How to Register for GST/HST in Canada: A Step by Step Guide

Last updated August 2026.

There is a line in Canadian tax that most owners cross without noticing. One quarter you are a small business quietly invoicing without sales tax, and the next you owe the government money you never collected. The line is $30,000, and the part that catches people is that the CRA decides when you crossed it, not you.

We spent years in the CRA’s audit division before starting Better Books Canada, and GST/HST registration files were rarely about fraud. They were about timing. Someone had a good year, kept sending the same invoice template they had always sent, and found out eighteen months later that the tax should have been on it. So here is the whole process, in order, with the dates that actually matter.

The short answer

You have to register for GST/HST once you stop being a small supplier, which for most businesses means your worldwide taxable revenue passes $30,000 over four consecutive calendar quarters. You register for a business number and a GST/HST program account through Business Registration Online, then you start charging tax on your effective date of registration.

That effective date is the important one. It can sit weeks before the day you actually complete the registration, and the CRA sets it from the rules rather than from your calendar. Everything below is built around getting that one date right.

Who has to register for GST/HST

You have to register if both of these are true: you are not a small supplier, and you make taxable sales, leases or other supplies in Canada. If everything you sell is exempt, you generally cannot register at all. The CRA sets this out on its page covering when to register for and start charging the GST/HST.

What the $30,000 threshold actually counts

This is where most of the damage happens, because the number is not what people assume.

It is revenue, not profit. The CRA counts the total amount of all revenues before expenses from your worldwide taxable supplies, including zero rated supplies. A business with $80,000 of billings and $55,000 of costs is well past the threshold, even though only $25,000 landed in the owner’s pocket.

It includes your associates. If you and a related business are associated at the beginning of the calendar quarter, their taxable revenue counts toward your total too.

If you are a sole proprietor, it covers everything you do. All of your businesses under that one name go into the same pile. Two side ventures at $18,000 each are not two small suppliers, they are one business at $36,000.

What does not count: revenue from financial services, sales of capital property, and goodwill from the sale of a business.

This one catches creators constantly, because sponsorship payments, platform revenue and affiliate income all count toward the same threshold. If that is your situation, our guide to content creator write offs in Canada covers how the CRA sees that income.

Four consecutive calendar quarters, not a calendar year

The test rolls. A calendar quarter is a three month period starting on the first day of January, April, July or October, and the CRA looks at the previous four consecutive quarters, not at your fiscal year and not at January through December.

So a business that bills $12,000 in each of the last two quarters of one year and $12,000 in the first quarter of the next has crossed $30,000, even though no single calendar year total reached it.

The three ways you cross the line, and the date each one gives you

There are exactly three outcomes, and each sets a different effective date of registration.

You pass $30,000 in a single calendar quarter. You stop being a small supplier on the supply that took you over. Your effective date of registration is no later than that day, and you have to charge GST/HST on that very sale. A contractor who bills $9,000 in each of two quarters and then lands one $40,000 job in the third has to put tax on the $40,000 invoice itself.

You pass $30,000 over four or fewer consecutive quarters, but not inside a single quarter. You stop being a small supplier at the end of the month following the quarter in which you crossed. Your effective date is no later than the day of your first supply after that. A consultant billing $9,000 a quarter reaches $36,000 at the end of the fourth quarter, stops being a small supplier on January 31, and charges tax starting with her first invoice after that date.

You stay under $30,000 across four consecutive quarters. You are a small supplier. You do not have to register, and you may choose to register voluntarily.

In every case where you have to register, you have 29 days from your effective date of registration to get it done. That is the deadline nobody knows about, and it is short.

Who has to register from day one

Two situations skip the threshold entirely. A self employed taxi driver or a commercial ride share driver has to register even as a small supplier, effective the day they start supplying taxable passenger transportation services. Non residents in certain situations, including some cross border digital sales and some events held in Canada, also have to register regardless of size.

Should you register before you have to?

Voluntary registration is real and often smart. If you make taxable supplies in Canada, you can register even as a small supplier, and your effective date is usually the day you request the account, or up to 30 days before that day.

Register early when you are spending before you are earning. Equipment, software, professional fees, a build out, inventory: once you are registered you recover the GST/HST paid on purchases used in your commercial activity through input tax credits. A small supplier who is not registered recovers none of it. It is a sunk cost.

Register early when your customers are other registered businesses. They claim back whatever you charge them, so your price does not really move.

