Personal Property vs. Real Property
The line between tangible personal property (§1245) and real property (§1250) decides most cost segregation outcomes. Treasury Regulation §1.48-1 and the cases that apply it draw that line. Local fixture law does not. Permanence and function are tested together, item by item.
Educational information, not tax advice.
Updated 2026-10-14
Key takeaways
- Buildings and their structural components are real property; property contained in a building can still be personal property.
- Local-law fixture rules do not decide the federal tax question.
- Courts use the Whiteco factors to test whether an item is inherently permanent.
- Hospital Corporation of America held that the former investment-credit definitions still apply under MACRS.
- Function — whether an item serves equipment or the building — matters along with permanence.
Treasury Regulation §1.48-1 defines tangible personal property as any tangible property except land and improvements to land, such as buildings and other inherently permanent structures, including their structural components. It lists examples that are personal property even when inside or attached to a building: production machinery, refrigerators, grocery counters, display racks and shelves, and signs.
Structural components are listed too: walls, partitions, floors, ceilings and permanent coverings, windows and doors, central heating and air-conditioning, plumbing and plumbing fixtures, electric wiring and lighting fixtures, stairs, elevators, sprinkler systems, and other components relating to the operation or maintenance of the building.
Those definitions were written for the former investment tax credit. They still decide the §1245 versus §1250 line under MACRS. Personal property identified in a study is generally §1245 property. The building and its structural components are generally §1250 property.
The same physical object can land on either side of the line depending on how it is attached, how long it is expected to stay, and what it serves. A removable display case is a regulation example of personal property. A partition that divides rooms and relates to the operation of the building is listed as a structural component.
Do not treat an asset class as automatic for every building. Courts have reached different results on similar items when the facts differed. Educational information, not tax advice.
Why rules from an old credit still apply
These definitions were written for the former investment tax credit. In Hospital Corporation of America v. Commissioner (1997), the Tax Court held that the same tests still decide whether an item is §1245 or §1250 property under MACRS. The IRS acquiesced in that legal test, though not in every item-level result.
Action on Decision 1999-008 records that acquiescence. It accepts the legal framework and leaves room to dispute particular items on their facts. Citing HCA for the test is different from treating every hospital fixture in that opinion as 5-year property in another building.
Rev. Proc. 87-56 class 00.3 also points back to §1.48-1(e) when it excludes buildings and structural components from land improvements. The old regulation is the classification vocabulary MACRS still uses.
The permanence test
Whiteco Industries v. Commissioner (1975) asked six questions: can the item be moved and has it been; is it designed to stay in place; how long is it expected to stay; how hard is it to remove; how much damage does removal cause; and how is it attached. No single factor controls.
An item that is bolted down is not automatically a structural component. An item that can be lifted is not automatically personal property. The factors are weighed together against the regulation’s list and the item’s function.
AmeriSouth XXXII, Ltd. v. Commissioner later applied related tests to an apartment complex and kept most contested items with the 27.5-year buildings. That result is fact-specific to those apartments. It is not a rule that residential finishes can never be personal property.
Function matters too
Items that serve equipment or the business, rather than the building, can be personal property. Electrical wiring and plumbing dedicated to specific equipment are common examples, while general building wiring and restroom plumbing stay with the building. Courts have often decided these questions item by item.
Scott Paper and later electrical cases discuss allocating primary and secondary electrical distribution by design load. The IRS audit guide treats that functional allocation as accepted for electrical distribution. It does not extend the same method to plumbing or HVAC as an IRS-accepted approach.
Lighting follows a similar function question: is the fixture the room’s primary light source, or is it decorative or merchandise lighting? Primary building lighting stays with the structure in the regulation’s list. Decorative or process lighting is analyzed on the facts.
What the regulation’s lists do not settle
The examples in §1.48-1 are illustrations, not an inventory of every store or apartment. Grocery counters and display racks are personal property in the regulation. Kitchen cabinets in a residential rental are treated as building in the IRS residential matrix. Those are different facts, not a contradiction in the definition.
Industry matrices in Publication 5653 show how examiners have applied the tests in a few businesses. Each matrix warns that it reflects that industry’s general pattern and may not apply elsewhere. Copying a restaurant row into an office is a common error.
Why the line matters on sale
Depreciation on §1245 property is generally recaptured as ordinary income to the extent of depreciation previously taken. Section 1250 recapture is generally limited to additional depreciation above straight line.
A study that moves cost into §1245 classes therefore changes both the timing of deductions and the character of gain if the property is sold. That trade-off belongs in the conversation with your CPA before the return is filed.
Sources
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- 5IRS Publication 5653 — Cost Segregation Audit Techniques Guide (rev. 2-2025)(opens in a new tab)
Written for IRS examiners. The guide states it is not an official pronouncement of law and cannot be cited as authority. It predates the July 2025 law.
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