4(1)Capital gains tax chargeable on gains accruing—
(a)on the disposal of assets deemed to have been disposed of by a deceased person on his death, or
(b)on the disposal of settled property deemed to be effected on any occasion in accordance with subsection (3) or subsection (4) of section 25 of this Act,
being chargeable gains accruing—
(i)on the disposal of land or an estate or interest in land, or
(ii)on the disposal of shares or securities of a company the value of which at the time of the disposal is to be ascertained for the purposes of estate duty under section 55 of the [1940 c. 29.] Finance Act 1940 (valuation by reference to assets of the company) or the corresponding enactment forming part of the law of Northern Ireland, or would fall to be so ascertained if estate duty were leviable on the shares or securities on a death at the time of the disposal, or
(iii)where the Board are satisfied that the capital gains tax chargeable on gains accruing on the disposal of any shares or securities of a company not falling within paragraph (ii) above, and not quoted on a recognised stock exchange in the United Kingdom or elsewhere, cannot be paid at once without undue hardship, on the disposal of those shares or securities,
may, at the option of the personal representatives or as the case may be of the trustees, be paid by eight equal yearly instalments or sixteen half-yearly instalments, but subject to the payment of interest under sections 495 to 497 of the [1952 c. 10.] Income Tax Act 1952 as applied by this Schedule.
(2)The first instalment shall be due at the expiration of twelve months from the time of the disposal and the interest on the unpaid portion of the tax shall be added to each instalment and paid accordingly; but the tax for the time being unpaid, with interest to the date of payment, may be paid at any time and, if the property is disposed of for valuable consideration, shall become due and payable on the disposal.
(3)If relief is given under section 24(2) or section 25(5) of this Act in respect of an aggregate sum which includes gains to which this paragraph applies and other gains, then for the purpose of ascertaining the amount of capital gains tax chargeable on the gains to which this paragraph applies, that relief shall be treated as having been applied rateably in respect of tax on those respective gains.