What is bonus depreciation in commercial real estate? Bonus depreciation, formally the special depreciation allowance under Section 168(k), lets a taxpayer deduct a large percentage of the cost of qualifying property in the year it is placed in service instead of spreading that cost across the full recovery period. One rule decides almost everything about eligibility: the property must have a recovery period of 20 years or less. A commercial building, depreciated over 39 years, does not.
That single sentence is where most of the confusion in this area starts and ends, because the deduction people associate with buying a building comes from the shorter-lived property inside and around it rather than from the building. This guide covers the test a component has to pass, what qualifies, what is carved out by statute, and why qualifying is not the same as deducting. For the wider picture of how these provisions fit together, start with the guide to the tax benefits of commercial real estate.
Key Takeaways
- Bonus depreciation applies only to property with a MACRS recovery period of 20 years or less, which excludes the 39-year commercial building itself.
- P.L. 119-21 reinstated the 100% allowance for certain qualified property acquired and placed in service after January 19, 2025, with a 40% election available.
- Qualified improvement property, site improvements, and 5- and 7-year personal property are where the deduction actually comes from in a commercial acquisition.
- Used property can qualify, but only if acquired by purchase, not from a related party, and not previously used by the taxpayer.
- Qualifying is not the same as deducting, because passive activity rules, basis, and at-risk limits are applied afterward on the investor's own return.
- Accelerated deductions on shorter-lived components are generally recaptured as ordinary income at sale, so the benefit is timing rather than permanent savings.
| MACRS recovery period | Bonus depreciation eligible | |
|---|---|---|
| Land | Not depreciable | No |
| Building shell and structure | 39 years | No |
| Roof, HVAC, fire protection systems | 39 years | No |
| Elevator and escalator equipment | 39 years | No |
| Qualified improvement property | 15 years | Yes |
| Site improvements (parking, sidewalks) | 15 years | Yes |
| 5- and 7-year personal property | 5 or 7 years | Yes |
Where Bonus Depreciation Stands After the 2025 Law Change
The percentage available has changed repeatedly, which is why two acquisitions in the same portfolio can be treated differently. IRS Publication 946 states that P.L. 119-21, commonly known as the One Big Beautiful Bill Act, reinstated the 100% special depreciation allowance for certain qualified property acquired and placed in service after January 19, 2025.
An election is available to take a 40% allowance instead, for the first tax year ending after that date, which sounds like a strange thing to want until you consider a taxpayer who has no capacity to use a large deduction in the current year and would rather keep the basis on the schedule. For several years before the reinstatement, the allowance was stepping down in annual increments, so property acquired in an earlier year is governed by the percentage in effect for that year rather than by the current rule.
Two dates matter, not one. Publication 946 ties the 100% allowance to property both acquired and placed in service after January 19, 2025, which means a property under a binding contract signed before that date can sit outside the reinstated rule even though it was placed in service well after it. Acquisition date and placed-in-service date are separate facts, and for anything near the boundary they need to be established rather than assumed.
The same law added a narrow new category at Section 168(n), qualified production property, which Publication 946 describes as eligible for a 100% allowance when placed in service after July 4, 2025, with construction beginning or acquisition occurring after January 19, 2025. That provision reaches certain nonresidential real property used in production activity, and it is the rare instance where a long-lived building component gets full expensing at all. It is a specific carve-out for a specific use, not a general opening for commercial real estate.
The Test a Component Has to Pass
Eligibility is decided component by component, not building by building. Publication 946 describes qualified property in terms of recovery period and acquisition history, and a component that fails any part of the test is simply depreciated on its normal schedule. Three questions settle nearly every case.
Does it have a recovery period of 20 years or less?
Publication 946 lists property with recovery periods of 5, 7, 10, 15, or 20 years, along with qualified improvement property, water utility property, and off-the-shelf computer software. Nonresidential real property is recovered over 39 years, so the shell falls outside the list by a wide margin rather than by a technicality.
Was it acquired by purchase, and from whom?
Used property can qualify, which is the change that made these studies common on acquisitions of existing buildings rather than only on new construction. The conditions are specific: the property must be acquired by purchase, must not be acquired from a related party, and must not have been previously owned or used by the taxpayer. A sale-leaseback, a transaction between commonly controlled entities, or a buyout of a partner's interest in property the taxpayer already used can each fail that test in ways that are invisible from the building itself.
