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Official guidance
Company Taxation Manual

CTM18000 · Shadow ACT to 31 March 2026

  • CTM18200 · Shadow ACT: set-off of ACT: accounting periods ending on or before 5 April 1999
  • CTM18210 · Shadow ACT: set-off of ACT: accounting periods beginning before and ending after 5 April 1999
  • CTM18220 · Shadow ACT: set-off of ACT: accounting periods beginning on or after 6 April 1999
  • CTM18230 · Shadow ACT: unrelieved surplus ACT
  • CTM18250 · Shadow ACT: outline of the scheme
  • CTM18260 · Shadow ACT: companies to which the regulations apply
  • CTM18300 · Shadow ACT: definition of a group
  • CTM18320 · Shadow ACT: definition of parent and subsidiary companies
  • CTM18350 · Shadow ACT: definition of a group: additional tests for 51% subsidiaries
  • CTM18360 · Shadow ACT: definition of a group: additional tests for parent companies
  • CTM18370 · Shadow ACT: definition of a group: arrangements
  • CTM18400 · Shadow ACT: accounting periods to which the Regulations apply: company not a member of a group: immediate opt out
  • CTM18420 · Shadow ACT: accounting periods to which the Regulations apply: company not a member of a group: no immediate opt out
  • CTM18430 · Shadow ACT: accounting periods to which the Regulations apply: company not a member of a group: unrelieved surplus ACT available for set off exhausted
  • CTM18450 · Shadow ACT: accounting periods to which the Regulations apply: company not a member of a group: later opt out
  • CTM18470 · Shadow ACT: accounting periods to which the Regulations apply: group members
  • CTM18480 · Shadow ACT: accounting periods to which the Regulations apply: group members: immediate opt out
  • CTM18500 · Shadow ACT: accounting periods to which the Regulations apply: group members: unrelieved surplus ACT available for set off exhausted
  • CTM18510 · Shadow ACT: accounting periods to which the Regulations apply: group members: later opt out
  • CTM18550 · Shadow ACT: computation of: introduction
  • CTM18570 · Shadow ACT: computation of: subsidiary with election under Regulation 11(3)
  • CTM18580 · Shadow ACT: computation of: surplus franked investment income
  • CTM18590 · Shadow ACT: computation of: distributions outside an accounting period
  • CTM18600 · Shadow ACT: computation of: company ceasing to be a member of a group
  • CTM18650 · Shadow ACT: utilisation of: overview
  • CTM18670 · Shadow ACT: utilisation of: Double Taxation Relief
  • CTM18680 · Shadow ACT: utilisation of: carry back
  • CTM18700 · Shadow ACT: utilisation of: allocation of surplus within groups
  • CTM18710 · Shadow ACT: utilisation of: companies leaving and joining a group
  • CTM18720 · Shadow ACT: unrelieved surplus: set-off
  • CTM18730 · Shadow ACT: unrelieved surplus: restriction on set- off of arising as the result of a surrender
  • CTM18750 · Shadow ACT: unrelieved surplus: ACT buying
  • CTM18760 · Shadow ACT: unrelieved surplus: change of ownership of company
  • CTM18770 · Shadow ACT: unrelieved surplus: asset transferred after change in ownership of company
  • CTM18800 · Shadow ACT: unrelieved surplus: recovery of ACT wrongly set off
  • CTM18810 · Shadow ACT: unrelieved surplus: displacement of
  • CTM18850 · Shadow ACT: controlled foreign companies liabilities
  1. Shadow ACT to 31 March 2026: contents
  2. Shadow ACT: accounting periods to which the Regulations apply: group members: later opt out

CTM18510 | Shadow ACT: accounting periods to which the Regulations apply: group members: later opt out

From HM Revenue & Customs · Company Taxation Manual

SI1999/358 reg5 (9), (10), and (11)

There is provision for a parent company to notify an officer of HMRC that the group will not seek further recovery of any unrelieved surplus ACT. That allows groups to relieve themselves of the burden of applying the regulations where the amount for which relief might be obtained is, in their view, insufficient to justify the effort or they see little or no prospect of accessing it in the foreseeable future.

Such a notification is binding on each company that was a member of the group when the notification was made or that became a member of the group subsequently but before the end of the parent company's final accounting period (AP).

The final AP is the one in which the notification is made except where

  • there is an amount of surplus shadow ACT in respect of an AP of a group member beginning in the twelve months (the relevant period) immediately following the end of the AP of the parent in which the notification was made, and

  • all or part of which falls to be carried back to an AP ending before the relevant period,

in which case, it is the latest AP in the relevant period from which surplus shadow ACT is carried back to an AP ending before the relevant period.

Where:

  • the notification is made in an AP of a company that is not coterminous with that of the parent company, and

  • the AP of the parent company in which notification was made is the parent company's AP,

the other company is treated as having two APs, the first of which ended on the last day of the parent company's final AP and that notional AP is treated as its final AP.

A company with unrelieved surplus ACT, which has not reached its final AP, could become grouped with a company or companies covered by an immediate opt out under reg5 (3). When that occurs, that company or those companies are treated as if no notification had been made but they are not allowed to access the unrelieved surplus ACT they agreed to forgo.

There is a similar provision to deal with cases where the 'final accounting period' has been determined under reg5 (1), (5), (7) or (8).

A company can be the member of more than one group. For example, if Company A held 51 per cent of the shares in Company B which held 51 per cent of the shares in Company C, Company B would be a member of the Company A group but also the parent company and therefore a member of the group consisting of itself and Company C. When a company is a member of more than one group and its final accounting period for at least one has been determined as a result of a notification under reg5 (5), it is treated in relation to any other group of which it is a member as if its unrelieved surplus ACT had already been relieved in full.

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