Use the right measure
The test concerns relevant taxable supplies, not accounting profit, the owner's take-home pay or only deposits to one bank account. Zero-rated supplies can count, while the rules specify exclusions for particular amounts. Multiple business activities and associates can matter.
A rolling-quarter test is different from asking whether the January-to-December sales total was below a threshold. Keep enough detail to review the timing when sales are approaching the relevant level.
Timing changes the next step
Exceeding the threshold within one calendar quarter and exceeding it across consecutive quarters can produce different effective dates. The timing of registration and when tax must start being charged should be checked together.
For example, a new contract may increase sales rapidly during a quarter. Waiting until the annual accounts are prepared could leave the registration question unresolved after it already matters.
Some businesses need a different analysis
Taxi and commercial ride-sharing services have special registration requirements. A business supplying only exempt services also needs a different analysis from one making taxable sales. Voluntary registration has consequences of its own.
Use the CRA's current registration guidance and discuss the actual supplies, associates and dates. A calculator can organize the questions, but it cannot resolve every exception or make the registration decision for you.
Sources & editorial notes
Sources checked October 23, 2026. The examples are illustrative and provide general information. Discuss how the guidance applies to your circumstances with your accountant.
- When to register for and start charging GST/HSTCanada Revenue Agency
Rules and guidance can change. Use the current official source and confirm the treatment for your facts. To flag an error, contact Sora.