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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: company not a member of a group: later opt out

CTM18450 | Shadow ACT: accounting periods to which the Regulations apply: company not a member of a group: later opt out

From HM Revenue & Customs · Company Taxation Manual

A company may notify an officer of HMRC at any time in an accounting period that it wishes that accounting period to be its final accounting period and that it will not seek recovery of unrelieved surplus ACT in respect of any subsequent accounting period (later opt out).

Where such a notification is made, the accounting period in which it is made is the final accounting period unless:

  • there is an amount of surplus shadow ACT in respect of an accounting period beginning in the twelve months immediately following the end of the accounting period in which the notification is made or, if there is more than one, the latest accounting period, and

  • that amount or part of it falls to be carried back to the accounting period in which the notification is made,

in which case, that accounting period is the final accounting period.

Example 1

The company’s total liability for the accounting period of twelve months ending on 31.12.2005 is £200,000 at 30 per cent. No distribution is made during the accounting period and there is no surplus shadow ACT brought forward. v There is unrelieved surplus ACT of £40,100. The company opts out during the period.

Its total liability for the next accounting period ending on 31.12.2006 is £100,000 at 30 per cent. It makes a distribution of £80,000. The shadow ACT generated is £20,000, which matches its capacity in that period. There is no surplus shadow ACT so the final accounting period is that ending on 31.12.2005 and the unrelieved surplus ACT forgone is £100.

Example 2

The facts are the same as in Example 1 except that the distribution is £100,000.

The shadow ACT is £25,000 and the capacity £20,000 so £5,000 falls to be carried back to the accounting period in which the notification was made.

The final accounting period is the accounting period ending on 31.12.2006. The unrelieved surplus ACT that can be set against the CT liability for the accounting period ending on 31.12.2005 is £35,000. The unrelieved surplus ACT forgone is surplus ACT forgone is therefore £5,100.

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