A Canadian business with a federal GST/HST number and a Shopify store believes it is compliant. In four provinces it may not be, the tests differ from each other in kind rather than degree, one of them can be triggered by a single transaction, and in three of them the tax it failed to charge is a cost it cannot recover from anyone.
Key Takeaway
Quebec, British Columbia, Saskatchewan and Manitoba operate sales taxes outside the federal system, and a GST/HST registration covers none of them. The registration triggers are structurally different: Saskatchewan imposes no minimum threshold and no requirement that the vendor be carrying on business in the province; British Columbia turns on $10,000 of direct sales in twelve months, or on nothing at all if you hold inventory there; Manitoba removed its small-seller exemption for out-of-province businesses effective December 1, 2021; Quebec applies a $30,000 threshold under its specified regime, with a separate general regime for goods. The deeper asymmetry is recovery: GST/HST and QST are value-added taxes with input recovery, while BC PST, Saskatchewan PST and Manitoba RST are single-stage retail taxes that a business generally cannot claim back, making them a permanent margin cost rather than a flow-through. From October 1, 2026 British Columbia extends PST to accounting, engineering, architectural, geoscience and security services.
The Structural Fact Everything Follows From
Most compliance failures in this area trace to one misconception, and it is worth dismantling before anything else.
Practitioner guidance states it plainly: most sellers assume their federal GST/HST registration handles sales tax everywhere, and it does not, because four provinces run their own sales tax outside the federal system and each needs its own registration. Ontario and the Atlantic provinces are the ones a federal number already covers, while British Columbia, Saskatchewan and Manitoba run their own tax and Quebec runs QST through Revenu Québec. None of it rides on the federal number[1].
So a Canadian seller faces not one sales tax system but up to five: the federal GST/HST regime, which harmonises with Ontario and the Atlantic provinces and applies GST alone in Alberta and the territories, plus four independent provincial regimes with their own statutes, administrators, registration triggers, tax bases, exemption structures and filing calendars.
This is not a matter of different rates on a common base. It is a matter of different legal tests producing different answers to the question of whether you are obliged to register at all, and this article's organising claim is that the differences are qualitative rather than quantitative. A business that understands Saskatchewan's rule has learned nothing that helps it in British Columbia.
The Recovery Asymmetry
The single most economically consequential distinction, and the one the operational sections later depend on.
The federal GST/HST is a value-added tax. A registrant charges tax on its outputs and claims input tax credits on the tax it paid on its inputs, remitting the difference. The tax is borne ultimately by the final consumer, and for a business in the chain it is a cash flow item rather than a cost. Quebec's QST operates on the same architecture, with input tax refunds performing the role input tax credits perform federally.
British Columbia PST, Saskatchewan PST and Manitoba RST are not value-added taxes. They are single-stage retail sales taxes, imposed on the final purchaser of taxable goods and certain services, with a narrower set of exemptions for goods acquired for resale. A business that pays PST on an input it consumes rather than resells generally cannot recover it. The tax is an expense.
The consequence for margin analysis is direct and is where the proposal's concern about unrecoverable input tax is best located. A firm operating across the harmonised provinces experiences indirect tax as a pass-through that affects timing. The same firm operating in BC, Saskatchewan or Manitoba absorbs a real cost on its consumed inputs, and that cost does not appear as a tax line in most management accounts because it is buried in the gross cost of whatever was purchased.
This is why the October 2026 British Columbia change discussed below matters more than its rate suggests. KPMG's characterisation is precise: businesses face new compliance obligations and additional unrecoverable provincial sales tax costs[2]. The word doing the work is unrecoverable.
The Threshold Matrix
The four registration tests, stated precisely, because the differences are the content.
British Columbia, PST at 7%. Threshold of $10,000, or no threshold if you store stock in the province. Whether you register depends on where your business is and whether you store goods in BC; a Canadian business located outside BC registers once its direct BC sales pass $10,000 in a twelve-month period[1]. A payments provider's compliance documentation records the same $10,000 CAD threshold over twelve months, applying to business-to-consumer sales of digital products, services, and goods shipped from a Canadian warehouse[3].
Saskatchewan, PST. No minimum at all[1], recorded elsewhere as a threshold of one transaction[3].
