Registering for GST/HST: When, How, and What Happens Next
"Register when you hit $30,000" is the most repeated — and most oversimplified — line in Canadian small-business tax. The threshold is real, but almost everything freelancers assume about it is slightly wrong: it counts revenue, not profit; it's measured over rolling calendar quarters, not your tax year; there are two different trigger paths with two different effective dates; and one of those paths makes the very sale that pushed you over the line taxable on the spot. The registration itself takes fifteen minutes online. Knowing exactly when you're required to do it — and whether you should do it early by choice — is the part that takes some care. This guide walks through the small-supplier test properly, the registration mechanics, and the obligations that switch on the day your number is issued.
The Small-Supplier Test, Done Right
You are a "small supplier" — and therefore not required to register — while your worldwide taxable revenues stay at or under $30,000. Four details in that sentence do the heavy lifting:
- Revenues, not profit. The test is what you billed for taxable supplies, before expenses and before any GST/HST. A freelancer who invoices $35,000 and keeps $20,000 after costs has crossed.
- Taxable includes zero-rated. Zero-rated supplies — many exports of services to non-resident clients, for example — are taxable supplies taxed at 0%, so they count toward the $30,000 even though you charge no tax on them. Exempt supplies (certain health, education, and financial services) do not count.
- Calendar quarters, not your fiscal year. The clock runs on calendar quarters (January–March, April–June, and so on), measured on a rolling basis.
- Associated businesses count together. The revenues of associated entities are combined, so the threshold can't be multiplied by splitting one operation into two.
Trigger Path 1: Over $30,000 Across Four Rolling Quarters
If your combined taxable revenues over the last four consecutive calendar quarters exceed $30,000 — without any single quarter doing it alone — you generally keep small-supplier status for one more month after the end of that fourth quarter. Your obligation to charge GST/HST begins with the first taxable sale after that grace month, and you must register within about 29 days of it.
Worked example: A designer bills $8,000, $7,500, $9,000, and $8,000 across the four quarters ending June 30 — $32,500 cumulative. They remain a small supplier through July (the grace month). Their first invoice issued August 1 or later must include GST/HST, and registration is due within roughly 29 days of that sale.
Trigger Path 2: Over $30,000 in a Single Quarter
If one calendar quarter alone takes you past $30,000, there is no grace month. You cease to be a small supplier immediately: the sale that crossed the threshold is itself taxable, you are treated as a registrant from that day, and you have about 29 days to formally register.
Worked example: A consultant with modest history lands a $34,000 contract invoiced in a single February. That invoice must include GST/HST — even though the consultant had no number yet when the month began — and registration is due within roughly 29 days.
The single-quarter path is the one that catches freelancers by surprise, because one large project can flip your status mid-invoice. If a five-figure contract is on the table, check your position before you bill it. Effective-date rules have nuances — verify the current treatment on canada.ca.
Who Must Register Regardless of the Threshold
The $30,000 test has carve-outs. The one that matters most to gig workers: commercial ride-sharing. Uber and Lyft drivers must register for GST/HST from their first dollar of fares — the small-supplier threshold does not apply to ride-sharing services, though it still applies to food delivery. The full rules for drivers are in our rideshare driver tax guide. Taxi operators fall under the same rule.
At the other end, a business that makes only exempt supplies generally cannot register at all — no registration, no charging, and no input tax credits, regardless of revenue.
Registering Voluntarily: Worth It Before $30,000?
Any business making taxable supplies can register before it must. The trade-offs are straightforward:
| For voluntary registration | Against |
|---|---|
| Input tax credits — recover the GST/HST paid on startup costs, equipment, and software from day one | Administration — file every period, even nil returns, on deadlines that don't care how small you are |
| Credibility — business clients often read an HST number as "established"; the tax costs them nothing since they claim it back as their own ITC | Consumer-facing prices rise — clients who can't claim ITCs (individuals) genuinely pay more the day you register |
| No awkward mid-year switch when growth arrives — your pricing and invoicing are already correct | Commitment — voluntary registrants generally must stay registered for at least a year |
The pattern: freelancers billing mostly businesses usually benefit from registering early; those billing mostly consumers usually benefit from waiting.
