Registering for a number will facilitate trade with suppliers who, for tax reasons, require that they provide a business number of their clients. Also, having a number will permit one to gain tax credits for off-reserve business, where tax credits would otherwise be lost. But these are only general advantages.
Since there are only a few scenarios in which one has a choice whether to register or not, this becomes a question of which form of business organization one wishes to pursue. Please refer to the answer to question 5.
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