What is the HST self-supply rule for landlords and builders in Ontario?

The self-supply rule is an HST provision that applies when a builder or developer constructs or substantially renovates a residential property and then uses it for purposes other than selling it — for example, moving in personally or converting it to a long-term rental. In these cases, the builder is deemed to have sold the property to themselves at fair market value, and HST is deemed to have been collected on that deemed sale, even though no actual sale took place.

This rule exists because residential rent is exempt from HST. Without the self-supply rule, a builder who claims ITCs on all construction costs (and recovers HST on inputs) and then converts the property to a rental would benefit from ITCs without ever paying the corresponding output tax. The self-supply rule forces the HST settlement.

The deemed HST must be reported on the builder's HST return in the reporting period when the property is first occupied. The fair market value of the property at that time — determined by appraisal if necessary — is the base for the tax calculation. Builders who run into this rule and are unprepared for the cash outflow face significant challenges. Getting tax advice at the planning stage of any residential construction project is essential.