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Canada tax workflows: separate GST/HST, British Columbia PST and Quebec QST

An ERP can produce the correct total on a Canadian invoice while putting the tax into the wrong return account. The implementation therefore needs more than a province-to-rate lookup. It needs an approved registration decision, a supply classification, separate tax components and a reversal process that preserves the original transaction's treatment.

This guide follows one registered seller's ordinary taxable goods sold in Ontario, British Columbia and Quebec. It excludes special products, property, imports, marketplace obligations and sector exemptions. It also assumes that the seller's registrations and the place of supply have already been confirmed. Use the workflow to turn those decisions into controlled ERP data, rather than treating this example as a registration opinion.

Determine the supply before choosing a rate

The CRA explains that the GST/HST rate depends on both the type of supply and where it is made. Its current rate guidance distinguishes HST provinces from provinces with GST and a separate provincial tax. A billing address alone is not a complete rule for every supply. CRA rate and place-of-supply guidance

Record the legal seller, registration identifiers, customer, delivery evidence, product category and exemption evidence before calculating the invoice. For each category, the tax owner should define which fact determines the applicable place of supply and where the evidence is retained. Give exceptions a review queue instead of silently defaulting them to the warehouse province.

Maintain effective dates on rates and tax treatments. A corrected customer address should not retrospectively rewrite the tax on posted invoices without an approved correction process. Retain the original decision and the new evidence as separate versions, especially where the delivery or supply terms changed after an order was entered.

British Columbia generally applies 7% PST to taxable goods and services, subject to exceptions. Its current guidance also says the proposed expansion to specified professional services is paused. Do not activate a service tax code from an older announcement simply because it has a future effective date. British Columbia PST guidance, updated September 2026

Keep registrations and liabilities separate

Create distinct identities for GST/HST, British Columbia PST and Quebec QST registrations. Link each identity to its approved scope, filing account, filing period, credentials owner and evidence of registration. A federal registration should not automatically switch on every provincial tax code.

British Columbia's registration guidance distinguishes businesses and activities inside and outside the province and contains specific conditions and exceptions. Apply the relevant branch to the seller's facts rather than importing a universal Canadian registration threshold. Its page updated 1 October 2026 repeats the professional-services pause. British Columbia registration guidance

For Quebec, record whether the seller belongs under the general or specified QST system. Revenu Québec distinguishes these systems for suppliers outside Quebec; their conditions cannot be inferred from the presence of a QST amount on an invoice. QST registration for suppliers outside Quebec

In the general ledger, use separate control accounts or a reliably filtered equivalent for each tax return population. Keep tax charged on sales distinct from tax paid on purchases. In particular, do not configure PST as automatically recoverable merely because GST/HST purchase tax can qualify for a credit in an appropriate case. The purchase's legal treatment needs its own approved rule.

Worked example: three provinces and one credit

The following synthetic seller is already registered for GST/HST, British Columbia PST and the general QST system. All three supplies are ordinary taxable goods with approved provincial treatment. Prices are in Canadian dollars, tax exclusive. There are no discounts, exemptions, input taxes, foreign exchange or tax remittances during the example.

An Ontario sale has a net value of CAD1,000 and HST of CAD130, producing CAD1,130 receivable. A British Columbia sale has CAD1,000 net, GST CAD50 and PST CAD70, producing CAD1,120 receivable. A Quebec sale has CAD1,000 net, GST CAD50 and QST CAD99.75, producing CAD1,149.75 receivable.

For the Quebec calculation, GST at 5% and QST at 9.975% are each calculated on the selling price before GST. QST is not calculated on a GST-inclusive base in this example. Revenu Québec calculation guidance

The three invoices therefore contain CAD3,000 revenue. The GST/HST control balance is CAD230, the PST balance CAD70 and the QST balance CAD99.75. Total output tax is CAD399.75 and total receivables are CAD3,399.75. These amounts agree, but they must remain separable for their respective reporting workflows.