Wait when you sell to consumers. Adding 13 percent to a retail price in Ontario makes you 13 percent more expensive to someone who cannot recover a cent of it. That is a genuine competitive cost, and it is the one case where staying a small supplier is worth protecting. Food service is the exception worth knowing about, because the Ontario rebate on prepared food takes qualifying orders of $4.00 or less down to 5 percent.

Either way, understand that registration is not a trial. Once you have an account you file returns for every reporting period, even the ones with no sales, until you close it. It is also the point to decide how you will calculate what you remit, because an eligible small business can elect the GST/HST quick method and skip tracking credits on most purchases.

How to register for GST/HST, step by step

Step 1. Work out your effective date before you touch the form

Pull your revenue by calendar quarter for the last four quarters and find the day you crossed, or decide the day you want if you are registering voluntarily. The form asks for this date, and it drives everything after it. Getting it right at this stage costs you ten minutes. Getting it wrong costs you a reassessment.

Step 2. Gather what the CRA will ask for

For the business number itself: the name, title, phone number and Social Insurance Number of the owners, your legal and operating business names, your mailing and physical addresses, the type of business, a description of your major activity, your main products or services with an estimated percentage of revenue for each, and your incorporation date, jurisdiction and certificate number if you are incorporated.

For the GST/HST account specifically: your annual worldwide and domestic taxable sales, your effective date of registration, your fiscal year end, and your reporting period.

Step 3. Check whether you already have a business number

Plenty of owners register for a second one by accident. You may already have a business number if you incorporated federally, if you registered or incorporated in certain provinces or territories, or if you have registered anything with the CRA before. One can even have been created if you started a registration online and the session timed out. If you already have one, you use it to add the GST/HST program account rather than starting over.

Step 4. Register through Business Registration Online

Online is the fastest route, and you can register for the business number and the GST/HST account in the same session, along with payroll and corporation income tax accounts if you need them. If the payroll account is the one you need, our guide to payroll for your first employee covers what comes next.

One change worth knowing about: as of July 14, 2026, Business Registration Online is only available through your CRA account, so you have to sign in to use it. The CRA sets out the current process on its page for registering as a resident with a Canadian business. If you genuinely cannot complete the registration online, the fallback is Form RC1 by mail to your tax centre, which is considerably slower.

Step 5. Choose your fiscal year end and reporting period

The CRA assigns a reporting period based on your annual taxable supplies. Annual taxable supplies of $1,500,000 or less get an annual period. More than $1,500,000 up to $6,000,000 gets quarterly. More than $6,000,000 gets monthly. Settle this once if you can, because the number of times an account switches between monthly, quarterly and annually is a named input in the risk model behind what triggers a CRA audit.

You can ask to file more often than you are assigned, and for a lot of new registrants that is the better call. Filing quarterly forces you to move the money out four times a year instead of once, which is the single most effective habit for not spending tax you collected. If you want the wider picture of how this fits with everything else, start with our small business bookkeeping basics.

Step 6. Start charging the right rate on your effective date

The rate depends on the place of supply, meaning where you make the sale, not where your office is. As confirmed on the CRA’s page on charging and collecting the GST/HST, the current rates are 13 percent in Ontario, 15 percent in New Brunswick, Newfoundland and Labrador and Prince Edward Island, 14 percent in Nova Scotia, and 5 percent GST in Alberta, British Columbia, Manitoba, the Northwest Territories, Nunavut, Quebec, Saskatchewan and Yukon. Several of those provinces add their own provincial sales tax on top, administered separately.

What changes the day your registration takes effect

Your invoices have a job to do now

Your customers cannot claim an input tax credit unless your invoice carries the right information, and the requirements scale with the size of the sale.

Under $100, you need your business or trading name, the invoice date, and the total amount. From $100 to $499.99, add an indication of the GST/HST charged, the status of each supply where the invoice mixes taxable and exempt items, and your GST/HST registration number. At $500 or more, add the buyer’s name, a brief description of what was supplied, and the terms of payment.

That works in both directions. When you claim an input tax credit, your supplier’s invoice has to meet the same standard, and this is precisely the kind of thing a reviewer tests first. It sits on top of the record keeping requirements for your business that already apply.

You file electronically, and there is a penalty if you do not

All GST/HST registrants except charities and selected listed financial institutions have to file returns electronically for reporting periods ending in 2024 and later. Filing on paper anyway costs $100 the first time and $250 for each return after that.

