Versions of s. 79.1(3)
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A person, other than a large taxpayer, who is required under subsection 79(1) or (3) to file a return and pay tax in respect of a fiscal month or other period authorized under subsection 79(2) shall, not later than 21 days after the end of the month or period, as the case may be, pay an instalment on account of the tax equal to the person's instalment base for the month or period.