The tax treatment of abandonment of leasehold improvements is straightforward in principle: when a commercial tenant permanently gives up built-out improvements at the end of a lease and receives nothing in return, the remaining adjusted basis in those improvements is deductible as an ordinary loss in the year the abandonment occurs.1Internal Revenue Service. Publication 544 – Sales and Other Dispositions of Assets The loss is reported on Form 4797, and its size depends entirely on how much depreciation you already claimed. Two things can shrink or eliminate the deduction: prior bonus depreciation or Section 179 elections that already zeroed out the asset, and any payment from the landlord, which converts the abandonment into a sale.
How Prior Depreciation Controls the Deduction
Before assuming there is a loss to claim, pull the depreciation schedules for every improvement you capitalized. Whatever you already recovered through depreciation reduces the basis available at abandonment.
Qualified Improvement Property (QIP) covers most interior work on nonresidential space placed in service after the building itself: flooring, ceilings, electrical, plumbing, interior doors, partition walls, built-in cabinetry. It excludes work that enlarges the building, elevators and escalators, and changes to the internal structural framework.2Office of the Law Revision Counsel. 26 U.S. Code 168 – Accelerated Cost Recovery System QIP uses a 15-year MACRS recovery period; nonresidential real property that isn’t QIP uses 39 years.
Bonus depreciation is where many abandonment deductions disappear. If you claimed 100% bonus depreciation when the QIP was placed in service, remaining basis is zero and there is nothing to deduct when you walk away. Tenants who built out space between 2018 and 2022 commonly face this outcome, since 100% bonus depreciation was available for QIP in those years. For improvements placed in service between 2023 and early 2025, bonus was phasing down (80%, then 60%, then 40%). The One Big Beautiful Bill Act restored a permanent 100% first-year depreciation deduction for qualified property acquired after January 19, 2025.3Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill Section 179 expensing has the same basis-reducing effect as bonus depreciation. If either election consumed the cost, the abandonment is a non-event for tax purposes.
Proving Abandonment to the IRS
An abandonment deduction is not automatic when a lease expires. The IRS treats abandonment as a specific kind of disposition that requires both an intent to permanently discard the property and a concrete act that makes the abandonment real.4eCFR. 26 CFR 1.165-2 – Obsolescence of Nondepreciable Property Moving out at the end of a lease term, without more, often does not meet the standard.
Intent
You have to show you permanently gave up all rights to the improvements with no expectation of recovering value. If your lease allowed removal and you chose not to remove, document the reason, typically that the improvements are permanently affixed and cannot be separated without destruction. Ongoing negotiation with the landlord about the improvements can undermine a claim of abandonment intent, because it suggests the improvements still have value to you.
The Overt Act
The IRS expects an identifiable event. The strongest evidence is a signed lease surrender or termination agreement that explicitly states you are relinquishing all interest in the improvements. Supporting acts include returning keys, disconnecting utilities in your name, and removing all personal property from the premises.
Timing matters. The loss is deductible in the year the abandonment actually occurs, which is not necessarily the year the lease expires on paper.5Office of the Law Revision Counsel. 26 U.S. Code 165 – Losses If you vacate in November but don’t execute the final surrender documents until February, the deduction may belong to the later tax year.
Documentation to Assemble
- Original cost records: invoices, contractor agreements, and capitalization entries showing what was spent.
- Full depreciation history, including any bonus depreciation or Section 179 amounts, so the remaining adjusted basis is provable.
- The signed lease surrender agreement confirming you have permanently relinquished all interest in the improvements and the premises.
- Photographs or inspection reports showing improvements were permanently affixed and could not be economically removed.
A six-figure ordinary loss deduction backed by nothing but a depreciation schedule and a verbal understanding will not survive audit.
Calculating the Loss
The loss equals your adjusted basis in the improvements at the time of abandonment: original capitalized cost minus all depreciation previously claimed, including bonus depreciation and any Section 179 deductions.5Office of the Law Revision Counsel. 26 U.S. Code 165 – Losses
Suppose you spent $150,000 building out a retail space in 2020 and claimed $55,000 in total MACRS depreciation over the five years before vacating. Your adjusted basis at abandonment is $95,000, and that is the deductible loss. If you also claimed $40,000 in bonus depreciation when the asset was placed in service, total prior depreciation would be $95,000, leaving a $55,000 loss instead.