Manitoba, RST. Manitoba removes its small-seller exemption for out-of-province businesses[1].
Quebec, QST. A $30,000 CAD threshold over twelve months for business-to-consumer sales of digital products, services and certain goods under the specified regime[3], with physical goods entering QST once direct Quebec sales pass $30,000 for a business already GST-registered and carrying on business in Canada[1].
Read those four together. One province uses a dollar threshold with an inventory override. One uses no threshold and no nexus test. One disapplies its small-seller relief specifically for outsiders. One uses a higher dollar threshold split across two regimes. There is no common structure to learn, which is precisely the compliance problem, and the summary conclusion in the practitioner guidance is stark: Saskatchewan has no minimum at all, Manitoba removes its small-seller exemption for out-of-province businesses, and one direct sale can trigger a duty to register[1].
Saskatchewan: No Threshold, No Nexus Test
The most aggressive rule in Canada, and the one most likely to catch a business unaware.
Saskatchewan's legislation was amended effective January 1, 2020 to require operators of Electronic Distribution Platforms, Online Accommodation Platforms and Marketplace Facilitators to register as vendors for purposes of collecting and remitting the applicable PST on sales generated through their platforms, and under this regime there is no minimum sales threshold and no requirement that the vendor be carrying on business within Saskatchewan[4].
The second half of that sentence is jurisprudentially significant. The traditional basis on which a province could require a business to collect its tax was some form of presence, and the phrase "carrying on business" carried that concept. Saskatchewan's regime dispenses with it, resting instead on the destination of the supply.
The province's administrative framing is correspondingly broad. Saskatchewan's own guidance states that all businesses operating in Saskatchewan are required to be licenced or registered with the Ministry of Finance for PST purposes, and distinguishes a vendor's licence, issued to businesses making retail sales and permitting exempt purchase of goods for resale, from a registered consumer number, issued to businesses operating in Saskatchewan that do not generally make retail sales but purchase taxable goods and services for business use[5].
That second category deserves attention from businesses that assume registration is only about collecting. A registered consumer number exists to capture tax on inputs a business consumes, and the guidance is explicit that this number cannot be used to purchase goods or services without paying the PST[5]. Saskatchewan is not merely asking out-of-province sellers to collect; it is capturing consumption by businesses operating in the province.
For a Canadian seller the practical rule is simple and uncomfortable: there is no volume of Saskatchewan sales small enough to be safely ignored on threshold grounds, because there is no threshold.
British Columbia: Two Independent Triggers
The province where businesses most often misread their own position, because there are two tests and only one is a number.
The dollar test is $10,000 of direct BC sales in a twelve-month period for a Canadian business located outside BC[1]. The second test is not a threshold at all: there is no threshold if you store stock in the province[1].
The inventory trigger is where third-party logistics arrangements create exposure invisible to the finance function. A business using a fulfilment provider, a distributed warehousing service or a marketplace's logistics network may have inventory allocated to a British Columbia facility by an algorithm optimising delivery times, without anyone at the company making a decision to hold stock in BC. The practitioner guidance is direct that a business needs its own registration for inventory it holds in a Canadian warehouse[1].
The instruction that follows is specific: a business using third-party fulfilment should obtain, in writing and periodically, a list of the facilities in which its inventory has actually been stored. That is a question for the logistics provider, and it is a tax question that most companies never ask their logistics provider.
Note also what the $10,000 test measures. It is direct sales into the province, which as the marketplace section below explains, is not the same as total sales into the province.
Manitoba: The Exemption That Does Not Apply To You
A rule whose structure is worth understanding because it is a different mechanism from a threshold.
Prior to December 1, 2021, under Manitoba's traditional registration rules, a non-resident vendor was required to register for Manitoba RST if it held inventory in Manitoba or if certain delivery conditions were met, including that the vendor caused the property to be delivered in Manitoba; effective December 1, 2021 the RST legislation was amended to require non-residents to register on a broader basis[4]. The practitioner summary is that Manitoba removes its small-seller exemption for out-of-province businesses[1].
The distinction between removing an exemption and setting a threshold at zero is worth drawing. A threshold is a feature of the charging provision applying to everyone. An exemption disapplied by reference to the vendor's location is a rule that treats residents and non-residents differently on its face.
