682Ascertainment of undistributed income
(1)For the purposes of this Chapter, income arising under a settlement in any year of assessment shall be deemed not to have been distributed if and to the extent that it exceeds the aggregate amount of—
(a)the sums, excluding all payments of interest, paid in that year by the trustees of the settlement to any persons (not being a body corporate connected with the settlement and not being the trustees of another settlement made by the settlor or the trustees of the settlement) in such manner that they fall to be treated in that year, otherwise than by virtue of section 677, as the income of those persons for the purposes of income tax, or would fall to be so treated if those persons were domiciled, resident and ordinarily resident in the United Kingdom and the sums had been paid to them there, and
(b)subject to subsections (2) to (5) below, any expenses of the trustees of the settlement paid in that year which, in the absence of any express provision of the settlement, would be properly chargeable to income, in so far as such expenses are not included in the sums mentioned in paragraph (a) above, and
(c)in a case where the trustees of the settlement are trustees for charitable purposes, the amount by which any income arising under the settlement in that year in respect of which exemption from tax may be granted under section 505 exceeds the aggregate amount of any such sums or expenses as are mentioned in paragraphs (a) and (b) above paid in that year which are properly chargeable to that income.
(2)Subsection (1)(b) above shall apply to any interest paid by the trustees of the settlement subject to subsections (3) to (6) below.
(3)If no sums within subsection (1)(a) were paid to any person other than the settlor, or the wife or husband of the settlor, the whole of any interest paid by the trustees of the settlement shall be excluded from subsection (1)(b) above.
(4)If any sum was so paid, there shall be excluded from subsection (1)(b) above a fraction—
of any interest paid by the trustees of the settlement where—
A is the whole of the income arising under the settlement in the year of assessment, less the sums referred to in subsection (1)(b) above apart from subsections (2), (3) and (5) of this section; and
B is so much of the sums within subsection (1)(a) above as is paid to persons other than the settlor, or the wife or husband of the settlor.
(5)Subsections (2) to (4) above shall not apply to interest in respect of which relief from tax is allowable under any provision of the Income Tax Acts or to interest payable to the settlor or the wife or husband of the settlor if living with the settlor.
(6)Nothing in subsections (2) to (5) above shall be construed as affecting the liability to tax of the person receiving or entitled to the interest.