Your accounting reference date defaults to the last day of the month your company was incorporated in, one year on — the standard Companies House default. This tool uses that default; if you've shortened or extended your accounting period, treat the accounts and Corporation Tax dates below as approximate.
This tool doesn't send email reminders itself — instead, each deadline above has a button to download a calendar file (.ics) you can add to Google Calendar, Outlook, or Apple Calendar with your own reminder set. It assumes a standard 12-month accounting period and the default accounting reference date; if your company has changed its year end, filed early, or shortened a period, always check the actual dates on your Companies House record rather than relying on this alone. Missing a confirmation statement deadline can lead to the company being struck off, so treat that one as non-negotiable.
Running a limited company means keeping track of deadlines that don't line up with each other or with the tax year — a confirmation statement every 12 months, annual accounts on their own separate clock, and Corporation Tax filing and payment dates that follow your accounting period rather than the calendar. Missing the confirmation statement in particular carries a real risk: Companies House can eventually strike the company off the register for it, which is a far bigger problem than a late-filing fine.
This tool works out all four dates from your incorporation date in one go, tells you how much time you've actually got left on each, and gives you a calendar file for each one so you're not relying on memory (or this page) to catch them in time.
Companies House can start the process of striking your company off the register for failing to file, which — if it goes all the way through — closes the company and can affect your ability to be a director elsewhere. In practice they usually send reminders first, but it's not a deadline to treat casually the way a late-filing penalty might be.
Not quite — Companies House automatically sets it to the last day of the month in which the first anniversary of incorporation falls. So a company incorporated on 10 March has an accounting reference date of 31 March the following year, and every year after that. You can change it later, but most small companies keep the default.
No — they're separate obligations to separate bodies. Companies House wants your confirmation statement and annual accounts; HMRC wants your Corporation Tax return (CT600) and payment, based on your accounting period rather than your Companies House accounting reference date, though for most small companies these line up. You need to meet both sets of deadlines independently.