Who pays for CPI rent indexation in Poland

Indexation of rent by the CPI (GUS) can raise questions for both tenants and landlords. In this article I explain when an owner can increase the rent, which lease clauses matter, and what rights a tenant has in Poland. I describe the notification procedure for increases, deadlines, documentation duties and possible ways to negotiate or appeal to court. If you are concerned about an unjustified indexation, you will also learn how to prepare evidence, file a case at the district court and where to seek free help. The article suggests practical steps a tenant can take to protect their interests.

What does CPI rent indexation mean?

Indexation means adjusting the rent amount to changes in the consumer price index published by GUS, usually over specified accounting periods ^[3]. In practice this means rent can rise proportionally to inflation if the lease provides such an indexation method.

Who pays and when

The basic rule is: indexation is applied according to the lease agreement and applicable regulations, including tenant protection laws and the Civil Code ^[1][2]. If the lease provides CPI-based indexation, the calculation method must be clear and the tenant should receive a written breakdown of the increase.

What to check in the lease

• The exact clause on how indexation is calculated and the periods when it applies.
• The reference base or period (month/year) used for comparison.
• Information about who bears additional costs related to indexation.
• The procedure for notifying the tenant of the new rent and the payment deadline.

FAQ

How is rent indexation calculated?

Indexation usually involves multiplying the base rent by the change in the CPI; check the lease and calculation evidence.^[3]

Can the owner freely raise the rent after indexation?

No. The increase must result from the lease or applicable law; if in doubt you can bring the matter to court.^[1]

What deadlines do I have to file an objection?

Deadlines come from the lease and the Civil Code; act quickly, usually within 14–30 days, check your lease and seek legal advice.^[2]

How to

1. Check the lease provisions on indexation and the parties' obligations.
2. Ask the owner for a written calculation of the new rent and the basis for the calculation.
3. Compare the calculations with CPI data and make your own calculation note.
4. Gather evidence: the lease, correspondence, receipts and your calculations.
5. If negotiations fail, file a claim in the district court or use mediation.

Help and support

• ISAP – legal acts database (isap.sejm.gov.pl)
• gov.pl – official government information
• Ministry of Justice – court information

1. [1] ISAP — Act on the Protection of Tenants' Rights
2. [2] ISAP — Civil Code
3. [3] gov.pl — Information on CPI indicators (GUS)