We flag, without resolving, that rules distinguishing between in-province and out-of-province vendors sit adjacent to Canada's constitutional constraints on provincial taxation and on interprovincial trade, and to the internal trade reform this publication has examined elsewhere. Whether any particular provision raises a genuine issue is a constitutional law question this article is not equipped to answer, and we note only that the design is asymmetric on its face.
Quebec: Two Regimes, Not One
The jurisdiction whose complexity is most often understated, because the $30,000 figure conceals a bifurcation.
The compliance documentation distinguishes two paths. Digital products or services sold to individuals in Quebec require the specified QST regime registration. Goods sold to individuals in Quebec that ship from a warehouse in Quebec, or from outside Quebec by means other than mail or courier, require the general QST regime registration[3].
Those are different registrations with different consequences, and the delivery method is a determinant. A business shipping goods into Quebec by courier is in a different position from one shipping by its own vehicle, which is an unusual axis of distinction and one that ordinary tax configuration in an e-commerce platform will not capture.
On the physical goods side for a Canadian business, the guidance notes that the moment you hold inventory in Canada you are GST-registered and carrying on business here, which brings physical goods into QST once direct Quebec sales pass $30,000[1].
QST's saving grace, relative to the three retail sales taxes, is that it is a value-added tax with input tax refunds. A Quebec-registered business recovers QST on its inputs in the way it recovers GST/HST federally. That makes QST registration administratively burdensome but not, in general, margin-destroying, which is the opposite of the position in BC, Saskatchewan and Manitoba.
The October 2026 Change Nobody Has Priced
The most immediately actionable item in this article, and it arrives in weeks rather than years.
KPMG reports that many businesses face new compliance obligations and additional unrecoverable PST costs relating to certain professional services in British Columbia effective October 1, 2026. British Columbia announced in its 2026 provincial budget that it will extend the application of BC PST to accounting services, architectural services, engineering and geoscience services, security services, and a wide range of non-residential real estate services. The province has released related PST proposals with various measures to be prescribed at a later date and several definitions referencing other legislation, and is expected to release further details in regulations and guidance[2].
Three features make this significant beyond its immediate scope.
It extends a retail sales tax to professional services purchased by businesses. Accounting, engineering and architectural services are overwhelmingly business inputs. A single-stage retail tax applied to business inputs produces exactly the cascading that value-added taxes were designed to eliminate, because the tax embeds in the cost of the service, which embeds in the price of whatever the purchasing business produces, which may be taxed again. This is the theoretical objection to taxing intermediate goods, and it is why the unrecoverability point matters so much here.
It reaches beyond the province. KPMG notes the proposals address resident and non-resident purchasers, and services provided in or outside the province, and that businesses with operations in multiple jurisdictions including British Columbia may have to carefully determine how the new measures apply to their facts[2]. An accounting or engineering firm outside BC serving BC clients cannot assume the change is someone else's problem.
A rule of 30% of the purchase price appears among the mechanics[2], which we flag as a threshold or apportionment concept whose operation we have not established and which readers should examine in the source material.
We should disclose the obvious: this publication is produced by an accounting firm, and accounting services are named in the extension. We have no view to offer on whether the policy is sound. We report it because a firm in our own sector that has not looked at this has roughly five weeks, and because businesses that purchase these services should expect their costs to change.
The Marketplace Carve-Out
The provision that reduces obligations for many sellers and creates a trap for the rest.
Where a remote business sells digital services or goods into Canada exclusively through online marketplaces that collect tax on those sales, it does not need to register for BC PST, and those sales do not count toward the registration threshold; the same treatment applies for QST[3]. The practitioner guidance concurs: on a marketplace like Amazon the platform collects for you, but you need your own registration for sales through your own store, website or wholesale orders, and for inventory you hold in a Canadian warehouse[1].
The operative word is exclusively. A seller operating only through marketplaces may be outside these registrations entirely. A seller operating through marketplaces and its own website is not, and critically, the threshold test applies to its direct sales only.
That produces a counterintuitive result worth stating plainly. Two businesses with identical total British Columbia revenue can be in opposite positions: the one selling entirely through Amazon has no registration obligation and no threshold accumulation, while the one selling the same volume through its own Shopify store crossed $10,000 long ago. The obligation follows the channel, not the customer.
