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GST/HST Explained for Canadian Small Businesses
Understand the federal registration threshold, voluntary registration obligations, and the records you need before charging GST/HST.
Quick answer
Most businesses making taxable supplies in Canada must register for GST/HST once they cease to be a small supplier. The standard small-supplier threshold is more than $30,000 in a single calendar quarter or over four consecutive calendar quarters, with timing rules that affect when you start charging. Registering voluntarily is possible, but it creates filing and remittance obligations.
Sources: Canada Revenue Agency, Canada Revenue Agency
The $30,000 threshold is based on taxable supplies, not profit
CRA says most businesses are small suppliers when they do not exceed the $30,000 threshold over four consecutive calendar quarters. The calculation is based on revenues from taxable supplies, not on net income after expenses.
If you exceed $30,000 in one calendar quarter, you generally must charge GST/HST on the supply that puts you over and register no later than that day. The rule is different when the threshold is exceeded across the preceding four quarters, so check the CRA timing table rather than waiting for year-end.
Sources: When to register for and start charging the GST/HST
Voluntary registration is a business obligation, not a cosmetic choice
A small supplier making taxable supplies can generally register voluntarily. Once registered, CRA says you must charge, collect, and remit applicable GST/HST, file returns regularly, and normally remain registered for at least one year before cancelling.
Do not charge a tax amount simply because it appears on a competitor’s invoice. Confirm registration, the supply type, and the rate before changing your invoicing system.
Sources: Register voluntarily for a GST/HST account, When to register for and start charging the GST/HST
Separate the money and the records from day one
GST/HST collected is not operating revenue you can freely spend. Keep invoice records, track tax collected and eligible input tax credits separately, and reconcile the amounts before each filing period.
CRA requires business records that support income and expense claims. Good records also make it easier to determine when taxable-sales thresholds are being approached.
Sources: CRA guide T4002: business records, When to register for and start charging the GST/HST
Sources checked 15 July 2026
Primary documentation used for this guide. Product terms, prices, and government rules can change, so follow the linked source for the current version.
- When to register for and start charging the GST/HST · Canada Revenue Agency
- Register voluntarily for a GST/HST account · Canada Revenue Agency
- CRA guide T4002: business records · Canada Revenue Agency