What Is GST/HST? How Canada's Sales Tax System Works

This guide is the concept, not the rate card. It explains the machinery: what the tax is imposed on, who is legally required to collect it, how the credit mechanism keeps it from compounding through a supply chain, which province's rate applies to a given sale, and what a household actually gets back. If all you need is the number to put on an invoice today, the Canadian GST/HST calculator and the province-by-province rate pages will get you there faster.

Two audiences are served here, and the rules differ for each. If you are a consumer, the parts that matter are what is taxed, what is not, and the quarterly benefit that offsets it. If you run a business, the parts that matter are registration, input tax credits, place of supply and filing. Every section below names which of the two it addresses.

What GST/HST is, in one statute

Section 165 of the Excise Tax Act does the whole job in two subsections. The first says that every recipient of a taxable supply made in Canada pays tax calculated at the rate of 5%. The second says that where the supply is made in a participating province, the recipient pays that 5% plus a further amount at the tax rate for that province¹. There is no separate HST statute. HST is simply GST with subsection 165(2) switched on.

The base is the consideration for the supply — what the buyer actually agrees to pay, before the tax itself. That matters more than it sounds, because it means discounts, trade-ins and shipping charges are questions about what the consideration is, not questions about the tax rate. Get the consideration right and the rate does the rest.

That single design decision explains almost everything that follows. Because the provincial component rides on the federal one, it uses the same definitions, the same registration, the same return and the same credit mechanism. A business in Halifax and a business in Calgary file the same form; only the rate on the sales line differs.

Rates and structures as of August 2026, from the Canada Revenue Agency rate table² and the Department of Finance⁷.

Why it is a value-added tax, not a retail tax

The label "sales tax" is misleading. An American state sales tax is charged once, at the last sale in the chain, and everyone upstream buys tax-free using a resale certificate. GST/HST is charged at every sale in the chain, including the ones between businesses. What keeps it from stacking is that each registered business reclaims the tax it paid on its own purchases. The economics land in the same place as a retail tax; the plumbing does not.

The practical consequence for a business owner is a cash-flow one. The tax you charge is not revenue. It is money you are holding on behalf of the Receiver General, and it will leave your bank account on a fixed date. Businesses that treat collected tax as working capital are the ones that end up negotiating payment arrangements with the CRA.

Who collects, who pays, who is out of pocket

The three layers: federal GST, harmonised HST, and separate PST or QST

Canada does not have one sales tax system. It has one federal tax and three different provincial answers to it, which is why a national retailer needs a rate lookup rather than a memorised number. The federal 5% is the constant. What sits on top of it — a merged provincial share, a separate provincial tax, or nothing at all — is what changes at the border.

In the five participating provinces the provincial share is merged into the federal tax and administered by the Canada Revenue Agency on the province's behalf⁶. Ontario, New Brunswick, Newfoundland and Labrador, Nova Scotia and Prince Edward Island are the current members. One rate, one return, one auditor.

British Columbia, Saskatchewan and Manitoba kept their own retail sales taxes, which sit beside the GST rather than inside it. British Columbia's PST applies at 7% when taxable goods, software or services are acquired in the province or brought into it for use there⁵ — a completely separate statute, a separate registration and a separate return. Quebec runs the same pattern with the QST, but with two differences that matter: the QST is 9.975% and applies to the selling price excluding the GST, and Revenu Québec administers the federal GST/HST inside Quebec on the CRA's behalf⁴.

Alberta, Yukon, the Northwest Territories and Nunavut levy no general sales tax of their own, so the 5% federal GST is the whole bill².

Structures as of August 2026. Rates per the CRA rate table²; provincial administration per British Columbia⁵ and Revenu Québec⁴.

A short history: from a hidden manufacturers' tax to 5% at the till

The GST was not a new tax so much as a replacement for an old and much-disliked one. Until 1991 Canada ran a Federal Sales Tax that had been in effect since 1924 and applied at a general rate of 13.5% on goods manufactured in Canada⁷. Because it hit manufacturers rather than retailers, consumers never saw it, exporters carried it in their cost base, and imported goods were treated more kindly than domestic ones.

