Illustrative Asset Classification Review
A human review pass that challenges 5-year labels against Treas. Reg. §1.48-1 and the relevant IRS matrix. Educational information, not tax advice.
Educational information, not tax advice.
Updated 2026-10-14
Assumptions
- Educational information, not tax advice.
- Review is a proposed Super Intelligence stage and a professional duty. This illustration does not claim an agent finalizes classes without a person (F-18).
- Assume a draft restaurant schedule that over-labels restroom accessories as 5-year property.
- Changing a line to building is a successful review, not a failure.
Key takeaways
- Each 5-year line needs a function and a source: regulation, matrix row, or fact-specific case — not a creative label.
- The restaurant matrix lists restroom accessories as building. Decorative millwork can be 5-year in the same table. Inspection still controls.
- Treas. Reg. §1.48-1 defines tangible personal property, buildings, and structural components. Matrices are examiner guidance, not statutes.
- Courts split on similar assets. Present outcomes as fact-specific. Do not say an asset “is” 5-year property in every building (F-10).
A draft schedule marks restroom accessories as 5-year property in a restaurant. The reviewer opens the restaurant matrix, which lists those items as building, and moves them. Decorative millwork stays 5-year, matching the same matrix, after inspection confirms it is decorative rather than a structural wall.
That is the intended quality step: compare each label with the regulation and with examiner guidance, then keep an audit trail of changes. Educational information, not tax advice.
Order of operations for review is not a second takeoff. It is a challenge pass: Does every short-life line cite authority? Does the nomenclature match CSI rather than marketing names? Was HVAC allocated despite matrix language that allocation is not appropriate? Were partitions treated as movable without Whiteco facts? Did anyone read a written purchase allocation? Does the total still equal basis after lines move?
Not operational automation
This illustration describes a review workflow. It does not claim an agent finalizes classes without a person. CostSeg SI’s classification and QA stages are proposed Super Intelligence product descriptions. No source supports an accuracy or time-saving claim. Engineer certification is not claimed as operational staffing on this website (F-17, F-18). The ATG states the IRS has not established preparer qualifications or a standard report format. Do not call the reviewed schedule “IRS-approved.”
A person still opens the regulation. If a model tagged every chrome accessory as 5-year because the word “accessory” appeared, the reviewer puts those lines back with the restrooms.
The legal tests on the desk
Treas. Reg. §1.48-1(c) and (e) distinguish tangible personal property from buildings and structural components. Structural components include walls, partitions, floors, ceilings, windows, doors, central HVAC, plumbing and fixtures, wiring and lighting fixtures, stairs, elevators, sprinklers, and similar items. Local law is not controlling. Machinery whose sole justification is process temperature or humidity can be excepted. HCA held that these investment-credit definitions still determine §1245 versus §1250 status under MACRS; the IRS agreed with the test, not every item.
Whiteco’s six factors test inherent permanence. Scott Paper supports electrical functional allocation with load evidence. AmeriSouth cautions against exploding residential buildings. Metro National is one memorandum on partitions. None of those cases is a rubber stamp for a restroom paper-towel dispenser.
Matrix rows as maps
If the property is a restaurant, open the restaurant matrix. Restroom accessories, partitions, and fireplaces are building. Decorative millwork can be 5-year. Carpeting is treated as not permanent. Dedicated kitchen hook-ups follow equipment. Central HVAC is building. If the property is retail, grocery, residential, casino/hotel, auto dealership, auto manufacturing, or pharmaceutical, open that chapter instead. Each matrix warns it may not apply outside its industry. If a return follows a matrix, examiners are directed not to adjust that categorization and life — which is a reason to follow the row, not a reason to stretch it.
Where there is no matrix (office, warehouse, self-storage, medical office), say so and reason from the regulation and analogous facts. Do not import a restaurant millwork row into a warehouse office.
Nomenclature and audit trail
The ATG lists use of a common nomenclature and a standard numbering system among quality elements, and it warns against creative labels such as sewage piping called process piping. “Feature lighting” that is the only light in the corridor is general lighting. “Process piping” that serves restrooms is plumbing. Changing the name does not change the class.
Keep an audit trail: original label, cited authority, revised label, reviewer initials or equivalent. Changing a line to building is a successful review. A file with no changes is not proof of quality; it can mean no one looked.
After the pass
Re-total the classes. If restroom accessories moved back to 39-year property, depreciable basis must still add up. The CPA files Form 4562 from the reviewed schedule, not from the draft. If this is a look-back, the reviewed classes feed Form 3115. Bonus percentages stay off the class label: a 5-year millwork line acquired after January 19, 2025 is not “100% property”; it is 5-year property that may be bonus-eligible as of Notice 2026-11. Educational information, not tax advice.
If a written purchase allocation is in the file, stop the review long enough to read it. Peco Foods is a risk when a §1060 writing exists; it is not a rule that every restaurant closing is locked. QA and classification review cannot invent a different split after the fact.
Sources
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- 2IRS 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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