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Interest on Last Month's Rent Deposits in Canada
In most Canadian provinces, landlords are legally required to pay interest on the last month's rent deposit they hold from tenants. This interest compensates the tenant for the use of their money over time. The rate is typically set by provincial regulation and often changes annually, sometimes linked to the rent increase guideline. Understanding how this interest accrues is key for both tenants claiming what they are owed and landlords fulfilling their legal obligations.
How is the Interest Calculated?
The core principle is that interest accrues for each day the landlord holds the deposit. However, provincial rules often specify that interest must be paid or credited annually. If the interest is not paid out each year, it is added to the deposit amount (compounded) for the next year's calculation. This calculator follows that method.
Step 1: Determine the Correct Interest Rate for Each Year
Each province publishes an annual interest rate applicable to rent deposits. For example, Ontario uses the rent increase guideline (2.5% for 2025). British Columbia publishes a separate rate (3.5% for 2025). These rates can change every year. Therefore, to calculate interest over multiple years, you need the rate for each specific calendar year the deposit was held.
Step 2: Calculate Interest for Each Year Separately
The calculator divides the total holding period into annual segments. For each full or partial year, it calculates the interest on the principal amount for that year (which includes previously accrued interest if not paid out). The formula for each year is: Interest = Principal × Annual Rate × (Days in Year / 365).
Step 3: Sum the Annual Interest
The total interest owed is the sum of interest calculated for each year of the holding period.
Worked Example: Ontario with a Rate Change
Alex paid a last month's rent deposit of $1,500 in Ontario on June 1, 2023, and moves out on October 20, 2026. The Ontario guideline rates were 1.2% for 2023, 2.5% for 2024, 2.5% for 2025, and 2.5% for 2026 (assumed for this example).
- Year 1 (Jun 1, 2023 – May 31, 2024): 365 days. Interest = $1,500 × 1.2% × (365/365) = $18.00. New principal = $1,518.00.
- Year 2 (Jun 1, 2024 – May 31, 2025): 365 days. Interest = $1,518.00 × 2.5% × (365/365) ≈ $37.95. New principal = $1,555.95.
- Year 3 (Jun 1, 2025 – May 31, 2026): 365 days. Interest = $1,555.95 × 2.5% × (365/365) ≈ $38.90. New principal = $1,594.85.
- Year 4 (Jun 1, 2026 – Oct 20, 2026): 142 days. Interest = $1,594.85 × 2.5% × (142/365) ≈ $15.51.
Total Interest Owed: $18.00 + $37.95 + $38.90 + $15.51 = $110.36.
Total to be Returned: $1,500 + $110.36 = $1,610.36.
Provincial Variations and Key Points
- Ontario: Interest must be paid annually. The rate is the annual rent increase guideline.
- British Columbia: Interest is payable annually. The rate is set by the Residential Tenancy Branch and is different from the rent increase limit.
- Alberta: No interest is required by law on any type of deposit.
- Saskatchewan, PEI, Newfoundland and Labrador: Interest is required, but rates are often lower and may not change annually.
- Other Provinces/Territories: Rules vary. You must consult local tenancy legislation for the current rate and compounding rules.
Next Steps: Documenting the Return
When returning a deposit with interest, clear documentation protects both parties. A Security Deposit Return Letter formally records the original deposit, any deductions, the calculated interest, and the net amount payable. This is especially important when interest has compounded over several years, as the total can be significant. Providing this breakdown helps prevent disputes and ensures a smooth end to the tenancy.