In Canada, it is not mandatory for a small business to open an HST or GST account until their revenues reach:

Name: In Canada, it is not mandatory for a small business to open an HST or GST account until their revenues reach:
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In Canada, a small business is not required to register for an HST (Harmonized Sales Tax) or GST (Goods and Services Tax) account until their annual gross revenues reach $30,000. This is known as the small supplier threshold.

In Canada, It Is Not Mandatory for a Small Business