GST/HST Registration in Canada: Do You Really Need to Register?

Most new business owners assume they only need to worry about GST/HST once they're making good money. That assumption costs them. The CRA's $30,000 threshold has nothing to do with profit — it's gross revenue, and once you cross it, you must register within 29 days or face retroactive penalties.

This guide explains exactly how the GST/HST registration threshold works, who is exempt, who must register, and what happens if you wait too long.

What Is the $30,000 Threshold?

The GST/HST small supplier threshold is $30,000 in taxable revenues in a single calendar quarter or over the previous four calendar quarters. Below this amount, you're considered a "small supplier" and registration is voluntary. Once you exceed it, you become legally required to register.

The $30,000 applies to your total taxable revenues — not profit, not invoices paid, not your business bank account balance. It's gross revenue from taxable supplies before any expenses.

The Two Ways You Can Cross the Threshold

• In a single quarter: If your taxable revenues in any one calendar quarter (Jan–Mar, Apr–Jun, Jul–Sep, Oct–Dec) exceed $30,000 on their own, you must register immediately. You are required to start charging GST/HST the day you exceed the threshold.
• Over four rolling quarters: Add up your taxable revenues for the past four consecutive calendar quarters. If the total exceeds $30,000, you must register by the end of the following month.

Who Is Exempt from Registration?

Not all businesses need to register, even above $30,000. The following are generally exempt:

• Suppliers of exempt supplies — certain financial services, most healthcare services, residential rent, and educational services are GST/HST exempt. If you only make exempt supplies, you never register — regardless of revenue.
• Small suppliers under the threshold — as long as you stay under $30,000 in taxable revenues over the past four quarters and in the current quarter.

Note: zero-rated supplies (like basic groceries or most exports) are different from exempt supplies. Zero-rated means GST/HST is charged at 0% — you still register, but you charge nothing and can claim input tax credits on your purchases.

Voluntary Registration: Should You Register Before $30,000?

Yes — in most cases, registering voluntarily before you hit $30,000 makes sense. Here's why:

• You can claim Input Tax Credits (ITCs) on purchases from day one. If you're buying equipment, software, or professional services for your business, you're paying GST/HST on those costs. Once registered, you can recover that tax.
• It signals professionalism to larger clients and other businesses. Being GST/HST registered means you have a Business Number — a sign of a legitimate operation.
• You avoid a scramble when you suddenly cross the threshold mid-quarter and have to retroactively track which invoices should have had GST/HST added.

The downside: once registered, you must file returns on schedule (monthly, quarterly, or annually), collect GST/HST from clients, and remit it to the CRA. This adds administrative work. For very small side businesses with no significant business purchases, waiting until $30,000 is reasonable.

How to Register for a GST/HST Account

Registration is done through the CRA. You'll receive a Business Number (BN) with a GST/HST program account (ending in RT0001). The registration process takes 10 minutes online:

1. Go to the CRA's Business Registration Online (BRO) at canada.ca/business-registration
2. Select "Register for a GST/HST account"
3. Provide your SIN or existing BN, business type, fiscal year-end, and expected annual revenues
4. Choose your filing frequency (more on this below)
5. The CRA will issue your BN and RT account number, usually within minutes for online registration

If you'd rather not navigate the registration process yourself, our GST/HST filing service handles registration and manages your returns throughout the year.

What Filing Frequency Will You Be Assigned?

The CRA assigns a filing period based on your expected annual taxable revenues:

• Annual: under $1.5 million — file once per year
• Quarterly: $1.5 million to $6 million — file four times per year
• Monthly: over $6 million — file every month

Most new registrants are assigned annual filing. You can voluntarily elect monthly or quarterly filing if you prefer more frequent cash flow management — some businesses prefer quarterly to avoid a large year-end payment.

What Happens If You Don't Register on Time?

If you were required to register and didn't, the CRA can assess you for all the GST/HST you should have been collecting — going back to the date you should have registered. You'll owe that amount out of your own pocket, even if you never charged your clients. On top of that, you'll face:

• A late registration penalty
• Interest on all amounts owing from the date they were due
• Potential gross negligence penalties if the CRA determines it was willful avoidance

The most painful part: you can't go back and re-invoice your clients for the GST/HST you should have charged. You absorb it.

GST/HST Rates by Province (2026)

The rate you charge depends on the province or territory where your customer is located (the "place of supply" rules):

• 5% GST: Alberta, British Columbia, Manitoba, Saskatchewan, Quebec (QST is separate), Northwest Territories, Nunavut, Yukon
• 13% HST: Ontario
• 15% HST: New Brunswick, Newfoundland & Labrador, Nova Scotia, Prince Edward Island

If you sell to customers across multiple provinces, you apply the rate for where the customer is — not where you are. This gets complex quickly for service businesses, especially online sellers.