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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: unrelieved surplus ACT available for set off exhausted

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

From HM Revenue & Customs · Company Taxation Manual

The accounting period in which the shadow ACT is exhausted and after which no amount is available to be set against the company's liability to CT is referred to as the 'relevant accounting period'. The 'final accounting period' is the accounting period beginning in the period of twelve months immediately following the end of the relevant accounting period, or if there is more than one accounting period beginning in that period of twelve months, the latest of those accounting periods.

Example 1

A company’s total liability for the accounting period beginning on 1 January 2010 and ending on 31 December 2010 is £100,000 at 30 per cent. It makes no distribution. There is no surplus shadow ACT brought forward to that period and the unexhausted unrelieved surplus ACT is £20,000. In the accounting period covering the following twelve months it has a total liability of £200,000 at 30 per cent. It makes a distribution of £160,000. The amount of unrelieved surplus ACT that may be set-off against the liability for the accounting period ended 31.12. 2010 is calculated as follows:

  • Limit for set-off £20,000.

  • Less shadow ACT Nil.

  • Amount of unrelieved surplus ACT that can be set against liability £20,000.

  • The shadow ACT for the accounting period ended 31.12.2011 is £40,000. There is no shadow ACT to be carried back from the accounting period ended 31.12.2011.

  • Limit for set-off £40,000 – shadow ACT £40,000.

  • The accounting period ended 31.12.2011 is therefore the ‘final accounting period’.

Example 2

A company’s total liability for the accounting period beginning on 1 January 2010 and ending on 31 December 2010 is £100,000 at 30 per cent. It makes no distribution. There is no surplus shadow ACT brought forward to that period and the unexhausted unrelieved surplus ACT is £20,000. In the accounting period ended 31.12.2011 it has a total liability of £100,000 at 30 per cent. It makes a distribution of £160,000. The amount of unrelieved surplus ACT that may be set-off against the liability for the accounting period ended 31.12. 2010 is calculated as follows:

The shadow ACT to be carried back from the accounting period ended 31.12.2011 is:

  • Limit for set-off £20,000.

  • Less shadow ACT £40,000.

  • Carried back £20,000.

The shadow ACT carried back to the accounting period ended 31.12.2010 displaces the unrelieved surplus ACT set against the liability for that accounting period. The accounting period ended 31.12.2010 is revealed as not being ‘the relevant accounting period’ - the period in which the unrelieved surplus ACT was finally exhausted. As a result, the accounting period ended 31.12.2011 is not the final accounting period and the regulations continue to apply.

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