Partial asset dispositions: review the component you replaced

What a partial disposition addresses

A partial asset disposition concerns a portion of a depreciable asset that leaves service. When the applicable rules are met, the tax treatment can include recognizing the disposed portion’s remaining adjusted basis. A physical replacement alone does not establish the amount or the available filing treatment.

Keep the original asset and the new addition connected in the workpapers, with distinct identifiers. That makes it easier to reconcile which costs remain in service and which have been retired.

Reconstruct the old component, not just the new bill

A reviewer needs the original asset’s basis and depreciation history, plus evidence identifying the retired portion. Depending on the circumstances, the regulations permit reasonable methods for determining the disposed portion’s unadjusted basis. The method and supporting assumptions must fit the property facts.

Do not simply subtract today’s replacement invoice from the building account. New work can include different quantities, capacity, specifications or price levels. A supported allocation and depreciation calculation are separate tasks.

• Locate original acquisition or construction records.
• Identify prior cost segregation allocations and later additions.
• Record what was removed, when and why.
• Reconcile allocated cost, accumulated depreciation and any proceeds.

Put the disposition year on the review calendar

An elective partial disposition generally belongs on a timely filed original return, including extensions, for the disposition year. Some disposition events are mandatory, and special account rules can change the analysis.

A missed election is not automatically repaired through Form 3115. Ask the preparer to identify the applicable procedural route before promising a historical write-off. Preserve the filing history and any relevant elections.

An example of the records conversation

Ask for equipment lists, serial numbers, removal photos, the contractor’s scope and the original building schedule. If those records conflict, resolve the difference before updating the tax schedule. Also review the replacement expenditure under the improvement rules; the two conclusions need to be coordinated.