How does cost segregation reduce the tax burden on a newly acquired commercial property?

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In practice, a cost segregation study reviews construction components, engineering details, and tax classifications to separate assets such as certain dedicated electrical, plumbing, specialty finishes, and site improvements from the building shell.

Historically, the framework comes from Modified Accelerated Cost Recovery System (MACRS) under IRC § 168. Subsection 168(a) provides that depreciation is determined using the applicable method, recovery period, and convention. For nonresidential real property, Subsection 168(b)(3)(A) requires straight-line depreciation, and Subsection 168(c) assigns a 39-year recovery period. By contrast, many reclassified assets fall into 5-, 7-, or 15-year classes under § 168(e) and Rev. Proc. 87-56 principles summarized in the MACRS guidance.

How cost segregation reduces the tax burden on a newly acquired commercial property:

1. It accelerates depreciation deductions. Instead of depreciating all acquisition basis over 39 years, qualifying components may be depreciated over 5, 7, or 15 years, producing larger deductions in earlier years.
2. It can unlock bonus depreciation. Qualified property with a recovery period of 20 years or less may qualify for § 168(k) bonus depreciation, which applies after any § 179 deduction and before regular MACRS. This is the core of cost segregation accelerated depreciation.
3. It may increase cash flow immediately after acquisition. Earlier deductions reduce taxable income sooner, which can preserve cash for leasing, renovations, debt service, or operations. That timing benefit is often the most important of the cost segregation study real estate tax benefits.
4. It can identify 15-year land improvements separately from the building. Parking lots, sidewalks, landscaping, fencing, and similar improvements are often not 39-year building property and may qualify for faster recovery.
5. It may support method-change catch-up deductions if prior depreciation was incorrect, although accounting method rules and procedural requirements must be followed carefully.

Before the One Big Beautiful Bill Act (OBBBA), bonus depreciation under § 168(k) was phasing down for property acquired before January 20, 2025: 60% for 2024, 40% for 2025, and 20% for 2026. After OBBBA, 100% bonus depreciation was restored permanently for qualified property acquired after January 19, 2025. That change materially increases the value of a cost segregation study commercial real estate acquisition because more short-life components can now be fully deducted in the placed-in-service year, assuming all § 168(k) requirements are met.

OBBBA also added new § 168(n) treatment for Qualifying Production Property (QPP), a separate 100% expensing rule for certain nonresidential real property used in qualified production activities, effective for property placed in service after July 4, 2025. That rule is distinct from traditional commercial property tax depreciation and does not replace ordinary cost segregation analysis for most acquisitions.

The main takeaway is that cost segregation reduces tax burden by converting part of a building purchase into shorter-life assets eligible for faster depreciation and, now more often, full first-year expensing. The benefit is strongest when the analysis is technically sound, well documented, and aligned with § 168 classification rules. Because these determinations are highly technical, property owners should consult a qualified tax professional or cost segregation specialist before claiming accelerated depreciation benefits.

How BT Can Help

For more than four decades, Bennett Thrasher has provided businesses and individuals with strategic business guidance and solutions through professional tax, audit, advisory, and business process outsourcing services. Contact Trey Webb, partner in charge of Bennett Thrasher’s Real Estate and Hospitality Tax Group, or call us at 770.396.2200.

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