🇺🇸 Made in America·100% U.S.-Based Team · 24+ Years in Cost Segregation
A manufacturer named Marcus runs an aerospace machining shop in Phoenix. Last spring he commissioned a cost segregation study on the 42,000-square-foot facility he had purchased eighteen months earlier for $5.8 million. A few weeks into the analysis, the engineer brought him a question that mattered more than any other in the study.
There was a custom CNC machining center sitting in bay 4 of his facility. It had cost $480,000 to install three years before Marcus bought the building. It sat on a custom-poured 18-inch concrete pad. It was bolted to the pad with eight industrial anchors. It had dedicated three-phase electrical service running from a sub-panel mounted on the wall behind it. It had specialty ventilation ductwork connecting to a dedicated rooftop exhaust unit. The machine itself stood eleven feet tall and weighed 14,000 pounds.
The question: Was this machine part of the building, or was it tangible personal property?
The answer mattered. If the CNC center was classified as part of the building, its $480,000 cost would depreciate over 39 years. About $12,000 per year of deduction. If it was classified as personal property, the entire $480,000 could deduct in Year 1 under bonus depreciation. The difference between those two answers was roughly $173,000 in Marcus's first-year federal tax bill.
The framework that decides this question is called the Whiteco test. It comes from a 1975 Tax Court case that the IRS has accepted as the controlling legal standard for the last 50 years. Every properly built cost segregation study walks every disputed component through the Whiteco factors before classifying it. This article walks one real piece of equipment through those factors so you can see how the test actually works.
In 1975, a Tax Court judge was looking at a question that had been frustrating the IRS for years. A company called Whiteco Industries operated outdoor advertising displays. The company claimed those displays were tangible personal property for federal tax depreciation purposes. The IRS disagreed and said the displays were part of the underlying real property, depreciable over a much longer life.
The case went to trial. The judge needed a framework. Tax law had general principles about personal property versus real property, but no specific test had been laid out for items like advertising panels. The court reviewed the prior case law and synthesized six factors that, taken together, distinguished personal property from real property.
The taxpayer won. Whiteco Industries v. Commissioner, 65 T.C. 664 (1975), became precedent.
Half a century later, the IRS itself uses the Whiteco factors as the framework in its own Audit Technique Guide. Publication 5653, dated February 6, 2025, references the Whiteco factors as the controlling test for personal property determinations in cost segregation studies. The 347-page guide directs examiners to apply the Whiteco analysis to disputed components. The same six factors decide the outcome in the courtroom and in the audit room.
The six factors are:
Most cost segregation articles list these factors and leave the reader staring at six abstractions. The factors only make sense when you walk a real component through all six in sequence. Marcus's CNC machine is the example for the rest of this article.
The first factor asks whether the property is capable of being moved at all. Some items are not. A foundation poured into the earth cannot be moved without destroying it. A bearing wall cannot be removed without restructuring the building. These items fail factor 1 because they are not capable of being moved as a practical matter.
Marcus's CNC machine can be moved. The machine was manufactured at a plant in Kentucky, shipped to Phoenix on a flatbed truck, and installed at Marcus's facility. The same machine could theoretically be moved again. Industrial machine movers do this kind of work routinely. It would require rigging, a crane, a flatbed truck, and a few days of effort. But the machine is capable of being moved.
The second part of factor 1 asks whether the property has in fact been moved. This is where context matters. A machine that has been moved repeatedly across multiple locations leans heavily toward personal property. A machine that was installed once and is intended to stay leans the other way.
Marcus's CNC center was installed once and has not been moved. That weakens this factor slightly. But the controlling question under factor 1 is the capability of being moved, not the actual history. The machine passes factor 1. It is capable of being moved.
Factor 1 result for the CNC center: leans toward personal property.
The second factor looks at the design intent. Was the property built to be a permanent fixture of the location, or was it built to function as movable equipment that happens to be in this location?
A bearing wall is designed to be permanent. It is structural. It exists to hold up the building. Removing it would destroy the function of both the wall and the building. A bearing wall fails factor 2 because it was designed to remain permanently in place.
Marcus's CNC machine was designed to be machinery. The manufacturer builds industrial CNC centers as portable units that can be deployed to any qualified facility. The machine has its own internal structure, its own coolant system, its own enclosure. It functions as a complete unit independent of the building. The building exists to house it, not the other way around.
