Can a Landlord Increase Rent Mid-Lease for a Fixed-Term Tenancy?

The short answer

A landlord generally can increase rent during a fixed-term tenancy, but only in a specific, limited way, and only once certain conditions are met. The fixed end date on a lease — for example, a one-year term running from June to June — does not by itself prevent a lawful rent increase from taking effect partway through that term. What actually controls timing is the 12-month rule under the Residential Tenancies Act, 2006 (RTA), combined with the required notice period, not the start or end date written into the lease.

Why a fixed-term lease doesn't freeze rent on its own

Many tenants assume that signing a one-year (or other fixed-term) lease locks the rent in place for the entire length of that term, the way a fixed-rate loan might lock in an interest rate. That assumption is generally incorrect under Ontario law. The RTA generally governs rent increases based on how much time has passed since the tenancy began or since the last increase, not based on where a tenant happens to be within a particular lease term. A fixed-term lease is primarily about the length of the tenancy commitment and what happens at its end — it is generally not, on its own, a shield against a properly timed and properly noticed increase.

The 12-month rule that actually controls timing

The RTA generally requires that at least 12 months pass between the start of a tenancy and the first rent increase, and at least 12 months between any two increases after that. This 12-month clock runs from the date the tenancy began (or the date of the last increase), regardless of whether that date lines up with the start or end of a particular lease term. So if a one-year fixed-term lease began on June 1, a landlord generally cannot apply an increase before the following June 1 at the earliest — but once that 12-month mark has passed, the increase can generally take effect even though the original one-year lease term hasn't technically ended yet, for example if the lease term was actually longer than a year, or if the tenancy has continued on a periodic basis after the fixed term.

The practical case that trips people up most often is a fixed term longer than 12 months — say, an 18- or 24-month lease. In that scenario, a landlord generally can apply a properly noticed guideline increase partway through the term, once 12 months have passed since the tenancy began, even though the lease itself hasn't ended.

The notice a landlord generally has to give

Meeting the 12-month spacing requirement is only part of the test. The RTA also generally requires the landlord to give the tenant proper written notice of the increase, using the form approved for that purpose, at least 90 days before the increase is to take effect. This notice generally has to state the new rent amount and the date the increase begins. An increase that is otherwise correctly timed under the 12-month rule but lacks proper written notice, or gives less than the required notice period, is generally not enforceable as given — the landlord would typically need to serve a new, compliant notice and wait out the required period again.

What a lease clause about increases can and can't do

Some leases include a clause stating that rent will increase by a set amount at a specific point, or that it will automatically rise by the guideline percentage each year. These clauses generally do not override the RTA's own notice and timing requirements. Even where a lease includes language purporting to pre-authorize a future increase, the landlord generally still has to provide the proper statutory notice before that increase can actually take effect and be enforced. A clause promising an automatic increase is, in effect, generally treated as a statement of intent rather than a substitute for the legally required notice.

Mid-term increases versus increases at renewal

It's worth distinguishing a mid-term increase from what happens at the end of a fixed term. When a fixed term ends, a landlord and tenant can generally negotiate a new lease with new terms, including a different rent — but even then, if the tenancy is continuing with the same tenant rather than being a genuinely new tenancy with a new occupant, the same 12-month and notice rules generally still apply to how much the rent can go up and how that change has to be communicated. A landlord generally cannot use the mere fact that a fixed term is ending to sidestep the ordinary increase rules for a continuing tenant.

What happens if an increase is attempted improperly

If a landlord tries to raise the rent before the 12-month period has elapsed, or without giving the required written notice, the increase is generally not enforceable, and the tenant generally continues to owe only the previous, lawful rent amount. A tenant who has been paying an improperly increased amount may generally be able to seek a credit or repayment through the LTB for the amount overpaid. Landlords in this position are generally better off correcting the notice and re-starting the required waiting period than trying to enforce an increase that didn't follow the rules.

This can become a particularly awkward situation mid-lease, where a tenant has been diligently paying an amount they later learn wasn't properly authorized. Rather than assuming the matter will simply resolve itself, both sides are generally better served addressing it directly — the landlord by serving a corrected notice, and the tenant by raising the discrepancy in writing — so the lawful rent amount going forward is clear to everyone involved.

Practical takeaways for both sides

For tenants, the key things to check when a mid-lease increase notice arrives are whether at least 12 months have passed since the tenancy began or the last increase, whether the notice was given at least 90 days in advance, and whether the correct form and new rent amount were used. It's also worth checking the math itself — that the increase doesn't exceed that year's guideline percentage unless the landlord has actually obtained LTB approval for an above-guideline increase. Keeping a copy of the original lease, any prior notices, and the new notice side by side generally makes it much easier to spot a timing or math problem.

For landlords, the safest approach is generally to calendar the 12-month anniversary of the tenancy (or the last increase) well in advance, and to serve notice early enough that the required 90-day period comfortably elapses before the increase is meant to take effect, rather than relying on informal conversations or lease clauses alone. It also generally helps to keep a clear record of exactly when notice was given and how — by email, mail, or in person — since a dispute about proper notice can otherwise come down to conflicting recollections about a conversation that happened months earlier. Treating the fixed term as a commitment about length of tenancy, and the 12-month and notice rules as the separate mechanism that actually governs rent timing, tends to avoid most of the confusion that leads to disputes in this area.

Frequently Asked Questions

Related reading

Reviewed by Ryan J. Manilla, BA, JD

Legal Reviewer · Landlord Tenant Ontario