Was it placed in service, or only paid for?
The allowance attaches to the year property is placed in service, meaning ready and available for its assigned use, rather than the year it was paid for. A renovation finished in January produces no deduction for the prior December, regardless of when the invoices were settled. Placed-in-service timing is the most common reason a deduction an investor expected in one year appears in the next.
What Actually Qualifies Inside a Commercial Property
Three categories carry nearly all of the bonus depreciation available on a commercial acquisition, and none of them is the building. They are shorter-lived personal property, site improvements, and qualified improvement property, and identifying them is what an engineering-based cost segregation study is for.
Personal property with 5- and 7-year lives is the first category. Items such as specialty electrical serving equipment rather than the building, floor coverings, removable partitions, cabinetry, signage, and certain fixtures can be separated from the structure and assigned their own shorter schedules. They sit well under the 20-year ceiling, so once reclassified they are eligible.
Site improvements are the second. Parking areas, sidewalks, curbing, site drainage, fencing, and exterior lighting are generally treated as land improvements with a 15-year recovery period, which puts them inside the ceiling as well. On a single-tenant retail property with a large paved lot, this category is often larger than investors expect.
Qualified improvement property is the third and the most technical. It covers improvements made to the interior portion of an existing nonresidential building after the building was first placed in service, and it carries a 15-year recovery period, which is precisely what makes it eligible. Interior buildout, finishes, and non-structural interior work commonly land here.
None of this creates deductions that did not exist. Reclassification changes when the cost is recovered, not how much of it there is over the life of the asset, and as the comparison shows, the dividing line is the recovery period assigned to each component rather than anything about the property's quality or location. The trade-off for pulling the deduction forward arrives at sale, which is covered further down.
What Does Not Qualify, and Why
The exclusions are not edge cases. They are the largest items in a purchase price, which is why a bonus depreciation deduction is always a fraction of a building's cost rather than most of it. Four categories account for nearly all of what gets left behind.
The building shell and structure is the first and biggest. Foundation, load-bearing walls, structural members, and the roof are nonresidential real property recovered over 39 years. Nothing about a cost segregation study changes their classification, and no amount of reasonable allocation moves them under the ceiling.
Major building systems are the second, and this is where investors are most often surprised. A roof replacement, an HVAC system serving the building, fire protection and alarm systems, and security systems are improvements to nonresidential real property rather than qualified improvement property, so they are recovered over 39 years and are not eligible for the special depreciation allowance. Some of those items can be expensed under a different provision, Section 179, which has its own dollar limits and its own income limitation and is a separate analysis rather than a substitute.
Specific statutory exclusions from qualified improvement property are the third. Publication 946 excludes the enlargement of a building, elevator and escalator equipment, and the internal structural framework from the definition. An interior project can be non-structural in every ordinary sense and still contain items that fall outside the category.
Land is the fourth and the simplest. Land is never depreciable at all, which is why the allocation between land and improvements has to be made before any of this arithmetic runs. A property in an expensive land market carries less depreciable basis than an identical building on cheaper ground, and that gap is decided before a single component is reclassified.
Qualifying Is Not the Same as Deducting
A deduction that qualifies at the property level still has to survive three limits applied at the investor level, and each one is tested on the individual return rather than on the entity's books. This is the step that turns a large first-year figure into a much smaller, or entirely deferred, benefit for many taxpayers.
The passive activity rules come first. IRS Publication 925 treats rental activity as passive even where the taxpayer materially participates, unless the taxpayer is a real estate professional, and it states that generally the passive activity loss for the tax year is not allowed. A passive loss ordinarily offsets passive income rather than wages or portfolio income, with unused amounts suspended and carried forward until there is passive income to absorb them or the interest is disposed of. Publication 925 sets the real estate professional tests at more than half of personal services performed in real property trades or businesses in which the taxpayer materially participated, and more than 750 hours of such services during the year.
Basis and at-risk limits come next. A loss is not deductible beyond a partner's adjusted tax basis in the interest, and the at-risk rules impose a separate ceiling. Both are calculated on the investor's own facts, and the capital account shown on a tax form resembles basis without being the same figure.
