When to register, how often to file, when it's due, and the input tax credits owners most often miss in their first year.
Most businesses don't have to think about GST until their sales cross $30,000. After that, it's a registration, a return, and a set of deadlines that catch out a lot of first-year owners. Here is how it works in British Columbia.
You're a small supplier, and don't have to register, while your revenue from taxable supplies stays at or under $30,000 both in a single calendar quarter and over the last four consecutive calendar quarters. Once you go over, you must register.
Register online through Business Registration Online, which adds a GST/HST account to your Business Number (or creates one).
British Columbia doesn't use the HST. You charge the 5% federal GST, which you register for and file with the CRA, and, if your sales are subject to it, the separate 7% provincial PST, which is registered and filed with the Province. They are two registrations, two returns, and two sets of rules.
The CRA assigns your reporting period based on your annual taxable supplies. You can choose to file more often than assigned.
| Annual taxable supplies | Assigned period | Due |
|---|---|---|
| $1.5 million or less | Annual | 3 months after year-end |
| $1.5M to $6 million | Quarterly | 1 month after the quarter |
| Over $6 million | Monthly | 1 month after the month |
That April 30 payment date is the one most first-time filers miss. Filing in June doesn't stop interest on a balance that was due at the end of April.
Input tax credits (ITCs) get back the GST you paid on business purchases. You claim them on the return for the period you made the purchase, and you have up to four years to claim one you missed.
This summary is general information only, not tax advice. GST rules for specific goods and services, including exempt and zero-rated supplies, can change what you charge.


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