CSSF MMFR FAQ Update: What Version 5 Changes for Luxembourg MMF Managers

ByOfficer

Last updated: June 2026

A money market fund manager who keeps a 2018 copy of the CSSF MMFR FAQ open in a browser tab is now reading a superseded version of the guidance. On 2 June 2026 the CSSF reissued its FAQ on the Money Market Funds Regulation as Version 5 and deleted two questions outright. Neither deletion loosens a rule. Both concern 2018 transition points, which makes the deletion easy to misread as a rule change.

The risk is small but real. A compliance officer who cites a deleted FAQ answer in an internal procedure or a response to a CSSF query is quoting a position the authority no longer publishes. The Money Market Funds Regulation itself, Regulation (EU) 2017/1131 of 14 June 2017, has not changed. What changed is the interpretive layer the CSSF maintains on top of it for Luxembourg funds. This note covers what Version 5 removed, why, and which FAQ positions a Luxembourg MMF manager still needs to apply.

Related reading: our breakdown of the European Commission’s MMF Regulation review.

What the CSSF MMFR FAQ Version 5 update changed

The version table on page two of the document records a short history. Version 1 was the first publication on 28 August 2018. Version 2 added a question on 3 November 2021. Version 3, on 8 January 2025, published the list of abbreviations and modified two risk-management questions. Version 4, on 5 June 2025, deleted one investment-policy question. Version 5, dated 2 June 2026, deletes Questions 1.C and 5.D.

Both deleted questions were tied to the original entry into force of the regulation. Question 1.C asked whether, given the changes existing funds had to make as the MMFR took effect, the CSSF would impose a one-month prior notice with redemptions free of charge. Question 5.D asked whether the Article 36(2) disclosure requirement applied as of 21 July 2018 to all funds seeking authorisation. Seven years after the framework went live, neither question describes a live decision a manager faces. The CSSF removed them rather than leave dated transitional guidance in a document people still treat as current.

Why the redemption-notice question was retired

Question 1.C belonged to the 2018 conversion period. New funds had to comply with the MMFR from 21 July 2018, and existing UCITS or AIFs that behaved like money market funds had until 21 January 2019 to apply to their competent authority for authorisation under the regulation (id=fc36d68395be9aad, eur-lex.europa.eu_TXT_9e9cff38.html). During that window a fund might have restructured its dealing terms to fit the new rules, which is why the original FAQ addressed a free-of-charge exit with prior notice.

That conversion is finished. A Luxembourg MMF authorised today was authorised under the MMFR from the start, so there is no entry-into-force restructuring for which a one-month free redemption notice would be the answer. Deleting the question does not mean the CSSF has decided redemption terms no longer matter. It means the specific transitional scenario the answer described no longer occurs.

Why the Article 36(2) start-date question went too

Question 5.D asked a timing question that only made sense in 2018: did the Article 36(2) transparency obligation, the weekly disclosure of items such as the portfolio maturity breakdown and the fund’s credit profile, apply from 21 July 2018 to every fund still seeking authorisation. Once all funds completed authorisation, the start-date framing had no audience. The underlying Article 36(2) obligation is untouched and the FAQ still carries three live questions on it.

This is the trap with a deleted timing question. The disclosure duty did not disappear with the question that asked when it began. A manager who reads the deletion as a softening of Article 36(2) would be wrong. The weekly disclosure stands, the CSSF still allows it to sit on a website named in the sales prospectus, and the manager still chooses the disclosure day, for example each Monday, at its discretion.

The guidance that did not move

Most of the FAQ is unchanged. Three surviving answers a reporting and oversight team leans on:

Deposit concentration. The CSSF does not authorise Luxembourg MMFs to exceed the 10% limit on deposits with the same credit institution under Article 17(1)(b), because it considers there are enough viable credit institutions in Luxembourg and it is feasible to place deposits in another Member State. The 10% ceiling also caps the deposit element of ancillary liquid assets under Article 9(3), and the total holding of ancillary liquid assets stays limited to 20% of net assets.

Liquidity treatment. Deposits with a one-week or one-month term can count as daily maturing assets under Articles 24(1) and 25(1) when they can be withdrawn on one working day’s notice. Reverse repos with a fixed term can also count as daily maturing assets when they can be terminated on one working day’s notice.

Error handling. Since the 8 January 2025 modification, the FAQ confirms that breaches of the WAL and WAM limits, and breaches of the daily and weekly minimum liquidity thresholds, fall within the scope of Circular CSSF 24/856 on the protection of investors in case of a NAV calculation error, non-compliance with the investment rules, and other errors at UCI level. That is the bridge between an MMFR limit breach and the remediation and notification mechanics a conducting officer already runs under that circular. The same fund-level liquidity discipline shows up in our guide to liquidity management tools under AIFMD II.

The reporting misconception worth clearing up

One assumption circulating around any MMFR FAQ change is that it touches the data a fund files with ESMA. It does not, and the distinction matters for anyone mapping this update to a reporting calendar.

