Rent increase season trips up a surprising number of Ontario landlords every year — not because they miss the deadline, but because they use the wrong form, fill it out incorrectly, or serve it the wrong way. Any one of those mistakes can invalidate the entire notice. Your tenant doesn't have to pay the increased rent. And you have to start the 90-day clock all over again.
The N1 form exists to prevent exactly that problem. It's the standardized notice of rent increase issued by the Landlord and Tenant Board, and it's the only document that satisfies your legal obligation to give written notice under the Residential Tenancies Act. If you're raising rent — even by one dollar — this is the form you need.
This guide walks through every field on the N1, explains the rules behind it, and covers the mistakes that most commonly invalidate the notice.
What the N1 Form Is and When You Need It
The N1 is officially titled "Notice of Rent Increase." It's a one-page form published by Tribunals Ontario and available for free download from the LTB forms page.
You must use the N1 any time you're giving a tenant written notice of a rent increase for a residential tenancy governed by the Residential Tenancies Act. That means:
- Single-family homes
- Apartments in multi-unit buildings
- Basement apartments
- Semi-detached and townhouse rentals
- Secondary suites
You do not need an N1 for rent increases in a few limited situations — primarily if your unit is entirely exempt from rent control and you're setting a new rent for a new tenant. But for an existing tenant in any residential rental, the N1 is required.
The N1 is not filed with the LTB. You don't submit it anywhere. You complete it and serve it directly to your tenant. The LTB only sees it if there's a dispute afterward.
Understanding the Rent Control Rules Before You Fill Out the Form
Before you touch the N1, you need to understand whether your unit is subject to rent control — because it affects what increase you can give.
Rent control applies to units that were first occupied for residential purposes on or before November 15, 2018. For these units, your increase cannot exceed the annual rent increase guideline set by the province.
Rent control does not apply to units first occupied for residential purposes after November 15, 2018 — new builds, new basement apartments, or new secondary suites that didn't exist before that date. Landlords of exempt units can increase rent by any amount, provided they give proper notice with the N1.
For 2026, the rent increase guideline is 2.5%, as published by the Ontario government's residential rent increases page. If your unit is rent-controlled, you cannot exceed this unless you've applied for and received approval for an Above Guideline Increase.
If you're unsure whether your unit qualifies for the rent control exemption, err on the side of caution and stay at or below the guideline. The consequences of an illegal above-guideline increase include the tenant filing a T1 application and you having to repay the excess amounts collected.
If you believe you have grounds for a larger increase on a rent-controlled unit — capital expenditures, utility cost increases, security service costs — you'll want to read up on the above-guideline increase process before proceeding.
The Two Rules That Apply to Every N1
Before completing the form, make sure you can satisfy both of these rules. If you can't, don't serve the notice yet.
Rule 1: The 90-Day Notice Requirement
The N1 must be given to your tenant at least 90 days before the date the increase takes effect. Not 89 days. Not "approximately three months." Count it out. If the rent increase date is September 1, you must serve the N1 no later than June 3 (to allow 90 clear days).
Serving the N1 late — even by one day — makes the entire notice invalid. The tenant is under no obligation to pay the higher rent, and you'll need to issue a fresh N1 and restart the 90-day count.
Rule 2: The 12-Month Rule
You can only increase rent once every 12 months. The 12-month period is measured from either:
- The date the tenancy began (for the first increase), or
- The date the last rent increase took effect
So if you last raised rent on April 1, 2025, the earliest your next increase can take effect is April 1, 2026. You cannot serve an N1 targeting a date that falls within 12 months of the previous increase.
Getting both of these right is what raising rent in Ontario the right way requires — and it starts well before you write anything on the form.
How to Complete the N1 Form — Field by Field
The N1 is straightforward if you understand what each section is asking. Here's a field-by-field walkthrough.
Tenant's name and address Fill in the full name of all tenants on the lease, and the complete rental unit address including unit number. This must match the lease exactly. If the lease names three tenants, all three should appear on the N1.
Landlord's name and address Your full legal name (or company name) and contact address. If you use a property manager, you may list the management company here, but the address must be somewhere the tenant can reach you. Do not leave this blank.
Current lawful rent The rent being charged right now — the amount the tenant currently pays. This is the base for calculating the new rent.
New rent amount The amount you're increasing to. It must be a specific dollar figure — not a percentage, not a range. Calculate it before completing the form. For a rent-controlled unit, confirm the amount doesn't exceed the guideline percentage applied to the current rent.
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Date of rent increase This is the date the new rent takes effect. It must be the same day of the month as the rent payment due date. If rent is due on the first of the month, the increase must also take effect on the first of a month — at least 90 days after you serve the notice.
