GST/HST Registration Calculator
Find out whether you must register for GST/HST in 2026. Registration becomes mandatory once your worldwide taxable revenue passes $30,000 in a single calendar quarter or over four consecutive quarters — below that you are a small supplier and registration is optional. Enter your revenue over the trailing four quarters to see your status and, if required, how many days you have left to register.
Estimate only for the 2026 tax year. Not tax, accounting or financial advice. Talk to RN Canada about your situation.
How it works
The calculator checks your entered revenue against the $30,000 small-supplier threshold for a single quarter and for four consecutive quarters, matching the CRA's rolling test, and flags mandatory registration the moment either test is crossed.
What the result includes
Results show whether registration is mandatory or optional, which threshold test triggered it, and a reminder of the 29-day registration window from the sale that crossed the threshold.
Assumptions
Assumes standard small-supplier rules; taxi/ride-share drivers and non-resident digital suppliers face different mandatory-registration rules not modelled here.
Frequently asked questions
Once your worldwide taxable revenue exceeds $30,000 in a single calendar quarter, or cumulatively over four consecutive quarters, registration becomes mandatory and you have 29 days from the triggering sale to register.
You are a small supplier and registration is optional. Many small suppliers still register voluntarily to recover GST/HST paid on business purchases through input tax credits.
No. The test is rolling: it looks at any single calendar quarter and at the trailing four consecutive quarters, not your business's fiscal year.
Yes, voluntary registration is allowed below the threshold, and the effective date can generally be backdated up to 30 days to help recover tax on recent startup costs.
Last reviewed: 2026-08-19. Sources: Canada Revenue Agency — When to register for GST/HST