In 1991 the government adopted the Goods and Services Tax, originally at a flat 7%, and introduced the GST Credit in the same year to reduce the burden on low- and modest-income Canadians⁷. The politics were brutal and the arithmetic was sound: a broad-based tax at a visible rate, with a credit paid to the households it would otherwise hit hardest.

Harmonisation came next. New Brunswick harmonised its provincial sales tax with the GST effective 1 April 1997, creating a 15% HST composed of the 5% federal component and a 10% provincial component, administered by the CRA on behalf of all participating provinces⁶. Newfoundland and Labrador dates its own participation from 1 July 1997⁸ — the two provincial finance departments do not describe the start of the Atlantic harmonisation identically, so treat 1997 as the year and check the specific province if a transitional date matters to you.

Dates as published by the issuing authority; the CRA's own historical rate table begins at 1 April 2013².

The direction of travel is worth noticing. Since 1991 the federal rate has only ever gone down, from 7% to 5%. Provincial shares have moved in both directions, and Nova Scotia became the first participating province to cut its share when it dropped to 14% on 1 April 2025². Rate changes on this scale are rare enough that they arrive with transitional rules about which date governs a given invoice, and old rates hang around in contracts and deposits for months afterwards.

Who has to register, and the $30,000 small-supplier rule

You must register for GST/HST once your worldwide revenues from taxable supplies pass $30,000. That threshold is tested two ways, and the two tests have very different consequences, which is the single most common thing small businesses get wrong.

The single-quarter test

If you exceed $30,000 in one calendar quarter, you stop being a small supplier immediately. Your registration is effective no later than the day of the supply that made you exceed the threshold⁹. That means the invoice that pushed you over should itself carry tax — not the next one. If you issued it without tax, you still owe the tax, and you will either absorb it or go back to the customer.

The four-quarter test

If you exceed $30,000 across four consecutive calendar quarters without exceeding it in any single one, your registration takes effect no later than the day of your first supply after you stopped being a small supplier, and you must register by the end of the following month⁹. Either way, the CRA expects you to register within 29 days of your effective date⁹.

Nothing here is dramatic quarter by quarter. The threshold is breached by the rolling total, which is exactly why it gets missed: no individual invoice looks like the one that changed your status. Keep a rolling four-quarter figure, not a calendar-year one.

The exceptions that override the threshold

• Taxi and ride-share drivers must register on the day they begin operating, small supplier or not⁹.
• Charities and public institutions get a gross revenue test of $250,000 alongside a $50,000 taxable supplies test, applied with the same single-quarter and four-quarter logic⁹.
• Other public service bodies use a $50,000 threshold rather than $30,000⁹.
• Non-residents are generally required to post security of 50% of estimated net tax, subject to a $5,000 minimum and a $1 million maximum, unless annual taxable sales in Canada are $100,000 or less⁹.

The input tax credit chain: why a 13% tax collects exactly 13%

This is the mechanism that makes GST/HST a value-added tax rather than a cascading one, and it is worth walking through with numbers because the result is genuinely counter-intuitive. Tax is charged on every sale in a supply chain, including business to business. Yet the total the government receives equals the tax on the final retail sale and not a cent more, because every registrant in the middle reclaims what it paid.

Take a table sold in Ontario at 13% HST, from forest to living room. Each business charges tax on what it sells, claims an input tax credit for the tax on what it bought, and remits the difference on line 106 of its return¹⁰.

Each business remits tax on the value it added, and the shares fall out of the arithmetic rather than out of policy. The retailer added the most value on this table, so it remits the largest slice.

Share of the $312.00 total remitted at each stage, derived from the ledger above at Ontario's 13% rate².

What the same chain would cost without the credit

The value of the credit mechanism is easiest to see by removing it. Suppose the same four businesses had to charge 13% on every sale and hand over all of it, with nothing reclaimable — a turnover tax rather than a value-added tax. The government would receive $52.00, $130.00, $208.00 and $312.00, for a total of $702.00 on a table that reached the customer at $2,400.00. That is 125% more tax on identical commerce, collected at an effective rate of 29.25% rather than 13%.

