1026. Subject to section 1026.1, every individual not contemplated in section 1025 shall pay to the Minister for each taxation year(a) on or before 15 March, 15 June, 15 September and 15 December in the year, an amount equal to one-quarter of his tax for the year estimated in accordance with section 1004, or of his basic provisional account, established in the prescribed manner for the preceding taxation year, or
(b) on or beforei. 15 March and 15 June in the year, an amount equal to one-quarter of his basic provisional account, established in the prescribed manner for the second preceding taxation year, and
ii. 15 September and 15 December in the year, an amount equal to one-half of the amount by which his basic provisional account, established in the prescribed manner, for the preceding taxation year, exceeds one-half of his basic provisional account, established in the prescribed manner, for the second preceding taxation year.