Ontario landlords: the January 1 deadline is October 3
The N1 notice: how a January 1 rent increase has to be served.
An Ontario rent increase isn't valid because your landlord decided on a number. It needs at least 90 days' written notice on the Board-approved form — which means for an increase taking effect January 1, the N1 has to be in your hands by October 3. Miss any part of that and the increase can't take effect.
The deadline: October 3 for a January 1 increase
The Act requires at least 90 days' written notice before a rent increase takes effect. Ninety days back from January 1 lands on October 3 (October 4 through 31 is 28 days, all of November is 30, all of December is 31, plus the first day of January — 90 in total). So an N1 served on October 4 or later is too late for a January 1 increase, full stop.
RTA s.116
It has to be the N1 (or N2) — not a text message
Notice must be in the Board-approved form: the N1 for rent-controlled units, the N2 for units exempt from rent regulation (post-November-2018 buildings). An email, a text saying "rent's going up in January," or a line in a lease renewal doesn't count — the increase it claims is not lawful rent.
RTA s.116
The amount must fit the 2027 guideline: 1.9%
An increase taking effect in 2027 is capped by the 2027 guideline of 1.9% for rent-controlled units — no Board approval, no higher number. The 12-month rule applies too: rent can only be increased once in any 12-month period, so a January 1 increase also requires no earlier increase after the previous January.
RTA s.119, s.120
A late or invalid N1 just moves the date — and you can keep paying the old rent
A missed deadline doesn't cancel the increase forever; it pushes it to the first date that satisfies the 90-day rule (still within the guideline cap and the 12-month rule). In the meantime, the old rent remains the lawful rent — you can keep paying it. If you already paid an unlawful increase, you can apply to the Landlord and Tenant Board on Form T1 for a rebate, within one year of the illegal collection.
RTA s.116, s.135(1), s.135(4)
Watch for the common failure modes
The N1s that fail usually fail in predictable ways: served late, the wrong form (N1 on an exempt unit or a homemade letter), an amount above the guideline, or a second increase inside 12 months. Each one makes the increase unenforceable as written — and each one is exactly the kind of thing the free analyzer checks on your own lease's rent terms.
RTA s.116, s.119, s.120
Got an N1? Check it against the rules above.
Upload your lease — the free analyzer reads the rent and increase terms and flags what may conflict with the Act, including increase math that doesn't match the guideline.
General information, not legal advice. Rules summarized from the Residential Tenancies Act (Ontario); individual situations vary. Community legal clinics (legalaid.on.ca) give free advice if you need it.