When Do You Need to Register for HST in Ontario? The $30,000 Rule for 2026

In Ontario you must register for HST once your taxable sales go over $30,000, either in a single calendar quarter or across the last four calendar quarters added together. Below that you are a “small supplier” and registration is optional. Once you cross the line, you have 29 days from your effective date to register, and you charge 13% HST from that date whether or not your account number has arrived.

What is the $30,000 small supplier rule?

The CRA calls a business with $30,000 or less in taxable sales a small supplier. A small supplier doesn’t have to register, charge or file. The test runs on calendar quarters (January to March, April to June, July to September, October to December), not on your fiscal year. You stop being a small supplier the moment either of two tests is failed.

The single-quarter test catches fast growth, such as one big contract. The four-quarter test catches steady growth, and it is the one most owners miss, because no single quarter looks large.

How does it work with real dates?

One big quarter. A Guelph contractor has billed $22,000 since October 1, 2026. On November 25 they invoice a $10,000 job. That invoice takes the quarter to $32,000, so they stop being a small supplier with that sale. The $10,000 invoice needs 13% HST on it, their effective date is no later than November 25, and they have 29 days from then to register.

Steady growth. A consultant bills $6,000 from October to December 2025, then $7,000, $8,000 and $10,000 in the next three quarters. No quarter comes close to $30,000, but the four quarters ending September 30, 2026 total $31,000. They remain a small supplier until the end of the following month, October 31, 2026. Their effective date is no later than their first sale after that, say November 3, and that sale is the first one that carries HST.

Run the four-quarter test at the end of every quarter. You can only do that if your sales are recorded month by month, which is one quiet reason up-to-date books matter long before you owe any tax.

What counts toward the $30,000?

The CRA counts revenue before expenses, not profit. Count:

• Your taxable sales worldwide, including sales to customers outside Canada.
• Zero-rated sales, even though they carry 0% tax.
• The taxable sales of any business associated with yours, such as a second company you control.

Leave out:

• Exempt financial services.
• Sales of your capital property, such as an old work truck or equipment.
• Goodwill from selling a business.

The associated-business rule catches owners who split work across two companies to stay under the line. Whether two businesses are associated is a technical question. If you own more than one, ask a tax professional before you rely on staying small.

Who has to register even under $30,000?

Self-employed taxi and commercial ride-sharing drivers must register from the day they start giving rides, at any income level. Charities and other public service bodies use a $50,000 test instead of $30,000, with extra rules. Some non-residents selling admissions to events in Canada must also register. Everyone else can wait for the threshold.

Should you register for HST before you have to?

Any small supplier making taxable sales can register voluntarily. The effective date is usually the day you apply, and the CRA can accept a date up to 30 days earlier. Whether it pays depends mostly on who your customers are.

A start-up buying equipment and selling to other businesses often comes out ahead by registering early. A house painter selling to homeowners, well under the line, usually doesn’t.

What happens if you passed $30,000 and didn’t register?

The obligation started without you. The CRA’s registrant guide says you must charge tax on the sale that takes you over “even if you are not yet registered”. If your invoices since then went out without HST, the tax on them is still owed, and unless you can go back to customers for it, it comes out of your margin.

Fix it in this order. Work out the date you actually crossed the line, using the two tests above. Register with that date as your effective date. Start charging HST on every invoice now. Then file the returns for the periods you missed. Our catch-up bookkeeping guide covers filing late HST returns, the late-filing penalty, and the CRA programs that can reduce penalties and interest. Talk to a tax professional before you file, because the right effective date matters.

How do you register for an HST account?

The CRA calls Business Registration Online the fastest and easiest way to register, and you need a CRA account to use it. If you don’t have a business number yet, you get one at the same time. Have these ready:

• Your name, Social Insurance Number, date of birth and home postal code.
• The business name, type of business, owners, and physical and mailing addresses.
• A short description of what the business does.
• The effective date of registration you worked out above.
• Your fiscal year end and your annual revenue, or a reasonable estimate if you are new.

The CRA does not mail you the business number. Save or print it, and your HST account number, before you close the session.

What changes once you are registered?

• You charge 13%. Ontario’s HST rate is 13% on taxable sales to Ontario customers, and every invoice shows it.
• You file on a schedule. With $1.5 million or less in annual taxable sales, the CRA assigns an annual reporting period, and most annual returns are due three months after your fiscal year end. You can choose to file quarterly. Our guide to quarterly vs annual HST filing helps you pick, and the HST filing deadlines guide lists the 2026 dates.
• You claim credits back. As a new registrant you may be able to claim input tax credits for HST on inventory and capital property you already own on the day you register. You can also claim HST paid before registering on services supplied to you afterward, like the part of prepaid rent that covers months after your effective date. You can’t claim it on services you used before you registered.

HST registration and returns in Guelph and across Ontario

Intersect works with small businesses from our office on Carden Street in downtown Guelph, and remotely across Ontario. Monthly bookkeeping gives you the quarter-by-quarter sales totals the $30,000 test needs, so you see the line coming instead of finding out at tax time. Once you are registered, we prepare and file your HST returns every period and track any instalments. A real person answers the phone, and we explain what we find in plain language. See what our tax preparation and filing covers, or tell us where your sales are.

Frequently asked questions

Do I need to register for HST if I make less than $30,000?

Not usually. If your taxable sales stay at $30,000 or less in every calendar quarter and over every four consecutive quarters, you are a small supplier and registration is optional. Taxi and commercial ride-sharing drivers are the main exception: they must register from their first fare.

Is the $30,000 based on revenue or profit?

Revenue. The CRA counts your taxable sales before expenses, including zero-rated sales and sales made outside Canada, plus the sales of any associated businesses. Financial services, sales of capital property and goodwill from selling a business are left out.

How long do I have to register once I pass $30,000?

The CRA gives you 29 days from your effective date of registration. Your effective date depends on how you crossed the line. In a single quarter it is no later than the sale that took you over. Over four quarters it is no later than your first sale after the end of the month following that quarter.

Can I cancel a voluntary HST registration if it does not work out?

Only after a year. The CRA says you have to stay registered for at least one year before you can ask to cancel. Until then you charge HST and file every return, including nil returns for quiet periods.