Underused Housing Tax in Ontario: Do You Need to File?

The Underused Housing Tax (UHT) is a federal annual tax that has caught many Ontario property owners off guard — not because they owe money, but because they did not realize they had to file a return in the first place. Since the Canada Revenue Agency introduced the Underused Housing Tax Act, the rules have been revised more than once, and the CRA has issued updated guidance each year. If you own residential property in Ontario, even indirectly through a corporation, trust, or partnership, it is worth understanding whether the UHT affects you before the annual deadline arrives.

This article explains the basics: what the tax is, who must file, who actually pays, what exemptions exist, and what happens if you miss the deadline. Because the rules are still evolving, always confirm the current requirements with the CRA or a qualified tax professional. For the actual filing, we recommend working with a CPA or tax accountant.

What Is the Underused Housing Tax?

The UHT is a federal annual tax on certain residential properties in Canada that are considered "underused" — that is, vacant or not meaningfully occupied. The policy goal is to encourage housing availability by discouraging foreign owners from leaving properties empty.

The tax is calculated as a percentage of the property's assessed value (or in some cases its taxable value as determined under the applicable provincial rules). We are deliberately not quoting the specific rate here because it must be confirmed with the CRA for the tax year in question — rates and thresholds have been subject to legislative change, and what applied in a prior year may not apply today.

The Underused Housing Tax Act applies across Canada, but Ontario is particularly affected given the concentration of residential real estate held by corporations, trusts, and non-resident individuals in the Greater Toronto Area and other major urban centres.

Who Must File a UHT Return?

This is the most misunderstood part of the UHT regime. Filing an annual UHT return and paying the UHT are two separate obligations. Many owners who owe no tax still have to file.

Excluded Owners (Generally No Filing Required)

An "excluded owner" is not required to file a UHT return. Excluded owners include:

• Canadian citizens and permanent residents who own residential property in their own name (directly, not through a corporation, trust, or partnership)
• Canadian publicly traded corporations
• Registered charities and co-operative housing corporations
• Certain Indigenous governing bodies and their wholly owned corporations

If you are a Canadian citizen or permanent resident and you hold title to your Ontario home personally, you are almost certainly an excluded owner and do not need to file.

Affected Owners (Must File — and May or May Not Owe Tax)

An "affected owner" must file a UHT return every year, even if the result is a nil return. Affected owners include:

• Canadian citizens or permanent residents who own through a corporation, trust, or partnership — the structure matters, not just your immigration status
• Non-Canadian individuals (foreign nationals who are not Canadian citizens or permanent residents)
• Canadian private corporations
• Partners of a partnership that owns residential property
• Trustees of a trust that owns residential property

This catches a surprisingly broad group of Ontario property owners. If a family holds a vacation property through a family trust, or a professional holds investment real estate through a holding company, UHT filing obligations likely apply — even if no tax is ultimately owed.

Who Actually Pays the Tax?

Owing the UHT is a separate question from being required to file. An affected owner who qualifies for an exemption pays no tax — but still files. Tax is generally owed by non-Canadian owners whose Ontario residential property is not covered by an exemption.

Canadian owners caught in the "affected owner" net (for example, because they hold property through a private corporation) are often exempt, but they must still file to claim that exemption.

Key Exemptions

The Underused Housing Tax Act provides a number of exemptions that can reduce the tax to zero. The main categories include:

• Primary residence exemption: The property is used as the owner's (or certain family members') primary place of residence for the year.
• Qualifying occupancy exemption: The property is occupied by an arm's-length tenant under a written agreement for a required minimum period, or is occupied by certain family members.
• Qualifying rental exemption: The property meets the CRA's criteria for qualifying rental use, including minimum occupancy thresholds. Confirm the current thresholds with the CRA — they have been adjusted since the tax was introduced.
• New owner exemption: The property was acquired during the calendar year in certain circumstances.
• Location-based exemption: Certain properties located in rural areas or smaller communities (based on population density criteria) may be eligible. Ontario has many properties in regions that qualify, but the eligible location rules are detailed and must be confirmed on a property-by-property basis.

Always verify which exemptions apply to your specific property and ownership structure with a tax professional, because claiming an incorrect exemption — or missing the filing deadline while assuming you qualify — can result in penalties.

Annual Deadline and Penalties for Not Filing

The UHT return for a calendar year is generally due in the spring of the following year. The exact deadline has shifted since the UHT was introduced, so confirm the current due date each year on the CRA website.

The penalties for missing the filing deadline are significant. Even if no tax is owed, failing to file on time can result in a minimum penalty that is substantial relative to the time cost of filing. For properties where tax is owed, late-filing penalties are higher. These are not small administrative fees — the UHT penalty regime was designed to compel compliance.

Estate and Succession Situations

The UHT creates complications in estate administration. If a deceased Ontario resident owned residential property through a trust or held it in a manner that makes the estate an affected owner, the estate may have UHT filing obligations even while probate is ongoing. Executors and estate trustees should factor UHT compliance into the administration timeline. This is an area where the interaction between Ontario estate law and federal tax obligations benefits from co-ordinated advice from both a lawyer and a tax accountant.

Frequently asked questions