Restriction on commercial activities by non-profit organisations: permitted only when ancillary, within a limited share of receipts, and separately accounted. Clause 346 conditions commercial activities by a registered non-profit advancing a public utility object on three requirements: the activity must be undertaken in the course of actually advancing that object; aggregate receipts from such activity must not exceed a capped proportion of the organisation's total receipts for the relevant tax year; and separate books of account must be maintained for those activities.