The Basics
- Partial dispositions can help building owners deduct the remaining tax basis of retired components — such as roofs, HVAC systems, and tenant improvements — rather than continue depreciating assets no longer in service.
- When properly documented and elected on a timely filed return, this strategy can accelerate deductions, improve cash flow, and keep depreciation records aligned with a property’s actual components.
- This article will explain how partial dispositions work, when opportunities may arise, how the deduction is calculated, and what timing and documentation are required.
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Why Consider Partial Dispositions Now
The IRS finalized partial disposition regulations in 2014, but many eligible taxpayers have not fully incorporated them into their tax planning. With year-end planning approaching, now is an opportune time for business owners who own real estate to revisit this valuable deduction opportunity.
Before we get into the nuance of what a partial disposition is and why it’s important, let’s first step back for a look at how they might come into play.
When a business owner replaces part of a building such as a roof, HVAC system, elevator, façade, plumbing system, electrical system, or tenant-improvement buildout, the old component often still has tax basis (essentially, its original allocated cost minus depreciation already taken) remaining. A partial disposition allows the owner to recognize that remaining basis as a loss when the old component is retired, rather than continuing to depreciate it as part of the building.
For owners of commercial real estate and business-use buildings, partial dispositions can be a valuable tax planning tool during renovations, replacements, casualty events, tenant changes, and major capital projects. The opportunity is especially important because buildings and their structural components are generally treated as one asset for depreciation purposes unless the tax rules allow — or require — the owner to separately account for the disposed portion.
What Is a Partial Disposition?
A disposition generally occurs when an asset is sold, exchanged, retired, abandoned, destroyed, or permanently withdrawn from use in a trade or business. A partial disposition applies when only a portion of a larger asset is disposed of. In the building context, that disposed portion may be a structural component or part of a structural component.
For example, if a building owner replaces an existing HVAC unit, the new unit is typically capitalized and depreciated. Without a partial disposition election, the owner may continue depreciating the old unit as part of the original building basis even though it is no longer in service. But with the election, the old unit is treated as though it has been disposed of, so depreciation on that component stops, and the owner may recognize a loss for its remaining adjusted basis.
Why This Matters
Partial dispositions matter because they can prevent a business owner from depreciating two assets serving the same function: the retired component embedded in the original building basis and the new replacement component that is added to the building. That’s helpful because recognizing the loss on the retired component may accelerate deductions, improving after-tax cash flow in the year of the renovation or replacement.
The benefit depends on whether the owner can reasonably determine the disposed component’s original unadjusted basis and accumulated depreciation. However, if the original cost records do not separately identify the component, tax rules do allow reasonable estimation methods.
Among the reasonable estimation methods the IRS allows for partial disposition elections:
- Allocating original building basis using replacement cost
- Discounting current replacement cost back to the original placed-in-service year
- Using a cost-segregation-type analysis
Example: Roof Replacement and Partial Disposition Election
Project facts: Assume a taxpayer purchased a commercial building in July 2012 and allocated $2,400,000 of the purchase price to the building, which is depreciated over 39 years. The original cost records do not separately identify the roof. In June 2026, the taxpayer replaces the roof at a cost of $400,000.
Estimating the retired roof’s basis: Because the roof was not separately stated in the original records, the taxpayer uses the Producer Price Index to discount the $400,000 current replacement cost back to 2012. This method produces an estimated original roof basis of approximately $260,000.
Calculating the remaining adjusted basis: Depreciation on the estimated roof component from July 2012 through June 2026 totals roughly $92,800. After subtracting that depreciation from the $260,000 estimated original basis, the remaining adjusted basis is about $167,200.
Tax result with the election: If the taxpayer makes a partial disposition election, the $167,200 remaining adjusted basis is deducted as a loss on the 2026 return.
Bottom line: Without the election, the taxpayer continues depreciating the retired roof at roughly $6,700 per year for another 24 years, while also beginning depreciation on the new $400,000 replacement roof. At a 37% marginal tax rate, making the election accelerates approximately $62,000 of tax benefit into the current year.
Key Benefits for Building Owners
- Accelerated deductions: The remaining adjusted basis of the retired component may be deducted in the year of disposition, rather than depreciated over many additional years.
- Cleaner depreciation records: The old component can be removed from the building’s depreciable basis, reducing the risk of depreciating both the old and new components at the same time.
- Improved project economics: The current tax deduction may improve after-tax cash flow during a renovation, replacement, or tenant-turnover project.
- Better alignment with economic reality: If a component is physically removed or permanently retired, the tax records can better reflect what remains in service.
- Potential support for broader tax planning: Partial disposition analysis can complement repair-versus-capitalization reviews, cost segregation studies, casualty loss analysis, and fixed asset clean-up projects.
Common Planning Opportunities
- Major building replacements: Roofs, HVAC systems, elevators, windows, façades, plumbing systems, electrical systems, and fire-protection systems may create partial disposition opportunities when old components are retired.
- Tenant-improvement demolition: When a tenant moves out and prior buildout costs are removed or replaced, there may be an opportunity to write off the remaining basis of demolished tenant improvements.
- Renovation planning: Identifying disposed components before or during a project can improve documentation and make it easier to support the tax deduction.
- Cost segregation coordination: A cost segregation study may help identify components, allocate original basis, and support partial disposition calculations.
- Casualty events and involuntary conversions: Certain events may require partial disposition treatment, making timely review important after storms, fires, flooding, or other damage.
- Real estate acquisitions and fixed asset clean-up: Reviewing existing depreciation schedules can reveal assets that have been replaced, retired, or duplicated in the fixed asset records.
Documentation and Workpaper Support
To support a partial disposition, the owner or their tax advisor should document the disposed component, the date or tax year of disposition, the project that caused the retirement, the method used to estimate the original unadjusted basis, accumulated depreciation through the disposition date, and the resulting gain or loss.
Helpful records may include:
- Invoices
- Contractor schedules of values
- Demolition records
- Fixed asset listings
- Depreciation schedules
- Cost segregation reports
- Photographs
- Internal project approvals
Timing and Election Considerations
The partial disposition election generally must be made on a timely filed original return, including extensions, for the tax year in which the component is disposed of. This timing is especially important for projects that span multiple tax years.
For example, if a taxpayer begins an improvement project in 2026 and completes it in 2027, the new improvements may be capitalized in 2027 when the project is placed in service; however, any components disposed of in 2026 generally must be reported on the 2026 return. If those dispositions are not identified and reported on the appropriate return, the reelated deductions may be lost. The election is made by reporting the related gain, loss, or other deduction on that return; a separate election statement generally is not required. Because revoking the election can be difficult, the analysis should be completed before the return is filed.
Get Guidance
Think you may have a partial disposition opportunity? Contact our one of our cost segregation specialists for guidance. We can help you assess your project, identify potential deductions, and document them before the applicable return is filed.