When this guide is useful
A property project includes drains serving buildings and exterior areas.
The distinction that matters
Document where water is collected and discharged and what each component serves. Site-related terminology alone does not establish the tax treatment of all costs.
A worked situation to investigate
An industrial property has roof drainage, parking area drains and new exterior stormwater work on a shared plan.
The example is illustrative. Begin with the underlying event and its source documents, then separate missing facts from disagreements about their treatment. Work through the checks below in the order that matches your file, rather than treating a completed checklist as a tax conclusion.
Build a traceable handoff
Identify the affected person, entity or property and the relevant period. Keep original evidence, corrections and the reviewer's written conclusion connected. If the facts change after review, preserve the earlier version and ask whether the change affects implementation.