HMRC's online service for company accounts and the Company Tax Return closed on 31 March 2026. A company now files with commercial software. Submit files the annual accounts at Companies House.
What closed
The 'File your accounts and Company Tax Return' service of HMRC closed on 31 March 2026. GOV.UK says what to use instead.
The ‘File your accounts and Company Tax Return’ online service closed on 31 March 2026. From 1 April 2026 you should use commercial software to file annual accounts and Company Tax Returns with HMRC.
What a company does now
- File the annual accounts with Companies House. Submit does this for micro-entity accounts, small company accounts and dormant company accounts.
- File the Company Tax Return (CT600) with HMRC through commercial software.
When each is due
The accounts and the Company Tax Return have separate deadlines.
File annual accounts with Companies House 9 months after your company’s financial year ends
The deadline for your tax return is 12 months after the end of the accounting period it covers.
What Submit files
Every filing and the channels that offer it are in the availability table.
Submit files annual accounts at Companies House.
Submit's Company Tax Return (CT600) filing awaits HMRC recognition. Until then it runs on our simulator only and files nothing.