When Do You Have to Register for HST in Ontario?
Published 18 September 2026. Last updated 18 September 2026.
You invoiced $4,000 in January, a few thousand more each month through the spring, and by the end of September your bookkeeping app shows $30,700. Somewhere in that stretch you stopped being a small supplier. Nobody sent you a letter about it.
CRA does not flip the switch for you. The date your obligation starts is one you work out from your own sales records, and if you miss it you still owe the tax, even on invoices where you never charged a cent. Below is the threshold, the two timing rules that decide your date, and what to do if you are already past it. If you would rather hand the whole thing off, start with HST filing in Toronto.
Bottom Line Up Front
- You must register once your worldwide taxable supplies pass $30,000 over four consecutive calendar quarters, counting all your businesses and those of your associates (CRA, 2025).
- It is a rolling test. The four quarters need not match a calendar year, and the clock never resets on January 1.
- Pass $30,000 inside a single quarter and you must charge HST on the very invoice that took you over, before your registration comes through.
- Pass it across four quarters without exceeding it in any one, and you stay a small supplier until the end of the month after that quarter ends.
- You get 29 days from your effective date to register. If you are already late, you still owe the HST you should have collected.
On this page
- The $30,000 threshold
- The part almost everyone gets wrong
- The two timing rules
- Worked example
- What counts as a taxable supply
- The Ontario rate and place of supply
- Should you register early?
- If you should have registered months ago
- How to register
- What changes in your books
- Common Questions
The $30,000 threshold, in plain terms
You have to register for GST/HST once your total taxable supplies exceed $30,000 over four consecutive calendar quarters. Below that, CRA calls you a small supplier and registration is optional (CRA, 2025). A calendar quarter is a three month block starting January 1, April 1, July 1 or October 1. Your own fiscal year end does not change that.
The number CRA wants is bigger than most people assume. You include all revenues before expenses, from your worldwide taxable supplies, from all your businesses and those of your associates, leaving out supplies of financial services, sales of capital property, and goodwill from the sale of a business (CRA, 2025). The $8,000 you billed a client in Michigan counts. The side business counts. Your expenses do not reduce it.
Some organizations get a different number:
| Who you are | Threshold | Test |
|---|---|---|
| Most businesses and self-employed people | $30,000 | Taxable supplies over four consecutive calendar quarters |
| Public service bodies (non-profits, municipalities, universities, school and hospital authorities) | $50,000 | Taxable supplies over four consecutive calendar quarters |
| Charities and public institutions | $50,000 | Taxable supplies test, or the gross revenue test below |
| Charities and public institutions | $250,000 | Gross revenue of $250,000 or less in a previous fiscal year |
Source: CRA, When to register for and start charging the GST/HST, 2025.
One group the threshold does not protect at all: if you drive a taxi or supply commercial ride-sharing services, CRA deems you a taxi business and you have to register from your first fare (CRA, 2025).
Pull your sales by quarter, not by year, before you do anything else.
The part almost everyone gets wrong
The four quarter test is rolling, not annual. This is the most common reason a careful business owner ends up registering eight months late.
People hear “$30,000 a year” and check their December 31 total. CRA is not looking at your calendar year. It looks at every set of four consecutive quarters, which is a fresh test every three months: the four ending September 30, 2025, the four ending December 31, 2025, the four ending March 31, 2026.
So a business that bills $28,000 in 2024 and $29,000 in 2025 has never had a $30,000 calendar year, and can still have gone past the threshold in the four quarters running July 2024 to June 2025. Nothing on your T1 or T2 will tell you. Only quarterly totals will.
Two other details catch people. The test counts worldwide supplies, so foreign clients are in, and it counts associates, so if you and a spouse or a holding company control more than one business, CRA looks at the group.
Set a reminder for the first week of January, April, July and October to total the previous four quarters. It is the only early warning you get.
Two timing rules, and which one applies to you
There are two separate rules and they produce very different dates. Which one you are under depends on how you crossed $30,000.
| How you crossed $30,000 | When small supplier status ends | Effective date of registration | Deadline to register |
|---|---|---|---|
| Exceeded $30,000 in one calendar quarter | Immediately, on that supply | No later than the day of the supply that took you over | 29 days after that day |
| Exceeded $30,000 over four consecutive quarters, not in any single one | End of the month following that quarter | No later than the day of your first supply after that | 29 days after that day |
Source: CRA, 2025.