And $702.00 understates it, because in a real cascading system each business marks up a cost that already contains tax, so the tax compounds through the chain. That compounding is the reason turnover taxes push firms to merge — a business that owns its own sawmill eliminates a taxable sale and pays less tax on the same output. A value-added tax is neutral on that question: however many companies the table passes through, the total is $312.00. The tax stops influencing how supply chains are organised, which was the main argument for adopting it in the first place.

The five conditions a claim has to satisfy

The CRA sets out five requirements for claiming an input tax credit: the property or service was acquired for consumption, use or supply in your commercial activities; you were a registrant during the reporting period in which the tax was paid or became payable; the tax was in fact paid or payable; you hold sufficient documentary evidence before you claim; and you claim within the time limit¹⁰. Four of the five are about paperwork and timing rather than about the purchase itself.

Documentation scales with the amount

The evidence the CRA expects gets heavier in three steps. This is the part of the rules most often quoted out of date, so it is worth reading the current tiers carefully.

Documentary requirements per the Canada Revenue Agency, current as of August 2026¹⁰.

Time limits and blocked claims

Most registrants have four years to claim: the deadline is the due date of the return for the last reporting period ending within four years after the end of the period in which the credit first became available. A two-year limit applies to listed financial institutions and to businesses whose threshold amounts exceed $6 million in both the current and preceding fiscal years where less than 90% of supplies in the preceding two years were taxable¹⁰.

Some tax simply never comes back. You cannot claim credits on purchases used to make exempt supplies, on property or services acquired for personal consumption, or on membership dues to clubs whose main purpose is recreation, dining or sporting facilities — fitness clubs, golf clubs and hunting and fishing clubs are named explicitly, unless you bought the memberships to resell. Meals and entertainment are claimable only to the allowable extent¹⁰.

If you want to see the recoverable and non-recoverable portions of a specific purchase split out, the input tax credit calculator does the arithmetic province by province, and the input tax credits guide works through the restrictions in detail.

Taxable, zero-rated and exempt: the distinction that decides your cash position

Everything you sell falls into one of three buckets, and the difference between the second and the third is worth real money. Taxable supplies carry tax at the applicable rate. Zero-rated supplies are taxable at 0%. Exempt supplies are outside the tax altogether¹².

On a customer receipt, zero-rated and exempt look identical: no tax. On the seller's return they are opposites. Zero-rated sales are still commercial activity, so the seller claims full input tax credits on the costs behind them. Exempt sales are not commercial activity, so the tax on those costs is a permanent expense.

Categories and examples per the Canada Revenue Agency, as of August 2026¹².

Neither business charges its customers a cent of tax. One gets $1,300 back from the CRA and one does not. If you sell into an exempt sector, the tax on your inputs is part of your cost base and belongs in your pricing, not in a receivable.

Which rate applies: the place-of-supply rules

The rate is set by where the supply is made, not by where you are. This trips up nearly every business that sells across a provincial boundary for the first time, and it is settled by a short set of rules rather than by intuition.

Goods

For a sale of goods, the place of supply is the province in which the goods are delivered, or the destination province if they are shipped, mailed or couriered¹³. The CRA's own example makes the point sharply: a store in Alberta selling to an Ontario purchaser and shipping to Ontario charges Ontario HST, even though legal delivery happens in Alberta, because the place of supply is Ontario¹³.

This example is the CRA's³, and the $20 is the least interesting part of it. A business buyer in the Halifax case recovers all $140 through an input tax credit. A business buyer picking up in Manitoba recovers the $50 federal portion and absorbs the $70 provincial one. The delivered option is $20 more expensive at the till and $50 cheaper after credits.

Services, real property and intangibles

For services the general rule is the recipient's address, where the supplier obtains that address in the normal course of business, using the home or business address most closely connected with the supply. Where no such address is obtained, the rules fall back to where the service is performed, and where a service is performed equally across several participating provinces, the province with the highest HST rate governs¹³.

Real property is simpler: the place of supply for a sale is the province where the property is located, and for a lease it is the province where the property is located during the lease interval¹³. Intangible personal property follows where the Canadian rights can be used, with tie-breakers based on a $300 consideration threshold, the recipient's address, and — again — the highest HST rate¹³.

