Every entry below is the rule as Cayman Islands publishes it. It is a reference, not a calendar: where a deadline runs from something only you know, this page says so instead of showing a date.
This is the rule as published by the registry, checked against the primary source on the date shown. It is not your filing date. Where a deadline runs from incorporation, from a fiscal year the company itself elects, or from an event only you know about, no date can be derived here at all — the figure you see is the formula, not the answer. Extensions, transitional regimes and entity-specific exemptions are not reflected. Confirm with the registry before you rely on a date.
The Cayman Islands fix no statutory financial year for companies. The Companies Act sets no accounting date and requires no accounts to be filed with the Registrar, so the year end is the company's own choice. The International Tax Co-operation (Economic Substance) Act is built on that choice rather than on a statutory date: section 7(1)(d) requires a relevant entity carrying on a relevant activity to notify the Authority of «the date of the end of its financial year», and section 7(3) counts the reporting deadline «no later than twelve months after the last day of the end of each financial year of the relevant entity». Two clocks therefore run and must not be confused. The annual return and the annual fee do not depend on the financial year at all: they sit in the calendar, due in January, with the Registry's cut-off at the end of March. Only the economic substance report runs from the year the company has chosen, and until that year end is supplied no date for it exists.