The Corporate Filing Their Accountant Never Knew Existed

The situation

Eleni had spent the better part of two decades teaching at a Toronto university, and about eight years earlier, together with her partner Huong, a physiotherapist, and Eleni's sister Thalia, had set up a private corporation to hold a small portfolio of rental property. The plan was straightforward and common enough among professionals looking past their salaries toward retirement: the corporation bought four modest residential units across Toronto over several years, rented them out to long-term tenants, and used the rental income to slowly pay down the mortgages while building equity the three shareholders could eventually draw on. It was managed conservatively. Rent was collected, tenants stayed for years at a stretch, and the corporation's accountant filed a corporate income tax return every year reporting the rental income and claiming the usual deductions.

The corporation came to Treadstone Law for something unrelated to any of this — an update to its shareholder agreement to reflect Thalia's reduced involvement after she moved out of the city. During that engagement, as part of a standard review of the corporation's structure and holdings, a member of the team asked a routine question: did the corporation, as a private company that owned residential real estate, file an annual return under the federal Underused Housing Tax Act? The answer, after a pause, was no. Nobody had heard of it.

What the review found

The Underused Housing Tax Act is a federal law introduced in 2022, aimed originally at foreign owners who leave Canadian homes vacant. But the filing obligation it created reaches far beyond that target. The Act divides owners of residential property into two categories. An excluded owner — typically a Canadian citizen or permanent resident who owns property directly, in their own name — has no obligation under the Act at all and does not need to think about it. An affected owner has to file an annual return for every residential property they own by the following spring, even if they end up owing no tax whatsoever. Private corporations that own residential property are affected owners, full stop, regardless of who owns the corporation or where those people live. So are partners in certain partnerships and trustees of certain trusts.

The corporation's four Toronto rental units meant it was an affected owner for each property, for every year since the Act took effect. Because the units were rented to arm's-length tenants under long-term leases, the corporation likely qualified for an exemption from the tax itself — a 1% annual charge on a property's value that applies to owners who don't meet one of several carve-outs, including one for property genuinely leased out rather than left vacant. But qualifying for the exemption and being excused from filing are two different things. An affected owner has to file the return and claim the exemption on it every single year. Simply being entitled to an exemption, without ever filing the paperwork that claims it, provides no protection at all.

The penalty structure is what made this urgent rather than academic. A corporation that fails to file the required return for a property faces a minimum penalty of $10,000 for that property, for that year, regardless of whether any tax was ultimately owed once the return was filed. With four properties and returns outstanding for every year since the corporation's obligation began, the exposure was not one $10,000 penalty but a multiple of it — roughly $160,000 in potential minimum penalties alone if the CRA identified the corporation's unfiled history before it was corrected, on top of whatever discretionary additional penalty or interest might follow. Nobody at the corporation had been assessed anything yet. The obligation had simply gone unnoticed, sitting quietly in a statute the corporation's accountant had not connected to a residential rental portfolio held through a numbered company rather than in the shareholders' own names.

What we did

1. Confirmed the corporation's status as an affected owner for each property. We reviewed title for all four units and confirmed each was held in the corporation's name, triggering a separate filing obligation for each property for each year the corporation had owned it, going back to the Act's first year in force.
2. Assessed which exemption applied to each unit. Three of the four properties had been continuously leased to arm's-length tenants for periods long enough, in each relevant year, to qualify for the exemption available to genuinely rented residential property. The fourth had a gap of several months between tenants in one year while it underwent renovations, which needed closer analysis to confirm whether that year still qualified or whether a small tax liability might actually be owed for that property in that year.
3. Reconstructed the ownership and occupancy history property by property. Using lease agreements, rent rolls and renovation records the corporation had kept for its own accounting purposes, we built the factual record each return would need — the dates ownership began, the tenancy periods, and the gap in coverage on the fourth unit — well before facing any question from the CRA about it.
4. Prepared and filed the outstanding returns for all four properties, for every year owed. Working with the corporation's accountant, we filed the returns as a voluntary, complete catch-up rather than piecemeal, claiming the exemption on the three continuously-leased units and calculating the modest tax owing on the fourth for the one year its exemption did not fully apply.
5. Set up an annual filing calendar going forward. To prevent the same gap from reopening, we built the UHT filing deadline into the corporation's standing annual compliance checklist alongside its corporate income tax return, with a reminder that any future change in tenancy — a vacancy, a sale, a change in use — could affect which exemption applies and needs to be reassessed each year rather than assumed to carry over automatically.
6. Reviewed the corporation's structure for any other affected-owner triggers. Because Thalia's reduced involvement was already prompting a shareholder agreement update, we also confirmed that the corporation's ownership changes did not themselves create a separate reporting event under the Act, and flagged that any future property acquired by the corporation would carry the same filing obligation from the year of purchase.

The outcome

Because the returns were filed voluntarily before the CRA had opened any inquiry into the corporation, no late-filing penalty applied to any of the four properties across any of the years covered. The exemption was accepted for the three continuously-leased units, and the corporation paid a modest tax amount, well under $10,000, for the single year the fourth unit's vacancy during renovations meant it did not qualify for the full year. The roughly $160,000 in potential minimum penalties the corporation had been quietly exposed to never materialized, because the filings were made before there was anything for the CRA to catch.

The shareholder agreement update proceeded on its own track and closed without complication. The more lasting change was procedural: the corporation now files its Underused Housing Tax return every year as a routine part of its annual compliance, alongside its corporate income tax filing, rather than as an obligation nobody on the file had ever been told about. Eleni and Huong, for their part, came away from the engagement understanding something they had not appreciated when they set the corporation up — that holding investment property through a corporation, rather than personally, changes which federal filing regimes apply, sometimes in ways that have nothing to do with income tax at all.

What you can learn from this