Bringing goods into a participating province

The rules also run in the other direction. Consumers and non-registrants can owe the provincial part of the HST on goods or services brought into a participating province, or moved from a lower-rate province to a higher-rate one, subject to a minimum monthly tax threshold of $25 and to exceptions for transportation, telecommunication and legal services¹³. Registrants using the property at least 90% in commercial activities generally do not self-assess¹³.

What this means operationally for a seller

A business shipping across the country is charging up to four different rates on the same product in the same week, and the choice is made by the shipping address rather than by anything on the order. Two consequences follow. First, the tax rate has to come out of your order data, not out of a setting, which is why storefront and invoicing systems ask for a delivery province before they will calculate anything. Second, your return has to be able to show which sales carried which rate, because the CRA reconciles the tax you reported against the sales you reported.

There is one simplification worth knowing about: none of this changes your registration. You hold a single GST/HST account and file a single return no matter how many provinces you sell into, because the CRA administers the harmonised tax on behalf of every participating province⁶. Only the rate varies, and only where a participating province is involved. Compare that with the American position, where crossing a state line can mean a new registration, a new return and a new due date.

If you need to resolve a rate from a postal code rather than a province name, the rate lookup by forward sortation area covers every FSA in the country, and the Ontario province page is a worked example of what a single jurisdiction's rules look like end to end.

How to calculate GST/HST on a sale — and show it on the invoice

The arithmetic is trivial once the two hard questions are answered: do you charge, and at what rate. These five steps put them in order.

1. Confirm you have to charge the tax at all. Check that you are a GST/HST registrant and that what you are selling is a taxable supply rather than an exempt one. Registrants charge on taxable and zero-rated supplies; nobody charges on exempt supplies.
2. Work out the place of supply. For goods, the place of supply is the province the goods are delivered or shipped to. For services, it is normally the province of the recipient address you obtain in the ordinary course of business.
3. Look up the rate for that province. Apply the 5% GST in non-participating provinces, or the harmonised rate in a participating province. Confirm the current figure against the CRA rate table rather than relying on memory, because provinces do change their share.
4. Apply the rate to the consideration. Multiply the pre-tax selling price by the rate and round to the cent. In Quebec, calculate the 5% GST and the 9.975% QST separately, because the QST applies to the selling price excluding the GST.
5. Show it on the invoice and record it for the return. State the rate and the tax amount, or say clearly that the price includes GST/HST. Record the tax collected so it can be netted against your input tax credits when the return is due.

Quebec is the only one that needs two calculations. The GST is 5% of the selling price and the QST is 9.975% of the selling price excluding the GST⁴, which gives a combined burden of 14.975% — higher than Ontario's 13%, lower than the 15% band, and not a number you can guess. The calculateur TPS et TVQ handles the two-step version in French, and the Ontario calculator handles the single-rate case.

Working the tax backwards out of a total

Reverse calculation comes up constantly: a receipt shows only a total, or a contract is quoted tax-included. The move is to multiply the total by the tax fraction rather than to subtract a percentage, which is the classic error.

The fractions follow directly from the rates: 5/105 for GST alone, 13/113 in Ontario, 14/114 in Nova Scotia and 15/115 in New Brunswick, Newfoundland and Labrador and Prince Edward Island². Quebec needs the combined 14.975% divisor because of the separate bases. The reverse GST/HST calculator applies the right fraction automatically, and the Quebec version splits GST from QST. The same technique in a VAT context is covered in how to work out VAT backwards and calculating tax from a total.

What the invoice has to say

The CRA requires you to tell customers whether GST/HST applies and whether it is included in the price or added separately, using receipts, invoices, contracts or posted signs. You must show the applicable rate and either the tax as a separate line or a clear statement that the total includes GST/HST. For HST you show the total rate, not the federal and provincial split³.

When your customer is itself a registrant, your invoice is the evidence behind its input tax credit, so the documentation tiers above are effectively an invoicing standard as well as a record-keeping one. A missing registration number on a $600 invoice is your customer's problem and, eventually, your reputation. GST/HST on Canadian invoices has the full field list and sample layouts.

