The GST/HST small supplier threshold is not an annual number

 Most people hear thirty thousand dollars and picture a calendar year. That is not the test, and the difference decides whether you end up owing tax you never collected.

The small supplier rule runs two tests, and failing either one ends the exemption.

The first is rolling. Add up your worldwide taxable supplies over the last four consecutive calendar quarters. If that total passes $30,000, you stop being a small supplier at the end of the month following that quarter, and you need to be registered by then. Any four consecutive quarters, not January through December.

The second is immediate. If one calendar quarter on its own puts you over $30,000, the exemption ends at the sale that crossed the line. You are required to charge tax on that sale, not on the next one.

The expensive version goes like this. A consultant bills steadily all year, a large project lands in the fall, the line gets crossed in October, nobody notices until the return is prepared in April, and now there is tax owing on six months of invoices that went out without it. The client is not obliged to pay it late. It comes out of the margin.

Two things catch people. Zero-rated sales still count toward the threshold while exempt supplies do not, and those two categories are easy to confuse. And if you drive a taxi or a ride-share, the threshold does not apply to you at all: registration is required from the first fare.

There is an upside worth knowing. Registering voluntarily while you are still under the threshold lets you claim input tax credits on what you buy. For a business with real equipment or software costs and mostly commercial clients, registering early is often the better arithmetic.

Khaled Hawari runs an independent tax and bookkeeping practice in Ottawa. The practice is at khaledhawari.ca and the fractional finance work is at kna-group.com.

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