Last month's rent is probably sitting in your bank account right now. Maybe it's been there for years. And when your tenant finally moves out — leaving a hole in the wall, an unpaid hydro bill, or a fridge full of mystery leftovers — your first instinct is to deduct those costs from that deposit.
Stop. In Ontario, that instinct can land you in front of the Landlord and Tenant Board facing a T1 application and an order to repay double what you took.
Ontario's rules on last month's rent are strict, often misunderstood, and frequently violated by well-meaning landlords who simply didn't know better. This post breaks down exactly what you can deduct, what you cannot, and what your actual options are when a tenant causes damage or skips out on their last utility bill.
What Last Month's Rent Actually Is Under the Residential Tenancies Act
Under the Residential Tenancies Act, 2006 (RTA), last month's rent deposit (LMR) is a rent deposit — not a damage deposit, not a security deposit, not a general-purpose holdback fund.
The law is specific: the LMR can only be applied to the last rent period of the tenancy. That's it. Full stop.
Section 106 of the RTA governs this entirely. It says a landlord may collect a rent deposit from a prospective tenant, but that deposit can only be used as rent for the last period before the tenancy ends. The tenant effectively pre-pays their last month of rent when they move in. When they leave, that deposit covers rent — nothing else.
This is fundamentally different from how security deposits work in many other provinces and U.S. states. Ontario does not allow security deposits for damage. Landlords are prohibited from collecting them under s.105 of the RTA. If you charged a separate "damage deposit" at any point, that's already illegal — and you'd owe that money back with interest.
What You Can Legally Deduct From Last Month's Rent
The short answer: almost nothing.
The only legitimate uses of the last month's rent deposit are:
Last month's rent — when the tenant gives proper notice and moves out, the deposit is applied to their final rent period. You don't receive a rent payment that month; the deposit covers it.
Rent arrears from the final period — if the tenant owes rent specifically for the last rental period and you have explicit agreement or LTB authorization, the deposit covers it.
Interest owed back to the tenant — this one surprises landlords every time (more on this below).
That's the complete list. There is no clause in the RTA that says you can apply the deposit to cleaning, repairs, unpaid utilities, or anything else.
The Interest Obligation Most Landlords Don't Know About
Every year you hold a last month's rent deposit, you owe the tenant interest on it — calculated at the same rate as the annual rent increase guideline set by the province.
Here's how it works:
- The guideline changes each year (for 2026, it's 2.5%)
- You owe interest on the LMR for every full 12-month period you've held it
- You can either pay the interest out each year, or apply it as a credit against rent owed
- Most landlords apply it as a credit: "Your LMR now covers $X more than when you moved in"
If you've held a deposit for five years and never paid interest, you owe the tenant the compounded interest before or at the time the tenancy ends. Failing to pay it is a violation of the RTA — and tenants can file a T1 application to recover it.
Practically speaking, the smartest approach is to top up the LMR each year as allowed — increasing the deposit to match the current rent by applying the annual guideline rate — rather than carrying a growing interest liability.
Understanding this obligation fits directly into your broader knowledge of rent increase rules in Ontario, since the same guideline that caps rent increases also governs LMR interest.
What You Cannot Deduct: The Common Landlord Mistakes
This is where landlords get into serious trouble. The following are common deductions landlords attempt — all of which are illegal under the RTA:
Cleaning and cleaning fees
Even if the tenant left the unit in an appalling state, you cannot touch the LMR deposit for cleaning costs. The deposit is for rent. Period.
Repairs and damage beyond normal wear and tear
Holes in walls, broken fixtures, damaged flooring — you cannot deduct these from the deposit. The deposit is not a damage holdback.
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Unpaid utility bills
If utilities are in the tenant's name (or if the lease made them responsible), any unpaid amounts are a debt between the tenant and the utility provider — not something you can recover from the LMR.
Late fees or charges
Ontario does not permit landlords to charge late fees. Any attempt to deduct supposed late penalties from the deposit would be an unlawful deduction and a separate RTA violation.
Lease-break penalties
If a tenant breaks their fixed-term lease early and you suffer a rent gap, you cannot apply the deposit as compensation. You'd need to mitigate your losses and pursue the claim through the LTB.
Pet damage
Even if you allowed a pet and the animal destroyed your hardwood floors, the LMR cannot be applied to repair costs.
The consistent thread: the moment you apply the LMR to anything other than rent, you're in violation of the RTA and exposed to a tenant application.
So How Do You Actually Recover Damage Costs in Ontario?
This is the real question — and the answer requires a different strategy entirely.