The trap is the transition. A business that has grown on marketplaces and launches direct e-commerce begins accumulating toward thresholds it previously never approached, at a moment when its attention is on the new channel's marketing and fulfilment rather than on indirect tax registration.
Oates And The Decentralization Theorem
The theoretical frame that explains why this system exists and what it is supposed to buy.
Wallace Oates's work on fiscal federalism, principally his 1972 treatment, supplies the standard economic argument for assigning fiscal functions to subnational governments. We cite it as a canonical work from our own knowledge of the literature rather than from a source retrieved for this article.
The decentralization theorem holds that, in the absence of cost savings from centralised provision and of interjurisdictional spillovers, provision of a public good to a local population will be at least as efficient when delivered by local government as by a central one, because local government can match provision to local preferences while a central government providing a uniform level cannot. Where preferences differ across regions, uniformity imposes a welfare loss that decentralisation avoids.
Applied to sales taxation, the argument runs that provinces differ in their preferences over the size of government, the mix between income and consumption taxation, and the treatment of particular goods, and that provincial autonomy over a consumption tax base allows those differences to be expressed. Alberta's choice to levy no provincial sales tax is precisely the expression of preference that the theorem predicts and endorses.
That is a serious argument and this article does not dispute it. Canada's asymmetric sales tax landscape is not an accident or a failure of coordination; it is the visible output of a federation in which provinces hold genuine fiscal authority. The question the next section raises is what the theorem does not account for.
The Fixed Cost Problem
Our own extension of the framework, offered as analysis rather than as a result in the literature.
The decentralization theorem is a statement about allocative efficiency in the provision of public goods. It compares the welfare gain from matching provision to local preferences against the loss from foregone economies of scale and uncompensated spillovers. What it does not price, at least in its standard form, is the administrative and compliance cost imposed on private parties who transact across jurisdictional boundaries.
That cost has a specific structure, and the structure is the point. Registering in a province, learning its base and exemptions, configuring systems to apply the right rate to the right supply, and filing returns on its calendar is substantially a fixed cost. It scales with the number of jurisdictions a business sells into, and it barely scales with revenue at all. The compliance cost of Saskatchewan registration is very similar for a business with $8,000 of Saskatchewan sales and one with $8 million.
A fixed cost per jurisdiction is regressive in incidence. As a share of revenue it falls most heavily on the smallest multi-jurisdictional sellers, which in Canada means small businesses attempting to serve a national market. A large national firm amortises the same compliance apparatus across a revenue base thousands of times larger.
Two consequences follow that we regard as genuinely important. The system creates a scale advantage unrelated to productivity, efficiency or customer value, which is a competitive distortion the theorem does not contemplate. And it creates a rational incentive for small sellers to decline out-of-province sales, or to serve them through marketplaces that absorb the compliance function in exchange for a share of margin, which is a channel distortion.
Saskatchewan's design sharpens this to a point. With no threshold, the fixed compliance cost attaches to the first dollar of sales. For a small seller, the expected value of a modest volume of Saskatchewan business can be negative once compliance is priced, which is a coherent reason to refuse it.
A Tax Union Without A Tax Market
Connecting this to Canada's internal trade agenda, which is our own framing.
Canada has spent recent years addressing internal trade barriers through mutual recognition, an approach this publication has examined in the context of the Canadian Mutual Recognition Agreement and the federal internal trade legislation. The animating principle is that a good or service lawfully supplied in one province should be capable of being supplied in another without duplicative regulatory compliance.
Sales tax registration sits outside that project almost entirely, and it is worth asking why. The answer is that mutual recognition works for regulatory standards, where one province can accept another's determination that a product is safe or a professional is qualified, because the underlying purpose is shared. It does not work for taxation, because the purpose of a provincial sales tax is to raise revenue for that province, and no province can accept another's collection as a substitute.
But that does not exhaust the options, and the federal GST/HST harmonisation demonstrates the alternative. Ontario and the Atlantic provinces retain fiscal autonomy over their rate while outsourcing administration, base definition and collection to a single federal system. The provincial preference the decentralization theorem protects is the rate and the revenue, not the administrative apparatus, and harmonisation preserves the former while eliminating duplication of the latter.
