@Meteor , thanks for your detailed explanation :) To have an ABN...

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    @Meteor , thanks for your detailed explanation

    To have an ABN would help confirm your "intention" to carry on a share trading business, but is not essential.
    Substance overrides form.

    If he/she has trading losses to claim, it's better off registering an ABN. The ABN can be easily registered retrospectively via ABR website.
 
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