Check Index Rent: Tenants' Rights in Germany

Rent & Rent Control 3 min read · published September 07, 2025

As a tenant in Germany, it is important to check index rents carefully: they tie the rent to a price index and can lead to surprising increases. This checklist explains in clear language which contract clauses you should check, which deadlines apply and which official forms or courts are responsible in case of disputes. You will learn how to collect evidence, write formal objections and meet deadlines to enforce your rights without unnecessary escalation. The guide is practical and shows specific form titles and examples so you are prepared in case of a disputed adjustment. The notes are based on the relevant laws and procedures in Germany and name the competent courts and the most important provisions for tenancy and procedural law. At the end you will find a clear step-by-step guide, an FAQ and links to official forms so you can act quickly.

What is index rent and when to check?

Index rent means the agreed rent is tied to a price index. First check the exact wording in the lease: is there a binding index clause or just an informal reference? Pay attention to start date, calculation formula and reference index. Also read whether service charges are shown separately or included.

Read the index clause in your lease word for word before agreeing.

Checklist: check immediately

  • Check contract wording (form): Is an index clause clear and agreed in writing?
  • Clarify deadlines (time): Is there a termination or change period and when does the adjustment apply?
  • Verify calculation (rent): Check examples and base values used for the increase.
  • Document housing condition (repair): Check for defects that could justify a rent reduction.
  • Collect evidence (document): Gather letters, photos, receipts and payment records to prepare an objection.
Detailed documentation increases your chances of success in negotiations or court proceedings.

Forms and templates

Important official documents tenants should know include a written objection letter to the increase, a template letter for rent reduction and court filings such as a payment order or a suit at the local court. In an objection, state the concrete calculation errors and attach evidence. A simple example: an objection that lists the date of the increase, the calculated amount and the specific points you dispute.

Examples of official form titles (not exhaustive): termination template, application for a payment order, complaint filing at the local court.[4]

What to do if the landlord insists on adjustment?

Act decisively: first object in writing and on time, note deadlines and, if necessary, request a recalculation. If no agreement is possible, consider an out-of-court settlement or initiating court proceedings at the competent local court.[3]

Respond to written notices within the stated deadline.

Communication and evidence preservation

Keep a log of all conversations with dates, times and contact persons. Send important objections by registered mail or email with read receipt. Keep payment slips and service charge statements safe; they are key evidence if a court dispute arises.

FAQ

Can the landlord unilaterally increase an index rent?
Only if there is an effective index clause in the lease and the calculation is correct. Otherwise tenants can object and demand a review.
Which courts are competent if I need to sue?
Most tenancy disputes are handled by the local district court; appeals go to the regional court, and significant precedents come from the Federal Court of Justice.[3]
Which deadlines do I need to observe?
Deadlines are in the lease or in law; respond promptly, usually within a few weeks, to avoid losing rights.[2]

How-To

  1. Set a deadline: read the landlord's notice and note the response time (time).
  2. Draft an objection: write a formal letter with reasons and evidence (form).
  3. Gather evidence: attach photos, statements and bank records (document).
  4. Seek contact: try to reach an agreement with the landlord or their representative (call).
  5. Court action: if necessary, file a claim at the local court and reference relevant statutory provisions (court).[1]

Help and Support


  1. [1] Bürgerliches Gesetzbuch (BGB) §535
  2. [2] Zivilprozessordnung (ZPO)
  3. [3] Information on courts and jurisdiction (Justiz portal)
  4. [4] Federal Court of Justice (BGH) - decisions and information
Bob Jones
Bob Jones

Editor & Researcher, Tenant Rights Germany

Bob writes and reviews tenant law content for various regions. They’re passionate about housing justice and simplifying legal protections for tenants everywhere.