The European Central Bank has published the indicative 2027 calendars for the Eurosystem’s regular tender operations and reserve maintenance periods. The reserve maintenance schedule is aligned with the 2027 Governing Council meeting calendar and the timetable for regular tender operations. The tender operations calendar covers only main refinancing operations and three-month longer-term refinancing operations. It excludes any supplementary or ad hoc operations that may be conducted in 2027. The accompanying reserve maintenance calendar sets the start and end dates for each maintenance period, including maintenance period 8 of 2026 and maintenance period 8 of 2027, and specifies the reserve base reference data for monthly and quarterly reporting institutions.