If you cross $30,000 in a single calendar quarter
You stop being a small supplier on the spot. Not at quarter end, not at month end. Your effective date of registration is no later than the day of the supply that made you exceed $30,000, and you have to charge GST/HST on that supply (CRA, 2025).
The invoice that takes you over is itself taxable. CRA’s registrant guide is blunt: charge the tax on the supply that put you over the limit even if you are not yet registered (CRA, 2025). This is the rule that catches the contractor who signs one $45,000 project after a quiet year.
If you cross it over four quarters, but not in any one
The slow version is kinder. You are no longer a small supplier at the end of the month following the quarter in which you exceeded $30,000, and your effective date is no later than the day of your first supply after that (CRA, 2025). If the quarter ending September 30 takes you past $30,000, you remain a small supplier through October 31, and your first November invoice is your first taxable one.
The 29 day rule
Either way, you must register within 29 days of your effective date (CRA, 2025). Those are two different dates. The effective date is when your obligations start. The 29 days is only how long you have to finish the paperwork. Work out which rule applies, write the effective date down, and count forward.
Worked example: a designer who crossed the line in September 2025
An Ontario freelance graphic designer, sole proprietor, billing from Toronto. Her taxable supplies by quarter:
| Quarter | Taxable supplies |
|---|---|
| Oct to Dec 2024 | $6,000 |
| Jan to Mar 2025 | $7,500 |
| Apr to Jun 2025 | $8,000 |
| Jul to Sep 2025 | $9,200 |
| Four quarter total | $30,700 |
She is over $30,000, but no single quarter came close, so the four quarter rule applies. She stops being a small supplier on October 31, 2025. Her effective date is her first November invoice, and she has 29 days from it to register.
She does not notice until her accountant asks in February 2026. Between November 1 and December 31, 2025 she invoiced $12,000 with no tax on it.
- HST she should have charged: $12,000 x 13% = $1,560
- HST she paid on business purchases in the same window (a $2,400 laptop and software): $2,400 x 13% = $312
- Net HST to remit: $1,560 minus $312 = $1,248
The $1,248 comes out of her pocket unless her clients accept a corrected invoice. The $312 is real money back, and it exists only because she is registered.
Example only, using 2025 rates and thresholds. Your dates and numbers will differ.
What counts as a taxable supply
Most of what you sell in Canada is taxable. CRA’s starting position is that most property and services supplied in or imported into Canada are subject to GST/HST (CRA, 2025). Supplies fall into three buckets:
| Category | You charge | Input tax credits? | Common Ontario examples |
|---|---|---|---|
| Taxable | 13% in Ontario | Yes | Consulting, design, IT contracting, trades, restaurants, retail, most professional services |
| Zero-rated | 0% | Yes | Basic groceries, exports, prescription drugs, certain medical devices, many international transportation services |
| Exempt | Nothing | No | Long-term residential rent and most resale housing, most health, medical and dental services by licensed practitioners, child care for kids 14 and under, educational and tutoring services, music lessons, financial and insurance services, legal aid |
Source: CRA, Type of supply, 2025.
Zero-rated supplies are still taxable supplies, taxed at 0%. They count toward your $30,000 and they do not cost you your input tax credits. An Ontario developer whose entire client list is in California is making zero-rated exports, may well be over the threshold, and is usually better off registered.
Exempt is the opposite. If everything you sell is exempt, you generally cannot register and cannot recover the tax on your own costs (CRA, 2025). Mixed cases, such as a dental office that also sells taxable cosmetic products, need the revenue split looked at properly. Sort last year’s revenue into those three columns before you test yourself against $30,000.
The Ontario rate, and why your customer’s province matters
In Ontario you charge 13% HST. The rate is not decided by where your desk is: it depends on the place of supply, meaning where you make the sale (CRA, 2025). For goods, that is generally the province where they are delivered. For services, it is generally the province of the recipient’s address where you obtain that address in the normal course of business (CRA, 2025).
| Province or territory | Rate | Type |
|---|---|---|
| Ontario | 13% | HST |
| New Brunswick, Newfoundland and Labrador, Prince Edward Island | 15% | HST |
| Nova Scotia | 14% | HST (reduced from 15% on April 1, 2025) |
| All other provinces and territories | 5% | GST only |
Source: CRA, GST/HST rates and place-of-supply rules, as of September 2026. Some provinces in the 5% row also charge their own provincial sales tax, which is administered separately and is not part of your CRA return.
