GST/HST Registration and Compliance

The goods and services tax (GST) and the harmonized sales tax (HST) are value-added taxes imposed under the federal Excise Tax Act. A registered business charges the tax on its taxable sales, claims back the tax it pays on its own purchases through input tax credits, and remits the difference to the Canada Revenue Agency (CRA). The system is designed so that the tax ultimately falls on the final consumer, with registered businesses acting as collection agents along the way.

That collection-agent role is the source of most GST/HST problems. The tax a business charges is not its money — it is the Crown's money, collected on the government's behalf and held until it is remitted. Businesses that misjudge when they must register, that charge the wrong rate, that fall behind on filing, or that claim input tax credits they cannot support can find themselves facing assessments for tax they never collected, plus penalties and compounding interest. This page explains how registration and compliance work and where exposure tends to arise. It is general information about Canadian federal tax law, not legal advice for any particular situation.

The $30,000 small-supplier threshold

The threshold question for most businesses is whether they are a “small supplier.” Under section 148 of the Excise Tax Act, a person is generally a small supplier as long as their total worldwide taxable supplies (and those of their associates) do not exceed $30,000 in a single calendar quarter or over the previous four consecutive calendar quarters. A small supplier is not required to register for, charge, or remit GST/HST.

The $30,000 figure is measured on revenue from taxable supplies, not on profit, and it is tested two ways. First, if taxable supplies in a single calendar quarter exceed $30,000, the business ceases to be a small supplier immediately — effective on the supply that pushes it over the line. Second, if taxable supplies over four consecutive calendar quarters exceed $30,000 (without breaching the limit in any single quarter), the business loses small-supplier status after a one-month grace period. Because the test looks back over a rolling twelve-month window rather than a fixed fiscal year, a business can cross the threshold mid-year without noticing.

Two points commonly trip people up. The threshold counts taxable supplies made anywhere in the world, not just in Canada, and it aggregates the supplies of associated persons, so related entities cannot each shelter under a separate $30,000 limit. Certain businesses — notably taxi and ride-share operators — must register regardless of revenue and cannot rely on the small-supplier exemption at all.

Mandatory versus voluntary registration

Section 240 of the Excise Tax Act sets out who must register. In general, every person who makes a taxable supply in Canada in the course of a commercial activity must register, unless they qualify as a small supplier (or fall within a narrow set of exceptions). Once a business exceeds the small-supplier threshold, registration is mandatory, and the obligation to charge tax begins on the supply that took it over the limit — not on the day the business eventually gets around to registering.

A business that is still a small supplier may nonetheless choose to register voluntarily. There are real advantages to doing so. A registered business can claim input tax credits to recover the GST/HST it pays on start-up costs, equipment, inventory, and overhead — recovery that is unavailable to an unregistered small supplier. Voluntary registration can also matter where customers are themselves registered businesses that expect to receive a proper tax invoice. The trade-off is the administrative burden of charging tax, filing returns, and keeping records. Whether voluntary registration helps or hurts depends on the customer base, the margin on inputs versus outputs, and the cost of compliance, and it is a question worth working through before launch. Our page on business start-up planning addresses how this fits into the broader set of decisions a new business faces.

The cost of getting registration timing wrong is real. A business that should have registered but did not is still liable for the tax it should have charged. CRA can register the business retroactively and assess the net tax for the entire period it operated without registering — even though the business never collected that tax from its customers and may have no practical way to go back and recover it.

Place of supply: rate and jurisdiction

Canada does not have a single sales-tax rate. The GST applies at five percent across the country, but in the participating provinces the federal and provincial components are blended into a single HST at a higher combined rate that varies by province. Which rate a business must charge depends on the place of supply — the province in which the supply is treated as being made under the place-of-supply rules.

