Carpet is 5-year. Sidewalks are 15-year. The electrical panel could be either 5-year or 39-year, and the honest answer is that it depends on what the panel feeds. That third case is the one that matters. Classification is not a lookup exercise; it is a legal test applied to a physical asset, and the reasoning is what survives examination.
Key takeaways
- 5-year property is §1245 tangible personal property: assets serving the business conducted in the building, not the building itself.
- 7-year property is narrow, covering certain office furniture, fixtures, and equipment.
- 15-year land improvements are site work outside the building envelope: paving, utilities, landscaping, fencing, site lighting.
- The dividing line comes from Whiteco's permanence test and from Hospital Corporation of America, which asks whether an asset serves the operation of the building or the business inside it.
- The reasoning matters more than the conclusion. Two engineers can disagree on the same panel; only one can defend the answer.
What Lands in the 5-Year Bucket, and Why
Five-year property is the heart of a study: §1245 assets on the 200% declining balance method, and bonus-eligible.
| Asset | Why it qualifies |
|---|---|
| Carpeting and removable flooring | Adhesive or tack-strip attachment; replaced on a business cycle |
| Decorative lighting | Serves ambiance and branding, not general illumination |
| Dedicated electrical to equipment | Powers a specific machine, not the general load |
| Cabinetry and millwork | Serves the occupant's business; removable without damage |
| Appliances | Freestanding or slide-in; no permanence characteristics |
| Window treatments | Blinds, shades, hardware; trade fixtures under Whiteco |
| Security and communication equipment | Cameras, access control, data cabling |
| Specialty plumbing | Lines serving process equipment, not the building |
The common thread is function. If the asset exists because of the business conducted in the space, it points to §1245. If it exists because a building needs it to be a building, it points to §1250.
Why the 7-Year Bucket Is Narrower Than People Expect
Seven-year property appears far less often than the "5, 7, and 15" shorthand implies. Most of what a client calls "furniture" is already on the books or was never in the purchase price.
| Asset | Why it qualifies |
|---|---|
| Certain office furniture and fixtures | Class assignment for office FF&E not otherwise classified |
| Certain business equipment | Class assignments vary by asset and by the activity served |
Assignments turn on the specific asset and the taxpayer's activity. A "7-year" label applied by default rather than by analysis is a soft spot in a report.
15-Year Land Improvements: Everything Outside the Envelope
Land improvements recover over 15 years on the 150% declining balance method. They are also the most commonly missed category on self-prepared schedules, because owners lump site costs into land or building.
| Asset | Why it qualifies |
|---|---|
| Paving, sidewalks, and curbs | Land improvements with a determinable useful life |
| Site utilities | Distribution outside the building footprint |
| Landscaping | Plantings adjacent to and affected by the building |
| Fencing and gates | Site improvements, not building components |
| Site lighting | Pole-mounted exterior lighting and underground feeds |
| Retaining walls and drainage | Permanent, but improvements to land |
| Signage (site-mounted) | Monument and pylon signage serving the site |
Note the distinction that trips people: land improvements are not land. Land is never depreciable. Everything above is.
The Legal Test Behind Every Close Call
Two authorities do the real work.
Whiteco Industries v. Commissioner, 65 T.C. 664 (1975), supplies the six-factor permanence analysis for whether something is an inherently permanent structure. The factors: can the asset be moved, and has it been moved; was it designed to stay in place; do circumstances show an intended length of affixation; how substantial is removal; how much damage does removal cause; and how is it affixed. Movability plus non-destructive removal is the strongest combination for §1245.
Hospital Corporation of America v. Commissioner, 109 T.C. 21 (1997), adds the second question: does the asset relate to the operation or maintenance of the building, or serve the business inside? A restroom exhaust fan relates to the building. A paint-booth exhaust relates to the business. Same category, opposite answers. See §1245 versus §1250 property.
Three hard cases show the framework working.
The electrical panel. A subpanel wired exclusively to kitchen equipment is 5-year. A main distribution panel is not automatically 39-year: the current IRS Audit Techniques Guide directs that primary switchgear be allocated based on electrical load. Where 45% of connected load serves §1245 equipment, a corresponding share follows.
The parking lot. Surface paving, striping, curbs, and lot lighting are 15-year land improvements. A stand-alone open-air parking structure is 39-year property under the current ATG.
Interior renovation. Interior work placed in service after the nonresidential building was, and outside the three statutory exclusions, is qualified improvement property at 15 years straight-line, not 5-year.
A Worked Allocation: A $3.6M Retail Strip Center
Example: a $3.6M retail strip center Purchase price $3,600,000. Land allocated at $600,000, leaving $3,000,000 of depreciable basis.
| Class | Basis | Share | Representative assets |
|---|---|---|---|
| 5-year §1245 | $360,000 | 12% | Tenant lighting, dedicated power, millwork, cabling |
| 7-year | $30,000 | 1% | Common-area furniture and fixtures |
| 15-year land improvements | $420,000 | 14% | Paving, curbs, site lighting, landscaping, sign |
| 39-year structure | $2,190,000 | 73% | Shell, roof, framework, general HVAC and electrical |
Reclassified basis of $810,000, or 27%, is bonus-eligible in year one, roughly $283,000 of deferred tax at a combined 35% rate. Your result depends on your tax rate and whether you can use passive losses.
Where Reasonable Engineers Disagree
This is not settled science, and any provider who says otherwise is selling.
The gray zones are few but real: the load-based split of switchgear, where engineers pick different calculation bases; finishes that read as decorative to one eye and structural to another; landscaping proximity on a large parcel; and plumbing serving both process equipment and the building.
In each case the answer matters less than the record behind it. A study showing the load calculation, the takeoff, the photographs, and the legal basis for each grouping holds up under examination. A spreadsheet showing a percentage does not. That is the argument for treating cost segregation as an evidentiary exercise, with the MACRS rules doing the arithmetic.
Frequently Asked Questions
Is a walk-in cooler 5-year or 39-year property?
It depends on construction. A modular, bolted box that can be disassembled and moved generally satisfies the Whiteco factors and is §1245 property. A cooler built into the structure with poured walls and integral framing points toward §1250. Panel construction and the removal analysis decide it, not the invoice.
Does the ATG give the right answer for each asset?
No. Publication 5653 is a guide for examiners, not law. It tells you how an examiner will evaluate your methodology and documentation. Classification rests on the statute and the case law.
Can I use a 15-year life for landscaping on a large parcel?
Only for plantings and hardscape immediately adjacent to the building that would be destroyed if the building were replaced. General landscaping far from the structure is more likely nondepreciable land. Document proximity on a site plan.
A Cost Seg Partner Your Firm Can Stand Behind
Precision Cost Segregation works alongside CPA firms, not around them. We deliver the engineering, the asset detail schedule, the §481(a) computation, and the Form 3115 workpapers your team needs, in a format that drops straight into your fixed asset system. Your client relationship stays yours.
Talk to our engineering team →
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.