In Ireland, a landlord must generally give at least 90 days’ notice of a rent increase, using the required rent review notice and stating the new rent and the date it will take effect. The notice must also be sent to the Residential Tenancies Board (RTB) on the same day as it is given to the tenant. Rent increases are subject to statutory limits, including the applicable national rent-control rules and any specific exemptions. Check the RTB’s current guidance, as the validity of a notice can depend on the tenancy’s circumstances.