The UK company filing calendar: every deadline a Gulf director must track

The most common misconception Gulf directors hold about UK company compliance is that deadlines are calendar-based — that everything falls due in January, or at the UK tax year end in April, or at some shared annual point. They don't. Almost every UK company filing deadline is tied to your company's specific dates: when it was incorporated, when its accounting year ends, when it last filed. Two companies registered in the same month can have entirely different filing schedules.

Annual accounts are due nine months after the end of your company's accounting year. If your financial year runs from 1 April 2025 to 31 March 2026, your accounts are due with Companies House by 31 December 2026 — not at any common year-end date. For newly incorporated companies, the first set of accounts covers the period from incorporation to the chosen year-end date, and the deadline is calculated from there. Miss this deadline and the late filing penalty clock starts immediately.

The confirmation statement has a separate deadline entirely. It's due within 14 days of the anniversary of your company's incorporation date — every year, regardless of whether you've traded. If your company was incorporated on 7 June 2022, your confirmation statement is due by 21 June each year. There is no invoice, no automated reminder from Companies House, and no grace period — one day late and the £500 penalty is issued.

Corporation tax adds two more dates to track. The CT600 return is due 12 months after your accounting period ends. But the tax payment itself is due 9 months and 1 day after the period ends — a month earlier than the return. If your year ends 31 March 2026, you must pay corporation tax by 1 January 2027 and file the CT600 by 31 March 2027. Missing the payment date means HMRC charges daily interest. Directors who assume both are due at the same time routinely pay late.

Director ID verification adds a fifth deadline — personal to your confirmation statement due date. If your confirmation statement falls due in September, that's when your verification must be complete. The practical implication: if you haven't yet verified, don't wait for November. Your deadline may already have passed or be weeks away. Every Fileminder client receives their full personal deadline schedule on onboarding — a set of specific dates, not approximate months.