The Docket · Guide · Working level
How cost segregation became law: the cases behind the studies
Cost segregation rests on five decades of case law — from investment tax credit component disputes through Whiteco's permanency factors to Hospital Corp of America and the modern boundary cases. Here is the doctrinal lineage every study relies on.
Cost segregation is not a loophole invented by consultants; it is the application of a component-classification doctrine that federal courts built over fifty years, mostly in disputes about the investment tax credit. The controlling modern authority is Hospital Corp of America v. Commissioner, 109 T.C. 21 (1997), which held that the old ITC distinction between a building's structural components and its Section 1245 tangible personal property survives into MACRS — so a hospital's branch electrical wiring, kitchen plumbing, and similar items could be depreciated over short recovery periods instead of the building's long one. The IRS acquiesced in that result in 1999 and responded not by fighting the doctrine but by regulating its practice, publishing the Cost Segregation Audit Techniques Guide that still frames every examination today.
This guide traces the doctrinal line: the ITC-era component cases, Whiteco's six-factor permanency test, the ACRS interregnum, Hospital Corp of America's revival, and the modern boundary cases — AmeriSouth, Peco Foods, Boddie-Noell — that mark where the doctrine stops.
Where the doctrine started: the investment tax credit
From 1962 until its general repeal in 1986, the investment tax credit under old Section 38 rewarded investment in "section 38 property" — essentially tangible personal property and certain other tangible property, but pointedly not buildings or their structural components. That exclusion created an enormous incentive to argue that particular assets attached to a building were not structural components at all, and a body of litigation grew up around the line.
Congress and Treasury supplied the raw definitions. Section 1245 (see the Internal Revenue Code) defines the recapture class of "personal property," and the regulations under old Section 48 — notably Treas. Reg. §1.48-1(c) and (e) — distinguish tangible personal property from "structural components" such as walls, floors, permanent coverings, central HVAC, and general building wiring and plumbing. The courts spent two decades applying those definitions to awkward facts: gasoline station canopies, bank vault doors, ornamental fixtures, restaurant décor, mobile home parks.
Two analytical strands emerged:
- Permanency: is the asset so affixed that it is, in substance, part of the building? This is the Whiteco line.
- Function: does the asset serve the building's general operation (structural) or the specific business conducted inside it (personal property)? This is the strand running through Scott Paper and the "accessory to a business" cases such as Boddie-Noell.
Whiteco's six questions
Whiteco Industries, Inc. v. Commissioner, 65 T.C. 664 (1975), involved outdoor advertising signs set on poles embedded in the ground. The government said they were inherently permanent structures; the taxpayer said they were tangible personal property eligible for the credit. Surveying its own precedents, the Tax Court distilled six questions:
- Can the property be moved, and has it been moved?
- Is it designed or constructed to remain permanently in place?
- Are there circumstances that tend to show the expected or intended length of affixation — that is, may the property have to be moved?
- How substantial and time-consuming a job is removal?
- How much damage will the property sustain on removal?
- What is the manner of affixation?
The signs won: they were moved in practice, designed for relocation as leases and highways changed, and removable without destroying them. No single factor controls; the inquiry is a practical judgment about permanence in fact rather than attachment in form. The Whiteco factors remain the standard permanency test cited in the Cost Segregation Audit Techniques Guide and in every serious study. Our full brief: Whiteco Industries v. Commissioner.
The ACRS interregnum
The Economic Recovery Tax Act of 1981 replaced facts-and-circumstances useful lives with the Accelerated Cost Recovery System, and the Tax Reform Act of 1986 both repealed the general ITC and stretched real property recovery to what became 39 years for nonresidential buildings under MACRS. For a decade it was widely assumed that component depreciation was dead: Congress had explicitly ended the practice of depreciating a single building's components over separate lives, and without the ITC the old case law seemed orphaned.
That assumption conflated two different things — depreciating the structural building in pieces (genuinely prohibited) versus classifying assets that were never structural components in the first place. The distinction is the entire modern industry.