Those rules differ by the type of supply. For most sales of tangible goods, the place of supply is generally where the goods are delivered or made available to the customer. For services, the rules often look to the address of the recipient obtained in the ordinary course of business. Supplies of real property are generally taxed where the property is located, and intangible personal property has its own set of rules. The practical consequence is that a business selling into several provinces may have to charge different rates to different customers for the same product, depending on where each supply is delivered or used.

Place-of-supply errors are common and easy to make, particularly for businesses that sell online or across provincial lines. Charging five percent GST where HST of thirteen, fourteen, or fifteen percent applied leaves the business exposed for the shortfall, because the obligation to remit the correct amount does not depend on what the business actually charged the customer. Cross-border and inter-provincial supply questions can become intricate, and we address the international dimension in more detail on our page about GST/HST place of supply and cross-border issues.

Filing frequency, collecting, and remitting

Once registered, a business is assigned a reporting period — annual, quarterly, or monthly — that determines how often it files a GST/HST return and remits net tax. The default reporting period is tied to the business's annual taxable supplies: larger businesses report more frequently, while smaller registrants generally default to annual filing. A registrant can often elect to file more frequently than the default, which can help with cash flow where the business is regularly in a refund position because its input tax credits exceed the tax it collects.

For each reporting period, the registrant calculates its net tax: the GST/HST it collected (or was required to collect) on its taxable supplies, less the input tax credits it is entitled to claim on its eligible business purchases. Section 228 of the Excise Tax Act requires the registrant to calculate net tax for each period and to remit any positive balance with the return by the filing deadline. Where input tax credits exceed tax collected, the registrant claims a refund.

Two timing traps deserve attention. First, the obligation to charge and account for tax generally arises when the tax becomes payable on a supply — often when an invoice is issued or payment is due — not when the customer actually pays. A business that accounts for GST/HST only on a cash basis can therefore understate its liability. Second, GST/HST instalments may be required during the year for annual filers above a certain threshold, and missing instalments produces interest even where the final return is filed on time. Annual registrants in particular sometimes overlook the instalment obligation entirely.

The regular method versus the Quick Method

Most registrants account for net tax using the regular method: they track the actual GST/HST collected on sales, track the actual input tax credits on purchases, and remit the difference. This method captures the full benefit of input tax credits but demands careful record-keeping of every taxable purchase.

As an alternative, many smaller businesses can elect to use the Quick Method of accounting, available under the streamlined-accounting rules made under the Excise Tax Act. Under the Quick Method, the registrant still charges its customers GST/HST at the normal rate, but it remits only a prescribed percentage of its tax-included sales rather than tracking actual input tax credits on operating expenses. The remittance rate is lower than the rate charged, and the difference is meant to approximate the input tax credits the business would otherwise claim; a small annual credit on the first portion of eligible sales is also available. Input tax credits can still be claimed separately on capital purchases such as equipment.

The Quick Method is an election, and it is not open to every business — certain businesses (for example, many accountants, lawyers, and financial consultants) and businesses above a revenue ceiling are excluded, and the election generally must be made by a deadline tied to the reporting period. Whether it produces a better result than the regular method depends heavily on the business's cost structure. A service business with few taxable inputs often comes out ahead under the Quick Method, because it has few input tax credits to give up; a business with substantial taxable purchases relative to its sales usually does better tracking actual credits under the regular method. The choice should be modelled on the specific numbers rather than assumed, and it can be revisited as the business changes.

Non-resident registration

The reach of the GST/HST is not limited to businesses physically located in Canada. A non-resident person who makes taxable supplies in Canada in the course of carrying on business here is generally required to register on the same basis as a resident, subject to the small-supplier rules. Whether a non-resident is “carrying on business in Canada” for GST/HST purposes is a fact-specific question that turns on factors such as where contracts are made, where activities are performed, and the degree of the business's presence in Canada.

