Versions of s. 20.1(2)(a)
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in the case where the return is required to be made in accordance with subsection 20(1), the large taxpayer shall pay two instalments, each equal to one-half of the taxpayer’s instalment base for the month in which the tax was collected or became collectible, the first to be paid not later than the last day of that month and the second not later than the fifteenth day of the next following month; and