Hospital Corp of America: the revival
In Hospital Corp of America v. Commissioner, 109 T.C. 21 (1997), the taxpayer claimed short recovery periods for hundreds of hospital asset categories — branch wiring serving medical equipment, kitchen plumbing and steam lines, carpeting, accordion partitions, and more. The Commissioner argued the 1981 and 1986 Acts had foreclosed any component analysis.
The Tax Court disagreed. Whether property is a structural component or Section 1245 personal property is a classification question that precedes the recovery-period question, and the ITC-era tests — including Whiteco — remain the tools for answering it. Item by item, the court held that electrical distribution allocable to specific equipment, plumbing dedicated to kitchen fixtures, and similar assets were personal property; primary building systems remained structural. In 1999 the IRS acquiesced in the result (AOD 1999-008), and cost segregation became an accepted — if scrutinized — practice, with mechanics governed by MACRS and Pub 946, and retroactive studies implemented as accounting method changes on Form 3115. Full brief: Hospital Corp of America v. Commissioner.
The modern boundary cases
Post-1997 litigation has mostly gone the government's way, and the losses are as instructive as the foundational wins.
AmeriSouth XXXII, Ltd. v. Commissioner, T.C. Memo 2012-67, is the government's counterattack playbook. A partnership commissioned a study reclassifying roughly $3.4 million of a garden apartment complex — site utilities, special plumbing, kitchen electrical, finish carpentry — into 5- and 15-year classes. The Tax Court walked through the components and sustained the Commissioner on nearly all of them, treating apartment sinks, cabinets, wiring, and water distribution as structural parts of a residential rental building. Worse, AmeriSouth stopped responding to the court mid-case, so factual assertions were deemed conceded. Full brief: AmeriSouth XXXII v. Commissioner.
Peco Foods, Inc. v. Commissioner, T.C. Memo 2012-18, aff'd, 522 F. App'x 840 (8th Cir. 2013), marks a contractual boundary rather than an engineering one. Peco bought two poultry plants under purchase agreements that allocated price among agreed asset categories, then later commissioned studies subdividing those categories. Under the Danielson rule and Section 1060, the court held the taxpayer bound by its own written allocations. You cannot cost-seg your way out of your contract. Full brief: Peco Foods v. Commissioner.
Boddie-Noell Enterprises, Inc. v. United States, 36 Fed. Cl. 722 (1996), aff'd, 132 F.3d 54 (Fed. Cir. 1997), an ITC-era case about Hardee's restaurants, sorted dozens of restaurant items — signage, decor, kitchen systems, site improvements — asking which were accessories to the food-service business rather than parts of the building. It remains the touchstone for restaurant and retail studies. Full brief: Boddie-Noell v. United States.
Alongside these sits Scott Paper Co. v. Commissioner, 74 T.C. 137 (1980), the leading authority on allocating dual-use utility systems by primary use and function — the doctrinal basis for allocating electrical load between equipment and building service. Full brief: Scott Paper v. Commissioner.
Doctrine table: factor tests to study positions
The table below maps each doctrinal test to the modern study position it supports and the case that anchors it.
