(1) With effect from the day appointed by the Minister for Finance in accordance with the provisions of subsection (2), the Principal Act is amended -
(a) by substituting the following for section 865:
"865. Repayment of tax.
(a) In this section and section 865A -
the 'Acts' means the Tax Acts and the Capital Gains Tax Acts and instruments made thereunder;
'chargeable period' has the meaning assigned to it by section 321;
'correlative adjustment' means an adjustment of profits under the terms of arrangements entered into by virtue of section 826;
'tax' means any tax, including interest thereon, paid by a person under or in accordance with any provision of the Acts;
'valid claim' shall be construed in accordance with paragraph (b).
(b) For the purposes of subsection (3) -
(i) where a person furnishes a statement or return which is required to be delivered by the person in accordance with any provision of the Acts for a chargeable period, such a statement or return shall be treated a
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