The Mechanics: Getting the Number
Registering means opening a GST/HST program account — the account ending RT0001 — attached to a CRA Business Number. If you don't have a Business Number yet, both are created together in one pass. Three routes:
- Business Registration Online (canada.ca) — the fastest path; the account number is typically issued immediately at the end of the session
- Phone — the CRA's business enquiries line
- Mail or fax — Form RC1, the slow path
Have answers ready for what the process asks:
- Business structure — sole proprietorship for most freelancers (registration ties to your name and SIN), partnership, or corporation
- Fiscal year end — most sole proprietors use December 31
- Estimated annual taxable revenues — this sets your default filing frequency; smaller businesses default to annual filing with the option to elect quarterly or monthly
- Effective date of registration — the date your obligation began (see the trigger paths above), not simply "today"
What Changes the Day You're Registered
The number arrives with obligations attached. From the effective date:
- Charge the right rate on every taxable sale — determined by your client's place of supply, not your own province. Our place of supply guide covers which rate applies when you bill across provincial lines.
- Show your registration number on invoices — clients need it to claim their own ITCs, and the CRA expects it on invoices above small-amount thresholds. See how to include your Business Number on invoices.
- File every period — even nil. A quarter with zero sales still requires a return, and missed nil returns attract the same late-filing treatment as missed real ones. Filing frequencies, due dates, and the GST34 mechanics are in our remittance guide.
- Track ITCs from day one. Every business receipt with GST/HST on it reduces what you remit — but only if you capture it.
- Decide on the Quick Method early. Low-expense service freelancers often come out ahead remitting a flat rate instead of tracking ITCs — but the election has timing rules, so run the comparison in your first year. See our Quick Method guide.
Missed the Threshold? Cleaning It Up
If you crossed $30,000 months (or years) ago and never registered, the CRA can backdate your registration to the date your obligation began — which means you owe the GST/HST you should have collected on every taxable sale since, whether or not you can go back to clients and re-bill it. Interest applies, and many freelancers end up paying the uncollected tax out of pocket. The CRA's voluntary disclosure program can reduce the damage when you come forward before they come asking. This is squarely consult-an-accountant territory — the cleanup is routine for professionals and stressful for everyone else.
Where InvoiceFast Fits
Registration changes your invoicing overnight — every invoice now needs the right tax, at the right rate, shown the right way. InvoiceFast calculates GST/HST automatically by province on every invoice and puts your registration number where the CRA expects it, so the day-one switch is a settings change rather than a template rebuild. On the other side of the ledger, the built-in expense tracker captures the GST and HST on every receipt you snap, so your ITC total builds itself alongside a T2125 summary your accountant can work from. InvoiceFast reports these totals; it does not file GST/HST returns. Your first 25 expenses and 25 trips are free; Pro + Tax ($12.99/month or $99.99/year CAD) unlocks unlimited tracking and the summary exports.
Frequently Asked Questions
Do I count expenses or revenue toward $30,000?
Revenue — total billings for taxable supplies before expenses, and before GST/HST. Profit is irrelevant to the test.
Do zero-rated sales count toward the threshold?
Yes. Zero-rated supplies are taxable supplies taxed at 0%, so exports of services to non-resident clients still count toward the $30,000 even though no tax is charged on them. Exempt supplies do not count.
What if I go over $30,000 in a single quarter?
No grace month: the sale that crossed the line is taxable, you're a registrant from that day, and formal registration is due within about 29 days.
Can I register before hitting the threshold?
Yes — voluntary registration unlocks ITCs on startup costs and looks established to business clients, at the price of charging tax and filing every period. It generally suits business-facing freelancers more than consumer-facing ones.
Can I deregister later?
Generally yes, if your revenues fall back under the threshold and you've been registered at least a year — but closing the account has consequences, including potential repayment of ITCs on assets you still hold. See our guide on closing a GST/HST account.