Is a property that is still under construction exempt from the Underused Housing Tax?
Generally, yes - a residential property that has not yet reached the point the rules consider "substantially completed" is treated as outside the scope of a tax that is specifically aimed at completed residential housing, since the whole premise of the Underused Housing Tax is about housing sitting vacant or underused once it is actually usable as housing. A construction project that is still genuinely underway is not the kind of situation this tax was designed to capture.
The precise point at which a property crosses over into being considered substantially complete for this specific purpose is a technical, federally defined threshold, and it does not necessarily line up exactly with a builder's own internal completion date, an occupancy permit, or a buyer's closing date on a pre-construction purchase. Because getting this timing wrong could mean either missing a filing that was actually required or unnecessarily worrying about a return that was not, it deserves specific confirmation rather than a general assumption either way.
If you own an affected-owner interest in a property still under construction, confirm the specific completion timing rules with a tax advisor rather than assuming the exemption automatically applies for the entire construction period.
Key takeaways
- A property not yet substantially complete is generally outside this tax's scope for that period.
- The tax targets completed housing, consistent with excluding genuine construction-stage properties.
- The "substantially complete" threshold is a specific, technical point, not an obvious completion date.
- Confirm the specific timing rules with a tax advisor rather than assuming automatic exemption.