Illegal Rent Increases: What a Tenant Can Do About Them

What actually makes a rent increase "illegal"

"Illegal rent increase" isn't a single, narrow legal term, but it's a useful way to describe a rent increase that doesn't comply with the requirements of the Residential Tenancies Act, 2006 (RTA). In practice, this generally covers a handful of recurring problems: an increase that exceeds the applicable guideline percentage without LTB approval for an above-guideline increase, an increase that comes less than 12 months after the tenancy began or the last increase, an increase given with less than the required written notice, or an increase that was never properly put in writing at all. Any one of these issues is generally enough to make an increase unenforceable as given, regardless of how reasonable the landlord's underlying reasoning might otherwise sound.

First steps before escalating anything

Before assuming the worst, it's generally worth carefully reviewing the actual notice against the requirements: the form used, the notice period given, the date relative to the tenancy's start or the last increase, and the percentage or dollar amount involved. Many problems turn out to be simple miscalculations rather than deliberate overreach, and raising the issue directly and calmly with the landlord in writing — pointing to the specific defect — often resolves things without needing to go further. Keeping that conversation in writing, even if it starts as an email or text, generally creates a useful record if the issue doesn't get resolved informally.

Paying under protest versus simply refusing

Tenants sometimes wonder whether they should simply refuse to pay an increase they believe is improper, or pay it while reserving the right to dispute it later. Generally, the lawful rent remains the previous amount when an increase hasn't been properly implemented, meaning a tenant generally isn't required to pay the increased amount at all. That said, some tenants choose to pay the increased amount anyway to avoid conflict, intending to recover the difference later if the increase turns out to have been improper — this is sometimes informally described as paying "under protest." Either approach has trade-offs, and a tenant unsure which path makes sense in their situation may want to think through how confident they are in their read of the notice, and how comfortable they are with a potential dispute over arrears if their assessment turns out to be wrong.

Applying to the LTB to challenge an increase

If an increase isn't resolved informally, a tenant generally has the option of bringing the issue to the Landlord and Tenant Board. This can happen in different ways depending on the specific situation — for example, as part of a broader application addressing rent and other issues, or in response to an application the landlord has brought (such as an eviction application for non-payment of the disputed amount). An adjudicator will generally review the actual notice and the circumstances to determine whether the increase complied with the RTA's requirements, and will generally rule based on that analysis rather than on a general sense of fairness about the amount involved.

What the LTB can generally order

Where the LTB finds that an increase was improperly implemented, it can generally order a range of remedies depending on the circumstances — for example, confirming that the lawful rent remains the previous amount, ordering a credit or repayment for amounts already collected above the lawful rent, or addressing related issues like dismissing an eviction application that was based on non-payment of an improperly increased amount. The specific remedy available will generally depend on exactly what went wrong and what relief the tenant is actually seeking in their application.

An adjudicator's order can also clarify, going forward, what the tenant's lawful rent actually is, which helps avoid a repeat of the same dispute the next time the landlord attempts an increase. In some cases, the order may also address how any future increase should be properly calculated and noticed, giving both sides a clearer baseline to work from afterward.

Evidence that generally helps a tenant's case

A tenant's position is generally strongest when they can produce clear documentation: the original lease or tenancy agreement showing the starting rent and date, copies of every notice of rent increase received over the life of the tenancy, and records of what was actually paid and when. Comparing the dates and amounts across this history against the applicable guideline percentages for each year can often reveal exactly where an increase went wrong, whether it's a timing issue, a notice defect, or a math error. Keeping this kind of record as a tenancy continues, rather than trying to reconstruct it after a dispute has already started, generally makes the process considerably easier.

Bank or e-transfer records showing exactly what was paid and when can also be valuable, particularly where a landlord disputes what amount was actually being charged at a given point in time. Where a notice was delivered by email or text rather than handed over in person, keeping those messages — including the date stamps — can help establish precisely when notice was actually given, which matters directly to whether the required notice period was respected.

Concerns about retaliation for challenging an increase

Some tenants hesitate to challenge an improper increase out of concern that doing so might prompt a landlord to retaliate — for example, through an eviction notice shortly afterward. The RTA generally does not permit a landlord to end a tenancy simply because a tenant exercised their rights, such as by raising a legitimate dispute about rent. A notice of termination that follows closely on the heels of a tenant's complaint, and that doesn't appear to be based on genuine, independent grounds, can itself be scrutinized by the LTB. That said, tenants who are concerned about this dynamic may want to document the timeline of events carefully, in case the issue of retaliation needs to be raised later.

When it's worth getting outside help

Straightforward notice defects — like an obviously too-short notice period, or a percentage well above the guideline with no AGI approval — are often fairly easy for a tenant to identify and raise on their own. Where things get more complicated — a long tenancy history with several increases, an assignment or roommate change along the way, or an increase tied to a disputed included service — it can generally help to consult the LTB's own published guidance, a community legal clinic, or a paralegal before deciding how to proceed, particularly if an eviction application is already in progress alongside the rent dispute.

It's also worth thinking about how a dispute over an improper increase fits into the broader relationship with the landlord, especially in a tenancy expected to continue for years. Some tenants choose to resolve a smaller, clearly identifiable error informally and keep the relationship cooperative, while reserving a formal LTB application for situations involving larger amounts, a pattern of repeated issues, or a landlord who's unwilling to correct a clear mistake once it's been pointed out. There's no single right approach — the right path generally depends on the size of the dispute, how confident the tenant is in their read of the rules, and how the landlord has responded so far.

Frequently Asked Questions

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Reviewed by Ryan J. Manilla, BA, JD

Legal Reviewer · Landlord Tenant Ontario