Checking Index Rent: Guide for Tenants in Germany

What is index rent?

With an index rent, the rent adjustment follows changes in the consumer price index. The obligations of landlord and tenant arise from tenancy law in the BGB and from contractual agreements; in disputes the Amtsgericht or higher instances like the BGH decide.^[1][4]

Which documents to collect?

• Copy of the lease with the index clause.
• Correspondence and notices from the landlord about the adjustment.
• Statements and calculation sheets for the index adjustment.
• Proofs of payment (bank transfers, receipts).
• Official consumer price index data (e.g. Destatis link).

How can tenants check index rent?

First, check the contractual index clause for the calculation base and deadlines. Compare the landlord's calculation with the official consumer price index data and verify that the baseline value is correct. If you find discrepancies, request a transparent breakdown in writing and set a deadline for correction.^[3]

Practical examples

Example 1: The landlord increases the rent by index and provides a calculation with a wrong base index. Action: Object in writing, send copies of your documents and name the correct index series. Example 2: Payments are missing from your record. Action: Gather receipts and reconcile payment inflows.

How-To

1. Read the index clause in your lease carefully and note the base year and deadlines.
2. Request the complete calculation and supporting documents from the landlord in writing.
3. Compare the calculation with the official consumer price index (Destatis) and mark deviations.^[3]
4. If no agreement is reached, send a formal letter with a deadline and consider proceedings at the local court (Amtsgericht).^[2]
5. Collect your evidence for possible court clarification and seek legal advice if necessary.

FAQ

Can my landlord introduce an index rent without my consent?

No, index rent must be contractually agreed; subsequent changes require your consent.

What deadlines apply for objections to a calculation?

Specific deadlines are usually in the contract; generally you should object promptly and in writing to avoid disadvantages.

Where do I turn if the dispute cannot be settled amicably?

For tenancy disputes, the local court (Amtsgericht) is responsible in the first instance; for legal questions the Landgericht or Bundesgerichtshof may follow.

Help and Support / Resources

• Gesetze im Internet – BGB §§ 535–580a
• Destatis – Consumer Price Index (CPI)
• Federal Court of Justice (BGH) – Decisions

1. [1] Gesetze im Internet – BGB §§ 535–580a
2. [2] Gesetze im Internet – ZPO
3. [3] Destatis – Verbraucherpreisindex (VPI)
4. [4] Bundesgerichtshof – Entscheidungen