Substantial interest thresholds turn on beneficial voting power or profit entitlement, with related-person aggregation applying for specified concerns.

Substantial interest is based on beneficial ownership of qualifying company shares carrying at least 20% voting power or beneficial entitlement to at least 20% of profits in a non-company concern. Fixed-dividend shares are excluded from the qualifying shareholding. For specified NPO and charitable-trust contexts, the relevant ownership or profit entitlement may be aggregated with that of related or relevant persons. The same threshold applies to a business or profession carried on by a company or otherwise.

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