(1)Subject to subsections (2) and (3) below, in the computation of the gain accruing on the disposal by any person of any deep discount securities (within the meaning of Schedule 4 to the Taxes Act)—
(a)section 37 shall not apply but the consideration for the disposal shall be treated as reduced by the amount mentioned in paragraph 4(1)(a) of that Schedule (including any amount mentioned in paragraph 3 of that Schedule); and
(b)where that amount exceeds the consideration for the disposal, the amount of the excess shall be treated as expenditure within section 38(1)(b) incurred by that person on the security immediately before the disposal.
(2)Subsection (3) below applies where—
(a)there is a conversion of securities to which section 132 applies and those securities include deep discount securities; or
(b)securities including deep discount securities are exchanged (or by virtue of section 136(1) are treated as exchanged) for other securities in circumstances in which section 135(3) applies.
(3)Where this subsection applies—
(a)subsection (1) and section 37 shall not apply but any sum payable to the beneficial owner of the deep discount securities by way of consideration for their disposal (in addition to his new holding) shall be treated for the purpose of the computation of the gain as reduced by the amount of the accrued income on which he is chargeable to tax by virtue of paragraph 7(3) of Schedule 4 to the Taxes Act or, in a case where paragraph 3 of that Schedule applies, on which he would be so chargeable if that paragraph did not apply; and
(b)where that amount exceeds any such sum, the excess shall be treated as expenditure within section 38(1)(b) incurred by him on the security immediately before the time of the conversion or exchange.
(4)Where a disposal of a deep discount security is to be treated for the purposes of this Act as one on which neither a gain nor a loss accrues to the person making the disposal, the consideration for which the person acquiring the security would, apart from this subsection, be treated for those purposes as having acquired the security shall be increased by the amount mentioned in paragraph 4(1)(a) of Schedule 4 to the Taxes Act (including any amount mentioned in paragraph 3 of that Schedule).
(5)Where by virtue of paragraph 18(3) of Schedule 4 to the Taxes Act trustees are deemed for the purposes of that Schedule to dispose of a security at a particular time—
(a)they shall be deemed to dispose of the security at that time for the purposes of this Act, and
(b)the disposal deemed by paragraph (a) above shall be deemed to be at the market value of the security.
(6)Where by virtue of paragraph 18(4) of Schedule 4 to the Taxes Act trustees are deemed for the purposes of that Schedule to acquire a security at a particular time—
(a)they shall be deemed to acquire the security at that time for the purposes of this Act, and
(b)the acquisition deemed by paragraph (a) above shall be deemed to be at the market value of the security.