Partial Asset Disposition Election

How it works

Before 2014, a taxpayer could not recognize a loss on the retirement of a portion of an asset. Replace a building's roof, and the old roof's undepreciated basis kept riding along inside the building's basis, depreciating over the building's full 27.5- or 39-year recovery period long after the roof itself was gone.

Treas. Reg. section 1.168(i)-8 changed that, for tax years beginning on or after January 1, 2014. It is issued under the general depreciation authority of section 168(i), together with the basis mechanic in section 1016(a)(2) that reduces basis by depreciation "allowed or allowable." The regulation treats each building, including its structural components, as a single asset for disposition purposes; a later improvement or addition placed in service after the original building becomes its own separate asset. A "disposition" is a sale, exchange, retirement, physical abandonment, destruction, or other permanent withdrawal from use, and the partial disposition election extends that definition to a portion of an asset rather than the whole thing.

The election itself lets an owner with a depreciable interest in a building treat the retirement of a structural component, a roof, an HVAC system, plumbing, an elevator, windows, as a disposition of a slice of the building asset. Its remaining adjusted basis is written off as a loss, and it stops depreciating. The replacement is capitalized as its own new asset with its own depreciation clock; it does not inherit the retired component's basis. How that replacement is later depreciated, on the ordinary schedule, through bonus depreciation, or under a section 179 election, is a separate question I cover in my Florida depreciation rules guide and my Section 179 guide.

This is an acceleration, not a permanent exclusion, the same category of benefit as a cost segregation study: the total dollars recovered, and their ordinary character, do not change. Only the timing does, and timing is worth something measured against today's marginal rate.

A voluntary retirement is ordinarily a physical abandonment, not a sale or exchange, and the regulation recognizes the loss as the full remaining adjusted basis, reported on Form 4797, Part II. Recapture only ever claws back a gain, so an abandonment loss carries none of it. That only reenters the picture if one of the mandatory triggers below instead produces a gain on a sale of a portion of the asset, which is recaptured exactly like a sale of the whole property.

What this is worth in Florida

Every Florida rental owner who replaces a roof, an air conditioning system, or a water heater bank runs into this election. Florida has no individual income tax, so no state layer sits on top of the loss or the ordinary deduction it produces. What makes this genuinely Florida-shaped is the storm exposure: hurricane and named-storm damage is a casualty event, and a casualty-driven component retirement is one of the fact patterns where recognizing the partial disposition is mandatory rather than a choice, covered next.

Who this applies to

There is no entity-type gate. An individual, a single-member LLC, a partnership, an S corporation, or a C corporation, any taxpayer with a depreciable interest in a building or its structural components can make the election. A lessee who capitalized its own leasehold improvement can elect on that improvement's later retirement; a lessee who never paid for the underlying building or its original component has no depreciable interest in it and cannot.

The disposed component has to be MACRS property, placed in service after December 31, 1986. A pre-1987 building or component sits entirely outside the regulation: no partial disposition, no loss.

Basis has to remain. A component already depreciated down to zero has nothing left to write off, and the taxpayer cannot substitute a different asset that still carries basis instead.

The loss this election produces is still a deduction of the rental activity itself, and section 469 governs whether that deduction does anything this year. Without material participation, the loss is passive, like ordinary depreciation: it offsets only passive income from other activities, a $25,000 section 469(i) allowance for active participation, phased out between $100,000 and $150,000 of modified adjusted gross income, real estate professional status, or a short-term rental's non-passive treatment. Absent one of those, the loss suspends and produces nothing this year. Confirming usability matters here exactly as it does for a passive loss produced any other way, and real estate professional status is one route that makes it usable immediately.

Electing a partial disposition of one component does not, on its own, free up other losses already suspended from that same rental activity. Releasing suspended losses requires disposing of the taxpayer's entire interest in the passive activity in a fully taxable transaction, and retiring one roof or one HVAC system is a disposition of a component, not of the taxpayer's entire interest in the activity.

A whole-building demolition is a different regime entirely. Where a structure is demolished under section 280B, the undepreciated basis and the demolition costs are added to the land's basis instead of deducted, and section 280B displaces this regulation for a full teardown.

For an ordinary voluntary replacement, recognizing the partial disposition is optional. Four fact patterns take that choice away and make recognition mandatory instead: a casualty event, which is the Florida hurricane case; a disposition of a portion of an asset where gain goes unrecognized, in whole or in part, under a section 1031 exchange or an involuntary conversion under section 1033; a carryover-basis transfer described in section 168(i)(7)(B); or a sale of a portion of an asset. In each of those, the disposition is deemed to occur and has to be accounted for.

What it requires

The election is made by reporting the loss on the taxpayer's timely filed original federal return, including extensions, for the year the component is disposed of. There is no separate form or election statement. The return itself, correctly reporting the loss, is the election.

That deadline is the single most consequential fact about this election. Once the year closes without the loss reported on a timely original return, it is gone in the ordinary case, with no general late-election route the way a missed depreciation method has one. Two narrow exceptions exist: a Form 3115 accounting-method-change route, available only where the IRS, on examination, disallows a repair deduction claimed for the replacement and forces capitalization, and only if the taxpayer still owns the asset at the start of that year; and a one-time amended-return window for tax years beginning in 2012 through September 19, 2013, closed for over a decade. Revoking an election already made requires a private letter ruling, so the return, once filed, is effectively final.

