building components that can be depreciated over 5, 7, or 15 years instead.

What a cost segregation study actually does

An engineering-based analysis breaks your property into its constituent systems: electrical, plumbing, fixtures, flooring, specialty equipment, and land improvements. Each component is then assigned to the appropriate recovery period under MACRS. Components with shorter lives qualify for accelerated — and often bonus — depreciation, producing a large deductible loss in the year placed in service.

• 5-year property: carpeting, decorative lighting, specialized fixtures, security systems
• 7-year property: office furniture, fixtures, and equipment used in the building
• 15-year property: landscaping, parking lots, sidewalks, and fencing (land improvements)
• 27.5/39-year property: the structural shell and permanent building components

The numbers: what owners typically capture

On a $1M commercial building, a study commonly reclassifies 20–30% of the basis into shorter-life categories. With bonus depreciation in effect, that can translate into $150,000–$300,000 of accelerated deductions in year one — deductions that would otherwise have been spread across decades.

Is it IRS-compliant?

Yes — when performed correctly. The IRS Audit Techniques Guide explicitly recognizes engineering-based cost segregation as a valid method. The key is using a study built on construction engineering principles, not rough estimates, and maintaining the documentation that supports each reclassification.

Who benefits most

• Owners of recently purchased or built commercial property
• Investors who have completed major renovations or build-outs
• Landlords of residential rental portfolios with multiple units
• Business owners who own the building they operate from

Next steps

Cost segregation is one of the highest-impact strategies available to property owners — and it is often missed entirely by compliance-focused accountants. If you own real estate placed in service in the last several years, a look-back study may still apply. Book a free discovery call to learn how cost segregation works and whether a Comprehensive Consultation makes sense for your property.