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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: utilisation of: Double Taxation Relief

CTM18670 | Shadow ACT: utilisation of: Double Taxation Relief

From HM Revenue & Customs · Company Taxation Manual

SI1999/358 reg12 (4)

Where foreign tax falls to be allowed in accordance with TIOPA10/S42 the limit is calculated in that way only in relation to so much of the profits as do not include income or gains in respect of which relief for foreign tax is due (the relevant income or gain).

As far as the 'relevant income or gains' are concerned, the limit is the lesser of

  • the limit calculated as described, on the basis that the relevant income or gain were the company's only income or gain for the relevant accounting period, and

  • the amount of CT for which, after taking account of the reduction for foreign tax, the company is liable in respect of that income or gain.

Example 1

  • The company’s total liability is £100,000 at 30 per cent = £30,000.

  • There is no foreign income or gains.

  • It has unrelieved surplus ACT to use of £50,000.

  • It has no shadow ACT brought forward.

  • It has paid a dividend of £60,000.

  • Its capacity is £20,000.

  • Shadow ACT to be set against that capacity = £15,000.

  • Set off of unrelieved surplus ACT £5,000.

Example 2

  • Income or gains in respect of which foreign tax due (relevant income or gains) £100,000.

  • Other income or gains £200,000.

  • Foreign tax to be set against CT liability £25,000.

Capacity

  • Relevant income or gains: the lesser of amount of shadow ACT treated as paid on a distribution which, together with shadow ACT thereon, is equal to relevant income or gains (£100,000) £20,000.

CT on relevant income or gains (£100,000)£30,000
Less foreign tax£25,000
Leaves£5,000
Plus amount of ACT treated as paid on distribution which, together with ACT thereon, is equal to other income or gains£40,000
Total£45,000
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