Filing and remitting: periods, deadlines and net tax

What you send the CRA is net tax: the GST/HST you charged, less the input tax credits you are entitled to¹¹. When credits exceed tax charged — a normal outcome for exporters, for zero-rated sellers and for anyone in a heavy investment year — the return produces a refund rather than a payment.

Your reporting period is assigned by revenue, and you can usually elect to file more often than required but not less.

Assigned and optional reporting periods per the Canada Revenue Agency, as of August 2026¹¹.

Monthly and quarterly filers file and pay one month after the end of the reporting period. Annual filers file and make their final payment three months after their fiscal year end¹⁴. There is a well-known wrinkle for sole proprietors: an individual whose business has a 31 December fiscal year end and who had business income for tax purposes for that year has a payment deadline of 30 April and a filing deadline of 15 June¹⁴. The dates are deliberately different, and paying on the filing deadline is late.

Annual filers may also have to pay in instalments through the year rather than in one amount at the end¹⁴. If cash timing is the issue you are trying to solve, moving to quarterly filing voluntarily is usually a cleaner fix than instalments, because it keeps the money and the return on the same rhythm.

What GST/HST means if you are just a consumer

Most Canadians never register for anything and still interact with this tax every day. The consumer side comes down to four things: what escapes the tax, what comes back as a benefit, what comes back as a rebate, and what does not come back at all.

What is not taxed

The zero-rating of basic groceries is by far the largest piece of consumer relief in the system. Milk, bread and vegetables carry no tax, while soft drinks, candies and potato chips do¹². Prescription drugs and dispensing services are zero-rated, as are certain medical devices and feminine hygiene products¹². Long-term residential rent, most health and dental care, child care and most educational services are exempt rather than zero-rated — the difference does not show up on your receipt, but it shows up in your landlord's cost base¹².

The line between the two categories is drawn around necessity rather than around price, and it produces results that look arbitrary at the till. A loaf of bread is zero-rated; a bag of potato chips is taxable. A prescription is zero-rated; a hotel room is taxable at the full provincial rate. The boundary between prepared and unprepared food is where most disputes live, which is why restaurant operators, caterers and grocery retailers with hot counters end up needing rulings that a supermarket never does.

The quarterly benefit that offsets the tax

The GST Credit was introduced alongside the GST in 1991 precisely because a broad consumption tax weighs more heavily on low incomes⁷. It ran for 35 years as a tax-free quarterly payment for individuals and families with low and modest incomes, recalculated every July from the previous year's return¹⁵.

As of July 2026 it has been renamed the Canada Groceries and Essentials Benefit¹⁵, with a 25% increase to the benefit amount that is set to hold for five years, from 2026 to 2031¹⁶. The final payment issued under the old GST/HST credit name went out on 2 April 2026, and eligibility did not change¹⁵. For the benefit year running from July 2026 to June 2027 the maximum amounts are $679 for a single individual, $890 for a married or common-law couple, and $234 for each eligible child under 19¹⁷. Where the total entitlement is small, quarterly amounts under $50 are consolidated into a single payment rather than spread across the year¹⁶.

Housing rebates

New housing is taxable, which would put a large one-off charge on the biggest purchase most households ever make, so the system rebates part of it. The GST/HST new housing rebate returns 36% of the federal part of the tax up to a maximum of $6,300, and no rebate is available where the fair market value reaches $450,000¹⁸. Ontario adds its own new housing rebate, capped at $24,000 where HST was paid on the land and $16,080 where it was not¹⁸.

There is also a first-time home buyers' rebate: full relief on homes valued at or under $1 million, reduced gradually between $1 million and $1.5 million, and none at $1.5 million or more¹⁸. Ontario's enhanced new housing rebate runs to as much as $80,000 on homes valued up to $1.85 million¹⁸. These are large enough numbers that they belong in a purchase budget rather than in a footnote.

Visitors get nothing back

Canada does not operate a tourist refund scheme. There is no general rebate for a visitor taking purchases home, and no airport counter that will refund the tax on a suitcase full of shopping. What the CRA administers in this space is narrow and business-facing: rebates for sponsors of foreign conventions and for non-resident exhibitors, not for individual travellers¹⁹. If you are comparing prices across the border in the other direction, border shopping and sales tax covers what happens on the American side.

