Check Index Rent: Tenants in Germany

Rent & Rent Control 3 min read · published September 07, 2025
As a tenant in Germany, it is important to check index rent carefully before agreeing to any adjustment. This article explains clearly which documents you should collect, how the index calculation works and which deadlines apply. You will learn which evidence the landlord must provide, how to check service charges and base values, and when a rent reduction or legal action may be appropriate. I show practical steps for documentation, drafting inquiries to the landlord and preparing for a possible proceeding at the local court. The goal is that, as a tenant, you know your rights, avoid formal mistakes and decide well prepared whether an index adjustment is justified.

What does index rent mean?

With index rent, the agreed rent is linked to a price index, usually the consumer price index. The exact legal basis for tenancy rights and duties can be found in the German Civil Code (BGB), particularly in the general rules on rental agreements.[1]

Index rent ties the rent amount to an official price index.

Preparation: Documents and Evidence

Collect all documents in advance so you can follow the calculation. Watch for gaps and formal errors in the landlord's calculation.

  • Current rental agreement with index clause (rent contract).
  • Rent payments and receipts / rent receipts for recent years.
  • Service charge statements and other documents (document, receipt) for cross-checking.
  • Written calculation from the landlord with the applied formula or form (form).
  • Deadlines and dates, especially objection deadlines (deadline).
Keep receipts organized and stored safely.

When is objection appropriate?

If the calculation is incomplete, incorrect or not transparent, you can object in writing and ask the landlord for a corrected statement. If there are serious doubts about the calculation, court clarification may be necessary; civil procedures are governed by the Code of Civil Procedure and generally heard first at the local court.[2][4]

Respond to legal notices within deadlines to avoid losing rights.

Practical steps if in doubt

  • Check the index formula and compare the index values used with official statistics.
  • Request a complete and comprehensible calculation from the landlord in writing (form).
  • Contact the landlord in writing and document all inquiries (call).
  • Prepare documents for a lawsuit or mediation if necessary (court).
Detailed documentation increases your chances of success in disputes.

Frequently Asked Questions

Can the landlord unilaterally increase index rent?
Only if the index clause is agreed in the tenancy agreement and the increase was correctly calculated under that clause. Otherwise, an objection can be raised.
What deadlines apply for objections?
There is no uniform statutory "objection deadline" for index rent; however, act promptly and in writing to avoid gaps in evidence.
Where can I turn if the dispute is not resolved?
Many rental disputes are heard at the local court; decisions of the Federal Court of Justice may also be relevant for legal questions.[3]

How-To

  1. Collect rental agreement, receipts and service charge statements (document).
  2. Compare the index figures the landlord used with official index data (form).
  3. Send a formal inquiry to the landlord requesting explanations (call).
  4. If necessary, file an objection or a claim within an appropriate period (deadline).
  5. Prepare documents for court and submit them to the competent local court (court).

Help and Support


  1. [1] Bürgerliches Gesetzbuch (BGB) – Gesetze im Internet
  2. [2] Zivilprozessordnung (ZPO) – Gesetze im Internet
  3. [3] Federal Court of Justice (BGH) – Decisions and Information
  4. [4] Justice Portal – Information on Courts (Local Court)
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.