When to Register for GST/HST in Canada: The $30,000 Tests Explained

“Do I register after $30,000?” is a good starting question. But the rule is not about $30,000 of annual profit. Goods and services tax (GST) and harmonized sales tax (HST) use small-supplier tests based on taxable supplies, the sales and services that count under the rules. Check these by calendar quarter. Going over the limit in one quarter can lead to a different registration date from going over it across several quarters.

This guide uses made-up examples with future dates to explain ordinary situations. It is not personal tax advice. Check the current Canada Revenue Agency (CRA) guidance and Revenu Québec guidance where applicable. Special businesses, public service bodies, non-residents and other situations can have different rules.

1. Identify the supplies included in the test

The ordinary $30,000 test generally counts worldwide revenue from taxable supplies. That includes zero-rated supplies, which are taxable at a zero rate, and the relevant revenue of associates. “Associates” has a specific meaning under the tax rules; check who must be included. Do not subtract expenses as you would for profit or count only deposits in one bank account. CRA guidance excludes some amounts, such as financial services, sales of capital property (long-term business assets) and goodwill included in a business sale.

Classify the supplies before calculating. Taxable, zero-rated and exempt are not interchangeable labels. A deposit, loan or transfer also should not automatically be treated as taxable sales. Review all relevant activities and associates rather than splitting the same business across invoices or accounts to make each subtotal look smaller.

Exactly $30,000 is different from exceeding $30,000 under the ordinary threshold test. However, a special mandatory-registration rule can apply independently of that ordinary boundary.

2. Check whether one quarter exceeds the threshold

Consider a fictional unregistered business with no associates and only ordinary taxable services. It makes $10,000 of relevant supplies in April 2027, $11,000 in May, then a $10,000 supply on June 10. Its total for that calendar quarter becomes $31,000.

Under this single-quarter illustration, the business stops being a small supplier on the supply that takes it over the threshold. Its required registration effective date is no later than June 10. GST/HST applies to the supply that crosses the threshold, not merely to the $1,000 above $30,000. The CRA states that registration must occur within 29 days of the effective date.

Do not wait until year-end or assume tax starts with the next invoice. If the crossing supply has already been invoiced incorrectly, ask an adviser how to address the registration, pricing, tax and customer documentation based on the actual facts.

3. Apply the different cumulative-quarter timeline

Now take another fictional business with $8,000 of relevant supplies in each of four consecutive calendar quarters: October–December 2026, January–March 2027, April–June 2027 and July–September 2027. The total reaches $32,000 at September 30, without any individual quarter exceeding $30,000.

Original cumulative example — ordinary assumptions only

Milestone	Consequence
September 30, 2027	Four-quarter total exceeds $30,000
October 31, 2027	Small-supplier status ends at the end of the following month
Next taxable supply: November 5	Latest required effective date in this example is November 5

Tax must be charged starting on the registration effective date; registration is required within 29 days of that date. These examples assume no voluntary earlier registration or special rule. Calendar quarters are fixed calendar periods, not four arbitrary three-month blocks selected from the banking history.

4. Check exceptions, voluntary registration and Quebec

Some activities require registration even when the ordinary small-supplier threshold is not exceeded, including taxi and commercial ride-sharing services under the applicable rules. Public service bodies and particular non-resident or digital-economy situations require their own analysis. Do not reuse the ordinary table as a universal answer.

An eligible small supplier can choose to register before registration becomes mandatory. This also means collecting, reporting and sending the required tax to the authority. It is not just a way to recover tax on purchases. Before deciding, check eligibility, timing, record-keeping work and the conditions for input tax credits, which can recover qualifying tax paid on purchases.

In Quebec, ask Revenu Québec about GST and Quebec sales tax (QST), the small-supplier rules and special QST registration requirements. Deciding your GST/HST position does not settle every QST question. Low sales alone do not rule out every registration requirement.

5. Prepare a registration review file

Bring a supply-by-date schedule, quarter totals, business descriptions, associates, existing registrations and the invoice that may have crossed the threshold. Identify whether figures include sales tax and how refunds, credits, capital sales and unusual transactions were handled. Preserve original documents rather than rewriting the history to match a desired date.

• Separate ordinary threshold calculations from special mandatory rules.
• State the assumed supply classifications and unresolved questions.
• Record the proposed effective date and its supporting calculation.
• Confirm who will register, update invoicing and monitor the first reporting period.

When registration may be late, investigate promptly with a qualified adviser. Do not simply start charging today and assume earlier obligations have disappeared.

6. Coordinate the work after the decision

The tax authority and authorized adviser determine the registration steps and correct treatment. The accounting system handles the resulting tax codes and entries. Bookwits can coordinate client intake, supporting documents and assigned follow-ups; it does not register a business, decide tax liability or file a GST/HST return.

Once the decision is documented, connect it to the ongoing GST/HST return workflow. A completed registration is the beginning of a reporting obligation, not the end of the bookkeeping process.