How Rent Deposits Actually Work in Ontario

What a rent deposit actually is

Most Ontario tenants are familiar with paying "first and last" before moving in, but the legal mechanics behind that "last month's rent" payment are more specific — and more protective of tenants — than the informal phrase suggests. Under the RTA, a landlord can require a rent deposit at the start of a tenancy, and that deposit is not a general-purpose damage or security fund. It has one defined legal purpose: to be applied as payment for the last rental period of the tenancy, whenever the tenancy actually ends.

That single-purpose design is the source of most of the confusion — and most of the disputes — around rent deposits in Ontario, so it's worth working through the rules in order.

How much a landlord can collect

A landlord can generally require a rent deposit of no more than the amount of rent for one rental period — commonly one month's rent for a monthly tenancy, but calculated proportionally for other rental periods (for example, one week's rent for a weekly tenancy). A landlord generally cannot require more than this amount as a condition of entering into a tenancy, regardless of how competitive the rental market is or what a prospective tenant might be willing to offer. If the rent is later legally increased during the tenancy, the landlord may generally also be entitled to require a corresponding increase to the rent deposit, so that it continues to match one rental period's worth of rent at the current rate.

What the deposit can — and can't — be used for

The rent deposit is meant to be applied to the rent due for the final rental period of the tenancy — in practice, this is usually why tenants are told they don't need to pay rent for their last month, because the deposit collected at the start already covers it. It is generally not available to the landlord to apply toward earlier unpaid rent, or to cover the cost of repairing damage, cleaning the unit, or any other expense the landlord incurs during or at the end of the tenancy. Those are separate issues governed by separate parts of the RTA and, where damage is involved, may be pursued through other means such as an application to the LTB for compensation — but not by simply keeping the last month's deposit for that purpose.

The interest a landlord generally owes

Because a rent deposit is effectively held by the landlord for the length of the tenancy, the RTA generally requires landlords to pay the tenant annual interest on it. The rate is generally tied to the provincial rent increase guideline for that year — the same percentage that caps most standard rent increases — rather than a fixed rate set once and never revisited. This interest generally accrues annually and is meant to be paid to the tenant, whether through direct payment or by crediting it against rent, though the specific mechanics can vary. For the current guideline percentage and how it's set each year, see our guide to rent increases in Ontario.

Why a separate "damage deposit" generally isn't allowed

Because the RTA specifically defines what a landlord may collect as a deposit — an amount capped at one rental period's rent, applied to the last period — a landlord generally cannot also require a separate "damage deposit," "security deposit," "pet deposit," or "key deposit" as a further condition of the tenancy. This is one of the clearer examples of the broader principle, discussed in our piece on the Residential Tenancies Act versus your lease, that a lease term cannot expand a landlord's rights beyond what the Act allows, even if a tenant agreed to pay it. A landlord who has suffered actual damage beyond ordinary wear and tear generally has to pursue that separately — for example, through the LTB — rather than through an upfront deposit collected for that purpose.

What happens to the deposit at the end of a tenancy

When a tenancy is actually ending, the rent deposit (plus any accrued interest not already paid out) is generally applied to the rent owing for that final rental period, so the tenant generally does not pay rent separately for that period. This is also why a landlord generally cannot insist a tenant pay their last month's rent in the ordinary way and separately return the deposit — the deposit's entire purpose is to serve as that last payment.

A simplified example of how deposit interest adds up

Because the interest rate changes every year and compounds against whatever the current deposit amount is, it's easier to understand with a simplified illustration than an abstract description. Picture a tenant who paid a $1,500 rent deposit when they moved in. Each year the tenancy continues, the landlord generally owes interest on that deposit calculated using that year's guideline percentage — so in a year where the guideline is, say, 2.5%, the interest owed for that year would generally be roughly $37.50. Over several years, with the guideline rate changing annually, the total interest owed accumulates year over year, and if the rent itself increases, the deposit amount the landlord can require may increase correspondingly, which can in turn affect future interest calculations.

The specific dollar figures here are illustrative only — the actual guideline percentage for any given year should always be confirmed directly, and the exact calculation can get more detailed where rent or the deposit amount changed partway through a year. The broader point is the one worth remembering: this interest is not optional, it's not a one-time payment, and it's based on a rate that's published annually rather than negotiated between landlord and tenant.

What happens to the deposit if a tenancy is assigned or sublet

Rent deposits can also raise questions when a tenancy changes hands partway through — for example, when a tenant assigns their unit to a new tenant with the landlord's consent, or arranges a sublet. In an assignment, where the new tenant essentially steps into the original tenant's place for the remainder of the tenancy, the deposit originally paid is generally meant to continue serving its purpose for the ongoing tenancy, and the departing and incoming tenants often need to work out directly between themselves how the value of that deposit is accounted for, since the landlord's obligation runs to whoever holds the tenancy at its end. A sublet is different in structure — the original tenant generally remains responsible for the tenancy, including the deposit arrangement with the landlord — and the practical handling of money between the original tenant and the subtenant is typically a separate arrangement from the landlord's deposit obligations. Because these situations can get complicated quickly, it's generally worth putting any such arrangement in writing among everyone involved.

If a deposit isn't handled properly

If a landlord has collected more than the lawful deposit amount, refuses to apply it to the last rental period, or hasn't paid the interest owed, a tenant generally has options through the LTB to recover what they're owed. Conversely, landlords who are unsure whether their deposit and interest practices are compliant are generally better off reviewing the current rules than assuming informal practices from years past still apply, since the guideline rate — and therefore the interest owed — changes annually. For a broader look at the rights and obligations on each side of a tenancy, see our overviews of tenant rights and landlord rights in Ontario, and our glossary for quick definitions of the terms used here.

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Reviewed by Ryan J. Manilla, BA, JD

Legal Reviewer · Landlord Tenant Ontario