A rent increase in Ontario is a paperwork deadline before it is a pricing decision. Two dates decide whether it holds: the date the increase takes effect, and the date the tenant receives written notice. Miss the gap between them and the increase is not late, it is gone for that cycle, because the twelve month clock keeps running whether you served notice or not.
This matters most to landlords with a handful of scattered units, where nobody owns the calendar. An owner with four houses and a basement suite finds out in October that the increase they meant to take in November needed notice in early August.
Step 1: Check whether the unit is covered by the guideline at all
Do this first, because it changes which form you use. The rent increase guideline applies to most private residential units under the Residential Tenancies Act, 2006, including rented houses, apartments, basement apartments, condos, mobile homes and land lease communities.
It does not apply to new buildings, additions to existing buildings, and most new basement apartments occupied for the first time for residential purposes after November 15, 2018. Community housing, long-term care homes and commercial properties are outside it too, and the guideline never applies on turnover, where you and the incoming tenant agree on the rent.
That November 2018 date is the one people get wrong. A legal basement suite finished in 2019 and first rented in 2020 is exempt from the guideline amount. The unit upstairs, rented since 2015, is not. Same building, two rules, two different forms.
Step 2: Confirm twelve months have passed
You can increase the rent if at least twelve months have passed since the date of the last increase, or since the date the tenancy began if there has not been one. There is one wrinkle worth knowing: if the previous tenant assigned the unit to the current tenant within the twelve months before the increase date, the clock runs from the previous tenant's last increase.
Write the anniversary date down somewhere you will see it. That single date is what everything else counts from.
Step 3: Pick the increase date, then count back 90 days
Notice must reach the tenant at least 90 days before the increase takes effect. Ninety days is not three months, so count it properly rather than eyeballing it.
Working from today, late July 2026:
- An increase effective November 1, 2026 needed notice by August 3, 2026.
- An increase effective December 1, 2026 needs notice by September 2, 2026.
- An increase effective January 1, 2027 needs notice by October 3, 2026.
- An increase effective February 1, 2027 needs notice by November 3, 2026.
Those are last possible days, not target days. Serve earlier. If you deliver by mail rather than by hand, notice is not treated as received the moment it leaves your hands, so build in a buffer instead of landing on the deadline.
Step 4: Use the guideline for the year the increase takes effect
This is the step that quietly costs people money, and it is about to catch a lot of landlords.
The guideline is tied to the year the increase takes effect, not the year you write the notice. Ontario has published both numbers already:
- 2026: 2.1%
- 2027: 1.9%
So a notice you sign this week for an increase effective December 1, 2026 uses 2.1%. The same notice, signed the same day, for an increase effective January 1, 2027 uses 1.9%. Two units, one afternoon of paperwork, two different percentages. Applying 2.1% to a January increase overcharges the tenant and hands them a valid dispute.
The guideline is calculated from the Ontario Consumer Price Index using June to May data, and it is capped at 2.5% regardless of what inflation does. Ontario publishes the figure and the full history back to 1991 on its residential rent increases page.
Step 5: Do the arithmetic, and round down
Multiply the current rent by the guideline, then add it. Rent of $1,850 with a 1.9% increase gives $35.15, for a new rent of $1,885.15.
Resist tidying that to $1,890. The guideline is a maximum, so anything above the calculated figure is an overcharge. An awkward number that is correct beats a round number that is not.
Step 6: Use the right form
Most increases use Form N1, Notice of Rent Increase. Three exceptions:
- Form N2 for units exempt from the rules limiting the increase amount, which is where that post-November 2018 suite lands.
- Form N3 for care homes, where the guideline covers the rent portion but not services like meals, nursing or cleaning.
- Form N10 where you and the tenant have agreed to an increase above the guideline tied to capital work or a new or additional service.
All of them are free from the Landlord and Tenant Board forms page. A letter you wrote yourself is not a substitute, no matter how clearly it is worded. The notice has to be in the proper form.
Step 7: Deliver it, and record how you delivered it
The N1 instructions list several ways to give the notice: hand it to the tenant or to an adult in the unit, leave it in the mailbox or wherever mail is normally delivered, or put it under the door or through the mail slot.
Whichever you use, write down the date, the method and who did it, on the day it happens. That note is the whole of your evidence. A tenant can dispute an improperly noticed or miscalculated increase at the Landlord and Tenant Board within twelve months after the amount was first charged, and by then nobody remembers which Tuesday the envelope went out.
If you are applying for an above-guideline increase
If you have applied for an above-guideline increase but the Board has not yet issued an order, the tenant can choose what to pay in the meantime: the increased amount on the notice, or the current rent plus the guideline increase. That is their choice, not yours, so plan the cash flow around the lower figure.
The version to keep
Confirm the unit is covered. Confirm twelve months have passed. Set the effective date. Count back 90 days. Take the guideline for the year the increase lands in. Calculate to the cent and round down. Use the right form. Deliver it and log it.
Eight steps, once a year, per unit. The whole thing takes twenty minutes and protects a year of rent.