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.



This form can be used 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.

It is easier and quicker to file your AA01 online.

Published 18 September 2014
Last updated 19 April 2016 + show all updates
  1. Planned maintenance notice removed.
  2. 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.
  3. Online filing option added
  4. First published.