So a North York bookkeeper with clients in Halifax, Calgary and Toronto charges 14%, 5% and 13% in the same week. Record each client’s province in your invoicing system now, so the right rate applies from day one.
Should you register before you have to?
Often, yes. A small supplier may register voluntarily if they make taxable sales, leases or other supplies in Canada (CRA, 2025). The reason is input tax credits.
Until you register, every dollar of HST you pay on equipment, software, professional fees and supplies is a sunk cost. Once registered, it becomes recoverable. There is also a transitional break: when you become a registrant you may claim credits for the GST/HST on property you hold at that time, including capital property, real property and inventory (CRA, 2025). For someone setting up a business who has just bought a van and a laptop, that is not a small number.
The trade-off, honestly:
- Your prices effectively rise 13% for customers who are not registered. Selling to the public, that is a real competitive hit. Selling to registered businesses, it is invisible, because they claim it back.
- You take on filing. Returns are due whether or not you had sales.
- Your credits are only as good as your receipts, so the bookkeeping has to get tighter.
- You are committed. CRA requires you to stay registered at least a year before you can cancel (CRA, 2025).
You can backdate a voluntary registration modestly: CRA generally accepts an effective date up to 30 days before the day you ask (CRA, 2025).
What if you should have registered months ago?
Start with the part nobody wants to hear. You still owe the HST you should have collected, even though you never charged it. Your obligations run from your effective date of registration, not from the day the paperwork clears, and CRA sets that effective date no later than the day of the supply that took you over (CRA, 2025). Everything you billed from that date on was a taxable supply whether or not you put the tax on the invoice.
The tax is not waived because the invoice went out clean. It becomes yours to remit out of your margin, unless clients accept a corrected invoice. Business clients often will, since they claim it back. Individual customers almost never do.
Then the additions. A late-filed return carries a penalty of A plus (B x C), where A is 1% of the amount owing, B is 25% of A, and C is the number of complete months the return is overdue, to a maximum of 12 (CRA, 2025). Ignoring a demand to file adds $250. Interest runs on top at the prescribed rate, set quarterly, which was 7% for the third quarter of 2026 (CRA, 2026).
Two things pull your way. Your input tax credits are claimable from your effective date, so the gross tax is not the real bill. And the Voluntary Disclosures Program exists for exactly this. An accepted unprompted application can receive 100% relief of applicable penalties and 75% relief of applicable interest; a prompted one receives up to 100% penalty relief and 25% interest relief (CRA, 2025).
The word doing the work is unprompted. The application also has to be complete, cover a period at least one reporting period past its due date, and come with payment or a payment arrangement for the estimated tax owing (CRA, 2025). CRA decides case by case, so nobody can promise you an outcome. The gap between the two tiers is why people move quickly once they understand it.
If returns are already outstanding rather than just missing, there is more detail in late HST returns, which covers what CRA does next.
Not sure which date your registration should have started? Ruby Tax has been filing HST returns for Ontario owner-operators out of North York for over ten years, and you talk to the person doing the work, not an account manager. Get a free quote or call 647-990-7258.
How to register, and what to choose while you are doing it
Registration hangs off a Business Number (BN). If you have one, you add a GST/HST account to it; if not, you get both at once. CRA describes Business Registration Online, which runs through your CRA sign-in, as the fastest and easiest way (CRA, 2025). You can also register by phone on CRA’s business enquiries line, 1-800-959-5525, Monday to Friday, 8 am to 8 pm Eastern (CRA, 2026).
Have ready: your name, social insurance number, date of birth and postal code; the business name and structure; names and SINs of any other owners; your addresses and main business activity; your effective date of registration; your fiscal year; and an estimate of annual revenue (CRA, 2025). The effective date is the field to get right, because it decides which returns you owe and from when.
CRA then assigns a reporting period:
| Annual taxable supplies | Assigned period | You may elect |
|---|---|---|
| $1,500,000 or less | Annual | Monthly or quarterly |
| More than $1,500,000 up to $6,000,000 | Quarterly | Monthly |
| More than $6,000,000 | Monthly | Nothing more frequent |
Source: CRA, Make changes to your GST/HST account, 2025. A more frequent period is elected on Form GST20 or through My Business Account.
Most new registrants default to annual. Quarterly is more work, and it is also the best defence against spending money that was never yours. Monthly and quarterly returns are due one month after the period ends (CRA, 2025).