| Doctrine | Anchor case | Question it answers | Modern study position |
|---|---|---|---|
| Six-factor permanency test | Whiteco, 65 T.C. 664 (1975) | Is the asset inherently permanent? | Signs, partitions, equipment foundations, certain site assets as 1245 property |
| Component classification under MACRS | Hospital Corp of America, 109 T.C. 21 (1997) | Do ITC-era tests survive ACRS/MACRS? | The entire premise of a cost segregation study |
| Primary use / functionality | Scott Paper, 74 T.C. 137 (1980) | Whom does a dual-use system serve? | Load-study allocation of electrical, plumbing, HVAC between equipment and building |
| Accessory to the business | Boddie-Noell, 36 Fed. Cl. 722 (1996) | Does the asset serve the business or the building? | Restaurant/retail décor, kitchen systems, trade fixtures |
| Structural-component limits | AmeriSouth, T.C. Memo 2012-67 | Where does reclassification overreach? | Caution on residential components; expect item-by-item IRS scrutiny |
| Contractual allocation binds | Peco Foods, T.C. Memo 2012-18 | Can a study override a §1060 agreement? | No — check the purchase agreement before scoping any acquisition study |
| Estimation doctrine | Cohan, 39 F.2d 540 (2d Cir. 1930) | Can courts estimate undocumented amounts? | A weak backstop only; no substitute for engineering documentation |
What the winning and losing cases have in common
The pattern across the docket is consistent. Taxpayers win where the asset's classification is supported by specific engineering facts tied to a recognized factor test: which circuits serve which machines, which drains serve which fixtures, how an asset is affixed and whether it has actually been moved. Taxpayers lose where the position is generic (a percentage lifted from another building type), where it contradicts their own documents (Peco Foods), where the property type itself resists reclassification (residential rentals in AmeriSouth), or where the record is simply thin — and Cohan v. Commissioner, 39 F.2d 540 (2d Cir. 1930), for all its fame, allows only grudging estimates that bear heavily against the careless. See our brief on Cohan v. Commissioner and the practice guidance in audit readiness and documentation.
Why the lineage matters now
With 100% bonus depreciation permanently restored for qualified property acquired after January 19, 2025, the stakes of classification are higher than at any point since 1986: an asset moved from 39-year to 5- or 15-year property is typically deductible in full in year one. That makes the classification case law — not the depreciation tables — the real battleground. A study is only as strong as its mapping from asset facts to Whiteco, Scott Paper, and Hospital Corp of America, and only as safe as its consistency with the taxpayer's own acquisition documents.
For the mechanics of how a study translates this doctrine into recovery periods, start with what a cost segregation study is and our walkthrough of the Cost Segregation Audit Techniques Guide.
Frequently asked questions
- What is the legal basis for cost segregation?
- Cost segregation rests on Hospital Corp of America v. Commissioner, 109 T.C. 21 (1997), in which the Tax Court held that the component-classification principles developed under the investment tax credit still apply for MACRS depreciation. Property that qualifies as Section 1245 tangible personal property may be depreciated over 5 or 7 years rather than the 39-year period for nonresidential real property, and the IRS acquiesced in the result in 1999.
- What are the Whiteco factors?
- In Whiteco Industries v. Commissioner, 65 T.C. 664 (1975), the Tax Court posed six questions to decide whether an asset is a permanent structural improvement or movable tangible personal property: can it be moved and has it been; is it designed to remain in place; are there circumstances showing it may have to be moved; is removal substantial and time-consuming; is it readily movable; and how much damage would removal cause.
- Can the IRS challenge a cost segregation study?
- Yes. The IRS routinely examines cost segregation studies under its Cost Segregation Audit Techniques Guide, and cases such as AmeriSouth XXXII v. Commissioner, T.C. Memo 2012-67, show the government reclassifying most contested apartment components back to 27.5-year structural property. Studies with weak engineering support, generic allocations, or positions that contradict the taxpayer's own purchase documents are the most vulnerable.
- Does a purchase agreement allocation override a cost segregation study?
- Generally yes. In Peco Foods v. Commissioner, T.C. Memo 2012-18, affirmed by the Eighth Circuit, the Tax Court held that allocations agreed to in an asset purchase agreement under Section 1060 bind the taxpayer under the Danielson rule. A later cost segregation study could not subdivide asset categories the contract had already fixed.
- Does the Cohan rule let taxpayers estimate cost segregation allocations?
- Only weakly. Cohan v. Commissioner, 39 F.2d 540 (2d Cir. 1930), lets courts estimate deductions when some expenditure is proven but records are imperfect — yet the court may bear heavily against the taxpayer whose inexactitude is of their own making. Modern courts expect engineering-based support for asset classifications, and Cohan cannot substitute for a documented study.