For an investor holding property through a pooled vehicle, all of this arrives indirectly. The entity takes the deduction, allocates a share of the resulting loss, and reports it on a partnership tax form, which is why a year with cash distributions can still show a reported loss. The mechanics of that form are covered in the guide to how a fund reports its numbers on a Schedule K-1, and the structure that produces the allocation is described in how a commercial real estate fund is organized and paid.
What the Accelerated Deduction Costs Later
Pulling deductions forward is a timing decision with two costs attached: a different tax character at sale, and a smaller depreciation schedule in every year that follows. Both are knowable in advance, and neither shows up in the first-year number that gets quoted.
Recapture is the larger of the two. Depreciation claimed on the building is treated at sale as unrecaptured Section 1250 gain, taxed at a maximum 25% rate. The shorter-lived components identified in a cost segregation study are generally Section 1245 property, and depreciation on those is typically recaptured as ordinary income. That is the trade embedded in acceleration. A deduction taken today against ordinary income can return as ordinary income later, so the benefit is the time value of the deferral and any difference in rates, rather than a permanent reduction in tax.
The second cost is arithmetic. In a hypothetical illustration using round numbers chosen for clarity rather than drawn from any transaction, if $200,000 of a purchase is reclassified into qualifying shorter-lived components and fully deducted in year one, that $200,000 is gone from the schedule. Years two through thirty-nine carry a smaller annual deduction than they otherwise would have, which matters to an investor whose capacity to use deductions rises over time rather than falls.
Two practical points follow. A taxpayer who does not want the allowance can elect out, and Publication 946 describes that election as made by class of property on a timely filed return including extensions, which is an all-or-nothing choice within each class rather than a dial. And a study costs real money, so the expense has to be weighed against the deduction it is expected to accelerate and the taxpayer's ability to use that deduction at all.
Every determination above turns on facts specific to the taxpayer, including marginal rate, basis, holding period, residency, and whether passive income exists to absorb a loss. Freedom Commercial Real Estate does not provide tax advice, and nothing here is tax advice. Whether a particular component qualifies, and what the deduction would be worth on a particular return, belongs with a CPA or tax advisor rather than with a general article.
Freedom Commercial Real Estate is a Dallas-based commercial real estate firm that publishes investor education, and this guide exists because the qualification boundary in Section 168(k) usually gets compressed into one sentence that leaves out the part doing the work. A question about anything above, or a depreciation topic worth taking apart next, can go to the team at info@freedomcre.net, and the guide to the tax benefits of commercial real estate linked earlier is the natural next read.
Frequently Asked Questions
Q: Does bonus depreciation apply to the purchase of a commercial building?
A: Not to the building itself. Nonresidential real property is recovered over 39 years, and the special depreciation allowance reaches property with a recovery period of 20 years or less. What can qualify is the shorter-lived property inside and around the building, including 5- and 7-year personal property, 15-year site improvements, and qualified improvement property, which is what a cost segregation study is performed to identify.
Q: Is 100% bonus depreciation available now?
A: IRS Publication 946 states that P.L. 119-21, the One Big Beautiful Bill Act, reinstated the 100% special depreciation allowance for certain qualified property acquired and placed in service after January 19, 2025, with an election available to take 40% instead for the first tax year ending after that date. Property acquired before that date falls under the percentage in effect for its own year, so the answer depends on the specific asset.
Q: Does used property qualify for bonus depreciation?
A: It can. The conditions are that the property was acquired by purchase, was not acquired from a related party, and was not previously owned or used by the taxpayer. Those tests are about transaction history rather than about the property, so transfers between commonly controlled entities and acquisitions of property the buyer already used are the cases most likely to fail while looking ordinary from the outside.
Q: Can a bonus depreciation loss from a real estate fund offset my salary?
A: Usually not. IRS Publication 925 treats rental activity as passive, and passive losses generally offset passive income rather than wages, with unused amounts suspended and carried forward. Basis and at-risk limits apply separately. Whether any of a given allocation is deductible in a given year depends on your own facts, which makes this a question for your CPA or tax advisor rather than one with a general answer.
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