Rental Property GST Rebate When You Built the Unit Yourself

You built a unit, or substantially renovated one, and now you plan to rent it to a tenant. You may have been told there is a GST/HST rebate for that, but the rules look very different from the ones that apply when someone buys a new rental unit from a builder.

This article explains in plain terms how the owner-built version works: why tax arises when you build for yourself, who counts as a builder, how the rebate is calculated, and when to apply. Your own numbers and dates matter a great deal, so an accountant or lawyer should confirm the details for your project.

Why a self-built rental creates a tax bill

Long-term residential leases are exempt supplies for GST/HST, and a residential landlord generally cannot claim input tax credits on GST/HST paid on housing that was bought or self-supplied. That means the tax cost of building a rental does not simply wash out later through credits.

The Excise Tax Act deals with owner-builders through a deemed sale. A builder of a single-unit residential complex or a condo unit is treated as having made a taxable sale and a taxable purchase of it. This applies when the builder gives someone possession or use under a lease for residential occupancy, or, if the builder is an individual, occupies the unit as a residence.

The tax is calculated on fair market value at the later of substantial completion and the time possession, use or occupancy begins.

Who counts as a builder, and how that differs from a buyer

For the rebate, a builder includes someone who builds, or hires someone to build, on land they own or lease. A person who built or substantially renovated rental housing and reported a self-supply can claim the rebate, as long as the self-supply was reported on a GST/HST return and all net tax on that return was remitted.

A purchaser is different. A purchaser from a builder is a person who paid GST/HST on the purchase. An owner-builder's tax, by contrast, arises through the self-supply reporting process.

When the self-supply happens

The timing rule matters because it sets both the value used for tax and your filing deadline. The self-supply date is the later of substantial completion and when possession or use is given. For an individual builder, the self-supply can also occur when the builder occupies the unit as a residence.

The CRA guide gives a simple example: a unit completed on June 15, 2025, with possession given on July 1, 2025, has a July 1 self-supply. Whether a renovation is substantial enough, and exactly when a unit is substantially complete, depends on the facts of your project.

How the rebate amount is worked out

There are three pieces to keep apart. First, the federal rebate under the Excise Tax Act is A x ($450,000 minus B) / $100,000. A is the lesser of $6,300 and 36% of the GST/HST payable. B is the greater of $350,000 and the unit's fair market value. The rebate phases out between $350,000 and $450,000 and is nil at $450,000 or more.

Second, the CRA guide states the Ontario rebate as 75% of the provincial tax, to a maximum of $24,000. It is available regardless of fair market value, subject to that maximum.

Third, purpose-built rental housing has a different federal rebate: the total tax multiplied by the unit's share of floor space, with no $6,300 cap or phase-out. Construction or the last substantial renovation must begin after September 13, 2023 but before 2031, and be substantially completed before 2036. If your project fits that window, the capped rebate may not be the one that applies, so it is worth having the choice reviewed.

• Fair market value is set per unit, and the CRA may ask for a professional appraisal.
• A high-value unit can lose the federal rebate entirely, while the Ontario portion is not tied to value.
• Rules for purpose-built rental housing are separate from the capped rebate.

Deadlines, forms and next steps

The rebate application is due within two years after the end of the month in which the self-supply occurred (for a builder) or tax first became payable (for a purchaser). The main form is GST524, with GST525 for co-op and multiple-unit cases. Missing the deadline can cost you the rebate, so note the date early.

• Write down the date of substantial completion and the date a tenant or you first took possession.
• Confirm that the self-supply was reported on a GST/HST return and that all net tax on that return was remitted.
• Get a fair market value figure for each unit, and ask whether an appraisal is wise.
• Check whether your project start and completion dates fit the purpose-built rental window.
• Calendar the two-year application deadline and gather the construction records.
• Ask an accountant or lawyer to confirm which rebate applies before you file.

Frequently asked questions