A $2,000,000 commercial property typically generates $300,000–$600,000 in accelerated first-year depreciation — producing $100,000–$200,000 in immediate tax savings at a 35–37% federal rate.
What Is a Cost Segregation Study?
A cost segregation study is an IRS-approved engineering analysis that reclassifies components of a commercial building from the standard 39-year depreciation schedule to accelerated 5-year, 7-year, or 15-year schedules, allowing property owners to front-load depreciation deductions and significantly reduce taxable income in the early years of ownership. When combined with bonus depreciation provisions that allow immediate expensing of eligible components, a single cost segregation study can produce a current-year deduction equal to 20–40% of a property’s total cost basis.
How Cost Segregation Works
Under standard tax accounting, the entire cost basis of a commercial building is depreciated over 39 years. A cost segregation study identifies components — flooring, lighting, specialized electrical systems, plumbing fixtures, land improvements — that qualify for 5-, 7-, or 15-year depreciation under MACRS. These components are reclassified on the tax return, dramatically accelerating the deduction timeline.
Under current bonus depreciation rules, qualifying 5-year and 15-year property can be expensed immediately in the year placed in service — converting what would be a multi-year deduction stream into a single, large current-year deduction.
Typical Results by Property Type
| Property Type | Reclassification Rate | Example Value | Est. Year-One Deduction |
|---|---|---|---|
| Office building | 20–30% | $2,000,000 | $400,000–$600,000 |
| Retail / restaurant | 25–40% | $1,500,000 | $375,000–$600,000 |
| Industrial / warehouse | 15–25% | $3,000,000 | $450,000–$750,000 |
| Mixed-use | 20–35% | $2,500,000 | $500,000–$875,000 |
Lookback Studies: Capturing Missed Deductions
A cost segregation lookback study allows property owners to capture all accelerated depreciation they would have taken on a property since its acquisition — even if owned for years without a study. Under IRS Rev. Proc. 2002-9, owners can file a change in accounting method (Form 3115) to claim all previously missed accelerated depreciation in a single year, without amending prior returns.
A business owner who purchased a commercial building in 2018 and never conducted a study can capture six or more years of accelerated deductions in the current tax year.
Passive Activity Rules and Real Estate Professional Status
The passive activity loss rules under IRC Section 469 generally limit deductibility of rental real estate losses against ordinary income. Taxpayers who qualify as real estate professionals — meeting specific hour thresholds and material participation standards — can deduct rental losses against ordinary income without limitation. For a qualifying real estate professional, cost segregation deductions are fully available against W-2 income and other ordinary income sources.
Frequently Asked Questions
What types of property qualify?
Any commercial or investment real property — office buildings, retail space, warehouses, restaurants, hotels, and residential rental properties with 5+ units — qualifies. Most impactful for properties with a cost basis of $500,000 or more.
How much does a cost segregation study cost?
Study fees typically range from $5,000–$15,000. For a $2M property generating $400,000 in first-year deductions at a 37% marginal rate, the study cost is recovered many times over in year one.
Does cost segregation trigger an audit?
No, when properly documented. Cost segregation is a well-established, IRS-recognized strategy. The study must be prepared by a qualified engineering firm and the asset classifications properly supported.
What happens to depreciation recapture when I sell?
Accelerated depreciation is subject to recapture at a maximum 25% rate when the property is sold. POM Unlimited models the long-term impact when evaluating whether cost segregation makes sense for each property, taking into account expected hold period and likely exit strategy.
Can I apply cost segregation to properties I already own?
Yes. A lookback study captures missed deductions via Form 3115, filed with the current-year return — no amended returns required.
Schedule a Strategy Call
If you own commercial or investment real property and have not conducted a cost segregation study, schedule a call to see what a study on your portfolio would produce.