Non-resident registration carries some distinct features. A non-resident that registers may be required to provide and maintain security with CRA as a condition of registration, in an amount related to its expected net tax. In addition, separate simplified registration and remittance regimes apply to certain non-resident vendors and digital-platform operators that supply digital products and services, or that facilitate sales, to consumers in Canada — rules that have expanded significantly in recent years and that bring many foreign suppliers into the Canadian tax base even without a physical presence. Determining whether a non-resident must register, under which regime, and whether security is required is an area where early advice avoids costly retroactive exposure. These questions frequently overlap with broader cross-border tax planning.

Common compliance failures that create exposure

Most GST/HST assessments trace back to a handful of recurring failures. Understanding them is the most reliable way to avoid them.

• Registering late. A business that crosses the small-supplier threshold but keeps operating as though it had not is liable for the tax it should have charged from the day it ceased to be a small supplier. CRA can register it retroactively and assess the uncollected tax, often years later.
• Charging the wrong rate. Place-of-supply errors — charging GST where HST applied, or applying the wrong province's rate — leave the registrant on the hook for the difference, regardless of what it billed the customer.
• Failing to remit tax that was collected. Using collected GST/HST as working capital is one of the most serious failures in the system. The tax is the Crown's money, and unremitted amounts attract penalties, interest, and personal exposure for directors.
• Unsupported input tax credits. Claiming credits without the documentary support the rules require — or on expenses that are personal, exempt, or otherwise ineligible — is a frequent audit target. We address this directly on our page about input tax credit denials.
• Filing late or not at all. Late returns attract penalties and interest, and a chronic non-filer invites closer scrutiny across its whole account.
• Mishandling exempt and zero-rated supplies. Treating an exempt supply as taxable (or the reverse), or misclassifying a zero-rated supply, distorts both the tax charged and the credits claimed.

When these failures surface, they usually surface during a GST/HST audit, and the resulting assessment can cover several years at once. Our page on GST/HST audits and disputes explains how those reviews unfold and how an assessment can be challenged. Where a business discovers a past failure before CRA does, a correction made proactively — in some cases through the voluntary disclosures program — can reduce penalties and interest compared with waiting for an audit; our overview of the voluntary disclosure process explains the eligibility conditions and trade-offs.

Why GST/HST compliance deserves early attention

Two features make GST/HST problems compound quietly. The first is the rolling small-supplier test, which can pull a growing business into the registration net mid-year, creating a liability the business does not realize it has incurred. The second is that the obligation to remit is independent of what the business actually collected: charging too little, or nothing at all, does not reduce the amount owed to the Crown. A modest monthly shortfall can grow, with penalties and daily compounding interest, into a substantial assessment by the time an audit arrives.

The good news is that almost every GST/HST exposure is more manageable when it is addressed early — before an audit, before the numbers grow, and before a director's personal liability for unremitted net tax under the Excise Tax Act comes into play. Choosing the right registration approach, the right accounting method, and the right reporting period at the outset prevents most of these problems from ever forming.

How Barrett Tax Law approaches this

Barrett Tax Law advises businesses across Canada on GST/HST registration and compliance, from new ventures deciding whether and when to register to established businesses untangling years of accumulated exposure. We begin by establishing the basics that drive everything else: when the business crossed the small-supplier threshold, what it should have been charging under the place-of-supply rules, which reporting period and accounting method fit its circumstances, and where its current practices diverge from what the Excise Tax Act requires.

Depending on the situation, that work may involve setting up registration correctly for a new or non-resident business, modelling the regular method against the Quick Method, correcting a late or missed registration, reconstructing input tax credit support, addressing a proactive correction through a voluntary disclosure, or responding to a GST/HST audit or assessment. Where directors face personal exposure for unremitted net tax, we coordinate the corporate and personal sides of the file together.

If you are unsure whether your business should be registered, how to choose between the regular method and the Quick Method, or how to deal with a GST/HST issue that has already arisen, you are welcome to contact us for a free, confidential consultation to discuss your circumstances and the options available to you.