Rent increase calculator 2026

Since 1 March 2026 every rent increase in Ireland is capped at the lesser of 2% a year (pro rata) or CPI inflation. Enter the current rent and the dates -- this computes the maximum from the official CSO index, for tenants checking a notice and landlords setting one.

Leinster town -- optional, shows the local average rent for context

Current monthly rent (€) Rent last set on -- the date the current rent took effect or was last reviewed New rent takes effect on -- at least 90 days after the notice is served Proposed new rent (€) -- optional, e.g. the figure on a notice you received

The rules behind the number. A rent review needs 90 days' written notice on the RTB's form, no more than one review in any 12 months, and since 1 March 2026 the notice must cite the rents of three comparable homes from the RTB Rent Register by their RT numbers. Setting a rent above the cap or outside these rules is improper conduct the RTB can sanction -- and for notices served since March 2026, a criminal offence.

Cap formula: Residential Tenancies Act 2004 s.19(4), as amended by the Residential Tenancies (Miscellaneous Provisions) Act 2026 (nationwide from 1 March 2026). Inflation: CSO All Items Consumer Price Index via PxStat CPM02 (CC BY 4.0), the index the Act names. Town rents: RTB Average Monthly Rent via CSO (RIQ02).

Indicative only -- not legal advice. The RTB's own rent calculator is the authoritative check, and its printout is what the notice form expects attached.