PST vs GST/HST: Why Some Provinces Charge You Twice

Three Different Structures

Canada looks like one sales tax system from the outside. It is really three arrangements running side by side, and which one applies depends entirely on the province.

For the system as a whole — how the federal GST sits under every province, what harmonisation changed, and how the input tax credit chain works — see what GST/HST is.

For current rates by province, use sales tax by province — provincial rates change on their own schedules, so a figure printed in an article ages badly. This guide is about the structure, which is stable.¹

PST Is a Second Obligation, Not a Line Item

The most common error made by businesses expanding into BC or Saskatchewan is assuming a GST/HST number covers them. It does not. PST is administered by the province, with its own registration, its own return, its own deadlines and its own audits.²

The Tax Bases Do Not Match

This is the part that costs money quietly. Federal and provincial systems were written separately and exempt different things, so taxability has to be checked twice.

Services are where the two diverge most. A service can be fully taxable federally and entirely outside the provincial base, or the reverse. The exempt-versus-zero-rated distinction on the federal side is covered in GST/HST compliance.

No Input Recovery on Most PST

GST/HST is a value-added tax: registrants recover the tax paid on business inputs through input tax credits, so it is not a cost. Most PST is not built that way. It is generally a single-stage tax on the end user, and PST paid on business purchases is usually unrecoverable.

The practical consequence is that PST is a genuine expense line rather than a flow-through, and it belongs in pricing rather than in a tax-recovery calculation. Quebec is the exception — QST behaves more like a VAT, with input tax refunds available to registrants.³

The Five-Step Method

1. Identify the tax structure of each province you sell into. Sort them into HST provinces, GST-plus-PST provinces, QST for Quebec, and GST-only for Alberta and the territories.
2. Register federally for GST/HST first. The federal registration is the foundation and applies across the country once you exceed the small supplier threshold.
3. Register separately in each PST province where required. A PST or RST registration is its own application with its own thresholds, and selling into the province can trigger it even without a physical presence.
4. Check the provincial tax base separately from the federal one. Confirm taxability under each system independently rather than assuming a federally taxable supply is provincially taxable too.
5. File each return on its own schedule. GST/HST and PST have separate returns and deadlines, and being current on one says nothing about the other.

The Distinction That Decides Your Cash Position

The difference between a value-added tax and a retail sales tax is not academic — it determines whether the tax you pay on business inputs comes back:

• GST and HST are value-added taxes. A registered business recovers what it pays on inputs through input tax credits, so the tax is borne by the final consumer and is a timing item for everyone in the chain.
• Quebec's QST is also a value-added tax, recovered through input tax refunds — the provincial counterpart to ITCs, filed with Revenu Québec rather than the CRA.
• BC's PST, Manitoba's RST and Saskatchewan's PST are retail sales taxes. They are charged once, at the final sale, and a business that pays them on inputs does not get them back. They are a cost, not a timing difference, and they belong in the expense account rather than a recoverable tax account.

That single distinction changes pricing, margin, and cash flow for any business operating across provincial lines — and it is why identical-looking 12% combined rates in British Columbia and Manitoba behave completely differently from a 13% HST in Ontario.

Two Registrations, or One

The tax model also decides how much administration you carry. In the HST provinces one CRA registration and one return cover everything. In BC, Manitoba and Saskatchewan you deal with the CRA for GST and the provincial authority for PST or RST — different thresholds, different portals, different calendars.

The thresholds are the trap for out-of-province sellers, because they are not the same number: the federal small-supplier threshold is $30,000, while BC and Manitoba set provincial thresholds at $10,000 and Saskatchewan requires registration from the first taxable sale. A seller comfortably below the federal threshold can already be required to register provincially.

Continue the chain

• GST/HST compliance — exempt versus zero-rated on the federal side.
• Input tax credits — recovering the federal tax you paid on inputs.
• GST/HST on invoices — showing both taxes correctly on a bill.
• Sales tax vs VAT — how Canada's system compares to the US model.