Ontario 2025 Rent Increase Notice. A landlord must also give the tenant written notice of the rent increase at least 90 days before the day the rent goes up. For most tenants covered by the rta, there’s a limit to how much their rent can increase each year.

Landlords must give their tenants 90. It’s a rate that’s the lowest in the country, below the average inflation rate of 3.1 per cent.