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How to value and negotiate takeover of indexed tenancies (§557b/§558 BGB) when buying a tenanted flat in Sept–Oct 2026
Step‑by‑step practical guide for foreign buyers: what §557b and §558 BGB mean for index rents, how to check the index and timing, how to value indexed cashflows and the clauses to use in the purchase contract (Sep–Oct 2026).
The law in plain terms
Index‑rent clauses are governed by §557b BGB. The contract must expressly agree an 'indexed rent' tied to the price index published by the Federal Statistical Office (Statistisches Bundesamt). An index increase must be asserted in text form, the declaration must state the change in the index and the monetary amount, and the higher rent becomes payable from the beginning of the second month after the tenant receives the declaration. During an index‑rent agreement, increases under §558 (increase to the local comparative rent) are excluded. ([gesetze-im-internet.de](https://www.gesetze-im-internet.de/bgb/__557b.html?utm_source=openai))
What to check in the lease and the seller’s dossier
Locate the exact clause: note (a) the index named (the law requires the Statistisches Bundesamt VPI), (b) the base index and the date used to calculate the 'Ausgangsmiete' (starting index value), and (c) the last date an index change was declared to the tenant. Ask the seller for the original index‑adjustment notices and proof of the tenant's receipt (registered mail/return receipt or other proof). Under §557b the landlord's adjustment declaration is a formal act; if the seller has declared an increase shortly before closing, the buyer can inherit a higher cashflow from the first payable month after the statutory waiting period. ([gesetze-im-internet.de](https://www.gesetze-im-internet.de/bgb/__557b.html?utm_source=openai))
How to value indexed rental cashflows (practical formula)
Indexed rent moves by the same proportion as the published index: if the index used to calculate an adjustment rises by x % between the base date and the new reference month, the contractual rent rises by x %. That is: new rent = old rent × (index_new / index_base). For valuation, treat the indexed rent as a known step (if the next index value is already published) or as a stochastic growth tied to expected CPI. For an acquisition price adjustment you can calculate the present value of the expected additional cashflow and subtract that from the purchase price, or use it to justify a price premium. Keep the model transparent: list the index dates used, the last declared index change and the next index publication dates. Example: the most recent published inflation figure (August 2026) shows the VPI at an annual change of +2,9 %, which illustrates how a single month’s movement can translate into a proportional rent change if the contractual reference month falls in that comparison. Do not assume October 2026 index values are available — at the time of writing only the August 2026 VPI release is published. ([destatis.de](https://www.destatis.de/DE/Themen/Wirtschaft/Preise/Verbraucherpreisindex/_inhalt.html?utm_source=openai))
Negotiation checklist and contract clauses to propose
1) Condition precedent: require the seller to deliver an up‑to‑date rent schedule and copies of all index adjustment notices no later than a fixed date before notarisation. 2) Price holdback or escrow: for any index increase declared between signing and closing, hold an agreed monetary amount in escrow or obtain a seller warranty. 3) Pro‑rata cashflow adjustment: if an index increase has been declared and becomes payable after closing, adjust the purchase price by the present value of that incremental rent (use the same calculation formula). 4) Warranties and indemnities: ask the seller to warrant that they have complied with §557b formalities and that no undisclosed adjustments exist. 5) Due‑diligence step: verify index levels directly from the Statistisches Bundesamt website and require the seller to specify the exact index series and dates used. These clauses are commercial; get German legal advice and tax input before final wording.
Timing risks for buyers in Sept–Oct 2026
Monthly VPI releases determine the percentage changes that drive index rent adjustments. At the time of writing (21 Sep 2026) the latest published VPI data is August 2026 (annual change +2,9 %), and October 2026 figures will be published later. If a seller issues an index‑adjustment declaration that references a month whose publication falls before closing, the buyer inherits that higher contractual rent. Conversely, a seller may delay declaration until after closing to shift benefit to the buyer. Use contractual cut‑offs and the escrow techniques above to allocate this timing risk. Always verify publication dates and cite the exact Destatis release used in your calculation. ([presseportal.de](https://www.presseportal.de/pm/32102/6349168?utm_source=openai))
When to call a lawyer and a tax adviser
Never sign a purchase contract that contains bespoke adjustments to index clauses or complex price‑holdbacks without a German lawyer reviewing the wording. An adviser should confirm that the seller complied with the formal requirements of §557b and draft escrow/warranty language. A tax adviser should model how indexed rents affect your expected yield, taxable income and any purchase‑price allocation (AfA). This article is explanatory, not legal or tax advice.
Nothing on this page is investment, tax or legal advice. Price bands are indicative asking prices and disagree between sources by design. Verify every figure with a qualified German notary, tax adviser (Steuerberater) or lawyer before committing capital.
