ITAA 1997 s 17-5(a) and section 6-23

Income tax: must an outgoing incurred by a supplier in deriving income from a taxable supply be apportioned when calculating the deduction allowable for the outgoing under section 8-1 of the Income Tax Assessment Act 1997, because some amount of the income relates to GST payable on a taxable supply, and is non-assessable non-exempt income?

Income tax: must an outgoing incurred by a supplier in deriving income from a taxable supply be apportioned when calculating the deduction allowable for the outgoing under section 8-1 of the Income Tax Assessment Act 1997, because some amount of the income relates to GST payable on a taxable supply, and is non-assessable non-exempt income?