• Specific identification of the disposed asset, whenever practicable, drawn from the taxpayer's own books and records. A fallback to FIFO, oldest matching-recovery-period asset first, or Modified FIFO applies only when specific identification is genuinely impracticable, and LIFO is expressly barred as an identification method.
• A reasonable method for sizing the disposed portion's basis, needed when the original acquisition records never broke the component's cost out separately, the near-universal case for a roof or an HVAC system bought as part of a whole building. Producer Price Index discounting for a restoration, pro rata allocation by replacement cost, or a cost-segregation-style component study are all acceptable, applied consistently to every later disposed portion of that same asset.
• Removal costs riding on the same election. The cost of physically removing the retired component is not required to be capitalized into the replacement's basis if the taxpayer took the retired component's adjusted basis into account in realizing the loss. Skip the election, and the removal cost is generally swept into the new component's capitalized basis instead.

What you need to document

The taxpayer carries the burden of proof on every part of this election: that a disposition occurred at all, which asset it came from, what portion was disposed of, and what basis that portion carried. None of that survives being reconstructed after the fact.

Evidence a disposition actually happened

Work orders, contractor invoices, capital-authorization requests, and demolition or construction records tying the retired component to a specific building and date. An improvement being capitalized does not, by itself, prove anything was retired.

Identification of the disposed asset and its placed-in-service date

Drawn from the taxpayer's own books and records wherever specific identification is practicable, with the basis for a FIFO or Modified FIFO fallback documented on the rare occasion it is genuinely needed instead.

The basis-sizing method and its inputs

Whichever reasonable method sized the disposed portion's basis, a Producer Price Index calculation, a pro rata allocation by replacement cost, or a component study, along with the depreciation schedule reducing that basis down to its adjusted figure at retirement.

Proof the return was timely and correctly reported the loss

Since no separate form exists, the filed return carrying the loss, and its filing date, is the only record that the election was actually made.

Whatever supports the section 469 usability determination

Passive income from other activities, active-participation and modified adjusted gross income figures for the section 469(i) allowance, real estate professional status records, or the facts behind a short-term rental's non-passive treatment, whichever the loss's usability actually rests on.

Where it goes wrong

This is not a listed or reportable transaction, and I do not treat it as aggressive. The exposure lives almost entirely in substantiation and timing.

The missed year

Missing the year is the single most common and least fixable failure here. A preparer who never asks whether anything was torn out and replaced has no occasion to spot a retirement worth electing, and because the election rides on a timely original return with no late-election route behind it, the miss is usually permanent once the return is filed. A standing question on every rental return, was anything torn out and replaced this year, catches this before the deadline closes.

The recurring mistakes

• Assuming a repair deduction settles the question. Whether the replacement is a repair or a capitalized improvement, and whether the retired component can be written off, are independent questions to check every time a component comes out. Expensing a new roof as a repair does not make the old roof's remaining basis disappear on its own.
• Chasing a loss that is not there. A component already depreciated to zero produces no loss, and a pre-1987 component sits outside the regulation entirely. Neither one can be fixed by identifying a different asset with basis left on it instead.
• Treating a full demolition like a component retirement. Once the structure itself comes down under section 280B, the basis and demolition costs go into the land, not into a current loss.
• Skipping the election and losing the removal cost too. Failing to elect does not just leave the component's basis stranded; it can also force the removal cost into the new component's capitalized basis instead of a current deduction.
• Assuming a casualty loss is optional. A hurricane-driven roof or HVAC loss triggers a mandatory partial disposition. Netting the old component's basis into an insurance claim without recognizing the disposition on the return misreports the year; it is not simply leaving money on the table.
• Promising a number before checking section 469. The loss this election produces is a deduction of the rental activity, not a freestanding write-off, and a long-term rental with no real estate professional status, no short-term-rental treatment, and no section 469(i) room simply suspends it. Retiring one component is not disposing of the taxpayer's entire interest in the activity, so it does not free up whatever else is already suspended.

A situation where this comes up

The version I see most often is an owner who has held a Florida rental for years, replaces the roof proactively before it fails, and treats the retirement as its own line item on that year's return. The old roof's adjusted basis is written off, the tear-off cost is deducted rather than capitalized, and because the owner qualifies for real estate professional status, the loss is usable the same year it is created. What changes is that the old component gets closed out instead of riding along inside the building's basis for another two decades.

The version that worries me starts with a named storm. The roof comes off in a hurricane, the insurance claim gets filed, and the old roof's remaining basis gets netted into that claim and forgotten rather than recognized as its own mandatory disposition on the return. Nobody intended to misreport anything; the casualty and the disposition just look like the same event, and by the time a preparer notices, the return has already been filed, with no general way back.

The third pattern is the owner who expenses a full HVAC replacement as a repair and assumes that settles the matter. It settles only the question of how the new equipment is treated. The old system's remaining basis is a separate question entirely, and it goes unclaimed for no better reason than that nobody asked it a second time.