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Change your company accounting reference date (AA01)

Use this form to change an accounting reference date relating to either the current or immediately previous accounting period.

Updates to this page

From:
Companies House
Published:
18 September 2014
Last updated:
17 September 2026
Show all updates

  1. Added wording for overseas companies with a UK establishment. They must send the paper form by post to the correct Companies House office.

  2. We've stopped sending paper letters to confirm when your accounting reference date has changed.

  3. We’re stopping sending paper letters to confirm when your accounting reference date has changed. You can check your new accounting reference date by searching for your company on our Find and update company information service.

  4. Form updated following the end of Brexit transition.

  5. Planned maintenance notice removed.

  6. Message added: Due to essential maintenance Companies House online services will be unavailable between Saturday 16 April 2016 and Sunday 17 April 2016. Please accept our apologies for any inconvenience this may cause. You’ll still be able to file with HMRC.

  7. Online filing option added

  8. First published.

Documents

Change your accounting reference date online

https://idam-ui.company-information.service.gov.uk/

AA01 change of accounting reference date

PDF, 184 KB, 3 pages

Details

Use this form to change an accounting reference date. It must be received within the period allowed for laying and delivering the accounts for the current or the immediately previous accounting reference period.

Use the online service to update your information as quickly as possible. It takes longer to process paper forms sent to us by post.

If you’re filing this form for an overseas company with a UK establishment, you must send the paper form by post to the correct Companies House office.

We’ve stopped sending paper letters to confirm when your accounting reference date has changed. You can search for your company to check your new accounting reference date.

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