Paragraph 14 Value of a tax advantage
United Kingdom
The value of a tax advantage is the additional amount due or payable in respect of tax if the uncertain amount were the expected amount (subject to the following provisions of this paragraph).
The following are ignored in calculating the value of the tax advantage—
relief under Part 5 (group relief) or 5A (group relief for carried-forward losses) of CTA 2010, and
any relief under section 458 of CTA 2010 (relief in respect of repayment etc of loan) which is deferred under subsection (5) of that section.
To the extent that the tax advantage has the result that a loss is recorded for the purposes of corporation tax or income tax, and the loss has been wholly used to reduce the amount due or payable in respect of that tax, the value of the tax advantage is determined in accordance with sub-paragraph (1).
To the extent that the tax advantage has the result that a loss is recorded for the purposes of corporation tax or income tax, and the loss has not been wholly used to reduce the amount due or payable in respect of that tax, the value of the tax advantage is—
the value under sub-paragraph (1) of so much of the tax advantage as results from the part (if any) of the loss which is used to reduce the amount due or payable in respect of tax, and
10% of the part of the loss not so used.
To the extent that a tax advantage results in a loss recorded for the purposes of corporation tax or income tax, the value of it is nil where, because of—
the nature of the loss, or
the circumstances of the company or partnership that has brought the uncertain amount into account for tax purposes,
there is no reasonable prospect of the loss being used to support a claim to reduce a tax liability (of any person).