GST/HST Registration for Sole Proprietors and Corporations: The Complete Guide

Both sole proprietors and corporations must register for GST/HST once total worldwide taxable revenues exceed $30,000 in a single calendar quarter or across four consecutive calendar quarters. Registration is mandatory within 29 days of crossing the threshold. Taxi operators and commercial ride-sharing drivers must register regardless of revenue.

GST/HST registration for sole proprietors and corporations is one of the most consequential early tax decisions a Canadian business owner makes, yet it is also one of the most misunderstood. Sole proprietors assume they are too small to matter. New corporations assume registration happens automatically at incorporation. Neither assumption is correct, and both can lead to significant CRA liability.

This guide covers everything a business owner needs to know: when the GST/HST registration obligation arises, how to register, how business structure affects your obligations, and what compliance looks like once you are registered.

What Is GST/HST?

GST is the Goods and Services Tax, a 5% federal tax imposed on most taxable supplies of goods and services made in Canada. HST, the Harmonized Sales Tax, combines the federal GST with a provincial component in participating provinces. In Ontario, the HST rate is 13%. Other participating provinces have different rates: Nova Scotia, New Brunswick, Prince Edward Island, and Newfoundland and Labrador each charge 15% HST.

In non-participating provinces, Alberta, British Columbia, Manitoba, Saskatchewan, and Quebec, businesses charge GST at 5% only. Those provinces administer their own provincial sales taxes separately.

Not all supplies are taxable at the standard rate. Zero-rated supplies, such as basic groceries, prescription drugs, and most exports, are technically taxable but at 0%. This means registered businesses still file returns but collect no GST/HST on those sales, and they can still claim Input Tax Credits (ITCs) on business purchases related to those zero-rated supplies. Exempt supplies, such as most healthcare services and long-term residential rent, fall outside the GST/HST system entirely: no tax is charged, and no ITCs can be claimed on related inputs.

When Must You Register for GST/HST? The $30,000 Threshold Explained

The Small Supplier Rule

The Canada Revenue Agency (CRA) classifies a business as a "small supplier" if its total worldwide taxable revenues are $30,000 or less. More precisely, you remain a small supplier as long as your total taxable revenues do not exceed $30,000 in any single calendar quarter, and do not exceed $30,000 in the last four consecutive calendar quarters combined. Public service bodies, charities, municipalities, and qualifying non-profit organisations, have a higher threshold of $50,000.

Small suppliers are not required to register for GST/HST. They may choose to register voluntarily, and there are good reasons to do so, but the obligation does not arise until they exceed the threshold.

The Mandatory Registration Trigger

Once your total taxable revenues cross $30,000 in a single quarter or over four consecutive quarters, you are no longer a small supplier. At that point, you must register for a GST/HST account within 29 days of the sale that caused you to exceed the threshold.

The threshold calculation is not just about your revenues in isolation. The CRA aggregates revenues across associated persons, related corporations, or a sole proprietor and their associated entities. If your holding company and operating company are associated, their revenues count together toward the $30,000 threshold.

What Counts Toward the Threshold

All revenues from taxable supplies of goods and services made worldwide count toward the $30,000 threshold. Three categories are specifically excluded: revenues from financial services, proceeds from the sale of capital property, and goodwill received on the sale of a business.

Mandatory Registration Regardless of Revenue

Certain businesses must register even if they are small suppliers. Taxi operators and commercial ride-sharing drivers, including those providing services through platforms such as Uber or Lyft, must register for GST/HST regardless of their revenue level. This rule has applied to commercial ride-sharing since July 1, 2017. The $30,000 threshold simply does not apply to these services.

Should You Register Voluntarily Before Reaching $30,000?

Voluntary registration is available to any small supplier engaged in commercial activities in Canada. Choosing whether to register voluntarily is a genuine business decision, not an obvious one.

The Case for Registering Early

The primary benefit of voluntary registration is the ability to claim Input Tax Credits. When your business purchases goods or services for commercial use, office rent, software, equipment, professional fees, vehicle expenses, you pay GST/HST on those purchases. A registered business can recover that tax through ITCs claimed on its GST/HST return. For businesses in their startup phase, with significant upfront costs and relatively modest early revenues, this recovery can be material.

Voluntary registration also makes practical sense when your customers are other businesses. If you sell primarily to GST/HST-registered companies, they can claim back whatever GST/HST you charge them. The tax is cost-neutral to your clients, and your registration signals that you are a legitimate, established business. Many larger corporations prefer to deal with registered suppliers precisely because it simplifies their own ITC claims.

Registering before you hit the threshold also avoids a disruptive mid-year transition. If your revenues are climbing toward $30,000, registering proactively means you are not scrambling to register, begin charging tax, and change your invoicing simultaneously at a busy moment. It also eliminates the risk of inadvertently exceeding the threshold without registering, an error that can result in retroactive liability for all GST/HST that should have been collected.

