Sales tax in Québec

Quebec runs its sales tax provincially with its own administration, its own registration and its own filing alongside the federal layer. It is the most distinct sales tax regime in the country, and the one where assuming another province's behaviour causes the most trouble.

Two taxes, two registrations, two returns — and a ledger that keeps them in separate payable accounts from the moment of sale.

Businesses outside Quebec that sell into it need to understand their own registration position, because obligations can arise from the customer's location rather than the seller's. This is exactly the kind of rule that catches growing e-commerce sellers by surprise.

The place-of-supply engine applies the destination treatment on the line; the registration question is one to confirm with a professional.

Tax is decided per line, not per invoice. Each line's treatment comes from the product's tax category and the place of supply, so a GST-only item and a GST-plus-provincial item sit on the same sale without anyone thinking about it. Combined rates split into their federal and provincial halves in the ledger — one payable account per tax actually levied — which is what lets a return be filed from the books rather than rebuilt in a spreadsheet.

The Tax report then reads that same ledger for any period: taxable sales by rate with the base for each, zero-rated sales counted rather than dropped, credit notes netted, and a self-check against the sales ledger that says so out loud when the two disagree. Input tax credits accrue from purchase documents as they are entered.