When to file iXBRL?

Timelines for iXBRL filing with HMRC and Companies House

Every business entity that is required to file their corporation tax returns must prepare, after the end of its financial year:

  • full statutory annual accounts
  • a Company Tax Return

You have different deadlines for sending your accounts to Companies House and your tax return to HMRC, but you may be able send them at the same time. If your company is small, a micro entity or dormant, you might be able to send simpler (‘abridged’) accounts.

You need your accounts and tax return to meet deadlines for filing with Companies House and HM Revenue and Customs (HMRC).

The table below sets out the deadline for different filings :

Action Deadline
File first accounts with Companies House 21 months after the date you registered with Companies House
File annual accounts with Companies House 9 months after your company’s financial year ends
Pay Corporation Tax or tell HMRC that your limited company does not owe any 9 months and 1 day after your ‘accounting period’ for Corporation Tax ends
File a Company Tax Return 12 months after your accounting period for Corporation Tax ends

Your accounting period for Corporation Tax is the time covered by your Company Tax Return. It’s normally the same 12 months as the company financial year covered by your annual accounts.


Filing your accounts and tax return

You can file with Companies House and HMRC together or separately. Additional steps are required

  • at the end of your company’s first year
  • if you restart a dormant company

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