Cost Segregation Studies for Small Business Commercial Property

By Yarik Yarosh, CPA ·September 5, 2026 ·4 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

Commercial buildings are depreciated over 39 years under MACRS (27.5 years for residential rental). That means a $500,000 building generates only $12,821/year in depreciation ($500,000 / 39). A cost segregation study reclassifies certain building components into shorter depreciation categories: 5-year property (carpeting, decorative fixtures, special electrical), 7-year property (furniture, office equipment built into the building), and 15-year property (land improvements like parking lots, landscaping, sidewalks). The reclassified components can then be deducted using bonus depreciation (100% under OBBBA for property placed in service after 2025, restored from the phase-down), generating a massive first-year deduction.

✓Key takeaway

How cost segregation works:

Without a cost segregation study:

$500,000 building (excluding land)
39-year straight-line depreciation
Annual deduction: $12,821
After 5 years: $64,103 in total depreciation

With a cost segregation study: The study identifies and reclassifies:

5-year property: 15-25% of building cost ($75,000-$125,000)
- Carpet and vinyl flooring
- Decorative lighting
- Specialized electrical (dedicated circuits for equipment)
- Signage
- Window treatments
- Accent walls and decorative finishes
7-year property: 5-10% of building cost ($25,000-$50,000)
- Built-in cabinetry
- Specialized plumbing (for specific equipment)
15-year property: 10-20% of building cost ($50,000-$100,000)
- Parking lot and paving
- Landscaping
- Sidewalks and curbing
- Exterior lighting
- Fencing
- Site drainage
Remaining 39-year property: 50-70% of building cost ($250,000-$350,000)
- Structural walls, roof, foundation, HVAC (central), basic electrical, basic plumbing

Year 1 deduction with bonus depreciation:

5-year property ($100,000): 100% bonus depreciation = $100,000 deduction
7-year property ($30,000): 100% bonus depreciation = $30,000 deduction
15-year property ($70,000): 100% bonus depreciation = $70,000 deduction
39-year property ($300,000): straight-line = $7,692 deduction
Total Year 1: $207,692 (vs. $12,821 without cost segregation)
Additional first-year deduction: $194,871

Tax savings at 32% marginal rate: $194,871 x 32% = $62,359

Cost of a study: $5,000-$15,000 for a typical small commercial property. The ROI is dramatic: spend $10,000 to save $62,000+ in federal tax.

Who should get a cost segregation study:

Owners of commercial property purchased or built for $300,000+
The study is most valuable in the purchase/construction year (bonus depreciation on the full reclassified amount)
Can be done retroactively on property already in service (IRS allows a “look-back” study with a Section 481(a) catch-up adjustment, no need to amend prior returns)
NOT worthwhile for very small properties (under $200,000 building value) because the study cost exceeds the marginal tax savings

Depreciation recapture warning: When the property is sold, the accelerated depreciation is recaptured:

Personal property (5, 7-year) recapture under IRC 1245: ordinary income rate (up to 37%)
Real property (15, 39-year) recapture under IRC 1250: 25% rate on unrecaptured Section 1250 gain
The cost segregation study defers tax, it does not eliminate it
If the owner plans to hold the property long-term (10+ years) or use a 1031 exchange: the deferral is very valuable (time value of money)

When does cost segregation make sense for small business?

Hypothetical example

Round numbers. A dentist buys a standalone commercial building for their practice. Purchase price: $600,000. Land value: $100,000. Building value: $500,000. The dentist plans to hold the property for 15+ years.

Without cost segregation:

Annual depreciation: $500,000 / 39 = $12,821
Year 1 tax savings (35% bracket): $4,487
10-year total depreciation: $128,210

With cost segregation (study cost: $8,000): Reclassified property:

5-year: $100,000 (dental-specific electrical, plumbing for treatment rooms, decorative finishes, flooring)
7-year: $25,000 (cabinetry, built-in storage)
15-year: $75,000 (parking lot, landscaping, signage, exterior lighting)
39-year: $300,000 (remaining structure)

Year 1 deductions:

5-year (bonus): $100,000
7-year (bonus): $25,000
15-year (bonus): $75,000
39-year (straight-line): $7,692
Total: $207,692

Year 1 tax savings: $207,692 x 35% = $72,692 Minus study cost: $8,000 Net Year 1 benefit: $64,692

Without the study, the dentist would have claimed $12,821 and saved $4,487. The cost segregation study generated an additional $60,205 in net tax savings in Year 1.

Present value comparison (10 years, 5% discount rate): Over 10 years, both approaches deduct the same total amount of depreciation. But the cost segregation study front-loads the deduction. The present value of the tax savings is approximately $20,000-$30,000 higher with cost segregation because the money saved in Year 1 can be invested or used for 10+ years before the “catch-up” happens (lower depreciation in later years).

If the dentist sells in Year 10 via 1031 exchange: The accelerated depreciation rolls into the replacement property. The recapture is deferred until the dentist exits real estate entirely (or passes the property to heirs, who receive a stepped-up basis at death under IRC 1014, eliminating the recapture entirely).

Illustrative numbers only, not a real client and not advice for your facts.

Want this checked against your own situation?

Start with a Diagnostic: a CPA licensed in the US and Canada reads your file and answers in writing, three to four business days after you finish the questions. $250 for cross-border, $195 for a second opinion on a filed return, and it comes straight off the bill if we do the work after. Or book a free 15-minute fit call first.

Start a Diagnostic →Book a free call

Get the next cross-border guide by email

One or two plain-English guides a week on US-Canada tax. No spam, unsubscribe anytime.

Cite this page

Yarik Yarosh, CPA. "Cost Segregation Studies for Small Business Commercial Property." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-cost-segregation-study-guide

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.