The Case Against Registering Early

The tradeoffs are real. Registration adds ongoing administrative obligations: you must file returns on schedule, track ITCs, maintain proper invoices, and remit collected GST/HST to the CRA. For a very small business selling primarily to individual consumers, adding GST/HST to prices may create a competitive disadvantage if comparable small suppliers are not registered. If your business expenses are low and the ITCs you would claim are minimal, the compliance burden may outweigh the financial benefit.

This decision is worth discussing with a tax lawyer or accountant who can evaluate your specific situation, your expense levels, your client base, your revenue trajectory, and your capacity to manage the administrative load.

GST/HST Registration for Sole Proprietors vs. Corporations: Key Differences

The mandatory registration threshold, $30,000 in taxable revenues, is identical for sole proprietors, partnerships, and corporations. Business structure does not change when registration becomes mandatory. What does change is who registers, and what happens when you transition from one structure to the other.

Sole Proprietorship: Registering as an Individual

A sole proprietor and their business are the same legal person. When a sole proprietor registers for GST/HST, they register using their personal Social Insurance Number (SIN) along with their business details. The CRA issues a Business Number (BN) tied to the individual's identity, and the GST/HST account is an RT sub-account attached to that BN.

Because the sole proprietor is personally the registrant, the owner is personally responsible for all GST/HST collected and remitted. If the business collects $10,000 in HST from clients and fails to remit it, that is a personal obligation, there is no corporate shield.

The sole proprietor's revenues from all their businesses are also aggregated for threshold purposes. If you operate two separate sole proprietorships, their combined revenues are counted toward the $30,000 threshold.

Corporation: Registering as a Separate Legal Entity

A corporation is a distinct legal person. When a corporation registers for GST/HST, it registers in its own name, with its own Business Number, and its own RT account. The directors and shareholders are generally not personally liable for the corporation's GST/HST obligations, though directors can face personal liability in specific circumstances involving failures to remit payroll deductions or GST/HST under certain provisions of the Excise Tax Act.

Each corporation registers separately. If a business owner has a holding company and an operating company, both may need their own GST/HST accounts (unless they form an approved GST/HST group registration). The $30,000 threshold applies to each entity's revenues, but associated corporations' revenues are aggregated.

What Happens When You Incorporate: A Critical Transition

One of the most common GST/HST mistakes business owners make occurs when transitioning from sole proprietorship to corporation. When you incorporate, the new corporation is a separate legal entity with no automatic connection to your former sole proprietorship's tax accounts. The GST/HST account you had as a sole proprietor does not transfer to the corporation.

The correct approach is to close the sole proprietorship's GST/HST account by filing a final return covering all activity up to the effective date of incorporation, and then registering the new corporation for its own GST/HST account. Any Input Tax Credits accumulated under the sole proprietorship account, and any outstanding remittances, remain with that account, they do not carry over. This is a clean break, and failing to manage it properly can create filing gaps and compliance issues with the CRA.

Professional Corporations

Regulated professionals, lawyers, accountants, physicians, dentists, engineers, often incorporate as Professional Corporations (PCs). A PC registers for GST/HST as a corporation, not as an individual. However, the taxability of the services provided through the PC depends on the nature of those services. Some professional services, particularly in healthcare, are GST/HST-exempt. Confirm whether the specific services provided through a professional corporation are taxable, zero-rated, or exempt before assuming any particular registration or collection obligation.

How to Register for GST/HST: The Step-by-Step Process

Where to Register

Registration is done online through the CRA's Business Registration Online (BRO) portal at canada.ca. As of November 3, 2025, the CRA no longer accepts business number or GST/HST account registrations by phone, online registration is now mandatory.

What You Will Need

Before you begin, gather the following:

• Your Business Number (BN), if you already have one; if not, one will be assigned during registration
• Business name and legal structure (sole proprietorship, corporation, partnership)
• Business physical and mailing addresses
• Description of your principal business activities
• Social Insurance Number (for sole proprietors)
• Estimated annual revenues from taxable supplies
• Fiscal year start date

The Registration Process

The online registration takes approximately 15 to 20 minutes. You log in with your CRA My Business Account credentials, or create an account if you do not already have one, and select the option to register for a GST/HST account.

If you do not yet have a Business Number, one is assigned automatically during the process. Your GST/HST account number is formatted as a nine-digit BN followed by "RT" and a four-digit reference number, for example, 123456789RT0001.

Save or print your BN and GST/HST account number immediately during your online session. The system does not send a confirmation email with this information, and you will need it for every return and invoice you issue going forward.

Effective Date of Registration

For mandatory registration, the effective date is determined by when you crossed the threshold, not by when you submit the registration. If you exceeded $30,000 on October 15, you had until November 13 to register, and your effective date is October 15 or the date of the triggering sale. You must collect and remit GST/HST on all taxable supplies made from the effective date forward.

