The partial asset disposition election under Treas. Reg. §1.168(i)-8 lets an owner who removes building components in a renovation stop depreciating them and deduct their remaining basis as a loss, when it is made on a timely filed return (including extensions) for the year they are retired. A cost segregation study is one way to establish each removed component's basis.
What Happens to the Old Components When You Renovate?
When you renovate a building, you usually keep depreciating something that no longer exists. The old lighting, the demolished interior walls, the ceiling you replaced — their remaining tax basis often stays buried inside the building's depreciation schedule, quietly recovering over decades even though the physical asset is in a dumpster. It stays buried because a building carried as a single line on that schedule has no component to retire, and the component-level detail a cost segregation study produces is what creates one.
These are "ghost assets," and they create a double problem: you carry basis for something you no longer own, and when you eventually sell, that phantom basis complicates the gain calculation. Both halves of that problem trace back to the same gap in the records, and cost segregation is the exercise that fills it.
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The Partial Asset Disposition Election
The tangible property regulations under §1.168(i)-8 offer a fix: the partial asset disposition (PAD) election. When you replace a component of a building, you may elect to treat the removed component as disposed of — recognizing a loss for its remaining undepreciated basis in the year of disposition, and stopping depreciation on it. Instead of recovering the cost of a wall you demolished over the building's remaining life, you deduct what is left of it now.
The PAD election is generally made by claiming the loss on a timely filed return (including extensions) for the year the component is retired. It is a year-of-disposition decision, which is what makes the renovation year the moment to get this right.
Why Are PAD and QIP Two Halves of the Same Renovation?
A renovation is simultaneously a creation and a removal. The new interior work you install is often Qualified Improvement Property — 15-year, and bonus-eligible at the rate the January 19, 2025 acquired-date test sets. The old components you ripped out are candidates for a partial asset disposition. Handled together, the same project produces an accelerated deduction on the new QIP and a current loss on the disposed components. Handled separately — or not at all — the new work may be over-depreciated as 39-year property and the old work keeps haunting the schedule.
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What Do You Need to Know to Make the PAD Election?
The PAD election is only as good as your ability to answer two questions about the removed component: what was it, and what is its remaining basis. Original construction records rarely break a building into the component-level detail you need, and a contractor's demolition invoice tells you what came out but not what it cost when it went in. Bridging that gap — reconstructing the original cost of the disposed component and its accumulated depreciation — is an engineering-and-records exercise. A cost segregation study of the original building establishes the component basis that a partial disposition then draws on; without that component detail, the disposition loss is difficult to substantiate.
The Sequence That Works
The cleanest version of this looks like a sequence rather than a single event:
- Establish the building's component-level basis (a cost segregation study of the original property).
- When you renovate, identify the components being removed and their remaining basis, and make the partial-disposition election for the year of retirement.
- Classify the new interior work — much of it likely QIP — and apply the recovery period and bonus depreciation treatment that applies for the placed-in-service year.
The result is a renovation that is fully accounted for in both directions: you stop depreciating what you removed and you accelerate what you added. The connective tissue in all of it is component-level documentation — the same record that makes a cost segregation study supportable is what makes a partial asset disposition stand up. Method and scope vary by provider, and how cost segregation firms compare sets out those differences.
Renovating this year? Start your study before the work is capitalized so the component records exist when the election window opens.
Related reading for property still on the older TCJA phase-down rather than the current rate: the 2026 bonus depreciation phase-down math.
Related: Are Demolition Costs Deductible? Section 280B, the 75% Walls Test and Cost Segregation, Removal Costs in a Renovation: Deduct or Capitalize? How Cost Segregation Decides and Before-and-After Photos for a Renovated Property: What a Cost Segregation Study Needs.
Frequently Asked Questions
What is a partial asset disposition election?
It is an election under the tangible property regulations at §1.168(i)-8 to treat a replaced building component as disposed of, recognizing a loss for its remaining undepreciated basis in the year of disposition and stopping depreciation on it. Instead of recovering the cost of a demolished wall over the building’s remaining life, the owner deducts what is left of it in the year the component is retired.
Why does a partial asset disposition election depend on a cost segregation study?
Because the election is only as good as your ability to say what the removed component was and what its remaining basis is, and original construction records rarely break a building into that component-level detail. A cost segregation study of the original building establishes the component basis that a partial disposition then draws on; without that detail, the disposition loss is difficult to substantiate. A demolition invoice tells you what came out, but not what it cost when it went in.
When does the partial asset disposition election have to be made?
It is generally made by claiming the loss on a timely filed return, including extensions, for the year the component is retired. That makes it a year-of-disposition decision, which is why the renovation year is the moment to identify what was removed and what it was worth. The timing and documentation requirements are fact-specific and are confirmed with a tax advisor before the return is filed.
Is the new work in a renovation depreciated over 15 years as Qualified Improvement Property?
Interior work installed in an existing building is often Qualified Improvement Property, which is 15-year and bonus-eligible rather than 39-year property. Handled together with the disposition of the old components, the same project produces an accelerated deduction on the new QIP and a current loss on what was removed. Handled separately, or not at all, the new work may be over-depreciated as 39-year property while the old work keeps haunting the schedule.
What is a ghost asset on a depreciation schedule?
A ghost asset is a building component that has been removed but whose remaining tax basis stays inside the building’s depreciation schedule, still recovering over decades after the physical asset is in a dumpster. It creates a double problem: basis carried for something no longer owned, and a phantom basis that complicates the gain calculation on an eventual sale. The partial asset disposition election under §1.168(i)-8 is the fix, and component-level records are what make it workable.
