CTM92460 | Corporation Tax self-assessment (CTSA): the payment obligation: repayment - intra-group surrender - joint notice
From HM Revenue & Customs · Company Taxation Manual
There is no prescribed form which companies must use to give a joint notice of surrender under CTA10/s963 (formerly FA89/s102). Although the notice can be in any form, it should show:
the name and tax reference of the surrendering company
the name and tax reference of the recipient company
the type and amount of each refund surrendered.
An authorised person on behalf of each company (see CTM93170) should sign the notice.
The company tax return can be used:
by the recipient company to record the amount which has been surrendered to it
by the surrendering company to record the amount it is surrendering.
Where such entries are made in a return a copy of the joint notice must be included as a PDF attachment. See the CT600 Guide for details of what entries should be made, and where.