Next, an approved return reverses CAD200 of the British Columbia goods sale. The credit reduces GST by CAD10 and PST by CAD14. Its gross value is CAD224. Apply it to the original invoice and retain the original tax components and registration references.

After the credit, revenue is CAD2,800. GST/HST is CAD220, PST CAD56 and QST CAD99.75. Total output tax is CAD375.75 and receivables are CAD3,175.75. The equation is CAD2,800 plus CAD375.75 equals CAD3,175.75. The credit has changed neither the Ontario HST nor the Quebec QST population.

If the customers pay the remaining invoices in full, bank receipts should equal CAD3,175.75, absent fees or other adjustments. Clearing receivables does not by itself file any tax return or prove that the three tax liabilities have been remitted.

Diagnose a wrong Quebec base

Suppose the integration calculates QST on CAD1,050, including the CAD50 GST. At 9.975%, the rounded QST becomes CAD104.74 rather than CAD99.75. The invoice is overstated by CAD4.99. A reconciliation of total Canadian tax might hide this if another invoice contains an opposite error.

The tax owner should approve the corrected calculation, customer service should arrange the required customer document, and accounting should correct both receivable and the QST control account. The integration owner should fix the taxable-base rule and rerun the same input in a test environment. Simply posting CAD4.99 to a general rounding expense would leave the customer document and return population unexplained.

Also test the opposite error: importing a combined "12% BC tax" amount into the GST/HST account. The gross British Columbia invoice can still be CAD1,120 while the federal balance is overstated by CAD70 and the PST balance is missing. A component-level reconciliation is necessary even when every invoice total agrees with the source system.

Operate the close and change process

Sales operations owns delivery and product evidence. The tax owner approves registrations, supply rules and changes. Accounting reconciles each liability from invoice through credit and return workpaper. The ERP owner maintains effective dates and proves that the integration preserves separate components.

For each close, compare invoice tax details with the corresponding control accounts. Explain adjustments, rounding, manual postings and credit notes individually. Match return totals to the approved invoice population, then record the submission acknowledgement and payment separately. Restrict changes to filed periods so that a refreshed report does not quietly replace the evidence supporting an already submitted return.

Keep a change log for official guidance. Distinguish enacted or operative treatment from proposals, postponed changes and historical examples. The British Columbia service pause is a practical reminder that a dated announcement is not enough to authorise production configuration.

Completion checklist

Use the Canadian tax component worksheet. Related guides cover multiple registrations in one company and invoice, tax and ledger currencies.

Sources checked 17 October 2026. The selected goods example does not determine every Canadian province's rules or the treatment of services, exempt products or cross-border sellers.

Worksheet: Canadian tax component reconciliation worksheet

Copy this worksheet for each case. It records decisions and evidence; it does not determine the tax or legal treatment.

Show the worksheet

Use with the Canadian workflow guide. The rehearsal assumes approved registrations and ordinary taxable goods; classify real supplies separately.

Registration and supply approval

Component reconciliation

Record net price, GST/HST, PST, QST and gross separately on every invoice and credit. Match each component to its registration and control account. Keep purchase-tax recoverability decisions outside this sales example.

Rehearsal: three1,000 sales produce Ontario HST130, BC GST 50/PST 70, Quebec GST 50/QST 99.75. Gross3,399.75 equals revenue 3,000 plus tax 399.75. BC credit224 reverses net 200, GST 10 and PST 14. Remaining gross 3,175.75 equals revenue 2,800 plus tax 375.75.

Failure and completion

Review current guidance before activating proposed or postponed tax changes.

Vendor documentation is cited only as an example of the level of evidence to ask for; it is not a recommendation or a ranking. This guide is general information, not tax or legal advice. Checked 2026-10-17.

Related: Glossary – abbreviations and terms used in these guides (SAF-T, Peppol, CTC, EN 16931, IFRS and more).

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