The MMFR puts the reporting duty in Article 37. The manager reports a detailed dataset on the fund to its competent authority, the CSSF for a Luxembourg MMF, and the competent authority transmits that data to ESMA, which holds it in a central database (id=29d1e752b4f5f43d, eur-lex.europa.eu_TXT_9e9cff38.html). The onward transfer to ESMA runs under Article 37(5) (id=fc36d68395be9aad, eur-lex.europa.eu_TXT_9e9cff38.html). A manager does not file a separate monthly money market fund return directly to ESMA. For a Luxembourg MMF, Article 37 reporting is to the CSSF at least quarterly, or at least annually where the MMF’s total assets under management do not exceed EUR 100 million; Version 5 does not change that obligation. For the wider Luxembourg filing picture the cadence sits in the CSSF reporting calendar for Q3 2026, and the fund-side reporting build that often runs alongside it is the AIFMD II Annex IV reporting changes.

How to treat a deleted FAQ question in practice

A deletion is the easiest FAQ event to misclassify, so it is worth a fixed rule: a deleted question is not a relaxed rule. The CSSF FAQ is interpretive guidance addressed to managers and funds established in Luxembourg, and it sits on top of the regulation. Removing a question usually retires guidance that has become historical, not the legal requirement underneath. Two habits follow. Re-pull the current version before quoting it, because the CSSF states it will update the document when necessary and may adapt its approach at any time. When a question disappears, trace the point back to the underlying regulation or to another current CSSF source. For Version 5, Article 36(2) still applies, while the deleted Q1.C redemption-notice answer should be removed from current procedures unless a separate current source supports the same point.

Frequently Asked Questions

What changed in the CSSF MMFR FAQ in June 2026?

The CSSF issued Version 5 of its FAQ on the Money Market Funds Regulation on 2 June 2026 and deleted two questions, 1.C and 5.D. Both were transitional questions linked to the 2018 entry into force of the regulation. No new question was added and no surviving answer was rewritten in this version.

Were any reporting obligations removed by Version 5?

No. The deletions concern a transitional redemption-notice question and an Article 36(2) disclosure start-date question. The Article 37 reporting obligation to the CSSF, and the onward transmission of that data to ESMA, are untouched by this update.

Does deleting a FAQ question mean the underlying rule changed?

No. The FAQ is interpretive guidance that sits on top of Regulation (EU) 2017/1131. A deleted question normally signals that the guidance had become historical, not that the legal requirement was withdrawn. The safe step is to trace the point back to its article in the regulation.

Does the CSSF MMFR FAQ cover the report I file under Article 37?

Not directly. The FAQ addresses investment policy, risk management, valuation, and transparency questions. The Article 37 report goes to the CSSF, which transmits the data to ESMA. There is no separate monthly ESMA money market fund return filed by the manager, and Version 5 does not alter Article 37.

Is Circular CSSF 24/856 still the reference for NAV errors and liquidity-threshold breaches in MMFs?

Yes. Since the 8 January 2025 modification, the FAQ confirms that WAL and WAM breaches and breaches of the daily and weekly minimum liquidity thresholds fall within the scope of Circular CSSF 24/856, which covers NAV calculation errors, non-compliance with investment rules, and other errors at UCI level.

Does the MMFR still apply to a Luxembourg MMF marketed only outside Luxembourg?

Yes. The FAQ confirms that a Luxembourg AIF qualifying as an MMF under Article 1(1) is subject to the MMFR even where it is marketed exclusively outside Luxembourg. Version 5 does not change that position.

Can a Luxembourg MMF hold more than 10% in deposits with one credit institution?

No. The CSSF does not authorise an exceedance of the Article 17(1)(b) 10% limit for Luxembourg MMFs, and the same 10% ceiling applies to the deposit element of ancillary liquid assets under Article 9(3), with total ancillary liquid assets capped at 20% of net assets.

Related Articles

Key Takeaways

  • The CSSF MMFR FAQ became Version 5 on 2 June 2026 and deleted Questions 1.C and 5.D, both transitional questions from the 2018 entry into force.
  • Question 1.C concerned a one-month free redemption notice during the original conversion to the MMFR. Question 5.D concerned the 21 July 2018 start of the Article 36(2) disclosure duty.
  • Neither deletion changes the MMFR. The Article 36(2) weekly disclosure obligation continues to apply, but the deleted Q1.C redemption-notice answer should not be treated as current CSSF FAQ guidance.
  • The Article 37 reporting obligation, and the onward transmission of MMF data to ESMA under Article 37(5), are not affected by this update.
  • Circular CSSF 24/856 remains the reference framework for WAL, WAM, and liquidity-threshold breaches in Luxembourg MMFs since the 8 January 2025 modification.
  • Re-pull the current FAQ version before quoting it, because the CSSF updates the document when necessary and may adapt its approach at any time.

Sources and References

What to do before you cite the FAQ again

Open the current Version 5 document, delete any internal reference to the old Questions 1.C and 5.D, and confirm that the surviving deposit, liquidity, valuation, and disclosure answers still read as you remember them. The MMFR did not move under your feet. The CSSF cleaned the guidance, and the only mistake available here is to read a tidy-up as a rule change.

Disclaimer: The information on RegReportingDesk.com is for educational and informational purposes only. It does not constitute legal, regulatory, tax, or compliance advice. Always consult your compliance officer, legal counsel, or the relevant supervisory authority for guidance specific to your institution.

Similar Posts