Selling into Canada from outside it

A non-resident business can be required to register even with no office, staff or stock in the country. Canada's digital economy measures took effect on 1 July 2021 and cover three situations: cross-border digital products and services, qualifying goods supplied in Canada from fulfilment warehouses, and platform-based short-term accommodation²⁰.

The structural point is that the obligation follows the customer, not the seller's location. A streaming service in Stockholm with Canadian subscribers, a marketplace seller whose stock sits in a Mississauga warehouse, and a booking platform listing apartments in Montreal are all inside the net for different reasons. Quebec adds a second layer, because the QST is a separate provincial tax with its own registration administered by Revenu Québec⁴.

The detail — which registration stream applies, what a simplified registration does and does not allow, and how a Canadian business customer avoids being charged as a consumer — is in GST/HST for non-resident digital businesses. The taxability of the products themselves is covered in digital products and sales tax, and the platform's own duty to collect in marketplace facilitator laws. Accommodation platforms should also read short-term rental lodging tax, because municipal levies sit on top of the federal tax.

GST/HST next to US sales tax and European VAT

Canada sits between the two systems most readers will have met, and understanding the comparison prevents a specific class of mistake in each direction.

That display convention is the practical trap for visitors and for anyone pricing a Canadian product from abroad. A $50 shelf price in Toronto is $56.50 at the till; the same product priced at £50 in London is £50 at the till. The concept is unpacked in inc VAT vs ex VAT, and the structural comparison in sales tax vs VAT. If you want the headline rates for many countries side by side, the global tax rates dataset carries them with sources.

Common mistakes and edge cases

Almost every GST/HST problem worth having falls into one of these. They are ordered by how often they turn into an assessment rather than by how interesting they are.

• Charging your own province's rate. A Calgary retailer shipping to Ontario charges 13%, not 5%. The place of supply is the destination for goods¹³, and getting this backwards understates tax on every interprovincial sale you make.
• Treating exempt as zero-rated. Both show no tax on the invoice, and only one lets you claim input tax credits¹². Businesses in health care, child care, education and residential letting routinely claim credits they are not entitled to.
• Missing the single-quarter registration test. One unusually large quarter ends small-supplier status immediately, and the supply that broke the threshold should already carry tax⁹.
• Assuming PST works like HST. British Columbia, Saskatchewan and Manitoba tax a different base, with a different registration and no input tax credit mechanism⁵. Filing one return and assuming both taxes are covered is a common and expensive error; the PST comparison sets out both obligations.
• Claiming credits without the right documentation. At $100 you need the supplier's registration number; at $500 you need your own name, a description and the payment terms¹⁰. Auditors work through this tier list mechanically.
• Claiming blocked items. Club memberships for recreation, dining or sport, personal-use purchases, and inputs to exempt supplies are not recoverable¹⁰.
• Forgetting to self-assess. Moving goods from a non-participating province into a participating one can create a liability for the provincial part, above a $25 monthly threshold¹³.
• Missing the 29-day registration window. The clock runs from your effective date, not from the day you noticed⁹.
• Spending the tax you collected. Net tax is due on a fixed date whether or not the money is still there. The tax you charge is never revenue.
• Quoting an old rate. Nova Scotia moved to 14% on 1 April 2025 and much of the internet has not caught up². Rate changes bring transitional rules about which date governs deposits, subscriptions and long contracts.

One more that is less a mistake than a decision: businesses that mostly sell to other registrants often under-appreciate how cheap registration is. Your customers reclaim what you charge, so the tax is invisible to them, while your own credits are real money. The service-taxability question that decides whether you charge at all is a different one again, and whether services are taxable covers how that reasoning works in a system that starts from the opposite default.

Where to go next

• Canadian GST/HST calculator — add the tax to any price for any province or territory.
• Reverse GST/HST calculator — pull the tax back out of a total using the right tax fraction.
• Sales tax by province — the current rate, structure and filing rules for all 13 provinces and territories.
• Input tax credit calculator — see what you can actually recover on a purchase, and what you cannot.
• GST/HST compliance — registration, the Quick Method and the filing calendar in operational detail.
• Tax data sources — every authority behind the rates on this site, with links.