Commercial law, litigation, contracts, IP, property law
Isnt that the same question? a person cannot use a business name registered to another trader unless he has the permission of that trader if not he is on breach of the business names act.
As far as an abn goes he needs an abn in his name unless he is under the earning threshold which is about $70K
It is not legal to use another persons abn or the abn of another business. That is a breach of the tax act