Ontario rent increase 2026: how to calculate the guideline and serve Form N1

Ontario set the 2026 rent increase guideline at 2.1%. For most rent-controlled units, that is the ceiling you can raise rent in a year without Landlord and Tenant Board approval.

Landlords still lose increases because the notice is short, the form is wrong, the math is off, or the unit is not where they think it is on rent control. This guide walks through the calculation, Form N1, and a short checklist before you serve.

This is practical process guidance, not legal advice. Edge cases need a licensed paralegal or lawyer.

What the 2026 guideline means

The province publishes a yearly guideline based on Ontario Consumer Price Index data, capped by statute at 2.5%. For increases that take effect in 2026, the guideline is 2.1%.

Example: lawful rent is $2,000 per month. A 2.1% increase is $42. New rent is $2,042, if every other rule is met.

Use the guideline for the year the increase takes effect, not the year you print the notice. An N1 served late in 2026 for a January 2027 effective date follows the 2027 guideline once the province has set it.

Official source: Residential rent increases on ontario.ca.

Who the guideline covers

The guideline covers most private residential units under the Residential Tenancies Act. Many units first occupied for residential purposes on or after November 15, 2018 are exempt from the guideline cap. Exempt units still need proper written notice. The usual form for those increases is N2, not N1.

If you are unsure whether the unit is exempt, check the occupancy history and get advice before you pick a percentage.

The four rules that kill a bad increase

Twelve months between increases. You generally cannot raise rent until 12 months after the tenancy started or 12 months after the last increase took effect.

At least 90 days' written notice. The effective date on the notice must be at least 90 days after you give the notice. Eighty-nine days is not close enough. It fails.

Effective date on the right day. The increase must take effect on the first day of a rental period. For monthly rent due on the first, that means the first of a month.

Proper form. For a guideline increase on a rent-controlled unit, use the current Form N1 from Tribunals Ontario. A text, a casual email, or a letter on your letterhead is not the form the Act expects.

Above-guideline increases need a Board process. Do not write a larger percentage onto an N1 and hope.

How to fill Form N1 without shooting yourself

Download the current N1 PDF. Fill:

1. Tenant legal names as on the lease
2. Rental unit address and unit ID
3. Current lawful rent
4. New rent amount
5. Effective date that clears the 90-day and 12-month rules
6. Your signature and the date you sign

Double-check the arithmetic. 2.1% of $1,850 is not "about $40." Round in a way you can defend from your ledger.

Service still matters

Serve the N1 with a method the Act accepts. Email only works with written consent to email service already on file. Keep proof of service with the signed N1.

Related reading: Consent to service by email under Ontario's RTA and N4 notice common mistakes.

Pre-serve checklist

1. Confirm whether the unit is rent-controlled or guideline-exempt.
2. Confirm 12 months have passed since move-in or the last increase effective date.
3. Calculate new rent at or below 2.1% for a 2026 effective date on a controlled unit.
4. Pick an effective date on the first day of a rental period at least 90 days out.
5. Download the current N1 or N2 PDF from Tribunals Ontario.
6. Match names and address to the Ontario Standard Lease.
7. Serve with a valid method and file the proof next to the notice.
8. Update your rent ledger on the effective date, not before.

Reduce transcription errors

Most failed increases are clerical. Wrong day count, wrong form, wrong rent figure. Tools built for Ontario paperwork reduce copy-paste mistakes when you generate notices from tenant records. Join the Ontario Landlord iOS waitlist if you want that workflow on your phone.

Bottom line

For 2026, 2.1% is the usual ceiling on rent-controlled units. The increase only sticks if the timing, the form, the math, and the service are clean. Run the checklist once before you serve. Fixing a void increase costs more than slowing down for ten minutes.