Are Demolition Costs Deductible? §280B and Cost Segregation

Demolishing a building is not deductible: under §280B and Treas. Reg. §1.280B-1, the cost of demolishing a structure (a building including its structural components) and any loss on the demolished structure are added to the basis of the land, which is never depreciated. Cost segregation cannot change that rule, but a cost segregation study shapes nearly everything around it: whether the project is a demolition at all, how much of the purchase price was ever assigned to what comes down, and how fast the new construction is recovered.

A renovation that removes components without demolishing the building is treated differently. Under Treas. Reg. §1.168(i)-8, an owner can elect to deduct the remaining basis of a retired component, such as a roof, in the year it is retired, and under Treas. Reg. §1.263(a)-3(g)(2) the cost of removing it is then not capitalized. Both depend on knowing what the removed component cost, and the regulation lists a study allocating a building’s cost to its components, which is what cost segregation produces, among the reasonable ways to find it (Treas. Reg. §1.168(i)-8(f)(3)(i)(C)).

What does section 280B do to demolition costs?

Section 280B denies the owner or lessee of a structure any deduction for amounts spent to demolish it or for any loss sustained on account of the demolition, and adds both to the capital account of the land on which the structure stood. Treas. Reg. §1.280B-1(b) defines a structure as a building, including its structural components, and the regulation applies to demolitions beginning on or after December 30, 1997.

Two amounts are caught. The first is the demolition spend: the contractor, the dumpsters, the permits for the tear-down. The second is the building’s remaining adjusted basis, the cost not yet recovered through depreciation. Both become land basis, so neither is recovered until the land is sold or otherwise disposed of in a taxable transaction, when the higher land basis reduces the gain or increases the loss.

Section 1.168(i)-8(e) of the disposition regulations opens with the words “Except as provided by section 280B”, so the partial-disposition loss discussed below is not a way around a true demolition. If the structure is demolished, §280B controls.

When does a gut renovation count as a demolition?

Rev. Proc. 95-27 gives a safe harbor: a modification of a building (historic structures under §47(c)(3) have an extra condition) is not treated as a demolition for §280B when at least 75% of the existing external walls are retained in place as internal or external walls and at least 75% of the existing internal structural framework is retained in place. Both tests must be met to use the safe harbor. A project that misses one of them is not automatically a demolition, but it loses the safe harbor and is judged on its facts.

This is where a cost segregation file earns its keep. The safe harbor is measured, not argued: the record should show how much of the external walls and framework existed before the work and how much remained after it. Drawings of the existing building, the demolition scope in the contractor’s agreement, and dated photos taken before the work started and after the tear-out are the evidence that settles it.

Whether tear-out is a write-off or land basis is decided by what stayed standing, so the record of what stayed standing is worth as much as the invoice.
Howard Krieger, ClickDrag Finance

What happens when you buy a property planning to tear it down?

When land and buildings are bought with the intention of demolishing the buildings, Treas. Reg. §1.165-3(a) allocates the entire purchase price to the land, with a limited exception: if the building is used in a business or held for rent before it comes down, part of the price may be allocated to it, capped at the present value of the rent expected over that period. When the plan to demolish is formed after the purchase, §280B still sends the demolition cost and the remaining basis to land.

The same logic reaches a cost segregation study of an acquired property. The IRS Cost Segregation Audit Techniques Guide (revision of February 6, 2025, Chapter 5) tells IRS reviewers that assets scheduled to be demolished should have no basis or value assigned to them, and that abandonment losses incurred in connection with a demolition should be considered for capitalization to land (citing TAM 9131005). A study of a building bought for redevelopment therefore allocates the price to what the buyer is keeping, valued as of the purchase date, and gives no value to what was scheduled to come down.

Can cost segregation still help when part or all of a building comes down?

Yes, mostly on the new work. A cost segregation study of the replacement construction separates the 5-, 7- and 15-year property from the 27.5-year or 39-year building, exactly as it would for any new build, and the demolition sits outside the study in land basis.

The study also has to sort the site work correctly. The cost tables in Chapter 7 of the IRS Cost Segregation Audit Techniques Guide treat the one-time cost of demolition, clearing and grubbing as part of the land, while clearing, grading, excavating and removal costs directly associated with setting the new building, or with a land improvement, become part of the cost of that building or land improvement. A pay application that lumps “site work” into one line forces the whole amount to its least favorable treatment, so the contract should price demolition separately from excavation and site preparation.

