Every dollar a cost segregation study reclassifies rests on one distinction: §1245 property or §1250 property. It sets the recovery period, sets bonus eligibility, and at disposition decides whether your client's gain is ordinary income at rates up to 37% or unrecaptured §1250 gain capped at 25%.
The short answer
- §1245 property is depreciable tangible personal property, plus certain property used as an integral part of manufacturing. In practice, what a study reclassifies into 5-, 7-, and 15-year lives.
- §1250 property is depreciable real property that is not §1245 property: the 27.5- or 39-year shell and its structural components.
- Recapture diverges sharply. §1245 gain up to depreciation taken is fully ordinary. §1250 produces unrecaptured gain at a 25% maximum.
- Two frameworks decide close cases: the Whiteco Industries six-factor permanence analysis, and the Hospital Corporation of America line between assets serving the building and assets serving the business inside it.
- Land improvements sit between the categories, and their recapture treatment requires asset-by-asset care.
The Two Definitions, Stated Cleanly
Start with the negative definition, because that is how the statute is built: §1250 property is depreciable real property that is not §1245 property. The two are defined against each other, so classification reduces to one question: is this §1245 property?
Inside a building, §1245 items behave like equipment or furnishing rather than structure. Carpet and removable flooring, cabinetry and millwork, decorative lighting, appliances, window treatments, security and communication equipment, dedicated circuits, and some specialty plumbing land there at 5-year lives. Certain furniture and fixtures fall at 7 years. Land improvements, paving, curbs, site utilities, fencing, landscaping, site lighting, drainage, carry 15-year lives under 150% declining balance.
What remains, foundation, framing, roof, exterior walls, general HVAC and plumbing and electrical service, permanent partitions, is §1250 property on 27.5 years for residential rental and 39 years for nonresidential. See the 5-, 7-, and 15-year property examples.
Why the Distinction Decides the Client's Tax Bill
Classification drives two outcomes. Up front, a shorter recovery period accelerates the deduction and, at 20 years or less, opens 100% bonus depreciation under §168(k), permanent after OBBBA for property acquired and placed in service after January 19, 2025. At the back end it changes the rate. Here is one building disposed of in year six, both ways.
Example: nonresidential property, $2,500,000 basis, placed in service in January, sold in year 6 With a study, $600,000 is §1245 property and fully deducted in year one under bonus, leaving $1,900,000 on 39-year straight line. Without a study, all $2,500,000 sits on 39-year straight line. The structure line uses the MACRS mid-month convention: 2.461% in year one, 2.564% thereafter, or 15.281% cumulative over six years.
| With study | Without study | |
|---|---|---|
| Depreciation taken, §1245 assets | $600,000 | $0 |
| Depreciation taken, §1250 structure (6 yrs) | $290,339 | $382,025 |
| Total depreciation taken | $890,339 | $382,025 |
| Ordinary recapture at 37% | $222,000 | $0 |
| Unrecaptured §1250 gain at 25% | $72,585 | $95,506 |
| Tax on the depreciation slice at sale | $294,585 | $95,506 |
The study produced $508,314 more depreciation over the hold and cost $199,079 more at exit, before discounting. Whether that trade wins is a present-value question, worked through in depreciation recapture after cost segregation. The point here is narrower: the difference is entirely classification. The 37% line is an upper bound, since land improvements inside that $600,000 do not all recapture as flat ordinary income.
The Whiteco Six-Factor Permanence Test
Whiteco Industries v. Commissioner, 65 T.C. 664 (1975), supplies the framework for whether an item is inherently permanent, and so structural, or tangible personal property. Six questions, none dispositive alone:
- Can the property be moved, and has it in fact been moved?
- Is it designed or constructed to remain permanently in place?
- Are there circumstances showing it may or will have to be moved?
- How substantial and time consuming is removal?
- How much damage will the property sustain on removal?
- How is it affixed to the land or building?
Read together, the factors describe intent evidenced by construction. An item bolted down for stability but routinely relocated at turnover reads as personal property; one embedded in a slab and destroyed by removal does not. Attachment is not permanence.