For voluntary registration, the effective date is generally the date you request registration, or up to 30 days earlier if you choose.

After Registration

Once registered, you must begin collecting GST/HST on all taxable supplies from your effective date. For Ontario businesses, this means charging 13% HST on most supplies to Ontario customers. Your GST/HST registration number must appear on all invoices over $30.

GST/HST Compliance After Registration: Your Ongoing Obligations

Registration is the beginning, not the end. Once registered, you have a series of ongoing compliance obligations that continue for as long as you hold the account.

Collecting GST/HST

You must collect GST/HST on every taxable supply you make from your effective registration date. Ontario registrants charge 13% HST on taxable supplies made to Ontario customers.

Every invoice must include specific information to be CRA-compliant. The CRA uses three tiers based on the total sale amount. For sales under $30, minimal information is required. For sales between $30 and $150, the invoice must show your business name, the date, the total charged, and your GST/HST registration number. For sales over $150, additional requirements apply: a description of the goods or services, the unit price, the applicable GST/HST rate, and the GST/HST amount charged must all appear on the invoice. Maintaining proper invoices is not only a collection requirement, it is also how you support your customers' ITC claims, which matters for B2B relationships.

Filing GST/HST Returns

Your filing frequency is determined by your annual taxable revenues:

Annual filers must file their return and remit any amount owing no later than three months after the end of their fiscal year. Sole proprietors who also have personal business income for income tax purposes may have their payment deadline extended to April 30, although the filing deadline remains three months after fiscal year end. Monthly and quarterly filers must file and pay within one month of the end of each reporting period.

As of January 1, 2024, all GST/HST registrants, with limited exceptions for charities and selected listed financial institutions, are required to file electronically. You must file a return for every reporting period, even if you collected no GST/HST and have nothing to remit. A nil return is still a required filing.

Remitting GST/HST

Remittance is the difference between the GST/HST you collected from customers and the ITCs you are claiming for the period. If your ITCs exceed the GST/HST you collected, the CRA issues you a refund. If you owe more than you can recover through ITCs, you remit the difference.

An important nuance: you must remit GST/HST on amounts you have invoiced, even if your client has not yet paid you. GST/HST accounting generally operates on an accrual basis, not a cash basis. Payments of $10,000 or more to the CRA must be made electronically as of January 1, 2024.

Claiming Input Tax Credits

ITCs are the mechanism that makes the GST/HST system tax-neutral for businesses in commercial supply chains. When you pay GST/HST on purchases used for your commercial activities, rent, equipment, software, professional fees, vehicle costs, you can claim those amounts back as ITCs on your GST/HST return.

Eligibility requires that the purchase be used, consumed, or supplied in the course of your commercial activities. Personal expenses do not qualify. Expenses related to exempt activities do not qualify. Mixed-use expenses must be apportioned.

To claim an ITC, you must hold proper supporting documentation. Your supplier's invoice must show the supplier's name, their GST/HST registration number, the date, the total amount charged, and the amount of GST/HST. A receipt that simply says "tax included" without these details will not support an ITC claim.

ITCs can generally be claimed in the reporting period in which the purchase was made, or within four years for most registrants (two years for large businesses with over $6 million in annual taxable revenues).

Record Keeping

All GST/HST records, invoices issued, invoices received, contracts, returns filed, and remittances made, must be retained for six years from the end of the tax year to which they relate. The CRA may in some circumstances request that records be kept for longer. Records can be maintained in digital format provided they are complete, accurate, and accessible.

Penalties and Interest for Non-Compliance

Filing late when you owe GST/HST triggers a late-filing penalty. The base penalty is 1% of the outstanding balance, plus an additional 0.25% for each full month the return remains overdue, up to a maximum of 12 months. If you have no balance owing, for example, you are in a refund position, no late-filing penalty applies even if you file after your due date, although filing late without good reason is still not recommended.

Interest accrues daily on any balance owing from the due date until the date it is paid in full. The interest rate is the prescribed rate set quarterly by the CRA, compounded daily.

If you fail to register when required, the exposure is more serious. The CRA can assess all GST/HST that should have been collected since your mandatory registration date, regardless of whether you collected anything. You become personally liable (as a sole proprietor) or the corporation becomes liable for the full amount, plus penalties and interest. Ignorance of the obligation is not a defence.

The Quick Method: A Simplified Accounting Option for Small Businesses

For small businesses with annual revenues (including tax) of $400,000 or less, the CRA offers an optional simplified accounting approach called the Quick Method. Instead of tracking every ITC and calculating the precise difference between tax collected and tax paid on inputs, businesses using the Quick Method remit a fixed percentage of their total GST/HST-included revenues to the CRA. The portion retained is intended to approximate the ITCs that would otherwise be claimed under the regular method.