For the 5-, 7- and 15-year property in the new construction (bonus does not apply to the 27.5- or 39-year building), 100% bonus depreciation is permanent for qualified property acquired after January 19, 2025. Property the owner builds, or has built under a written binding contract entered into before construction began, is acquired when physical work of a significant nature begins, with a safe harbor when more than 10 percent of the total cost (excluding land and preliminary activities) has been paid or incurred (Treas. Reg. §1.168(k)-2(b)(5)(iv)). Your tax advisor should confirm which date applies to each part of the project.

What changes when components come out, and new work is placed in service, by December 31?

For a calendar-year taxpayer, replacement work placed in service (ready and available for its intended use) by December 31, 2026 is depreciated on the 2026 return, and a component retired in the same renovation in 2026, in a project that is not a demolition, can produce a partial-disposition loss on that 2026 return if the partial-disposition election is made, because the loss belongs to the year of the disposition.

The election is made by reporting the loss on the timely filed original 2026 return, including extensions (Treas. Reg. §1.168(i)-8(d)(2)(ii)), it generally cannot be made later through an accounting method change, and once made it can be revoked only with IRS consent through a private letter ruling (§1.168(i)-8(d)(2)(v)).

A cost segregation study that covers the renovation year can therefore support both halves of the same project on one return: the loss on what came out and the faster recovery on what went in. When the study is what supplies the removed component’s basis, it has to be finished before the 2026 return is filed (including extensions), because the election generally cannot be made later. When a component was bought already scheduled for removal, a cost segregation study may assign it little or no value, so the partial-disposition loss on it may be small or nothing; the loss is largest for components the owner placed in service and used before deciding to replace them.

Do not tear out components, or rush a placed-in-service date, for the deduction alone. The tax treatment follows the work; it is not a reason to do it.

Which records settle a demolition question?

The files that answer these questions are ordinary project records, kept in a form that can be read later:

Purchase records: the purchase agreement, the closing statement and any appraisal, which together show what was bought and whether redevelopment was planned at the time.
Condition before the work: dated photos and drawings of the building as bought and just before the work started.
The demolition and removal scope: the contractor’s agreement and invoices with demolition, removal, excavation and site preparation priced on separate lines.
What stayed standing: drawings or measurements of the external walls and internal framework kept, for the Rev. Proc. 95-27 tests.
Completion: progress and completion photos, permits, and the certificate of occupancy where local law requires one, which also support the placed-in-service date.

Our partial asset disposition article covers the write-off of retired components in more depth, and the removal-costs article covers what happens to the cost of tearing them out. Before the return work starts, the cost segregation qualifier tells you whether a study fits the property, and how to compare cost segregation companies lists what to ask a provider about renovation work.

Frequently Asked Questions

Are demolition costs deductible?

No, not for the demolition of a structure. Under §280B and Treas. Reg. §1.280B-1, the cost of demolishing a building (including its structural components) and any loss on the demolished building are added to the basis of the land, which is not depreciated and is recovered only when the land is sold.

Is removing a roof or interior walls during a renovation a demolition under section 280B?

Not when the building itself is kept. Under the Rev. Proc. 95-27 safe harbor, a modification is not treated as a demolition when at least 75% of the existing external walls are retained in place as internal or external walls and at least 75% of the existing internal structural framework is retained in place, and in that case a retired component can be a partial disposition under Treas. Reg. §1.168(i)-8.

Can cost segregation be used to deduct the remaining basis of a removed component?

Yes, when the project is not a demolition and the partial-disposition election is made on the timely filed original return for the year the component was retired. Treas. Reg. §1.168(i)-8(f)(3)(i)(C) lists a study allocating the building’s cost to its components, the core of a cost segregation study, as a reasonable way to find the removed component’s basis when the records do not show it.

Does a cost segregation study assign value to a building I bought to demolish?

Generally no. Treas. Reg. §1.165-3(a) allocates the price of property bought with the intent to demolish its buildings to the land, apart from a limited allocation to a building used in a business or held for rent before demolition, and the IRS Cost Segregation Audit Techniques Guide says assets scheduled to be demolished should have no basis assigned to them.

How should demolition be shown on contractor invoices for cost segregation?

As its own line, separate from excavation, grading and site preparation. The IRS Cost Segregation Audit Techniques Guide treats one-time demolition and clearing as land cost, while site work directly associated with the new building or a land improvement becomes part of that asset’s cost, so a lump-sum site-work line can push the whole amount into the least favorable treatment in a cost segregation study.

Are Demolition Costs Deductible? Section 280B, the 75% Walls Test and Cost Segregation