(1) A * non-resident is not required to give a * GST return for a tax period if:
(a) the non-resident's * net amount for the tax period is zero; or
(b) the only * taxable supplies or * taxable importations that the non-resident made that are attributable to the tax period are taxable supplies or taxable importations made through a * resident agent.
(2) This section has effect despite section 31-5 (which is about who must give GST returns).