GST/HST Registration for Self-Employed Canadians: When to Register and Why You Might Want to Early

GST/HST registration is mandatory once your revenue exceeds $30,000 over any four consecutive calendar quarters. But you can register voluntarily before hitting that threshold, and in many cases you should. Voluntary registration lets you claim input tax credits (ITCs) on your business expenses from day one, which means the CRA refunds the HST you pay on equipment, software, office supplies, and other costs.

At Tohme Accounting, we set up GST/HST accounts for self-employed clients across Ottawa and Toronto every week. The most common mistake we see is waiting until after the $30,000 threshold, then scrambling to register and retroactively sort out months of uncollected tax. The second most common mistake is not registering voluntarily when the ITC math clearly favours it.

This guide covers the $30,000 threshold mechanics, when voluntary registration makes financial sense (with a dollar example), the quick method of accounting, what happens if you register late, and how incorporation resets the threshold.

The $30,000 Threshold: How It Actually Works

You must register for GST/HST when your total taxable revenue exceeds $30,000 in a single calendar quarter, or over four consecutive calendar quarters. The CRA uses a rolling test, not a calendar-year test. Revenue from January through December does not reset on January 1.

Under the Excise Tax Act (ETA) subsection 148(1), a person is a “small supplier” and exempt from registration as long as total taxable supplies stay at or below $30,000 in the current quarter and in the four preceding quarters combined. The moment you cross $30,000 in a single quarter, you are no longer a small supplier as of that day. If you cross it over four quarters, you lose small supplier status at the start of the quarter in which you exceed the threshold.

Here is where people get tripped up: the $30,000 includes all taxable revenue, not just what you collect in one month. If you invoice $8,000 in each of four quarters, that is $32,000 and you are over the line.

Once you exceed the threshold, you must register within 29 days. You are required to start charging GST/HST on every taxable supply from the date you lost small supplier status, not from the date you register.

The $30,000 threshold resets when you incorporate. A new corporation is a separate legal entity with its own small supplier status. If your sole proprietorship has been collecting HST and you incorporate, the corporation starts fresh at zero. Your personal GST/HST account and the corporation’s are completely separate. We cover the broader sole proprietorship vs incorporation decision in a separate post.

Why Voluntary Registration Can Save You Money

You can register for GST/HST at any time, even if your revenue is $5,000 a year. Once registered, you charge HST on your sales and remit it to the CRA. But you also claim ITCs on the HST you pay on business expenses. If your expenses are high relative to your revenue (which is common in the first year or two of a business), the ITCs can exceed the HST you collect. The CRA sends you the difference as a refund.

Here is a real example. A freelance graphic designer in Ottawa earns $24,000 in their first year. They are under the $30,000 threshold and not required to register. But they spent $8,500 on a new computer, software subscriptions, office furniture, and internet. In Ontario, the HST rate is 13%.

Without registration: they pay $1,105 in HST on their $8,500 in expenses. That HST is a cost they absorb. No ITCs, no refund.

With voluntary registration: they charge 13% HST on their $24,000 in revenue, collecting $3,120 from clients. They claim $1,105 in ITCs on their expenses. They remit $3,120 – $1,105 = $2,015 to the CRA. But wait: they passed the $3,120 through to clients, so the net effect on their cash flow is positive by $1,105. That is the HST they would have absorbed as a cost.

The math gets even better when startup costs are high. A consultant who buys $15,000 in equipment and earns $10,000 in their first quarter would collect $1,300 in HST but claim $1,950 in ITCs. The CRA refunds the $650 difference. The business actually receives money back.

If most of your clients are other businesses (B2B), the HST you charge them is just a flow-through. They claim their own ITCs on it. Your prices do not effectively increase for them. If your clients are consumers (B2C), adding 13% to your invoices can affect price sensitivity, and that is a factor worth considering before registering early.

At our firm, we run this calculation for every new self-employed client during their initial tax planning session. If the ITC benefit outweighs the administrative cost of filing HST returns, we recommend registering right away. Contact our team if you want us to run the numbers for your situation.

How to Register for a GST/HST Number

Registration takes about 10 minutes online and the account is usually active within a few business days.

1. Go to the CRA’s Business Registration Online service (accessible through your CRA My Business Account or through the BRO portal).
2. If you do not have a business number (BN), you will get one as part of the registration. The BN is a 9-digit number that identifies your business with the CRA.
3. Select “GST/HST” as the program account you want to add.
4. Enter your effective date of registration. If you are registering voluntarily, you choose the date. If you are required to register because you crossed the threshold, the effective date is the date you lost small supplier status.
5. Select your reporting period: annual, quarterly, or monthly. Annual is the default for businesses under $1.5 million in revenue. Quarterly works if you want more frequent ITC refunds.
6. Choose your filing method: regular or quick method (more on this below).

