How to Legally Raise Rent in Ontario (2026 Landlord Guide)

Raising the rent sounds simple until you realize how many ways it can go wrong. In Ontario, a rent increase that skips a single step — wrong form, wrong notice period, wrong timing — is not enforceable, and the tenant is fully within their rights to keep paying the old amount. Here is how to do it correctly under the Residential Tenancies Act in 2026.

Know the annual guideline before you do anything else

For most rentals in Ontario, the amount you can raise the rent each year is capped by the provincial rent increase guideline. For 2026, that guideline is 2.1%. If the rent is $2,000 a month, a guideline increase brings it to $2,042 — not a dollar more, unless you have an approved above-guideline increase (more on that below).

The guideline applies to most units first occupied on or before November 15, 2018. Units first occupied after that date are currently exempt from the guideline cap, meaning the landlord can set the increase amount — but the rest of the rules on notice and timing still apply. We break the 2026 number down in detail in our post on the Ontario rent increase guideline for 2026.

The three rules that make an increase legal

Every lawful rent increase in Ontario has to clear three tests. Miss one and the increase is void.

1. Twelve months since the last increase

You can only raise the rent once every 12 months. That clock starts from the date of the last increase, or from the date the tenant first moved in if you have never raised it. Not 12 months from the lease anniversary, not from the calendar year — 12 months from the last actual increase.

2. Ninety days of written notice

The tenant must receive at least 90 days of written notice before the increase takes effect. If you want the new rent to start August 1, the notice has to be in the tenant’s hands by May 3 at the latest. Give yourself a buffer; do not cut it to the day.

3. The correct form — Form N1

A text message, an email, or a note taped to the door does not count, even if the tenant agrees. You have to use the Landlord and Tenant Board’s official Form N1, Notice of Rent Increase. The form states the current rent, the new rent, and the date the increase takes effect. Fill it out completely; a form missing the effective date has been thrown out before.

Delivering the notice properly

How you serve the N1 matters as much as when. Acceptable methods include handing it to the tenant directly, placing it in their mailbox, or sliding it under the door. If you mail it through Canada Post, the RTA adds five days for delivery, so count backward from your effective date and add that mailing buffer on top of the 90 days.

Keep a copy of the signed form and a record of how and when you served it. If the increase is ever disputed, the burden is on you to show the notice was valid and delivered on time.

When you can raise rent above the guideline

The 2.1% cap is not absolute. There are a few legitimate routes above it:

• Above-Guideline Increase (AGI): If you have completed major capital work — a new roof, new windows, a boiler replacement — or your municipal taxes or utility costs have jumped sharply, you can apply to the Landlord and Tenant Board for an AGI. You have to file an application with supporting invoices, and the tenant has the right to dispute it. Approved AGIs are often phased in over more than one year.
• Newer units: As noted, units first occupied after November 15, 2018 are exempt from the guideline. You still owe 90 days notice on Form N1 and can still only raise once every 12 months.
• Agreed increases for services: If you and the tenant agree in writing to add a service such as a parking spot or an extra appliance, a separate increase can apply, using Form N10.

What you cannot do is raise the rent above guideline simply because the market moved or your mortgage renewed at a higher rate. Those are real pressures, but they are not grounds for an AGI.

Common mistakes that cost landlords money

The errors we see most often are small and entirely avoidable: raising rent 11 months after the last increase instead of 12, giving 60 days notice because that is the number people remember from lease-ending rules, using an old version of Form N1, or rounding the increase up to a clean number. If your $1,900 rent should go to $1,939.90 at 2.1%, you cannot round to $1,950 — the extra $10 makes the whole increase illegal.

Another quiet trap: assuming a vacancy resets everything. When a tenant leaves and a new one moves in, you can set the starting rent at whatever the market bears — that part is true. But the moment the new tenant is in place, the 12-month clock and the guideline cap apply to them from that day forward.

What happens if you get it wrong

An improper increase is not a minor slip. The tenant can simply keep paying the old rent, and if they have already paid the higher amount, they can apply to the LTB to recover the overpayment — going back up to 12 months. You do not get to quietly fix it and move on. And if the matter reaches a hearing, expect delays; our breakdown of the LTB hearing timeline in 2026 shows why you do not want to end up there over an avoidable paperwork error.

A simple checklist before you serve the notice

• Has it been at least 12 months since the last increase or move-in?
• Is the increase at or below 2.1% (or do you have an approved AGI or an exempt unit)?
• Are you giving at least 90 days notice, plus mailing time if posted?
• Are you using the current Form N1 with every field completed?
• Do you have a record of how and when you served it?

Answer yes to all five and your increase will hold up. Miss one and it will not.

Frequently asked questions

Can I raise the rent more than once in a year if the first increase was small?
No. Once every 12 months, regardless of how small the previous increase was.

Does the tenant have to sign the N1 for it to be valid?
No. The tenant’s signature is not required. What matters is that the correct form was properly completed and served with 90 days notice.

What if my tenant is on a fixed-term lease?
The same rules apply. You still need 12 months between increases, 90 days notice, and Form N1 — the lease term does not override the RTA.