When Do I Need to Register for GST/HST in Canada?
For many businesses, GST/HST registration becomes mandatory when taxable supplies exceed the small-supplier threshold. The timing matters because crossing the threshold in one calendar quarter can produce a different registration date than crossing it gradually over four consecutive calendar quarters.
The standard $30,000 threshold is widely quoted, but it is not the whole rule and it does not apply to every type of business.
The general small-supplier threshold
For most businesses, the CRA uses $30,000 in worldwide taxable supplies before expenses when determining whether the business remains a small supplier. If you exceed the threshold, registration can become mandatory.
How quickly did you cross the threshold?
If taxable supplies exceed $30,000 in a single calendar quarter, the registration timing can be immediate. If the threshold is exceeded over four consecutive calendar quarters, the business may remain a small supplier for a limited period before mandatory registration begins. Check the CRA examples for the exact effective date.
Rideshare and taxi operators are different
Commercial rideshare and taxi operators do not get the normal small-supplier exemption for that activity. The CRA requires GST/HST registration from the start of commercial rideshare/taxi operations.
Voluntary registration
A business below the mandatory threshold may sometimes choose to register voluntarily. That decision creates filing and collection responsibilities, so it should be made with a clear reason rather than simply because a customer asked for a GST/HST number.
After registration, bookkeeping matters
Once registered, the business needs to collect tax when required, track tax paid on eligible inputs, file returns on the correct frequency and remit balances on time.
FAQ
Is the GST/HST threshold based on profit?
No. The small-supplier test is based on taxable supplies before expenses, not net profit.
Does every business get the $30,000 exemption?
No. Some activities, including commercial ridesharing and taxi services, have special rules.
Can I register before I reach the threshold?
In some cases yes, but voluntary registration creates ongoing obligations.
Call to action
If you are close to the GST/HST threshold or already crossed it, GROWS Financial can help confirm the registration timing and set up the bookkeeping needed for ongoing returns.
Related services: GST/HST, Accounting & Bookkeeping.
Related reading: What Business Expenses Can I Claim as Self-Employed in Canada?
Official sources for fact-checking
Last reviewed: October 21, 2026.