HST registration: the $30,000 threshold, explained

Every new business in Ontario meets the same question within its first year: do we have to register for HST? The answer turns on a $30,000 figure that is widely known and often misread. This is how the rule works, with each point linked to the Canada Revenue Agency page that states it, and when it makes sense to register before the rule requires it.

The small supplier rule

A business does not have to register for the GST/HST while it is a small supplier. You remain a small supplier as long as you do not exceed $30,000 of revenue from worldwide taxable supplies over four consecutive calendar quarters, and you do not exceed $30,000 in a single calendar quarter [1].

Three details in that rule do most of the work.

What counts. The threshold counts revenue from taxable supplies, including zero-rated supplies such as exports and basic groceries. It excludes financial services, sales of capital property, and goodwill from the sale of a business [1]. Exempt supplies are not taxable supplies, so a physician's insured medical services or a landlord's long-term residential rent do not count toward the $30,000.

Calendar quarters, not your fiscal year. The test looks at calendar quarters regardless of your year-end [1].

Two tests, not one. You lose small supplier status if you exceed $30,000 across four consecutive quarters, or in a single quarter [1]. The single-quarter test catches a business that lands one large contract.

When registration becomes mandatory

The timing depends on which test you failed.

If you exceeded $30,000 in a single calendar quarter, your effective date of registration is no later than the day of the supply that made you exceed $30,000, and you have to charge GST/HST on that supply [1].

If you exceeded $30,000 over four consecutive quarters, your effective date of registration is no later than the day of the first supply you make after you are no longer a small supplier [1].

In either case you have to register within 29 days of your effective date of registration [1].

Missing the date is expensive in an unglamorous way. Tax is owed on every taxable sale from the effective date whether or not you collected it from the customer. At Ontario's 13% HST rate [2], $40,000 of sales on which nothing was charged means about $5,200 out of the business's own pocket if it cannot go back to the customers.

Some businesses must register from their first sale. Taxi and ride-sharing drivers are the CRA's example: registration is mandatory even for a small supplier, effective the day passenger transportation services begin [3].

Why register early

Registration is voluntary below the threshold, and for many businesses it is the better choice.

Input tax credits. Once registered, you recover the GST/HST you pay on business purchases: equipment, software, rent, professional fees. A business investing in itself in its first year often pays more tax on purchases than it would collect on sales. Registering turns that into a refund.

Your customers are registrants. If you sell to other businesses, the HST you charge is recovered by them as an input tax credit. It costs them nothing, and an invoice without an HST number can suggest a business that has not yet organised its affairs.

Growth is coming anyway. If you expect to cross $30,000 within the year, registering at the start avoids the mid-year change in pricing, the retroactive tax on the sale that took you over, and the 29-day scramble.

The case against early registration is straightforward: if your customers are consumers who cannot recover the tax, registering makes your prices 13% higher or your margin thinner. A part-time service business selling to the public may reasonably stay a small supplier as long as it can.

Filing once registered

Registration brings a reporting period. The CRA assigns annual filing where annual taxable supplies are $1,500,000 or less, quarterly filing from $1,500,000 up to $6,000,000, and monthly filing above $6,000,000; you can elect to file more often than assigned [4]. Annual filers whose net tax for the previous fiscal year was $3,000 or more may have to pay quarterly instalments [5].

Whatever the frequency, the return should be reconciled to the ledger before it goes in. The most common HST problem we see is not the threshold. It is a return that was filed from a bank balance instead of from the books, and does not agree with them.

Sources

Checked against the linked pages on 3 September 2026. Thresholds, rates and filing rules change; confirm the current figures before acting.

1. Canada Revenue Agency, When to register for and start charging the GST/HST.
2. Canada Revenue Agency, GST/HST calculator and rates.
3. Canada Revenue Agency, Register for a GST/HST account.
4. Canada Revenue Agency, Reporting periods.
5. Canada Revenue Agency, Remit (pay) the GST/HST by instalments.

This article describes general rules and is not advice for any particular situation.