Use the rate for the year the increase takes effect
The allowable annual inflation-based increase is 2.3% for increases effective in 2026 and 2.2% for increases effective in 2027. An unused allowance from a previous year cannot be carried forward, and an increase cannot be rounded up above the permitted amount. The September 2025 edition of RTB-45 lists 2025–2026 examples; use the 2027 announced rate for an increase that takes effect in 2027, even if the downloaded PDF has not yet been updated.
Three whole rental months and 12-month spacing
The landlord must give at least three full rental months' written notice, and the increase cannot take effect sooner than 12 months after the current rent was first established or last lawfully increased. If rent is due on the first of the month and a tenant receives notice during October, November, December and January are the three whole months, making February 1 the earliest potential effective date if the 12-month requirement is also met. Legally deemed receipt can be later than the mailing date; leave extra time for service.
Complete all four parts of the prescribed form
- Part A — Tenant and park: List every affected manufactured-home owner/tenant, mailing address, park name and site address.
- Part B — Landlord: List the legal name of the park owner or landlord's representative and full contact/address details.
- Part C — Increase: Enter the date of the last increase or original rent-setting date, existing rent, exact dollar increase, new rent, payment frequency and effective date.
- Part D — Signature: Landlord or authorized representative signs and dates the notice. Give the tenant the full completed form and retain evidence of authorized service.
What if the landlord also claims higher taxes or regulated utilities?
RTB-45 does not calculate the proportional component for eligible changes in park government levies or regulated public utility fees. The September 2025 RTB-45 PDF refers to RTB-11 for that calculation, while the Province's manufactured-home rent information page calls the current auto-calculating version RTB-11A. If claiming this additional component, use the manufactured-home proportional-increase guide and confirm the current prescribed PDF with the RTB rather than adding a proportional amount to RTB-45 yourself.
Common mistakes
Using the wrong effective year's rate, rounding upward, counting the month in which notice was received as a full rental month, issuing the notice inside 12 months of the previous increase, or using RTB-45 for a combined home-and-site tenancy or a proportional levy/utility calculation.