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Rent increase checker

CPI to September 2026

Rent can rise once a year by 2% or the rise in the Consumer Price Index, whichever is lower. Enter the rent and dates to see the maximum new rent and the earliest date it can start.

Maximum new rent a month 
Increase allowed
 
Earliest start
 
Serve notice by
 
Notice period
 

This is an estimate of the legal maximum under the rent control rules, using published CSO figures. A landlord must use the RTB Rent Calculator for the figure in a rent review notice, and the RTB decides disputes. It does not cover Approved Housing Body, cost rental or student accommodation tenancies. It is not legal advice. Terms of use.

Illustration for the rent increase checker calculator

Worked example

Rent of €1,500 a month, last set on 1 October 2025, reviewed from 1 October 2026. One year has passed, so the 2% limit allows 2%. CPI went from 103.4 in September 2025 to 107.6 in September 2026, a rise of 4.06%. The lower figure is 2%, so the most the rent can be is €1,530.00, an increase of €30.00. The notice had to reach the tenant and the RTB by 3 July 2026.

Rent of €1,200, last set on 15 January 2025, reviewed from 15 July 2026. That is 1 year and 181 days, so the cap is 2.99% (2% for the full year plus a pro rata share for the part year). CPI rose 5.13%, so the cap applies: up to €1,235.90.

The first example as a new apartment built after June 2025. The rent can follow CPI in full: up to €1,560.92.

How the maximum rent is calculated

  1. Work out the time since the rent was last set: 2% for each full year, and a pro rata share of 2% for any part year.
  2. Find the CSO Consumer Price Index (All Items) for the month before the rent was last set and the month before the new rent starts. The rise between them is the CPI change.
  3. The new rent can be the old rent increased by the lower of the two. If CPI fell, no increase is allowed.
  4. The new rent can start no earlier than 12 months after the last setting, and the landlord must give 90 days' notice to the tenant and the RTB.

When a CPI month has not been published yet, this calculator uses the latest month (September 2026) as an estimate. The RTB Rent Calculator uses the same published index. Before 1 March 2026 the index was HICP; this calculator uses CPI for both dates.

Rules by tenancy

TenancyYearly increaseReset to market rent
Began before 1 March 20262% or CPI if lowerNot allowed
Began on or after 1 March 20262% or CPI if lowerAt the end of each 6-year cycle, and for a new tenancy unless the last one ended on no-fault grounds
New apartment, building began from 10 June 2025CPI, no 2% capAs for tenancies from 1 March 2026

Sources

Rates last checked 10 October 2026. Every figure is listed on rates and sources.

Questions

How much can my rent go up in Ireland?
Since 20 June 2025 rent control covers the whole country. Rent can go up once every 12 months, by no more than 2% a year or the rise in the Consumer Price Index (CPI) over the same period, whichever is lower. Inflation has been above 2% (CPI rose 4.1% in the year to September 2026), so for most reviews the limit is 2%.
How often can rent be reviewed?
Once every 12 months. Where a tenancy began before its area became a Rent Pressure Zone, the first review cannot take effect until 24 months after the rent was last set; after that, every 12 months.
How much notice must a landlord give of a rent increase?
At least 90 days. The landlord must send the rent review notice to the tenant and to the RTB on the same day, with a printout from the RTB Rent Calculator and the rents of three similar homes from the RTB Rent Register. A notice that misses any of these is not valid.
What changed on 1 March 2026?
The inflation measure changed from HICP to the CSO Consumer Price Index. Tenancies that start on or after 1 March 2026 run in 6-year cycles (tenancies of minimum duration). The rent can be reset to market rent at the end of each 6-year cycle, and at the start of a new tenancy if the last tenant left by choice, broke their obligations, or the home no longer suited their needs. Market resets are not allowed for tenancies that began before 1 March 2026.
Can a landlord reset the rent for a new tenant?
Only in limited cases. For a new tenancy from 1 March 2026, the rent can be set at market rent if the last tenancy ended because the tenant chose to leave, broke their obligations or outgrew the home, if there was no tenancy for 2 years (1 year for a protected structure), or after a substantial change to the home that was offered back to the previous tenant. It cannot be reset after a no-fault termination, such as a sale or a family member moving in. Otherwise the cap applies to the last rent paid.
Do new apartments have a different limit?
Yes. For new apartments and student accommodation where building began on or after 10 June 2025, rent can rise in line with CPI each year, with no 2% cap.
What if my landlord asks for more than the limit?
Ask the landlord to correct it, or refer a dispute to the RTB. Time limits apply, so act soon after you get the notice. The RTB decides disputes and can direct a refund of rent paid above the legal limit.

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