The four non-harmonised jurisdictions have made a different choice, and each has reasons. Quebec administers its own system with genuine capability and a distinct legal tradition. Alberta levies no provincial sales tax at all. But the practical result for a Canadian business is that the compliance burden of the internal market falls hardest not on the regulatory dimensions the internal trade agenda addresses, but on the fiscal dimension it does not.
Ledger Architecture: The Blueprint
The operational core. A chart of accounts adequate for a single-province business fails structurally in a multi-jurisdictional one, and the failures are predictable.
Separate liability accounts per jurisdiction and per tax. Not a single "sales tax payable" account. GST/HST payable, QST payable, BC PST payable, Saskatchewan PST payable, Manitoba RST payable, each distinct. Filing calendars differ, remittance dates differ, and reconciling a commingled balance to five separate returns is where errors originate.
Segregate recoverable from unrecoverable tax at the point of entry. This is the entry that most Canadian ledgers get wrong. GST/HST and QST paid on inputs are receivables, sitting in an ITC or ITR recoverable account. BC PST, Saskatchewan PST and Manitoba RST paid on consumed inputs are generally not recoverable and belong in expense, capitalised into the cost of the item purchased. A business that posts all provincial tax to a recoverable account overstates assets and understates cost; one that expenses everything understates its ITC claim.
Tag revenue by ship-to jurisdiction, not by customer billing address. Place of supply for goods generally follows delivery. A customer headquartered in Toronto taking delivery in Regina is a Saskatchewan supply.
Tag revenue by channel. Because the marketplace carve-out means marketplace sales do not count toward thresholds, the ledger must distinguish direct from marketplace revenue by jurisdiction, or the threshold monitoring described below cannot be performed.
Maintain a registration register. A simple table of jurisdiction, registration number, effective date, filing frequency, and next due date, reviewed monthly. Most multi-jurisdictional filing failures are calendar failures rather than technical ones.
Record inventory locations as a tax attribute. Given BC's inventory trigger, the physical location of stock is tax-relevant data that usually lives only in a logistics system.
Routing Rules And Place Of Supply
The decision logic a system needs to apply, expressed as a sequence rather than a lookup table.
The first question is what is being supplied, because the answer differs for tangible goods, digital products, and services, and because provincial bases diverge most on services. British Columbia's October 2026 extension to professional services[2] is a live illustration: a service that is outside PST in September may be inside it in October, and no rate table update captures that.
The second question is where the supply occurs, which for goods generally follows delivery and for services and digital supplies follows rules that differ between the federal regime and each province. Quebec's distinction between goods shipped by mail or courier and goods shipped by other means[3] is an example of a determinant that no general place-of-supply intuition would predict.
The third question is the channel, because a marketplace sale into British Columbia and a direct sale into British Columbia produce different obligations and different threshold consequences[3].
The fourth question is registration status, since obligations to collect follow from registration and from the trigger having been met, and the trigger tests differ across the four provinces as set out above.
Two practical warnings about implementation. E-commerce platform tax configuration is not self-executing: a community support thread describes a merchant with PST, QST and GST/HST registration numbers correctly entered, where Saskatchewan and Manitoba orders were charging GST alone and no provincial tax, with no resolution recorded[6]. We report that as an illustration of a configuration failure rather than as evidence about any platform's general behaviour. The transferable point is that entering a registration number does not verify that tax is being charged, and someone should place a test order into each province and inspect the tax line.
And marketplace behaviour must be established per platform rather than assumed. Etsy's published guidance, for example, describes charging BC PST at checkout on physical items and digital downloads delivered to BC buyers from locations in Canada, Saskatchewan PST on physical items and certain digital downloads, and Manitoba RST on physical items and certain digital downloads, while stating it will not collect and remit certain taxes from Canadian buyers for sales of physical goods and directing sellers to adjust listing prices and remit with their own GST/HST or QST filing[7]. A seller on multiple marketplaces cannot assume uniform treatment.
The Self-Assessment Trap
The obligation that runs in the opposite direction, and which businesses discover on audit.
The provincial retail sales taxes generally impose an obligation on a purchaser to self-assess tax on taxable goods or services brought into the province for its own use where the vendor did not collect it. Saskatchewan's registered consumer number exists precisely for businesses operating in the province that do not generally make retail sales but purchase taxable goods and services for business use, and that number cannot be used to purchase without paying the PST[5].