Document everything with a move-in inspection
A detailed, signed move-in and move-out inspection report is your most powerful tool. Without it, you have no baseline to prove what damage the tenant caused versus what was pre-existing. Courts and the LTB expect photographic evidence, written descriptions, and signatures from both parties.
File an L10 Application with the LTB
If a tenant causes damage beyond normal wear and tear, your recourse is an L10 application (Tenant Caused Damage) through the Landlord and Tenant Board. You'll need:
- The move-in inspection report showing the property's prior condition
- Photographs dated at both move-in and move-out
- Repair invoices or estimates from licensed contractors
- Evidence that the damage goes beyond reasonable wear and tear
The LTB can issue an order requiring the tenant to pay compensation. It's not fast, and it's not guaranteed — but it's the legal path.
Small Claims Court for unpaid utility bills
If a tenant owes money for utilities that were in their name or for which they were contractually responsible under the lease, this is a civil debt. You can pursue it in Small Claims Court (claims under $35,000). Your lease agreement and any billing records will be your evidence.
Apply the LMR correctly, then claim the balance
Here's a common scenario: the tenant owes $200 in rent and moves out owing $1,500 in damage. Apply the LMR to the rent — that's what it's for. Then file an L10 separately for the $1,500 in damage. Trying to fold everything into the deposit is both illegal and unnecessary when the LTB process exists.
Knowing how to use these processes properly connects directly to how to handle tenant damage in Ontario — a situation that's far more common than most landlords expect going in.
What Happens If You Make Illegal Deductions
If you apply the LMR to anything other than rent, a tenant can file a T1 application — Application About a Security Deposit. The consequences can be significant:
- You'll be ordered to repay the amount improperly withheld
- The LTB can award the tenant up to double the amount of an illegal deduction in some cases
- You may be ordered to pay the tenant's application filing fee
- A finding against you goes on record, which matters if you're ever in front of the LTB again
Tenants have up to one year after the tenancy ends to file a T1. This isn't a narrow window — a tenant who moved out six months ago can still come back at you if you kept their deposit for the wrong reasons.
Practical Steps for Landlords at Tenancy End
When a tenancy is ending, here's a clean process that keeps you on the right side of the RTA:
- Confirm the last rental period — identify exactly what period the LMR deposit covers based on the tenancy end date
- Calculate interest owed — determine how much interest has accumulated since the deposit was collected and either pay it out or document how it was applied
- Do a thorough move-out inspection — photograph everything, compare to move-in records, note all damage
- Apply the deposit to rent only — do not withhold any portion for cleaning, damage, or anything else
- File L10 or Small Claims separately — if damage or debt exists, use the proper legal channels
- Provide a written accounting — even if not legally required in all cases, giving the tenant a clear breakdown of how their deposit was applied protects you from disputes
Good landlord record keeping throughout the tenancy — not just at the end — is what makes this process clean and defensible.
When the Tenant Doesn't Give Proper Notice
Sometimes tenants just leave. No notice, unit abandoned, deposit still on the table.
In this case, you still cannot pocket the deposit as compensation for whatever mess they left behind. If the tenancy is clearly over, the deposit should still be applied to the last rent period. If the tenant later contacts you claiming the deposit back, you can demonstrate it was applied to rent owed.
For genuine abandonment situations — where you're not sure the tenancy has ended — there's a specific process under the RTA. The abandoned tenancy rules in Ontario are more nuanced than most landlords realize, and acting too quickly can expose you to further liability.
Key Takeaways
- Last month's rent can only be used for rent — the final rental period before the tenancy ends
- You cannot deduct damage, cleaning, utilities, or fees from the LMR under any circumstances
- You owe interest on the deposit for every year you hold it, at the provincial guideline rate
- Illegal deductions can result in LTB orders requiring repayment, sometimes double the withheld amount
- Your actual remedies for damage and debt are the L10 application and Small Claims Court — not the deposit
- Documentation from day one is what makes damage claims winnable
Ontario's rental laws genuinely restrict what landlords can do with deposits. That's not going to change. The landlords who manage this well are the ones who treat the LMR as untouchable and build their damage-recovery strategy around inspections, records, and the LTB process — not around a deposit that was never meant for that purpose.
Prospera Properties manages rental properties in London, St. Thomas, and Strathroy, Ontario. We handle move-in and move-out documentation, LMR tracking, interest calculations, and tenant transitions — so landlords don't face LTB applications over deposit disputes. If you're tired of navigating these rules alone, contact us to learn how we can help.