Last updated: May 2026
GST and QST in Quebec (Quick Answer)
In Quebec, businesses charge:
- 5% GST (federal tax)
- 9.975% QST (provincial tax)
👉 These taxes are separate and must be shown clearly on invoices.
What Is QST?
QST (Quebec Sales Tax) is a provincial tax applied in Quebec in addition to GST.
Unlike HST provinces, Quebec keeps its provincial tax separate, meaning businesses must calculate and display both taxes individually.
Quebec Tax Rate Breakdown
| Tax Type | Rate |
|---|---|
| GST (Federal) | 5% |
| QST (Quebec) | 9.975% |
| Total | 14.975% |
When Do You Charge GST and QST?
- Your customer is located in Quebec
- Your product or service is taxable
- You are registered for GST/HST
👉 Always charge tax based on your customer’s location, not your own.
Example: GST + QST Calculation
| Service | $100.00 |
| Subtotal | $100.00 |
| GST (5%) | $5.00 |
| QST (9.975%) | $9.98 |
| Total | $114.98 |
How to Calculate GST and QST
- GST = Subtotal × 0.05
- QST = Subtotal × 0.09975
Total = Subtotal + GST + QST
Do You Always Have to Charge QST?
Not always — QST depends on your business activity and whether your sales are taxable.
When Do You Need to Register?
You must register once your business earns:
👉 $30,000 in revenue over 12 months
Common GST/QST Mistakes
- Combining GST and QST incorrectly
- Using wrong QST rate
- Not showing both taxes separately
How to Show GST and QST on an Invoice
- Subtotal
- GST (5%)
- QST (9.975%)
- Total
Tools to Calculate Quebec Taxes
FAQ
What is QST?
QST is Quebec’s provincial sales tax applied in addition to GST.
Do I charge both GST and QST?
Yes, if your customer is in Quebec and your sale is taxable.
Is QST included in GST?
No — they are separate taxes.
Final Thoughts
Quebec’s tax system requires careful calculation, but once you understand it, invoicing becomes straightforward.