GST/HST Registration in Canada: When the Small Supplier Threshold Kicks In
You freelance your first Canadian contract in March. A second follows in June. By September you’ve quietly crossed a line you didn’t know existed. Now you owe GST or HST on revenue you already spent.
If you’re self-employed or running a small business in Canada, the Canada Revenue Agency treats you as a “small supplier” up to a certain revenue threshold. Small suppliers aren’t required to register for or charge GST/HST. Cross it, and registration stops being optional — which raises the obvious question of when do I have to register for GST/HST in Canada in the first place.
How the measurement actually works
The threshold is measured on your worldwide taxable revenue rather than Canadian sales alone, and it’s checked two ways: over the last four consecutive calendar quarters combined, and in any single quarter on its own. Cross either measure and you stop qualifying as a small supplier from that point onward, rather than retroactively from January.
The dollar figure itself
Readers often ask what is the thirty thousand dollar small supplier limit exactly, expecting a round, fixed number. Confirm the exact current dollar figure on the CRA’s own site before you rely on it. Thresholds are exactly the kind of detail this blog will not guess at, and checking takes two minutes.
The rolling window that catches people
This runs on a rolling basis instead of a calendar-year basis — that’s how the small supplier test measured over four quarters actually works. A strong single quarter, on top of steady prior quarters, can tip you over mid-year in a way a simple annual mental tally would miss. Track cumulative revenue from your first invoice rather than reconstructing it later.
What actually counts as revenue
Generally, yes — revenue from most goods and services you supply counts, including sales to clients outside Canada in many cases. Certain supplies are excluded from the calculation, GST/HST-exempt supplies among them — worth checking against CRA’s guidance or a Canadian accountant’s advice rather than assuming.
What happens once you cross it
You become required to register, generally from the point you exceed the threshold. From registration onward you must charge GST/HST on your taxable supplies and file returns. Registering also means you can claim input tax credits on GST/HST you pay on business expenses, which for some businesses is a real benefit rather than a pure cost.
The practical move
If you’re close to the threshold or expect to cross it within the next few months, registering voluntarily before you’re required to can be the simpler path. It avoids the scramble of registering after the fact and working out what should have been charged on invoices already sent.
None of this replaces sitting down with a Canadian accountant early, particularly if you’re straddling South African and Canadian tax obligations in your first year — that overlap is where general advice like this stops being enough.
Our free guide to what Canada really costs covers the budgeting side of self-employment in your first year, alongside the bigger settlement numbers.