Why this matters.
The Economic Crime and Corporate Transparency Act 2023 gives Companies House new powers over how accounts are filed. On 23 October 2026 the government confirmed that, from 1 April 2028, every UK company must file its annual accounts in iXBRL format using commercial software, whether it files itself or through an accountant. WebFiling and paper filing for accounts close on that date, although WebFiling stays open for other filings such as confirmation statements and director changes. From the same date, all parts of the accounts must be filed together, directors claiming audit exemption must give a strengthened eligibility statement, and there will be a limit on how often a company can shorten its accounting reference period. The original start date of April 2027 has been dropped.
The government has paused the plan to make small companies and micro-entities file their profit and loss account, so you can still file abridged accounts and leave out (“fillet”) the profit and loss account after 1 April 2028. Late filing still carries automatic penalties under section 453 of the Companies Act 2006, from £150 to £1,500 for private companies, doubled if you are late two years running, and the company can be struck off. Many small companies file through WebFiling themselves or rely on an accountant without knowing which software they use. Checking now leaves time to choose software, brief your accountant and plan your first year-end after the change.