The HCA Question: Building or Business?
Hospital Corporation of America v. Commissioner, 109 T.C. 21 (1997), validated component-based segregation post-ACRS and supplied the question that resolves most modern disputes: does the asset relate to the operation and maintenance of the building, or to the business conducted inside it?
General illumination, service electrical, and HVAC conditioning occupied space serve the building. Wiring to a specific machine, plumbing dedicated to a process, and finishes installed for a particular use serve the business. The same item can fall either way depending on what it feeds, which is why classification requires knowing what the tenant does, not only what the drawings show.
Four Disputed Items, Resolved
| Item | Analysis | Typical result |
|---|---|---|
| Decorative and accent lighting | Serves the business and the interior scheme, not general illumination. Removable without structural damage. | §1245, 5-year. General illumination stays §1250. |
| Primary electrical switchgear | Serves both building loads and specific equipment. The 2025 ATG says to allocate on electrical load. | Split. Load serving §1245 equipment follows that equipment. |
| Cabinetry and millwork | Screwed to blocking, removable in sections, replaced on turnover. Whiteco factors 1, 4, and 5 all point one way. | §1245, 5-year, where it is not structural casework. |
| Specialty plumbing | Rough-in serving a process sink, equipment drain, or dedicated fixture relates to the business. Supply and waste lines relate to the building. | §1245 for the dedicated portion only. |
The switchgear line is worth dwelling on. The February 2025 revision of Publication 5653 added guidance on load-based allocation, along with §179D interaction and the treatment of stand-alone open-air parking structures as 39-year property. An examiner working from the current guide expects a load calculation, not a percentage. See our walkthrough of the ATG.
The Honest Part: Land Improvements Sit Between the Categories
Fifteen-year land improvements are the untidy corner of this analysis, and clients should hear it from you first. Depreciated under 150% declining balance, they generate more depreciation than straight line would have. That excess carries §1245-style recapture while the balance behaves differently. A parking lot recaptures like neither a dishwasher nor a roof, and treatment depends on the asset and how it was depreciated.
Two practical consequences. Do not model an exit by lumping all reclassified property into one ordinary-recapture bucket; land improvements need their own line. And keep the asset detail schedule alive in the fixed asset system for the whole hold, because the disposition computation is only as good as that schedule. See MACRS depreciation explained.
Frequently Asked Questions
Does §1245 classification depend on whether the item is bolted down?
Attachment is one of six Whiteco factors, not the test. An item can be firmly affixed and still be personal property if it is designed to be moved, is moved in practice, and survives removal without significant damage. Weigh the factors together.
How does bonus depreciation interact with classification?
Bonus eligibility follows the recovery period, not the section label. Property with a MACRS recovery period of 20 years or less qualifies, which captures 5-, 7-, and 15-year property plus QIP. A correct §1245 classification is usually what unlocks the 100% first-year deduction.
Is qualified improvement property §1245 or §1250?
QIP is §1250 property: interior improvement to a nonresidential building placed in service after the building was, excluding enlargement, elevators and escalators, and internal structural framework. It carries a 15-year straight-line life and is bonus-eligible, so it behaves like short-life property while remaining real property for recapture.
What documentation supports a §1245 classification under exam?
Asset-level listing, unit costs and asset groupings, the engineering rationale for each allocation, and a reconciliation of allocated cost to actual cost. Those sit among the ATG's 13 elements. A classification asserted without a takeoff is a conclusion, not evidence. Our cost segregation guide for CPAs covers what to request.
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This article is provided by Precision Cost Segregation for general educational purposes and does not constitute tax, legal, or accounting advice. Tax outcomes depend on your specific facts, your tax rate, your passive activity position, and your entity structure. Figures shown are illustrative. Consult your CPA or tax advisor before acting, and engage a qualified professional to perform any cost segregation study. Information is current as of publication.
This article is general information, not tax or legal advice. Depreciation outcomes depend on your facts, elections, and current law — consult your CPA before acting. © 2026 Precision Cost Segregation.