From 1 March 2026 Ireland uses a national rent cap, generally the lower of 2% or CPI per year. Confirm the current rule on rtb.ie. Landlords still search “RPZ calculator” — that query belongs on the rent-cap calculator.
Walkthrough (19 September 2026)
- Open the rent-cap calculator.
- Type the monthly rent you charge today.
- If you have looked up CSO CPI, type that percentage. Leave it blank to see the 2% ceiling.
- Optional: type the date you want the new rent to start as dd/mm/yyyy (for example 01/12/2026). The page shows 90 calendar days before that date as a notice hint.
- Keep the notice draft on the property under Rent increases. Stay compliant with RTB rules.
This helper does arithmetic, not a map of old RPZ designations. CPI: cso.ie. Citizens Information also summarises rent increases. The RTB tools hub sits next to the calculator.
Last updated: 19 September 2026
Questions: support@smartrent.ie