You can also register by phone (1-800-959-5525) or by mailing Form RC1 to your tax services office.

Once registered, your GST/HST number is your BN followed by “RT0001.” You put this number on every invoice where you charge HST.

The Quick Method of Accounting

The quick method is an alternative to tracking ITCs on every individual expense. Instead of calculating the HST you paid on each business purchase, you simply remit a flat percentage of your HST-included revenue to the CRA and keep the rest.

For most service-based businesses in Ontario, the quick method remittance rate is 8.8% of HST-included revenue. Since you collected 13% HST, the difference (roughly 4.2% of your revenue before HST) is yours to keep. On $50,000 in revenue, that is about $2,100 in savings compared to remitting the full 13% and claiming no ITCs.

The quick method works best when your business expenses are low relative to revenue. Service businesses with minimal equipment costs (consultants, freelancers, coaches) often save money with the quick method. Businesses with high material costs (contractors, manufacturers) are usually better off with the regular method because their ITCs exceed the quick method savings.

You elect the quick method on your first GST/HST return. It takes effect at the start of the next reporting period. You can revoke it later, but you must stay on it for at least one full fiscal year.

One exception to the quick method: capital equipment purchases over $30,000 (before HST) still qualify for a full ITC even under the quick method. If you buy a $40,000 vehicle for business use, you claim the ITC on it normally and apply the quick method to everything else.

Our team at Tohme Accounting runs both calculations during your first HST filing to determine which method saves more. For most of our self-employed clients, the quick method wins, but the answer depends on your expense profile.

What Happens If You Should Have Registered but Did Not

The CRA can go back and assess the HST you should have collected from the date you lost small supplier status. This means you owe the CRA 13% on every dollar of taxable revenue from that date forward, whether or not you actually charged your clients.

Under ETA section 296, the CRA has four years from the date a return was due to assess you. If you crossed the $30,000 threshold in March 2024 but did not register until September 2026, the CRA can assess HST on everything you billed from March 2024 onward.

The math is painful. On $80,000 in revenue earned between March 2024 and September 2026, that is $10,400 in HST you owe. You never collected it from your clients, so it comes out of your pocket. You may be able to claim ITCs on your expenses during that period to offset some of it, but you need documentation for every expense.

On top of the HST itself, the CRA charges interest from the original due dates and may apply a late-filing penalty of 1% of the amount owing plus 0.25% per month, up to a maximum of 12 months.

If you suspect you should have registered but did not, contact a CPA before the CRA contacts you. The Voluntary Disclosure Program may apply in some situations, and correcting the issue proactively is always better than waiting for a CRA assessment. Our team at Tohme Accounting handles late registrations and back-filing regularly.

Do You Charge HST to US Clients?

If you are a Canadian self-employed professional providing services to clients outside Canada, you generally do not charge GST/HST on those services. The supply is considered “zero-rated” under ETA Schedule VI, Part V.

This is another reason voluntary registration can make financial sense. If a significant portion of your revenue comes from US or international clients, you collect zero HST on those invoices but you still claim full ITCs on your Canadian business expenses. The result is a net refund from the CRA every filing period.

A web developer in Toronto who earns $60,000 from US clients and $20,000 from Canadian clients would charge HST only on the $20,000 ($2,600 collected). If their Canadian business expenses total $15,000, their ITCs are $1,950. They remit $650 to the CRA ($2,600 – $1,950) but the real benefit is that they claimed $1,950 in ITCs on expenses they would have otherwise absorbed.

The rules on place of supply are specific. Services performed in Canada for a non-resident who is outside Canada at the time are generally zero-rated. Services related to Canadian real property or tangible personal property located in Canada are not zero-rated, even if the client is in the US. If you serve both Canadian and US clients, the classification matters for every invoice. We help our clients at Tohme Accounting set up their invoicing to handle this correctly from the start.

De-Registration: When to Cancel Your GST/HST Account

If your revenue drops below $30,000 for four consecutive quarters, you can apply to cancel your GST/HST registration and return to small supplier status. The CRA processes this through Form RC145.

Before de-registering, consider two things. First, you lose the ability to claim ITCs on your business expenses. If you still have significant business costs, those ITCs may be worth more than the administrative effort of filing HST returns. Second, de-registering triggers a self-assessment on any inventory, capital property, and supplies you had on hand at the time of de-registration. You may owe HST on items you previously claimed ITCs on.

In most cases, if your business is still active and you expect revenue to grow back above $30,000, staying registered is the simpler and more cost-effective choice. De-registration makes sense when you are winding down the business or transitioning to employment.