How Rent Is Calculated for a New Tenant vs an Existing One

The core distinction: setting rent versus increasing it

One of the more confusing aspects of Ontario's rent rules is that the annual guideline percentage everyone talks about only really governs one specific thing: how much a landlord can raise the rent for an existing tenant during an ongoing tenancy. It generally does not govern what a landlord can charge when setting the initial rent for a brand-new tenancy with a new tenant moving into a vacant unit. These are two different legal questions under the Residential Tenancies Act, 2006 (RTA), even though people often use the word "rent increase" loosely to describe both.

When a unit becomes vacant and a landlord is entering into a new tenancy agreement with a new tenant, the landlord generally has latitude to set the initial rent at whatever amount the landlord and new tenant agree to — there is generally no guideline cap limiting what that starting rent can be, even if it represents a large jump from what the previous tenant was paying.

Why this is sometimes called "vacancy decontrol"

This feature of Ontario's system is often referred to informally as vacancy decontrol — the idea that rent control-style limits (in this case, the guideline) apply while a tenancy continues, but effectively fall away once a unit is vacated and re-rented to someone new, only to re-attach once the new tenancy is underway. This is a deliberate structural choice in how the RTA is written, not an oversight or a loophole being exploited. It means the guideline functions primarily to protect a sitting tenant's annual rent trajectory within a continuing tenancy, rather than to cap what rents can look like across the market more broadly as units turn over.

What actually counts as a new tenancy

Because so much turns on whether a tenancy is genuinely new, it matters to understand what that actually means. A new tenancy generally arises when a previous tenant has vacated — whether by giving notice, by agreement, or following an eviction — and the landlord subsequently enters into a fresh tenancy agreement with a different person or people who were not party to the old tenancy. The key features are that the old tenancy has actually ended and that the new occupant is a genuinely new tenant under a new agreement, not simply a continuation of the same tenancy under a different label.

Assignment and the same-tenancy question

This is where things get more complicated, because not every change in who's living in a unit creates a new tenancy in the legal sense. An assignment — where an existing tenant, with the landlord's consent, formally transfers their tenancy to a new tenant who then steps into their place — is generally treated as a continuation of the same tenancy, not a new one, even though the person living there has changed. Because the tenancy itself continues, the guideline and the 12-month spacing rule generally continue to apply based on the original tenancy's history, not reset to zero just because the occupant changed through an assignment.

Adding or removing a roommate on an existing lease

Similarly, adding a roommate to an existing lease, or one roommate moving out while others stay and the tenancy otherwise continues, generally does not create a new tenancy for guideline purposes, as long as the underlying tenancy agreement with the landlord is continuing rather than being replaced by a genuinely new agreement with new parties. Landlords sometimes attempt to treat a lease renewal or a roommate change as an opportunity to reset the rent as though it were a new tenancy — but if the existing tenancy is genuinely continuing, this is generally not accurate, and the ordinary guideline and notice rules generally still apply.

Once the new tenancy actually starts

Once a genuinely new tenancy has begun — a new tenant, a new agreement, following a prior tenant's actual departure — the standard rules for an ongoing tenancy generally kick back in from that point forward. The new tenant's first possible rent increase generally cannot happen until at least 12 months have passed since their tenancy began, and from that point on, the guideline percentage (subject to the exemptions discussed elsewhere on this site) generally applies to that tenant's rent going forward, just as it would for any other existing tenant.

Why this distinction matters so much in practice

This distinction matters because it explains a pattern many people notice but don't always understand: why rent for the exact same unit can look very different depending on whether you're the long-standing tenant or the person who just moved in. It also explains why landlords and tenants sometimes disagree sharply about whether a particular change in occupancy was a genuine new tenancy or a continuation of an old one — because the financial stakes of that characterization can be significant, especially where a sitting tenant has been paying well below what the unit could command on the open market after several years of guideline-capped increases.

This gap between what a long-term tenant pays and what a new tenant would pay for the identical unit is sometimes described as the "rent gap," and it tends to grow larger the longer a tenancy continues, since each year's guideline increase is applied to an already below-market base rather than to whatever the unit would fetch if re-rented. For some landlords, this creates a real financial incentive to see a tenancy end so the unit can be re-rented at a higher starting amount — which is part of why the RTA's eviction rules exist independently of the rent rules, to prevent that incentive from being used as a pretext for ending a tenancy that would otherwise continue. A tenant facing an eviction notice that seems to coincide suspiciously with a large rent gap may want to look closely at whether the stated grounds for the notice actually hold up, since bad-faith terminations aimed at clearing out a below-market tenancy are themselves something the LTB can scrutinize.

Why some tenants track the rent history of their unit

Because the distinction between a new tenancy and a continuing one carries real financial weight, some tenants find it useful to keep a simple record of their own rent history — the original starting rent, every notice received, and every increase that actually took effect. This kind of record can be valuable evidence if a dispute ever arises about whether an increase was properly calculated, whether 12 months had actually passed since the last one, or whether a change in occupancy was handled as an assignment versus a termination and new tenancy. It's a small amount of ongoing effort that can save considerable confusion later, particularly in a long-term tenancy where the details of an increase from several years earlier might otherwise be hard to reconstruct from memory alone.

How to tell which situation actually applies to you

If you're trying to figure out which set of rules applies to a specific situation, the central question is generally whether the previous tenancy has actually ended and a new agreement has been entered into with a new tenant, or whether the existing tenancy is simply continuing with some change around its edges, such as an assignment, a roommate change, or a lease renewal with the same tenant. Reviewing the actual tenancy documents, and how occupancy changed, is generally the most reliable way to answer that question, rather than relying on how a landlord or tenant happens to have described the situation informally.

Frequently Asked Questions

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Reviewed by Ryan J. Manilla, BA, JD

Legal Reviewer · Landlord Tenant Ontario