The Underused Housing Tax (UHT) has been in force since 2022, yet confusion persists among property owners—especially foreign nationals and corporations—about who must file, when exemptions apply, and what penalties look like. As of 2026, the CRA has begun ramping up enforcement with notices of assessment hitting owners who thought they were exempt or simply didn't know the filing requirement existed. Agents who understand the mechanics can prevent client disasters and position themselves as indispensable advisors on compliance matters that directly affect property marketability and closing timelines.

This article breaks down the UHT's current state, clarifies the filing obligation even when no tax is owed, identifies common exemption pitfalls, and outlines what agents should communicate at listing, offer, and closing stages.

Who Files and When Tax Is Actually Owed

The UHT is a 1% annual tax on the ownership value of vacant or underused residential property in Canada. It applies to non-Canadians and non-permanent residents, plus certain Canadian corporations and trustees. The critical distinction: filing is mandatory even if the property qualifies for an exemption and no tax is due. The deadline is April 30 of the year following the calendar year in question. Miss that date, and the minimum penalty is $5,000 for an individual, $10,000 for a corporation.

Affected owners include:

Non-resident non-citizens who own residential property directly or through certain partnerships.
Canadian corporations (other than public corporations or registered charities) that are not primarily engaged in the business of real estate development or rental.
Trustees of trusts where any beneficiary is a non-resident or the trust itself is non-resident.
Certain partnerships with non-resident or corporate partners.

The 1% tax is calculated on the property's assessed value for property tax purposes. In Ontario, that's the MPAC assessment; in BC, it's BC Assessment. If the property was vacant or underused for more than 180 days in the calendar year and no exemption applies, the owner pays. But again, even if an exemption applies—principal residence, long-term rental, renovation, etc.—the owner must file Form UHT-2900 to claim it.

Common Exemptions and Where Owners Stumble

Most residential properties held by Canadians and PRs are exempt because they're principal residences or occupied by qualifying individuals. The problem arises with foreign buyers, numbered companies holding pre-construction condos, and estates in probate.

Key exemptions include:

Principal residence: The owner or their spouse/common-law partner ordinarily inhabited the property. This does not require 183 days of occupancy—ordinary inhabitation is a facts-and-circumstances test, but the CRA expects regular, recurring use.
Qualifying occupancy: The property was occupied at least 180 days by a qualifying individual (Canadian citizen, PR, or certain visa holders) under a written lease of at least one month.
Renovation or construction: Uninhabitable due to renovation or new construction, provided the owner took reasonable steps to complete the work.
Death of owner: The property was vacant because the owner died in the year or the prior year.
Court order or involuntary conversion: Property transfer due to divorce, bankruptcy, or similar.

Where owners stumble: failing to document occupancy with written leases, assuming a property rented for 120 days qualifies (it doesn't—180 is the threshold), or believing that because they're a PR, no filing is required. PRs are generally exempt, but if they hold property through a corporation or trust, that entity may still need to file. Another trap: a Canadian who becomes a non-resident mid-year. The UHT applies on a calendar-year basis, so residency status on December 31 determines liability for that year.

Enforcement Trends and Penalty Relief

The CRA issued its first wave of compliance letters in late 2023 and early 2024. By mid-2026, assessments for the 2022 and 2023 tax years are landing. Penalties for late filing start at $5,000 per individual owner, $10,000 per corporation. If the return is more than 30 days late, an additional $500 per month applies, up to $5,000. If tax is actually owing and not paid, interest compounds daily at the prescribed rate (currently around 10% annually).

The CRA has published guidance on voluntary disclosure and penalty relief. Owners who file late but before receiving a compliance letter may request relief under the taxpayer relief provisions, citing reasonable cause—illness, misunderstanding of the law, reliance on incorrect professional advice. Relief is not automatic. The CRA expects a narrative explanation and supporting documents. Agents should flag this option immediately when a client discovers a missed filing, and refer them to a tax accountant or lawyer experienced in CRA disputes.

One enforcement quirk: the CRA cross-references land registry data with tax filings. If a property is registered to a foreign national or a numbered company and no UHT return appears, expect a letter. This makes pre-listing due diligence critical. A property with an outstanding UHT liability or unfiled return can delay closing or spook buyers who fear assuming the seller's problem.

What Agents Should Communicate at Each Stage

At the listing appointment, ask: Is the owner a Canadian citizen or PR? If not, or if the property is held in a corporation or trust, flag the UHT filing requirement. Even if the property was rented or owner-occupied and no tax is owed, the return must be filed. Recommend the seller confirm compliance before listing. If they haven't filed for prior years, get them to a tax professional now—cleaning this up before a deal firms up avoids last-minute chaos.

During the offer stage, buyers' lawyers increasingly ask for proof of UHT filing as part of due diligence. If the seller is a foreign national or corporate entity, include in the listing notes that UHT filings are current or will be completed before closing. This preempts buyer concerns and signals professionalism. If a buyer is a non-resident or plans to hold title in a corporation, brief them on the annual filing obligation. It's not just a one-time cost—it's an ongoing compliance burden.

At closing, ensure the statement of adjustments reflects any outstanding UHT liability. If the seller failed to file and the CRA assesses after closing, the liability stays with the seller, but the property's title could be encumbered by a lien. Title insurance may not cover UHT penalties. Confirm with the lawyer that the seller has either filed or will file before funds are released. If the buyer is assuming the property subject to an exemption (e.g., they plan to occupy it as a principal residence), document that intention in writing for their future filing.

Practical Next Steps

Add a UHT checklist to your intake forms for listings and buyer clients. Train your team to identify high-risk profiles: foreign nationals, numbered companies, estates, properties vacant more than six months. Partner with a tax accountant who understands UHT and can turn around filings quickly. When a client balks at the $5,000 penalty for a missed filing, remind them that ignoring it invites a $10,000 assessment plus interest if the CRA moves first. Positioning yourself as the agent who prevents expensive surprises builds loyalty and referrals in a market where regulatory complexity is the new normal.