The practical exposure is a business that buys equipment, software or services from an out-of-province supplier who does not charge provincial tax, and books the invoice at face value. If a self-assessment obligation applied, the liability accrued and nobody recorded it.
This is the mirror image of the collection failure and it is less visible, because there is no customer complaint and no failed transaction to reveal it. It surfaces on audit, with interest, and the sum can be material for a business that has made significant capital purchases from out-of-province suppliers.
The ledger consequence is that the architecture above needs a self-assessment review step: a periodic examination of purchases from out-of-province suppliers where no provincial tax was charged, testing whether the item was taxable in the province of use. Whether and how self-assessment applies varies by province and by the nature of the purchase, and this is a question for a provincial indirect tax specialist rather than for a general rule.
A Worked Case: Four Provinces, Four Answers
A Canadian manufacturer of specialty equipment, based in Ontario, selling through its own website and through one marketplace, using a third-party fulfilment provider. The illustration is constructed to demonstrate the tests rather than reported from a specific engagement.
Saskatchewan. Direct website sales in the year total roughly $6,000. There is no minimum threshold and no requirement to be carrying on business in the province, so the low volume provides no protection. The compliance cost of registering, configuring and filing is a substantial fraction of the gross margin on $6,000 of sales.
British Columbia. Direct sales are approximately $7,500, below the $10,000 test. But the fulfilment provider has held inventory at a Vancouver-area facility for part of the year, which engages the inventory trigger independently of the dollar threshold. Nobody at the company decided to hold stock in BC; a logistics algorithm did, and the finance team has never seen the facility list.
Manitoba. Direct sales are small. The small-seller exemption that would assist a Manitoba business does not apply to an out-of-province vendor.
Quebec. Direct sales exceed $30,000, and the goods ship by courier, which under the distinction described above is relevant to which regime applies. QST is recoverable on inputs, so the burden is administrative rather than a margin cost.
Four provinces, four different reasons for the answer, and only one of them a simple dollar threshold. Marketplace sales into all four are outside the threshold calculation, so the company's total provincial revenue substantially overstates its threshold accumulation, which cuts in its favour and which its reporting does not currently distinguish.
The transferable observation is that the binding trigger was the one the company had no visibility into. A business can monitor its own sales; it cannot monitor a logistics provider's warehouse allocation unless it asks.
What To Do
Establish where your inventory has physically been. Request a written facility list from every fulfilment provider, covering the trailing twelve months, and repeat it periodically. This is the trigger businesses cannot see.
Split direct from marketplace revenue by province. Threshold tests run on direct sales, so undifferentiated provincial revenue answers the wrong question in both directions.
Separate recoverable from unrecoverable tax in the chart of accounts. GST/HST and QST are receivables; BC PST, Saskatchewan PST and Manitoba RST on consumed inputs are generally costs.
Treat Saskatchewan as having no safe harbour. No threshold and no carrying-on-business requirement means volume is not a defence.
If you buy or sell accounting, engineering, architectural, geoscience, security or non-residential real estate services with a British Columbia connection, act now. The extension applies from October 1, 2026 and reaches non-resident purchasers and services provided outside the province.
Place a test order into each province and inspect the tax line. Entering registration numbers into a platform does not verify that tax is being charged.
Establish each marketplace's behaviour in writing, per platform. Treatment differs between platforms and between product types on the same platform.
Build a self-assessment review into your purchase cycle. Out-of-province purchases with no provincial tax charged are where the reverse exposure accumulates silently.
Price the compliance cost before accepting the sale. For a small seller, a modest volume in a no-threshold jurisdiction can be value-destroying once registration and filing are costed, and that is a legitimate commercial conclusion.
