You can register directly on Founded by clicking on 'Organization' and then 'Company Info':

You can also register directly online with the Government of Canada for GST/HST.

After you register, you must begin charging GST/HST to your clients.

Already have an old GST/HST Number? 

If you already have a GST/HST number for your Sole Proprietorship or Partnership, you'll need to get a new account now that you've incorporated. 

This is because your old GST/HST number is attached to you as a sole proprietor / partnership.

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