For most private tenancies, calculate the proposed increase by applying the lower of the permitted annual HICP inflation rate or 2% to the current rent, after the rent has been unchanged for at least 12 months. For example, on €1,500 rent with a 2% limit, the maximum increase would be €30, giving a new rent of €1,530. Check whether your tenancy falls within an exemption and use the latest RTB or gov.ie guidance, as the rules and applicable rate can change. The landlord must also give the required written notice, and the RTB can ultimately decide any dispute.