The Luxembourg Commission de Surveillance du Secteur Financier (CSSF) published version 1.4 of its Reporting Handbook for investment firms, updating guidance on investment firm regulatory reporting. The revisions clarify how firms can adjust the reference and remittance dates of EU reporting templates where their accounting closing date is not 31 December. The updated handbook also makes minor changes to templates reported by class 2 investment firms to reflect the entry into force of the new taxonomy 4.0.