1. What is the Quebec Sales Tax Calculator?

This calculator helps determine the pre-tax amount when you know the total amount paid including GST (5%) and QST (9.975%) in Quebec. It's useful for expense tracking, accounting, and understanding tax breakdowns.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• Total Amount — Final price including GST and QST (CAD)
• 1.05 — Represents the 5% GST
• 1.09975 — Represents the 9.975% QST

Explanation: The formula works backward from the total amount to find the original price before taxes were applied.

3. Quebec Tax Rates

Current Rates:

• GST (Goods and Services Tax): 5% federal tax
• QST (Quebec Sales Tax): 9.975% provincial tax

Note that QST is applied after GST is added to the price.

4. Using the Calculator

Instructions: Enter the total amount paid (including taxes) in Canadian dollars. The calculator will show the pre-tax amount, GST amount, and QST amount.

5. Frequently Asked Questions (FAQ)

Q1: Why are GST and QST calculated separately?
A: GST is a federal tax applied nationwide, while QST is specific to Quebec. QST is calculated on the price after GST has been added.

Q2: Are all items subject to both taxes?
A: Most goods and services are subject to both, but there are exceptions like basic groceries (GST exempt) and certain children's items.

Q3: How does this differ from other provinces?
A: Other provinces may have HST (combined tax) at different rates. Quebec is unique in having separate GST and QST.

Q4: Can I use this for business expenses?
A: Yes, this is particularly useful for businesses to determine the pre-tax amount for accounting purposes.

Q5: What if I only know the pre-tax amount?
A: To calculate forward, multiply the pre-tax amount by 1.05 for GST, then multiply that result by 1.09975 for QST.