Rent Indexation Clause
A lease provision allowing the rent to be periodically adjusted — most commonly to an official inflation index — without requiring the parties to renegotiate or sign a new agreement each time.
Applies to Poland.
Definition
A rent indexation clause (klauzula waloryzacyjna czynszu) relies on the general contractual freedom recognized in Article 353(1) of the Civil Code and, where the parties choose an official reference figure, on Article 358(1) §2, which permits a contract to provide for a payment obligation's amount to be determined by a specified measure of value other than money — most often the Consumer Price Index published by Statistics Poland (GUS).
Without an indexation clause, a landlord who wants to raise rent on an ongoing lease must either wait for the fixed term to end, or — for an indefinite-term residential lease — follow the notice-based rent-increase procedure under the Tenant Protection Act, which requires advance written notice and gives the tenant a right to challenge an excessive increase.
A well-drafted indexation clause states the exact index used, the review frequency (typically annual), and whether the adjustment is automatic or requires a written notice to take effect — vague wording here is a common source of later disputes.
Examples
A three-year commercial lease includes a clause raising rent every January 1st by the prior year's GUS-published inflation rate.
A residential lease with no indexation clause forces the landlord to use the formal, notice-based rent-increase procedure instead, giving the tenant a chance to contest the new amount.
A tenant reviewing a lease notices the indexation clause doesn't specify which inflation index applies, and asks the landlord to name a specific published index before signing.
How this affects buying and selling
For landlords, a clear indexation clause is a simpler and less confrontational way to keep rent in line with inflation than relying on the statutory rent-increase notice procedure each time. For tenants, a vague or open-ended indexation clause is worth pushing back on before signing — it should name a specific, independently published index rather than leaving the adjustment to the landlord's discretion.
