GST/HST Registration Threshold in Canada: The $30,000 Small Supplier Rule Explained (2026)

One of the most common questions I hear from new business owners is: “Do I need to charge HST?” The answer depends on the GST/HST registration threshold in Canada: $30,000 of taxable revenue. Get it wrong and the CRA can register you back to the date you crossed the line, leaving you owing HST on sales where you never charged it.

What Is a Small Supplier for GST/HST?

You’re a small supplier, and don’t have to register for GST/HST, as long as your taxable revenue stays at or under $30,000. Once you go over, registration becomes mandatory. A few details catch people out:

• It’s revenue, not profit. The test uses total taxable sales before expenses.
• It’s worldwide. Sales to customers outside Canada count, including zero-rated sales.
• Associated businesses are combined. If you control more than one business, their taxable sales may be added together.
• Employment income doesn’t count. Only business revenue does.

Two Ways to Cross the $30,000 GST/HST Threshold

The CRA tests the threshold two ways, and the timing differs:

1. In a single calendar quarter. If your taxable sales go over $30,000 within one quarter, you stop being a small supplier immediately, with the sale that took you over. You must charge GST/HST on that sale and every sale after it.

2. Over four consecutive calendar quarters. If you exceed $30,000 across the last four quarters combined, but not in any single one, you remain a small supplier until the end of the month after the quarter in which you crossed the threshold.

Either way, you must register within 29 days of the day you stop being a small supplier. (CRA: when to register for and start charging GST/HST)

What Happens If You Don’t Register for GST/HST?

If you cross the threshold and keep operating without registering, the CRA can register you retroactively. You’d owe the GST/HST you should have collected, often out of your own pocket because you can’t go back and bill old customers, plus penalties and interest.

In Ontario, HST is 13%. On $50,000 of unbilled sales, that’s $6,500 that has to come from somewhere.

Should You Register for GST/HST Voluntarily Under $30,000?

Sometimes, yes. Voluntary GST/HST registration has real advantages:

• Input tax credits (ITCs): recover the GST/HST you pay on business expenses like equipment, software, rent and professional fees.
• Credibility: some businesses and government buyers prefer, or require, suppliers with a GST/HST number.
• No surprises: you won’t scramble to register when growth arrives faster than expected.

The trade-off: once registered, you must charge GST/HST on taxable sales and file regular returns, and if you register voluntarily you should plan to stay registered for at least a year. If your customers are mostly consumers, adding 13% may make you pricier than an unregistered competitor. If they’re mostly businesses, they can usually claim the tax back.

Exceptions to the Small Supplier Rule

Some businesses must register from their very first sale, whatever their revenue. The most common example is taxi and ride-sharing drivers. Non-resident businesses selling digital services to Canadians can also face special rules. If you’re in either group, don’t rely on the $30,000 threshold.

GST/HST Registration Checklist

• Track taxable sales by calendar quarter.
• Watch both tests: any single quarter and the last four quarters combined.
• Register within 29 days of crossing the threshold.
• Consider registering early if you buy a lot of taxable supplies or sell mainly to businesses.

Registered businesses also have income tax obligations. See the CRA tax deadlines for self-employed Canadians, and if you’re growing fast, whether it’s time to incorporate in Ontario.

Frequently Asked Questions

What is the GST/HST registration threshold in Canada?

The small supplier threshold is $30,000 of worldwide taxable revenue, tested in any single calendar quarter and over the last four consecutive calendar quarters. Above it, GST/HST registration is mandatory.

How long do I have to register for GST/HST after crossing $30,000?

You must register within 29 days of the day you stop being a small supplier.

Can I register for GST/HST if I earn less than $30,000?

Yes. Voluntary registration lets you claim input tax credits on business expenses, but you must then charge GST/HST on taxable sales and file returns.

What is the HST rate in Ontario?

The HST rate in Ontario is 13%.

This article is general information, not tax advice. Rules and amounts change, so confirm details with the Canada Revenue Agency or a qualified professional.

Not sure where your business stands? Wealth Street Services can review your numbers and handle your GST/HST registration and filings. Contact Gur Sian.

About the author: Gur Sian, MBA, CPA, is a Brampton, Ontario entrepreneur and the CEO of Wealth Street Services Inc. (accounting, tax, financial planning and investment management) and The Elev8 Media Inc. (digital marketing and video production). He also operates Sian Real Estate Inc.