ECB deposit facility 2.50% (effective 16 Sep 2026): how to stop a signed German mortgage offer being re‑priced before notarisation

The ECB decision and why it matters for mortgage pricing

On 10 September 2026 the European Central Bank’s Governing Council raised all three key rates by 25 basis points. The deposit facility rate was increased to 2.50 % with effect from 16 September 2026. ([ecb.europa.eu](https://www.ecb.europa.eu/press/pr/date/2026/html/ecb.mp260910~314e508016.en.html?trk=public_post_comment-text&utm_source=openai))

German mortgage lenders use short‑ and long‑term wholesale funding markets to finance fixed‑rate loans. When ECB policy shifts and wholesale reference yields move, banks can argue their cost of funds has changed and try to re‑price offers that are still unsigned at notarisation. That is now a material risk after the 16 September change. ([ecb.europa.eu](https://www.ecb.europa.eu/press/pr/date/2026/html/ecb.mp260910~314e508016.en.html?trk=public_post_comment-text&utm_source=openai))

Principles to stop repricing before the notary

You cannot rely on verbal assurances. The practical route is (a) get a bank offer that is expressly ‘binding until notarisation’ or contains a firm rate‑lock clause; and (b) record a contract condition in the sale contract (to be notarised) that makes the seller’s obligation subject to the bank’s confirmed, unchanged final terms. Where possible, secure the Auflassungsvormerkung (priority notice) so that the notary can register buyer priority while funding is finalised.

Sample bank and notary clauses below are drafting templates. They are negotiation tools — ask the lender’s relationship manager and your German notary to accept the precise wording and seek a lawyer if the bank resists. For how loans are priced from Pfandbrief references see the worked example in the next section. ([propertyfinder.de](https://propertyfinder.de/en/articles/build-10-year-fixed-mortgage-pfandbrief-bund-sep-2026-berlin-400k?utm_source=openai))

Exact lender clause (english) — sample wording to request

Sample lender clause (to include in the loan offer/contract addendum):

"The lender expressly confirms that the interest rate, margin and other material economic terms stated in this 'Loan Offer' are binding and will not be altered by the lender prior to the date of notarisation of the sale contract, provided the notarisation occurs no later than [date]. Should the lender unilaterally change the stated interest rate before notarisation, the borrower shall have the right to withdraw the offer without penalty and the lender shall reimburse any documented costs reasonably incurred by the borrower in reliance on this offer."

Label this as a negotiated binding term in the bank’s formal offer and ask the bank to initial it on the signed pages.

Exact notary clause (english) — sample wording to include in the sale contract

Sample notary clause (insert in the notarised purchase contract under 'conditions'):

"The obligations of the parties to complete the sale are subject to the lender's written confirmation that the loan will be granted on the economic terms set out in the lender's signed offer dated [date], and that those economic terms remain unchanged at the date of notarisation. If the lender confirms amended economic terms prior to notarisation, the buyer may (i) accept the amended terms, (ii) withdraw from the purchase without penalty, or (iii) require the seller to release any deposit and terminate the contract."

Ask the notary (Notar) to record that the Auflassungsvormerkung shall be entered and that the notary shall not file the transfer until the lender's unchanged confirmation is lodged with the notary.

Worked example using current 10‑year Pfandbrief reference yields

A clean market reference helps test a bank’s repricing claim. The iBoxx Pfandbriefe index (10‑year bucket) reported a tax‑equivalent yield near 3.70 % on 7 Oct 2026; earlier in mid‑September index readings were nearer 4.08 %. Use the specific index figure the bank itself cites as the funding reference. ([spglobal.com](https://www.spglobal.com/spdji/en/indices/fixed-income/iboxx-eur-oeffentliche-pfandbriefe/?utm_source=openai))

Worked illustration (example only, illustrative assumptions): suppose the Pfandbrief 10‑year reference = 3.70 % (iBoxx, 07.10.2026). If a lender claims it funds a 10‑year mortgage by issuing covered paper at that yield and then adds a funding margin of 1,00 % to cover bank costs and credit risk, the theoretical funding cost = 3,70 % + 1,00 % = 4,70 %. If the bank’s written offer showed 4,50 %, the bank cannot plausibly argue a higher cost without showing specific, contemporaneous evidence (changed Pfandbrief trade, executed issuance or changed internal funding mandate). Use the lender clause above to force that evidence into the notarial record.

This is an illustration, not a guarantee. Final pricing depends on the lender’s documented funding trades and their legal willingness to accept a binding rate‑lock; insist that any change be confirmed in writing and fed into the notary file before signing.

Checklist, risks and next steps

Checklist: (1) ask the bank for a written, signed rate‑lock clause 'binding until notarisation' with a specified cut‑off date; (2) insert the notary condition above into the sale contract; (3) ask the notary to note the Auflassungsvormerkung and to require the lender’s unchanged confirmation before filing transfer; (4) if the bank refuses, obtain a short explicit break‑fee or withdrawal right in the contract.

Risks: banks legally may be able to reserve limited re‑pricing rights in small print; notaries cannot force a bank to lend. If a lender will not give a binding offer, consider a shorter lock window, bridge financing, or accept the offer only if the bank posts a penalty‑style commitment (rare). Seek a German notary and a specialist lawyer for firm advice before signing.