Ottawa's vacant unit tax: the 2026 deadline was Canada Day

The deadline nobody circles

Ottawa's Vacant Unit Tax gets attention once a year, in March, when the declaration is due. That is the wrong month to think about it. By March the outcome is already decided. What sets your bill is the calendar, and for the 2026 occupancy year the calendar closed on Canada Day.

Here is the rule. The City taxes a residential property that was unoccupied for more than 184 days in the previous calendar year. Flip it around and you need the unit occupied for at least 184 days to be clear. Count 184 days back from December 31 and you land on July 1.

So if you own an Ottawa rental that has been sitting empty since January and it is still empty this morning, the 2026 occupancy year is gone. Filling it in August gets you 153 days. The by-law wants 184. The charge lands on your final tax bill in June 2027 and nothing between now and then changes it.

I write this in the last week of July because this is the week owners start telling me they will deal with the vacant unit "in the fall."

What it actually costs

The tax is one per cent of the property's assessed value for the first year of vacancy. Council added a graduated rate starting with the 2024 vacancy year: each additional consecutive vacant year adds another point, to a maximum of five per cent. One year of occupancy resets you back to one.

Two things people get wrong about that number.

First, assessed value is not market value. Ontario is still assessing on January 1, 2016 values because the province has postponed the province-wide reassessment repeatedly, and the 2026 tax year is still running off the 2016 roll. Your $800,000 Alta Vista semi might be assessed closer to $500,000. One per cent of that is $5,000, not $8,000.

Second, $5,000 is still $5,000, and if the unit sits empty again next year it becomes $10,000. The graduated rate exists precisely because 2,067 Ottawa properties stayed vacant two years running under the flat one per cent. Council decided a flat 1% was too cheap to change anyone's behaviour. They were right.

The tax applies only to residential properties of six units or less, and on a small multi it is prorated by the number of vacant units.

The traps that actually catch people

Not declaring at all. If you do not file, the property is deemed vacant and charged. Late declarations are accepted until April 30 with a $250 fee. Miss that and the charge goes on the roll whether the unit was occupied or not, and now you are appealing instead of declaring. This is the most common way owners end up paying.

The 30-day rule. "Tenanted" means occupied by tenants in increments of at least 30 days. Two weeks here, ten days there does not count toward your 184 even if the place was full all summer. Run furnished short stays and you are accumulating vacant days on the City's ledger while you collect rent. That sits on top of the short-term rental by-law problem most of those properties already have.

Renovating without a permit. The construction exemption requires issued building permits and a project genuinely large enough that the unit cannot be occupied for 184 days. Minor work does not qualify. One City audit campaign found 107 owners claiming the renovation exemption with no valid permit or no meaningful progress. There is a narrower permit-free version, but only immediately after a unit goes vacant, only if it is back in use within twelve months, and only once per owner per unit.

Audits reaching back three years. The City can audit a declaration for up to three years. In the 2023 occupancy year it completed 7,053 audits and found 1,022 non-compliant. Audits alone produced $3.9 million of the $14.3 million the program collected that year. This is not an honour system.

Where the vacancies actually sit

The 2023 ward numbers are worth reading if you are shopping. Citywide, 4,140 units came back vacant, about 1.2 per cent of eligible stock. The distribution is nowhere near even. Rideau-Vanier ran 3.38 per cent and Somerset 3.34 per cent. Alta Vista was 2.33, Kitchissippi 1.92. At the other end, Kanata North was 0.43 per cent and Kanata South 0.47.

By property type, condos ran 1.7 per cent vacant against 0.7 for both detached and townhouses. Multi-unit properties of two to six units ran 4.7 per cent, by a wide margin the highest.

That last figure should get your attention if you own a small multi. It is the product most likely to have one unit sitting between tenants, half-renovated, or occupied by a relative in a way the owner never documented. The City also publishes the reminder that roughly 24 per cent of Ottawa properties are not an owner's principal residence for more than six months of the year, which is a larger investor and second-home footprint than most people assume.

What to do from here

If the unit is empty and 2026 is already lost, stop trying to salvage 2026 and protect 2027. Get a tenant in on a lease of at least 30 days, and get them in early enough next year that you clear 184 days with room to spare. If you are renovating, pull the permit even when you think you can skip it. The permit is the exemption.

If the unit is occupied, keep the lease, the rent ledger and a utility account in the tenant's name. That is the evidence an audit asks for.

And if you are underwriting a purchase on something that has been sitting, ask what the seller declared. A property carrying a second or third consecutive vacant year walks into a two or three per cent charge, and unpaid amounts form a lien on the property rather than following the seller out the door. There is a clean exemption for the year you buy, but only for a full transfer to an unrelated party, and only if you claim it.

The wider point is the one I made with the rent guideline math earlier this month. Returns on Ottawa rental property in 2026 are not being made on rent growth. They are being made by not leaking money. A vacant month costs you rent. A vacant year now costs rent plus a percentage of your assessment, and the percentage climbs.

Sitting on an empty unit, or holding a small multi and not sure what got declared for it? Send me the address and roughly how long it has been vacant and I will tell you what you are looking at before the bill does. 613-262-6545, or fil@613realtor.ca.