The custom electrical and ventilation that connect to the machine are arguments the IRS sometimes raises against factor 2. The argument is that custom infrastructure makes the equipment a permanent feature. The response, applied successfully in audit defenses for decades, is that custom infrastructure is common for industrial equipment of this size. Custom infrastructure does not change the design intent of the equipment itself. The CNC center was designed to be portable machinery. The custom infrastructure was designed to support whatever portable machinery occupied that bay.
Factor 2 result for the CNC center: passes. Designed to function as machinery, not as a building component.
The third factor asks about the expected or intended length of time the property will remain in its current location. Some property is intended to be permanent. Some is intended to be temporary. Some falls in between.
The framework looks at what a reasonable person would expect. A manufacturing facility owner who installs a CNC center expects to use that machine for its productive life. The manufacturer rates industrial CNC centers for 20-plus years of service. Marcus expects to use his machine for as long as it produces parts at acceptable quality, which is likely 15 to 20 years.
Long expected service life does not automatically fail factor 3. The question is whether the expected duration is consistent with the property being characterized as machinery or equipment, versus being characterized as a building component. A 20-year CNC center is consistent with industrial machinery. A 100-year service life would suggest building component characterization. The expected duration here is squarely in the range of personal property.
There is also the resale market consideration. Used industrial CNC centers trade actively on the secondary market. Marcus could sell his CNC center tomorrow to a buyer in another state. The machine would be uninstalled, transported, and reinstalled at a new location. This is fundamentally different from selling a structural wall or a roof system, which simply cannot be sold separately from the building they are part of.
Factor 3 result for the CNC center: passes. Intended length of affixation is consistent with machinery, not building components.
The fourth factor is about the effort and complexity of removing the property. Some property can be unplugged and carried out. Some property requires demolition. The substantiality of the removal effort is a factor in the analysis.
Removing Marcus's CNC center would take three to five days. The process: disconnect the dedicated electrical service, disconnect the coolant lines, disconnect the specialty ventilation ductwork, remove the eight industrial anchors holding it to the concrete pad, rig the machine with proper industrial lifting equipment, lower the machine onto rolling skids, move it out of the facility through the loading dock door it originally came through, and load it onto a flatbed truck. The team performing this work would consist of three or four industrial riggers using a forklift and a crane.
This is substantial work. It is more substantial than unplugging an office computer and walking out with it. It is also vastly less substantial than removing a structural element of a building. The IRS in its own 347-page Audit Technique Guide acknowledges that substantial removal effort does not, by itself, defeat personal property treatment. The question is whether the removal effort is consistent with industrial machinery or whether it is consistent with building components.
Building components do not get removed as a routine matter. They get demolished. The removal of a CNC center is not demolition. It is industrial relocation. Industrial relocation is a recognized commercial service performed for industrial machinery routinely.
Factor 4 result for the CNC center: passes, though with weight. The removal is substantial, but it is industrial-machinery substantial, not building-demolition substantial.
The fifth factor asks how much damage the property will sustain when it is removed. Some property sustains no damage at all (a computer pulled from a desk). Some property is destroyed by removal (a poured concrete foundation). The amount of damage is part of the analysis.
When Marcus's CNC center is uninstalled, the machine itself sustains essentially no damage. It is designed to be disconnected, moved, and reinstalled. Industrial riggers do this kind of work without harming the equipment. The CNC center could be relocated to a new facility, hooked up to new electrical and ventilation, and resume production within a few weeks.
Some collateral damage happens to the building. The eight anchors leave bolt holes in the concrete pad. The electrical conduit attached to the wall behind the machine would be disconnected at the sub-panel. The ventilation ductwork going to the roof would be capped or removed. The concrete pad itself stays. The walls stay. The roof stays.
The damage profile is consistent with personal property removal: the property survives intact, with minor collateral building damage that can be repaired in a day or two. This is fundamentally different from removing a structural component, which destroys both the component and a portion of the building.
Factor 5 result for the CNC center: passes. The property survives removal intact. The building damage is minor and repairable.
The sixth factor looks at how the property is attached to the land or the building. The forms of attachment range from no attachment at all (a free-standing piece of equipment on wheels) to permanent integration (a building's structural steel welded into the frame).
