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German CPI rent calculator (index-linked rent)

Adjust a German index-linked rent with confidence: enter the amount and the two index dates, and the calculator returns the consumer-price-index change, the permitted rent increase and the new rent, using the standard monthly-value method (§ 557b BGB, base 2020 = 100).

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Current rent (€)
Old index value
New index value

Non-binding calculation using the standard monthly-value method (§ 557b BGB). Official index values: German Federal Statistical Office, base 2020 = 100. No guarantee is given.

What is an index-linked rent?

With a German index-linked rent (value-protection clause under § 557b BGB) the rent is tied to the consumer price index (VPI) for Germany. When the overall index published by the Federal Statistical Office rises, the rent may be adjusted by the same percentage, independent of the local reference rent or modernisation.

Formula: how the increase is calculated

The permitted adjustment is a two-step calculation:

1. (new index − old index) ÷ old index × 100 = percentage change
2. current rent × percentage change = permitted rent increase

Worked example

Current rent €1,000, old index 110.7 (August 2022), new index 122.7 (December 2025). The change is (122.7 − 110.7) ÷ 110.7 × 100 = 10.8%. The permitted increase is €108, and the new rent is €1,108.

Key rules under § 557b BGB

  • The rent must stay unchanged for at least twelve months before the first adjustment, and at least twelve months between adjustments.
  • The increase is declared in text form and states the index change and the new rent or the increase amount.
  • The new rent is payable from the start of the month after next, following receipt of the declaration.
  • During the indexation period, modernisation increases (§ 559) are generally excluded, and the reference rent does not apply.
  • It is distinct from stepped rent (Staffelmiete, § 557a), which fixes set amounts on set dates.

Frequently asked questions

Which index do I use for German index-linked rent?

The German consumer price index (VPI, overall index) published by the Federal Statistical Office, current base 2020 = 100. The overall index applies, not individual product groups. This calculator ships the official monthly values.

How often can an index-linked rent be raised?

At most every twelve months. The rent must have stayed unchanged for at least one year before each adjustment (§ 557b(2) BGB).

When does the new rent become payable?

From the start of the month after next, following receipt of the written increase notice. The notice must state the index change and the new rent or the increase amount.

Index rent vs stepped rent (Staffelmiete)?

Index rent follows the consumer price index (§ 557b BGB). Stepped rent fixes set amounts on set dates (§ 557a BGB). The two cannot be combined in the same lease.

Is this VPI calculator legally binding?

No. It is for orientation only. The official index values and your lease wording govern. No guarantee is given.

Managing many index-linked leases?

REPM tracks index values, review dates and deadlines across your whole portfolio, not in one-off spreadsheets. Every adjustment sits on the lease, with its history and evidence attached.

See property management
§ 557b BGBBase 2020 = 100Official monthly values