Indexed Rent Contract: Tenant Checklist Germany

Lease Agreements & Types 3 min read · published September 07, 2025

As a tenant in Germany, you may face specific questions with an indexed rent contract: how does indexation affect rent, what deadlines apply to renewals, and what rights do you have against the landlord? This practical checklist explains step by step what to check, which official forms are relevant, and how to assess documents, evidence and possible rent increases. I describe plainly when a conversation suffices, when written delivery is necessary, and which courts in Germany are competent. At the end you will find concrete action recommendations, a sample approach for renewal and guidance on authorities, deadlines and securing evidence. Tips for communication with the landlord.

What is an indexed rent contract?

An indexed rent contract ties the rent to a price index, usually the consumer price index. That means: if the index rises, rent can increase proportionally; if the index falls, rent can theoretically decrease. Tenants should know exactly how the formula is defined in the contract and whether additions or caps were agreed. If unclear, a precise review of the calculation and the adjustment periods specified in the contract is worthwhile.

In most cases the index formula is contractually fixed and cannot be changed arbitrarily.

Checklist: Review before renewal

  • Check the index formula and the concrete rent calculation for plausibility.
  • Note and respect deadlines for renewal or objection and record all dates.
  • Secure written agreements, amendments and all forms.
  • Collect receipts, statements, photos and correspondence as evidence.
  • Conduct negotiations in writing or confirm verbal agreements by registered mail.
  • If necessary: prepare documents for the competent local court.
Record every contact, date and summary of the conversation clearly.

Forms and templates

The following forms and template letters are relevant for tenants. Name the form, use it in time and always attach evidence.

  • Termination letter (BMJ sample) — use it if you end the tenancy or must respond to set deadlines; send by registered mail.
  • Defect notice / rent reduction: wording for a written defect report and a calculation example for rent reduction.
  • Eviction case forms: if eviction is threatened, specific forms are required at the local court; check deadlines under the ZPO.[2]
Official forms and requirements are usually available on justice or ministry websites.

Legal basis and competent authorities

The most important legal bases are in the German Civil Code (BGB), in particular landlord and tenant obligations (§§ 535–580a).[1] Court proceedings are governed by the Code of Civil Procedure (ZPO).[2] For fundamental legal questions and precedents, the Federal Court of Justice (BGH) is decisive.[3]

Respond promptly to letters from the landlord or court; deadlines are decisive.

What to do in a dispute

Stay factual: document defects and demands, request a precise calculation of the index adjustment if needed and set a reasonable deadline for clarification. First try a conversation; if that fails, send a formal defect notice and consider legal advice or a conciliation service.

FAQ

What is the difference between indexed rent and step rent?
Indexed rent depends on a price index; step rent (staffel) contains fixed increases agreed for certain points in time.
Can I challenge an incorrect index calculation?
Yes. Request a traceable calculation, document your objections in writing and prepare evidence; the local court will decide in case of dispute.
Which deadlines apply to a renewal?
Observe the deadlines in the contract and respond within the named periods; otherwise the contract or statutory rules apply.

How-To

  1. Read the rental contract specifically for the index formula, adjustment period and caps.
  2. Compare the calculation with official index values and note discrepancies.
  3. Send a formal query or defect notice to the landlord if unclear.
  4. Set deadlines for responses and track dates in a calendar.
  5. Prepare documents if court clarification is necessary; file evidence with the local court.

Key takeaways

  • Understand the index formula: it determines every adjustment.
  • Meet deadlines: respond promptly to notices or offers.
  • Increase documentation: receipts, photos and correspondence strengthen your position.

Help and Support / Resources


  1. [1] §§ 535–580a BGB — Gesetze im Internet
  2. [2] Code of Civil Procedure (ZPO) — Gesetze im Internet
  3. [3] Federal Court of Justice — Decisions and Info
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.