Understating prior depreciation inflates the loss, and the IRS can assess tax on the difference plus penalties. If you claimed less depreciation than you were entitled to, the “allowed or allowable” rule still reduces basis by the amount you should have claimed. Skipping depreciation in earlier years does not increase your abandonment loss later.
A true abandonment with no payment produces an ordinary loss, fully deductible against ordinary business income.1Internal Revenue Service. Publication 544 – Sales and Other Dispositions of Assets There is no annual cap of the kind that limits net capital losses for individuals. A $95,000 ordinary loss reduces taxable income dollar-for-dollar.
Reporting on Form 4797
Report the loss on Form 4797, Sales of Business Property. The form covers dispositions that are not sales, including abandonments.6Internal Revenue Service. About Form 4797, Sales of Business Property The 2025 instructions direct taxpayers to enter a qualifying abandonment loss on line 10 of Part II, which handles ordinary gains and losses.7Internal Revenue Service. Instructions for Form 4797 – Sales of Business Property
You will enter the date the improvement was acquired, the date of abandonment, a gross sales price of zero, and the depreciation allowed or allowable through the disposition date. The net loss flows to your main return: Form 1040 for individuals, Form 1120 for C corporations, or Form 1065 or 1120-S with the loss passing through on Schedule K-1.
The depreciation figure on Form 4797 must match your records exactly. Bonus depreciation and Section 179 amounts claimed in the placed-in-service year belong in the total; omitting them creates an artificially large loss that will draw attention on audit.
When a Landlord Payment Changes the Answer
Any compensation from the landlord for the improvements, whether a cash payment, a rent credit, or a lease buyout, takes the transaction out of abandonment territory. It becomes a sale or exchange.
Under Section 1241, amounts received by a tenant for cancellation of a lease are treated as received in exchange for the lease. When a lease termination payment compensates you for improvements left behind, remaining basis offsets the payment. Excess payment is gain; excess basis is loss.
Gains and losses from business property held longer than one year run through the Section 1231 netting process.8Office of the Law Revision Counsel. 26 U.S. Code 1231 – Property Used in the Trade or Business and Involuntary Conversions Net Section 1231 gains are taxed at the long-term capital gains rate; net Section 1231 losses are ordinary. Any gain may be recharacterized as ordinary income to the extent of prior depreciation under the Section 1245 and 1250 recapture rules.
The practical implication: a true abandonment with no payment produces a clean ordinary loss under Section 165, without netting or recapture. Accepting even a nominal payment shifts the transaction into sale territory and complicates the math. If the improvements have little value and you are negotiating, walking away with nothing sometimes produces a better tax result than accepting a small payment.
Tearing Out Improvements Mid-Lease
You do not have to wait until the lease ends to deduct the cost of improvements you tear out. If you renovate mid-lease and replace components, whether flooring, built-in shelving, or interior walls, you can elect to treat the removed components as a partial disposition under Treasury Regulation 1.168(i)-8.9eCFR. 26 CFR 1.168(i)-8 – Dispositions of MACRS Property
The election lets you recognize a loss on the adjusted basis of the discarded component in the year of removal, rather than continuing to depreciate an asset that no longer physically exists. Without the election, the old component’s basis stays embedded in the asset, and you depreciate the old and new components simultaneously while missing a deduction you were entitled to.
To make the election, report the disposition on a timely filed return for the year the component was removed. You need the cost of the disposed component, which may require an allocation if the original build-out was priced as a lump sum, and the accumulated depreciation on that component through the disposition date. The loss goes on Form 4797. Retail and restaurant tenants who remodel every few years can use this election on each renovation to recover the remaining basis in whatever was removed.
Section 110 Allowances and Improvements You Never Owned
Improvements funded by a qualifying landlord construction allowance under Section 110 belong to the landlord for tax purposes and produce no deduction for the tenant on abandonment. The safe harbor applies to retail space with a lease term of 15 years or less, when the allowance funds qualified long-term real property that reverts to the landlord at lease end, and when the lease expressly states that purpose.10Office of the Law Revision Counsel. 26 U.S. Code 110 – Qualified Lessee Construction Allowances for Short-Term Leases Under those conditions, the tenant excludes the allowance from income, does not depreciate the funded improvements, and has no basis to deduct at abandonment.
If the allowance does not meet Section 110 requirements, because the lease is too long, the space is not retail, or the lease lacks the required language, the allowance is generally taxable income to the tenant. The tenant then capitalizes the improvement, depreciates it, and retains basis that can become deductible at abandonment, subject to the same documentation and reporting rules.