You now own a filing deadline

If you file monthly or quarterly, your filing and payment deadline is one month after the end of the reporting period. A quarter ending March 31 is due April 30.

If you file annually, it is generally three months after your fiscal year end. There is one exception most small businesses fall into: if you are a sole proprietor with a December 31 fiscal year end who had business income for the year, your payment deadline is April 30 and your filing deadline is June 15. The payment comes six weeks before the return, which surprises people every single spring.

Annual filers also need to watch instalments. If your net tax for the previous fiscal year was $3,000 or more, you may have to make quarterly instalment payments during the current year. Both sets of dates are on the CRA’s page for GST/HST reporting requirements and deadlines, and keeping them straight is most of what our HST and GST tracking and filing service exists to do.

Filing late has a formula

The late filing penalty is A plus (B times C), where A is 1 percent of the amount owing, B is 25 percent of A, and C is the number of complete months the return is overdue, to a maximum of 12. Nothing is charged if you owe nothing or you are due a refund. Ignoring a formal demand to file adds a flat $250 on top.

What we watched go wrong from the other side of the table

Five patterns came up again and again in the files we reviewed, and none of them involved anyone trying to cheat.

The gap between the effective date and the registration date. This is the expensive one. Someone crosses the threshold in May, registers in November, and assumes the clock starts in November. It does not. The tax that should have been on the May through October invoices is still owed, and now the choice is going back to clients to ask for another 13 percent or absorbing it. Most owners absorb it.

Counting profit instead of revenue. Covered above, still the most common single error.

Counting a calendar year instead of four rolling quarters. A business can sail under $30,000 in both of two calendar years and still have crossed the threshold in the middle.

Forgetting the second business. One person, two ventures, one threshold.

Spending the tax. Collected GST/HST was never your revenue. It is the government’s money sitting in your account, and treating it as cash flow is how a manageable filing becomes a payment arrangement. If you want to know what a reviewer actually pulls when a file gets selected, we wrote up what auditors look for during a CRA audit.

If your business is in Quebec

Quebec runs its own administration. If your business is physically located there, the GST/HST is administered by Revenu Québec, so you register and file your GST/HST returns with them, on their forms, alongside the QST. The federal rules on who has to register are the same, but the door you walk through is different.

The reverse case matters too. An Ontario business with no Quebec address can still be pulled into the QST system by its Quebec customers, which we cover in Quebec tax obligations when you live in Ontario.

Frequently asked questions

What is the $30,000 GST/HST registration threshold?

It is the small supplier limit for most businesses. Once your total worldwide taxable revenue before expenses, including zero rated supplies and the revenue of any associates, passes $30,000 over four consecutive calendar quarters, you are no longer a small supplier and you have to register. It measures revenue, not profit.

Do I have to register for GST/HST if I earn less than $30,000?

Generally no. Under the threshold you are a small supplier and registration is optional, with two exceptions: self employed taxi drivers and commercial ride share drivers have to register from the day they start driving, which is also the day their vehicle costs start needing a logbook, and some non resident situations require it regardless of size. Registering voluntarily can still be worth it, because only registrants can claim input tax credits on their business purchases.

How long do I have to register after I cross the threshold?

You have 29 days from your effective date of registration. That effective date depends on how you crossed: if you passed $30,000 inside a single calendar quarter it is no later than the day of the sale that took you over, and if you passed it across several quarters it is no later than your first sale after the end of the month following that quarter.

Do I charge GST/HST on the sale that pushed me over $30,000?

If you crossed inside a single calendar quarter, yes. You stop being a small supplier on that supply, so the tax belongs on that invoice. If you crossed gradually across four consecutive quarters instead, you keep the small supplier treatment until the end of the month following that quarter, and the tax starts with your first sale after that.

What reporting period will the CRA give me?

It is assigned from your annual taxable supplies: annual filing at $1,500,000 or less, quarterly above $1,500,000 up to $6,000,000, and monthly above $6,000,000. Most new registrants land on annual, and many are better off electing to file quarterly so the tax leaves the bank account four times a year instead of once.

Not sure whether you have already crossed the line?

Send us your revenue by quarter for the last four quarters and we will tell you whether you had to register, what your effective date is, and what it takes to sort it out if that date has already passed. It is a short conversation and it is far cheaper than finding out during a review. You can get in touch whenever you are ready.