When does your business need to register for GST/HST?
The $30,000 small supplier threshold explained, plus what changes once you start charging tax.
July 21, 2026 · 1 min read
Most businesses in Canada must register for GST/HST once their taxable sales pass $30,000 over four consecutive calendar quarters. Below that, you are a small supplier and registration is optional.
Watch the threshold closely: you have to register within 29 days of the day you go over it, and you must charge tax on the sale that pushed you past the limit.
Registering early can make sense even below the threshold. You can claim input tax credits on what you buy for the business, such as tools, software and a share of your phone bill.
Once registered, show your GST/HST number on invoices and file returns on time, even for periods with no sales. On CEADC, add your number in Settings so it appears on your receipts.
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