For the purpose of computing the payments that a cooperative referred to in the first paragraph is required to make under subparagraph a of the first paragraph of section 1027, or any of sections 1159.7, 1175 and 1175.19 where they refer to that subparagraph a, the cooperative is deemed to have paid to the Minister, on account of the aggregate of the cooperative’s tax payable for the year under this Part and of the cooperative’s tax payable for the year under Parts IV.1, VI and VI.1, on the date on or before which each payment is required to be made, an amount equal to the lesser of(a) the amount by which the amount determined under the first paragraph for the year exceeds the aggregate of all amounts each of which is the portion of the amount that may reasonably be considered to be deemed to have been paid to the Minister under this paragraph in the year but before that date; and
(b) the amount by which the amount of that payment, determined without reference to this chapter, exceeds the aggregate of all amounts each of which is an amount that is deemed, under this chapter but otherwise than under the first paragraph, to have been paid to the Minister on that date, for the purpose of computing that payment.