“Schedule 1A to this Act shall apply as respects any claim or election which - (a) is made otherwise than by being included in a return under section 8, 8A or 12AA of this Act …”
“Schedule 1B to this Act shall have effect as respects certain claims for relief involving two or more years of assessment.”
“(1) For the purpose of establishing the amounts in which a person is chargeable to income tax and capital gains tax for a year of assessment, and the amount payable by him by way of income tax for that year, he may be required by a notice given to him by an officer of the Board - (a) to make and deliver to the officer … a return containing such information as may reasonably be required in pursuance of the notice, and (b) to deliver with the return such accounts, statements and documents, relating to information contained in the return, as may reasonably be so required. … (1AA) For the purposes of subsection (1) above - (a) the amounts in which a person is chargeable to income tax and capital gains tax are net amounts, that is to say, amounts which take into account any relief or allowance a claim for which is included in the return; and (b) the amount payable by a person by way of income tax is the difference between the amount in which he is chargeable to income tax and the aggregate amount of any income tax deducted at source and any tax credits to which section 231 of the principal Act [ie ICTA] applies.”
“(1B) In the case of a person who carries on a trade, profession, or business in partnership with one or more other persons, a return under this section shall include each amount which, in any relevant statement, is stated to be equal to his share of any income, loss, tax, credit or charge for the period in respect of which the statement is made. (1C) In subsection (1B) above ‘relevant statement’ means a statement which, as respects the partnership, falls to be made under section 12AB of this Act for a period which includes, or includes any part of, the year of assessment or its basis period.”
“every return under section 8 or 8A of this Act shall include a self-assessment, that is to say - (a) an assessment of the amounts in which, on the basis of the information contained in the return and taking into account any relief or allowance a claim for which is included in the return, the person making the return is chargeable to income tax and capital gains tax for the year of assessment …”
“Where any amounts contained in a partnership statement are reduced under subsection (6) above or increased under subsection (7) above, an officer of the Board shall by notice to each of the relevant partners amend - (a) the partner’s return under section 8 … of this Act or (b) the partner’s company tax return, so as to give effect to the reductions or increases of those amounts.”