The Wrong Rebate on a New Fourplex Cost Them, Then Saved Them

The situation

Reza worked as a pharmacist and Valentina managed construction projects for a mid-sized builder. On the side, they had spent two years building a small four-unit stacked townhouse property in Orleans, acting as their own developer on land they had purchased outright. Valentina's day job gave her a good sense of scheduling trades and managing a construction budget, and the couple leaned on that experience to keep the build on track through permitting, framing, and finishing. The plan from the start was to rent out all four units and hold the building as a long-term investment alongside their day jobs, not to sell any of them or move into one themselves.

When the building reached completion and tenants began moving in over the following few months, their accountant filed a GST/HST new housing rebate application on their behalf, worth roughly $24,000. It was the rebate available to someone who builds or substantially renovates a home and then lives in it themselves, or gives it to a close relative to live in. Reza and Valentina had never lived in any of the four units, and no relative had either. They had built the property to rent it, full stop, and the rebate that landed on their return did not match what they had actually done with the building.

What the review found

About eighteen months later, the Canada Revenue Agency opened a review of the rebate claim. The review quickly turned into something larger. Under the Excise Tax Act, a person who builds new residential property for the purpose of renting it out is treated, for GST/HST purposes, as having sold the property to themselves the moment it is substantially complete and first occupied by a tenant. This is often called the self-supply rule. The builder has to self-assess and remit tax on the fair market value of the property at that point, even though no actual sale to an outside buyer ever happens.

Reza and Valentina had never made that self-assessment. Their accountant had filed the wrong rebate application entirely — the owner-occupier rebate, which simply did not apply to a building that was rented out from day one — and had not addressed the self-supply obligation at all. The CRA's reassessment therefore did two things at once: it disallowed the $24,000 owner-occupier rebate outright, and it assessed unremitted HST on the self-supply of the fourplex, calculated against an appraised fair market value of just over $1.7 million for the completed building. With interest accumulated over the review period, the total the CRA was asking Reza and Valentina to pay came to roughly $340,000.

The number was alarming, but it was not the full picture. A separate rebate exists for exactly this situation — a builder who rents out new residential units instead of occupying them. The New Residential Rental Property Rebate can offset a meaningful share of the self-supply tax, provided the builder can show that each unit was leased to a tenant for at least a year, or leased as their primary place of residence, and that the rebate application is filed correctly within the required time limit. No one had filed for it.

What we did

1. Confirmed the self-supply liability before contesting anything. The self-supply rule and the resulting HST assessment were correctly applied in principle — the building was a rental property from the outset, and the tax on its fair market value was genuinely owing. Disputing that starting point would have wasted time and credibility with the reviewer, so our team focused entirely on the rebate side, where the real recoverable value sat.
2. Gathered lease documentation unit by unit. The rental rebate has to be supported at the level of each individual unit, not the building as a whole. We collected the signed leases, rent rolls and move-in dates for all four units and reviewed each one against the rebate's requirements. Three units had straightforward one-year leases to tenants using the units as their home. The fourth had been rented through a series of short-term arrangements while Reza and Valentina tried to find a longer-term tenant, with no lease running past four months at a time.
3. Filed the New Residential Rental Property Rebate application for the three qualifying units. Filing outside the normal window after a reassessment has already started is not automatic — it requires making the case to the CRA that the application is complete, accurate and tied to a genuine rental use that existed at the relevant time. We prepared the application with the supporting leases and appraisal figures attached, rather than as a bare form, to reduce the chance of a second round of questions.
4. Was transparent about the fourth unit. There was no credible argument that a series of short-term tenancies met the rebate's minimum lease requirement, and pretending otherwise would have put the entire claim at risk. We told Reza and Valentina early that the fourth unit's rebate was very unlikely to survive, so they could plan around that cost rather than be surprised by it later.
5. Negotiated the interest component directly with the CRA. A large part of the original $340,000 figure was interest that had built up while the file sat in review, much of it during a period when the missing rental rebate application — not any dispute over the underlying tax — was the only outstanding issue. We asked the CRA to reduce the interest charged for that stretch, on the basis that the tax base itself was not seriously in question and the delay had been procedural rather than adversarial.

The outcome

The CRA accepted the rental rebate applications for three of the four units, which brought roughly $72,000 back against the original assessment. The fourth unit's rebate was formally denied, as expected, because none of its tenancies had reached the required one-year term. The CRA also agreed to reduce the accrued interest by adjusting the period it was calculated over, taking off close to $30,000.

Reza and Valentina also tightened their leasing approach on the fourth unit once they understood why it had fallen short. Instead of accepting whichever tenant was available on short notice, they held out for someone willing to sign a full one-year term, even at a slightly lower rent than a short-term arrangement might have brought in. It would not change the outcome on the rebate already denied, but it meant the unit's next tenancy would not create the same problem twice.

After the rebate credits and the interest adjustment, Reza and Valentina's final payment to the CRA came to roughly $238,000 — down from the original $340,000 assessment, but still a substantial sum, and still more than they would have owed if the rebate applications had been filed correctly from the start. They arranged a payment plan with the CRA to cover the balance over several months rather than paying it in one instalment, which the CRA agreed to given the building's steady rental income.

The building itself was never at risk. All four units stayed rented throughout the review, and the couple kept the property. The real cost of the original filing error was the roughly $100,000 gap between what a correctly filed rebate claim would have recovered and what they actually got back once the fourth unit's rebate fell away — money that, with better leases in place from the beginning, did not need to be lost at all.

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