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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: immediate opt out

CTM18400 | Shadow ACT: accounting periods to which the Regulations apply: company not a member of a group: immediate opt out

From HM Revenue & Customs · Company Taxation Manual

SI1999/358 Reg4 (3)

There are some companies where the amount of the unrelieved surplus ACT is so small or their prospects of accessing it are so uncertain that they would prefer not to have to bother with the regulations.

Provision is made for such companies to opt out. If they wish to do so, they must notify an officer of HMRC before the end of the first accounting period beginning on or after 6 April 1999 that they will not seek recovery of any unrelieved surplus ACT in that or any subsequent period (immediate opt out).

The regulations will not apply to a company that has given notification for at least as long as it remains a company that is not a member of a group. They will begin to apply if the company becomes a member of a group at least one other member of which had unrelieved surplus ACT at 6 April 1999 and has not passed its final accounting period in its capacity as a member of that group.

Where that happens, the regulations are applied from that accounting period. The company cannot set off the unrelieved surplus ACT that it opted to forgo. The group can make use of its shadow ACT capacity. Any distributions it makes are taken into account in computing the shadow ACT available to cover its capacity and that of the other members of the group.

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