IT company calendar
Dates that matter for an IT company in the United Kingdom: Companies House and HMRC deadlines, tax year checkpoints and key industry events. The calendar is kept up to date; every line links to its source.
1
PRESENTFUTUREPAST
Updated: 2026-09-26
Standing rules and windows
At least once a year, within 14 days after the end of your review period. Filed with Companies House. source →
Nine months after your company's financial year end, to Companies House. source →
Payment is due 9 months and 1 day after the end of the accounting period; the CT600 return — within 12 months. source →
Usually quarterly under Making Tax Digital: filing and payment 1 month and 7 days after the quarter ends. source →
A claim can be made up to 2 years after the end of the accounting period; first-time claimants must send a claim notification within 6 months after the period ends. source →
Filing dates follow the general rules — the exact set depends on your company’s setup.