Signature and date Sign and date the form. The date you sign it is not the effective date — it's just the date of completion. The effective date is the rent increase date you entered above.
That's the entire form. There are no trick fields, but there are two calculation errors landlords make repeatedly:
Using a rounded number that exceeds the guideline. Example: current rent is $1,450, guideline is 2.5%. Legal maximum: $1,486.25. If you round up to $1,490 on a rent-controlled unit, that's a violation — even if it's only $3.75 over.
Confusing the serve date with the effective date. The serve date is when the tenant receives the notice. The effective date is when the higher rent kicks in. These are not the same. There must be at least 90 days between them.
How to Serve the N1 Correctly
An N1 that doesn't reach the tenant in a legally recognized way is the same as an N1 that was never given. These are the valid service methods under the RTA:
Hand delivery to the tenant directly You can hand the notice to the tenant in person. Same-day service — the day you hand it over counts as the service date.
Mail If you mail the N1, it's deemed received five days after the postmark date. Factor that in when you calculate your 90 days — the clock starts five days after mailing, not on the day you put it in the envelope.
Courier or document exchange Next business day after the date it was picked up by the courier.
Email or fax Only valid if the tenant has agreed in writing to receive documents electronically. A blanket consent clause in the lease may suffice, but if there's any doubt, use another method.
Slipping it under the door or in the mailbox Deemed received the next day after it was dropped off.
Best practice: hand-deliver a physical copy and keep a dated photo of the completed form. If the tenant later claims they never received it, you have documentation. This matters a great deal if you ever end up at the LTB defending the increase.
Speaking of LTB documentation — your record-keeping on rent increases connects directly to your landlord record-keeping obligations, especially if you manage multiple units with staggered increase dates.
When the Tenant Disputes the Increase
A tenant who receives an N1 and believes the increase is illegal — or procedurally defective — can file a T1 application with the LTB (Tenant Application About a Rent Increase). Common grounds for a T1:
- The increase exceeds the guideline on a rent-controlled unit
- The N1 wasn't served with enough notice
- The 12-month rule wasn't respected
- The notice was served incorrectly
If the LTB finds the increase was improper, it can order you to repay any excess rent collected. The tenant can also withhold the above-guideline portion while the application is pending — they must pay the old amount plus the legal guideline increase, but not the excess.
The best protection against a T1 is a correctly completed N1, served correctly, with documented proof of service. Landlords who lose T1 hearings almost always did so because of a procedural error, not because the LTB disagreed with their business decision to raise rent.
Common N1 Mistakes Ontario Landlords Make
After walking through the full form, here are the errors that show up most often:
Serving late. Rushing the notice at the end of June for a September 1 increase — and missing the 90-day window by a few days. Put a calendar reminder three months before your target date.
Wrong effective date. The increase date doesn't match the rent payment day. If rent is due the first, the increase can't take effect on the 15th.
Misidentifying the current lawful rent. If your tenant was ever overcharged, the "lawful rent" may actually be lower than what they've been paying. The N1 must be based on the lawful rent, not just what the tenant currently sends you.
Not updating LMR interest. This doesn't invalidate the N1, but many landlords forget that when you raise rent, the tenant's last month's rent deposit must also be topped up to reflect the new rent amount — and you owe them interest on the deposit at the annual guideline rate. These are separate obligations, but they follow every rent increase. If you're not tracking this, you should be — it's one of the issues covered in what landlords can and cannot deduct from last month's rent.
Thinking a lease renewal automatically adjusts rent. It doesn't. Even at the end of a fixed-term lease, you must serve an N1 with proper notice if you want to increase rent. The lease renewal process and the rent increase process are entirely separate. If you're navigating both at the same time, the lease renewal guide for Ontario landlords covers how they interact.
N1 Key Takeaways
- The N1 is the only valid written notice of rent increase for Ontario residential tenancies
- Give at least 90 days' notice — counting from the date of service, not the date you fill it out
- Only raise rent once every 12 months
- For rent-controlled units (occupied before November 15, 2018), the increase cannot exceed the annual guideline (2.5% for 2026)
- Enter a specific new dollar amount — not a percentage
- Document your service: photo of the form, confirmation of delivery method
- After a rent increase, top up the tenant's LMR deposit to reflect the new rent amount and pay interest owed
The N1 is not a complicated form — but getting it wrong costs you months of lost revenue and forces you to start over. Fill it out carefully, serve it on time, and keep your records.
If keeping track of rent increase timelines, N1 service windows, LMR interest obligations, and LTB paperwork sounds like a lot — it is. Prospera Properties manages residential rentals in London, St. Thomas, and Strathroy, Ontario. We handle the notices, the timelines, the documentation, and the tenant communication — so you never miss a deadline. Contact us to talk about what full-service property management looks like for your portfolio.