Build the evidence for a building-component partial disposition review

Replacing a roof or building system raises a question about the old component as well as the new construction cost. Ask the tax adviser whether the removed portion warrants a partial-disposition review before the return is finalized. A contractor's replacement invoice does not automatically identify the remaining tax basis of what was removed.

Collect the building's acquisition and placed-in-service records, later improvements, construction scope, removal dates and evidence of the old component's retirement. Distinguish a complete replacement from an overlay, repair or addition that leaves the old component in service. Photos and contractor descriptions can help establish what actually happened.

The disposition regulation defines the relevant asset using its own rules. It explains that the unit-of-property analysis used for repair-versus-improvement decisions does not determine the disposition asset. Give the adviser both analyses instead of assuming a conclusion about the new expenditure answers the old component's treatment.

Search original construction schedules, purchase allocations, earlier cost studies and improvement records for the disposed component's cost. Identify whether the component was part of the original building or a later separately placed-in-service improvement. Preserve the original evidence and flag any allocations that were prepared for a different purpose.

Where the records cannot practicably establish the disposed portion's unadjusted depreciable basis, the regulation permits a reasonable method subject to its conditions. That is not permission to use today's replacement invoice as the old basis without analysis. Have the adviser document the chosen method, inputs and why they fit the circumstances.

If an estimate uses replacement cost, identify changes in capacity, materials, scope and price levels. A larger or upgraded system may not represent the same property as the retired component. Keep the supporting calculation reproducible, including any specialist report, index and allocation assumptions the adviser accepts.

The regulation treats certain partial dispositions, including specified casualty events and sales, differently from other transactions where an election is needed. Ask the adviser which rule applies to the actual event. Do not assume every component replacement automatically creates a deductible loss or requires the same election procedure.

For the ordinary partial-disposition election, the regulation generally ties the deadline to the original federal return's due date, including extensions, for the disposal year, subject to stated exceptions. Raise the issue before that return is filed. If it was missed, obtain advice on the available procedure instead of silently changing a later asset schedule.

Have the preparer document how the election is made, the resulting gain or loss and the depreciation adjustment. Preserve the affected tax return schedules and any necessary reporting. A note in the construction folder saying 'write off old roof' does not establish that the tax return implemented the reviewed decision.

Reconcile the disposed component's basis and accumulated depreciation to the remaining asset schedule. Check that the original building has not retained amounts removed through the approved disposition. Separately establish the new improvement's supported cost and placed-in-service date under the preparer's treatment.

For a hypothetical original component basis of $30,000 with $18,000 of associated depreciation, the unrecovered difference is $12,000 before considering the applicable disposition rules and other facts. The arithmetic illustrates the history required; it is not a determination that a $12,000 deduction is available.

Keep the removal evidence, basis method, election decision and revised schedules together. Flag later replacements of portions of the same asset because the regulation contains consistency requirements for reasonable basis methods. The next project reviewer should be able to see both what was already removed and how its tax basis was established.