The Limits Of This Analysis
Several caveats matter, and this area is unusually unforgiving of generalisation. Thresholds, triggers and bases change and vary by supply type; the figures here are reported from professional and commercial compliance sources rather than from the provincial statutes themselves, and should be verified against the Provincial Sales Tax Act (BC), The Provincial Sales Tax Act (Saskatchewan), The Retail Sales Tax Act (Manitoba), the Act respecting the Québec sales tax, and current administrative guidance before being relied on. The British Columbia professional services measures effective October 1, 2026 were, at the time of the source reviewed, subject to measures to be prescribed later and further regulations and guidance, and the "rule of 30%" is reported without our having established its operation. We deliberately did not cite case law: a proposal for this article referenced a decision we could not verify as existing, and rather than reproduce an unverifiable citation we have built the analysis on statutory and administrative sources. Oates (1972) is cited as a canonical work from our own knowledge rather than from a retrieved source, and the fixed-cost regressivity argument and the internal market framing are our own analysis rather than findings in that literature. This article does not address the constitutional limits on provincial taxation, place of supply rules in technical detail, the treatment of exempt and zero-rated supplies, real property, imports, or the territorial regimes. Nothing here is tax advice; a business selling into multiple provinces should obtain advice from a Canadian indirect tax specialist.
Frequently Asked Questions
Does my GST/HST number cover the whole country?
What are the registration thresholds?
Can I recover provincial sales tax the way I recover GST?
What changes in British Columbia on October 1, 2026?
Do sales through Amazon or Etsy count toward my thresholds?
Is there an obligation running the other way?
References
- Jones & Cosman CPA. (2026, June). Provincial Sales Tax Registration and Filing (PST/RST/QST) for E-Commerce Sellers, on the four non-harmonised provinces, the BC $10,000 and inventory tests, Saskatchewan's absence of a minimum, Manitoba's removal of the small-seller exemption for out-of-province businesses, the Quebec $30,000 position and the marketplace distinction. jonescosman.com/provincial-sales-tax
- KPMG Canada. (2026, March 20). B.C. PST on Professional Services Starts October 1, TaxNewsFlash-Canada No. 2026-17, on the extension to accounting, architectural, engineering and geoscience, security and non-residential real estate services, additional unrecoverable PST costs, resident and non-resident purchasers, the rule of 30%, and pending regulations. assets.kpmg.com/.../ca-bc-pst-on-professional-services-starts-october-1.pdf
- Stripe. Collect Tax in Canada, on the BC $10,000 twelve-month threshold and included transactions, the Saskatchewan single-transaction threshold, the Quebec $30,000 threshold, the specified versus general QST regime distinction including the mail and courier delivery test, and the marketplace exclusion from threshold monitoring. Note: compliance documentation published by a payments provider. docs.stripe.com/tax/supported-countries/canada/collect-tax
- DMA. (2026, March). Canada Sales Tax: Non-Resident Businesses May Need to Register, on the July 2021 federal changes, Saskatchewan's January 1, 2020 platform and marketplace facilitator amendments with no minimum threshold and no carrying-on-business requirement, and Manitoba's pre- and post-December 1, 2021 rules. Note: published by a tax services provider. dmainc.com/news-and-insights/canada-sales-tax-fall-2024
- Government of Saskatchewan. Provincial Sales Tax and PST On-Line Registry, on the requirement for businesses operating in Saskatchewan to be licenced or registered, and the distinction between a vendor's licence and a registered consumer number. sets.saskatchewan.ca/rptp/portal/footer/pst-registry
- Shopify Community. Setting Up Shopify Tax in Canada, describing a configuration in which Saskatchewan and Manitoba orders charged GST alone despite registration numbers being entered, with no resolution recorded. Note: a user support thread, cited as an illustration of configuration risk rather than as evidence of general platform behaviour. community.shopify.com/t/setting-up-shopify-tax-in-canada-isnt-straight-forward-and-need-help/175774
- Etsy. What Does Etsy Remit to Canadian Tax Authorities?, on its stated treatment of BC PST, Saskatchewan PST, Manitoba RST and QST at checkout and the circumstances in which it does not collect. help.etsy.com/hc/en-us/articles/6633345416215
- Oates, W. E. (1972). Fiscal Federalism. Harcourt Brace Jovanovich. Cited as a canonical work in the public finance literature from our own knowledge rather than from a source retrieved for this article.
This article discusses provincial sales tax registration and administration and is provided for general informational purposes. It is not tax advice. Thresholds and bases change and vary by supply type; verify against the relevant provincial statutes and current administrative guidance. The British Columbia measures effective October 1, 2026 remain subject to further regulations and guidance. Obtain advice from a Canadian indirect tax specialist.