The election is made by filing Form GST74 with the CRA. It takes effect on the first day of a GST/HST reporting period, and you must make the election by the due date of the return for the period in which you begin using it.

One important restriction: the Quick Method is not available to lawyers, accountants, actuaries, bookkeepers, financial consultants, or tax preparers. If you provide these services, you must use the regular accounting method regardless of your revenue level.

Frequently Asked Questions

Do I have to register for GST/HST as a sole proprietor in Canada?

You must register once your worldwide taxable revenues exceed $30,000 in any single calendar quarter or across the previous four consecutive quarters. Below that threshold, you are a small supplier and registration is optional. Voluntary registration lets you claim Input Tax Credits on business purchases, valuable in your startup phase or when your clients are other businesses.

Does incorporating my business automatically register me for GST/HST?

No. Incorporation and GST/HST registration are separate processes handled by different government bodies. Incorporating through ServiceOntario or Corporations Canada creates your corporation but does not open any CRA program accounts. If you were previously a registered sole proprietor, close that account separately and register the new corporation for its own GST/HST account.

What is the difference between GST and HST in Ontario?

GST is the federal 5% Goods and Services Tax. Ontario uses the Harmonized Sales Tax (HST) at 13%, combining the 5% federal GST with an 8% Ontario provincial component. Ontario businesses charge 13% HST on most taxable supplies to Ontario customers, rather than the 5% federal rate alone.

Can I register for GST/HST before reaching the $30,000 threshold?

Yes. Voluntary registration is available to any small supplier engaged in commercial activities in Canada. Your effective date is generally the date you request registration or up to 30 days earlier. Once registered voluntarily, you have the same obligations as a mandatory registrant, you must collect, remit, and file on schedule.

How often do I need to file GST/HST returns?

Filing frequency depends on annual taxable revenue: annual for businesses up to $1.5 million, quarterly for $1.5 million to $6 million, and monthly for over $6 million. You must file for every reporting period, even a nil return with no GST/HST activity. Electronic filing is mandatory for most registrants as of January 1, 2024.

What happens if I do not register for GST/HST when required?

The CRA can assess all GST/HST that should have been collected since your mandatory registration date, plus late penalties and interest. You may owe significant amounts you never collected from clients. Directors of corporations can face personal liability in some circumstances. Contacting the CRA proactively when you realise registration was required can reduce the consequences.

Do I charge HST on services I provide to clients outside Ontario?

It depends on the place of supply rules under the Excise Tax Act. Services provided to Ontario clients are generally subject to 13% HST. Services for clients in Alberta (a non-participating province) attract 5% GST only. Cross-border place of supply rules are complex, and professional advice is recommended for businesses serving clients in multiple provinces or internationally.

What records must I keep for GST/HST purposes?

Keep all invoices issued, invoices received, contracts, and filed GST/HST returns for at least six years from the end of the relevant tax year. Invoices must show the supplier's name, GST/HST registration number, date, total amount charged, and GST/HST amount. These records support your ITC claims and are the first thing CRA will request in an audit.

Sources & Official Resources

Federal Statutes

1. Excise Tax Act (Canada), GST/HST provisions

CRA Guidance, Registration

2. When to register for and start charging the GST/HST, Canada.ca
3. Register for a GST/HST account, Canada.ca
4. Register voluntarily for a GST/HST account, Canada.ca
5. Small suppliers, Canada.ca

CRA Guidance, Filing & Compliance

6. Reporting requirements and deadlines, Canada.ca
7. GST/HST filing penalties, Canada.ca
8. Input tax credits, Canada.ca
9. GST/HST records to keep, Canada.ca

CRA Guidance, Accounting Methods

10. Quick Method of Accounting for GST/HST (RC4058), Canada.ca

Contact Hadri Law

GST/HST obligations, from the moment registration becomes required through every filing period thereafter, require getting the details right from the start. Whether you are a sole proprietor approaching the $30,000 threshold, a newly incorporated business setting up your first GST/HST account, a business navigating the transition from sole proprietorship to corporation, or an established company dealing with a compliance question, Hadri Law's corporate and tax team is available to advise you.

Martina Caunedo, Hadri Law's tax lawyer, brings over 12 years of international tax experience, including work on CRA audits, objections, and Tax Court matters. Nassira El Hadri and Nicholas Dempsey advise on corporate structure and the business decisions that determine your GST/HST obligations from the ground up.

Call (437) 974-2374 to schedule a free initial consultation. You can also book directly at calendly.com/hadrilaw/free-consultation. Hadri Law serves clients in English, French, Spanish, and Catalan.

This article provides general information and is not legal advice. Every situation is different. Contact a qualified lawyer or accountant to discuss your specific circumstances.

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