What changes in your books the day you register
Three things, and the first is a habit rather than a rule. The HST you collect was never your money. Owners who move it to a second account the week they invoice rarely end up with a remittance problem. Those who leave it in the operating account often do.
Second, your invoices change. For your customer to claim an input tax credit, your paperwork has to carry set information, and the requirements step up with the size of the sale:
| Total amount | What the invoice or receipt must show |
|---|---|
| Under $100 | Your business or trade name, the date, and the total amount paid or payable |
| $100 to $499.99 | The above, plus your GST/HST registration number, the tax shown separately or a statement that tax is included, and the rate applied to each supply |
| $500 or more | The above, plus the customer’s name, the terms of payment, and a description of each supply sufficient to identify it |
Source: CRA, input tax credits, 2026. CRA notes on that page that under proposed changes as of April 20, 2021 these thresholds rose to $100 from $30 and to $500 from $150, so anything you read quoting $30 and $150 is working from the old figures.
Third, your own receipts become worth money. Every business purchase carrying HST is a potential credit, and the claim holds only if you kept the document. The general window to claim is four years from the end of the reporting period in which the credit first became available, shorter for some large and financial businesses (CRA, 2025). If your records are the reason this feels daunting, bookkeeping support is usually cheaper than the credits people lose without it.
A note on the Quick Method
If your expenses are modest, look at the Quick Method before you settle into a routine. You still charge customers the full 13% in Ontario, but you remit a lower flat percentage of your tax-included sales and skip tracking most input tax credits (CRA, 2025).
It is open where revenues including GST/HST from annual worldwide taxable supplies, counting associates, are not more than $400,000, and it carries a 1% credit on the first $30,000 of eligible supplies in a year. Accountants, bookkeepers, tax consultants, lawyers, actuaries, listed financial institutions, charities and municipalities cannot use it (CRA, 2025). You elect it on Form GST74. For a low-overhead service business it can be worth a few thousand dollars a year; for an equipment-heavy one it is usually worse than claiming real credits. That calculation belongs beside the question of whether to incorporate and file a corporate tax return instead.
Common Questions
Do I need to register if all my clients are in the United States?
Possibly, yes. Exports are zero-rated, so you charge 0%, but zero-rated supplies are still taxable supplies (CRA, 2025). They count toward the $30,000, and the test looks at worldwide supplies. Registering costs your American clients nothing while letting you recover HST on your Canadian costs.
I run two small businesses. Do I add them together?
Yes. The threshold includes revenues from your worldwide taxable supplies from all your businesses and those of your associates (CRA, 2025). Two sole proprietorships at $18,000 each are one owner at $36,000 for this test.
I registered late. Can I claim credits for the months before I registered?
Partly. Credits run from your effective date, which for a late registrant is backdated to the day you should have registered, so that catch-up window is generally claimable. For earlier periods, CRA allows credits on property you still held when you became a registrant, including capital property, real property and inventory, and on prepaid services or rent relating to the period after registration, but not before it (CRA, 2025).
I am self-employed and file annually. When is my HST return due?
Annual returns are normally due three months after your fiscal year end. There is an exception for individuals in business with a December 31 year end: payment is due April 30, the return is due June 15 (CRA, 2025). That is the same June 15 as your self-employed personal tax return, and the April 30 payment date is what surprises people.
What to do next
Total your taxable supplies by calendar quarter for the last two years, then add each set of four consecutive quarters. If any total is over $30,000, find the quarter where it happened, decide which timing rule applies, and write down your effective date. That one date drives everything: whether you are late, how many returns you owe, and what your options are.
If the date is in the past, the situation is fixable, and it gets cheaper the sooner you move, particularly while you can still come forward before CRA contacts you. The same is true of years of unfiled returns. What does not help is another quarter of invoices going out without the tax on them.
About the author
Raj is the principal of Ruby Tax, a CRA e-file certified tax and accounting practice at 250 Consumers Road in North York. He has spent over ten years preparing personal and corporate returns for clients across Canada, from first-time filers to incorporated businesses and franchise operators. A good share of that work is HST: registrations, catch-up filings, and the calls that begin with “I think I was supposed to register last year.”
This article is general information, not tax advice for your situation. Tax rules change and the right answer depends on your facts. Confirm anything here against current CRA guidance or talk to us before you act on it.