Marcus's CNC center is bolted to a concrete pad with eight industrial anchors. The bolts can be removed with hand tools. The electrical service is a hardwired connection at a junction box. The ventilation ductwork is connected with sheet metal fasteners. Each of these connections is designed to be reversible.
This is consistent with industrial machinery. Industrial CNC centers are attached substantially enough that they do not vibrate during operation, but they are attached using methods that can be reversed. The attachment is functional rather than permanent. The same eight anchors that hold the machine in place today can be unscrewed and removed tomorrow.
Contrast this with a structural beam in the building's roof system. That beam is welded into the structural frame. There are no removable bolts. The beam cannot be reversed out of the structure without cutting it apart. The manner of affixation is permanent and integral.
Factor 6 result for the CNC center: passes. The attachment is functional, reversible, and consistent with machinery rather than with building structure.
Marcus's CNC center passes all six Whiteco factors. It is capable of being moved (factor 1), designed as machinery rather than a building component (factor 2), intended for a length of affixation consistent with machinery (factor 3), removable through a substantial but recognized industrial process (factor 4), survives removal essentially intact (factor 5), and is attached using reversible methods (factor 6).
The CNC center is Section 1245 tangible personal property. Its $480,000 cost is reclassified out of the 39-year building schedule and into a shorter MACRS class with accelerated depreciation. Under the 100 percent bonus depreciation reinstated by the One Big Beautiful Bill Act on January 19, 2025, the entire $480,000 deducts in Year 1.
For Marcus at a 37 percent marginal federal bracket, that is roughly $177,600 in actual federal tax savings on this single component. The Whiteco analysis is what allows the deduction to be taken.
Not every component in Marcus's building passes Whiteco. The same engineering analysis that put the CNC center into Section 1245 left other items in Section 1250 because they failed one or more factors. Examples:
The structural steel frame of the building. Fails factors 1, 2, 4, 5, and 6. Cannot be moved, designed for permanent affixation, would require demolition to remove, would be destroyed in removal, welded to other structural members. Section 1250.
The poured concrete slab foundation. Fails every factor. Section 1250.
The general building electrical service from the utility meter to the main distribution panel. Designed and installed as a permanent building system. Cannot be relocated without rebuilding. Section 1250.
The roof system, the exterior walls, the interior partitions that separate fire-rated bays. All fail the Whiteco analysis. Section 1250.
A serious cost segregation study walks every disputed component through the six factors and reaches a defensible conclusion. The components that pass become Section 1245. The components that fail stay Section 1250. This is the analytical work the IRS Audit Technique Guide identifies as the difference between Approach 1 or Approach 2 studies (the IRS-preferred methodologies) and the weaker Approaches 3 through 6.
When the IRS examines a cost segregation study, the examiner is not looking at general category percentages. The examiner is looking at specific reclassified components and asking whether those components are properly Section 1245 personal property under the Whiteco analysis. A study that contains a written Whiteco analysis for every reclassified item closes on first examination. A study that lacks the analysis creates problems.
The Cost Seg America team applies the Whiteco analysis to every reclassified component on every study. The team has performed more than 16,000 of these studies over 24 years. The team has defended 125 IRS audits without a single loss. Every audit defense has cited Whiteco as the controlling framework, walked the disputed component through the six factors, and shown the IRS examiner the analysis on paper. Every audit defense has closed without adjustment. Engineered, not estimated. Made in America, by Americans.
If you own a commercial property and are evaluating a cost segregation study, the question to ask the firm is direct: will you apply the Whiteco 6-factor analysis to every reclassified component, in writing, and include that analysis in the report? A firm that hesitates is a firm whose study will not survive an IRS examination cleanly. A firm that answers yes without hesitation is a firm whose study will.
The Cost Seg America team has been performing engineered cost segregation studies that include written Whiteco analysis on every reclassified component for more than 24 years. 16,000 studies. 125 IRS audits defended. Zero losses. $0 ever returned to the IRS. The average first-year savings across the 16,000+ completed studies is $438,511. Every study uses IRS Approaches 1 and 2. Every study is engineered, not estimated. Unlimited audit defense is included on every study. No time limit. No hour cap. No additional fee. Ever.
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