GST/HST for Small Businesses in Canada: Registration, Rates and Filing

A practical guide for Canadian and international founders

Most businesses that make taxable supplies in Canada must register for GST/HST once they no longer qualify as a small supplier. For most persons, the small-supplier threshold is CAD 30,000 of worldwide taxable supplies, including zero-rated supplies, calculated together with associated persons. The timing depends on whether the business exceeds CAD 30,000 in one calendar quarter or over four consecutive calendar quarters. Once registered, the business generally charges the correct GST/HST, files returns for every reporting period, and may claim eligible input tax credits.

What GST and HST Mean

GST is the federal Goods and Services Tax. HST combines GST with a participating province’s component. Zero-rated supplies are taxable at 0% and can preserve access to input tax credits; exempt supplies are not subject to GST/HST and generally do not support related credits.

RGB’s earlier overview, Basics of Sales Tax, explains these core categories. The current CRA pages linked below should control whenever rates, thresholds, or administrative procedures change.

Do You Need to Register for GST/HST?

A person is generally a small supplier when worldwide taxable supplies, including those of associated persons, do not exceed CAD 30,000 in one calendar quarter or over four consecutive calendar quarters. Certain revenues are excluded, including financial services, sales of capital property, and goodwill. Public service bodies generally use a CAD 50,000 threshold.

If You Exceed CAD 30,000 in One Calendar Quarter

You stop being a small supplier on the supply that causes your revenue to exceed CAD 30,000. You generally charge GST/HST on that transaction and register within 29 days of the effective date. This scenario is most likely to surprise a fast-growing business because the obligation can arise mid-sale rather than after year-end.

If You Exceed CAD 30,000 Over Four Consecutive Quarters

If you remain under CAD 30,000 in every single quarter but exceed the threshold across four consecutive calendar quarters, you generally remain a small supplier through those quarters and the following month. Registration becomes effective no later than the first taxable supply after you stop being a small supplier, and you generally have 29 days from that effective date to register.

Businesses That May Have Different Rules

Taxi and commercial ride-sharing operators must generally register even below the threshold. Non-resident businesses and digital-economy businesses can face special registration systems and tests. A foreign address does not, by itself, answer whether registration is required. Review the nature of the supply, Canadian customers, delivery, platforms, contracts, inventory, employees, and whether the business carries on business in Canada.

Should a Small Supplier Register Voluntarily?

A business below the threshold may register voluntarily when it makes taxable supplies in Canada. This may help when customers are registrants, start-up costs are high, or rapid growth is expected, but it creates ongoing obligations.

Before choosing an effective date, model whether customers can recover the tax, which expenses generate credits, and who will maintain the records.

Which GST/HST Rate Should You Charge?

The rate generally depends on the place of supply, not only the seller’s office. For goods, delivery location is often critical. Services, real property, and intangible property have their own rules. As of October 2026, the CRA lists the following federal GST or HST rates for ordinary taxable supplies:

Zero-rated supplies remain taxable at 0%. Exempt supplies are treated differently. Before automating rates, classify the supply and confirm where it is considered made under CRA’s place-of-supply rules.

How Input Tax Credits Work

A GST/HST registrant may recover tax paid or payable on eligible purchases and expenses used in commercial activities by claiming input tax credits, or ITCs. In Spanish, the concept may be described as a crédito fiscal, but Canadian eligibility depends on the Excise Tax Act, the commercial use of the expense, and supporting documents.

Example. An Ontario design studio invoices CAD 10,000 plus CAD 1,300 HST and has CAD 2,000 of eligible operating purchases plus CAD 260 HST. Ignoring other adjustments, the studio reports CAD 1,300 collected and claims a CAD 260 ITC, leaving CAD 1,040 of net tax. The HST collected is not revenue, and the HST paid is not automatically an expense when it is recoverable.

Invoices and receipts must contain prescribed information, with more detail required as transaction value increases. Verify supplier identity, date, amount, tax, and registration number where required before claiming an ITC.

GST/HST Filing and Payment Deadlines

Every registrant must file a return for each reporting period, even with no activity or no net tax. CRA assigns a reporting period based on revenue, although eligible businesses may elect a different frequency.

Deadlines can differ for listed financial institutions and other special cases. Confirm the assigned period and due dates in the CRA account. If a deadline falls on a Saturday, Sunday, or CRA-recognized holiday, CRA generally accepts the next business day.

Common GST/HST Mistakes Small Businesses Make

• Monitoring calendar-year sales instead of the current quarter and the previous four consecutive calendar quarters.
• Using Canadian revenue only when the small-supplier test may require worldwide taxable supplies and associated-person revenue.
• Adding 13% HST to every Canadian invoice without applying place-of-supply rules.
• Charging GST/HST before registering or failing to charge from the correct effective date.
• Treating collected GST/HST as business income available for spending.
• Ignoring QST or provincial sales taxes when the business operates outside HST provinces.
• Failing to reconcile the GST/HST control account to returns, payments, sales, purchases, and CRA statements.

A GST/HST Setup Checklist for Small Businesses

• Classify each product or service as taxable, zero-rated, or exempt.
• Track worldwide taxable supplies monthly and maintain a rolling four-quarter threshold report.
• Identify associated persons whose taxable supplies may be included in the threshold test.
• Confirm the registration effective date and invoice from that date.
• Map place-of-supply rules and tax rates to customer and delivery data.
• Configure invoices to show required supplier, registration, transaction, and tax details.
• Create separate general-ledger accounts for tax collected, recoverable ITCs, payments, and adjustments, and retain supporting documents.
• Record filing frequency and separate filing and payment deadlines.
• Reconcile every return to the general ledger and CRA account before and after filing.
• Review foreign sales, online platforms, warehouses, contractors, and new locations before expansion.
• Coordinate accounting, legal, and tax specialists when cross-border structures change the facts.

Build GST/HST Compliance Into Growth

GST/HST should be designed into pricing, contracts, invoicing, bookkeeping, and cash-flow forecasts. That is especially important for multicultural founders and partnerships whose sales teams, finance teams, customers, and advisors operate in different countries. Clear systems make registering for GST/HST a controlled business process rather than an emergency after the threshold has already been crossed.

RGB Accounting provides tax services, bookkeeping, and multicultural advisory support for Canadian small businesses and international entrepreneurs. Our team can help assess registration timing, set up accounts, review rates, reconcile returns, and coordinate cross-border questions with the right specialists.

Source: CRA