Requirements depend on whether the notice is from the tenant or landlord and how long the tenancy has lasted. Tenant notice periods generally range from 28 to 112 days, while a landlord’s notice period can range from 90 to 224 days, with additional rules about the reason and evidence required. A notice should be written, signed and dated, state the termination date, and meet the statutory format; landlords must generally send a copy to the RTB within 28 days. Check the RTB’s current notice-period calculator, particularly for tenancies starting under newer rules, or ask a solicitor about your circumstances.