Instantly extract GST/TPS and QST/TVQ from any total amount.
When shopping or conducting business in the province of Quebec, prices are usually displayed before tax. However, there are many situations where you only have the final receipt total and need to "reverse-engineer" the numbers to find the original price. This is known as a Reverse Sales Tax Calculation.
Quebec uses a unique tax structure compared to other Canadian provinces. While some provinces use a Harmonized Sales Tax (HST), Quebec maintains two distinct taxes: the federal GST (Goods and Services Tax) and the provincial QST (Quebec Sales Tax). As of 2026, the combined rate is 14.975%.
The manual calculation can be tricky because you cannot simply subtract 14.975% from the total. To find the correct net amount, you must use a specific divisor based on the combined tax rate.
Base Price = Total Amount / 1.14975
For example, if your total receipt is $114.98:
Use this table to quickly verify the pre-tax base price for common billing amounts in Quebec.
| Total Paid ($) | Base Price ($) | GST (5%) | QST (9.975%) | Total Tax |
|---|---|---|---|---|
| 11.50 | 10.00 | 0.50 | 1.00 | 1.50 |
| 114.98 | 100.00 | 5.00 | 9.98 | 14.98 |
| 574.88 | 500.00 | 25.00 | 49.88 | 74.88 |
| 1,149.75 | 1,000.00 | 50.00 | 99.75 | 149.75 |
| 5,748.75 | 5,000.00 | 250.00 | 498.75 | 748.75 |
Before January 1, 2013, Quebec's tax calculation was much more complicated. The QST was "compounded," meaning it was calculated on top of the GST-inclusive price. This was widely criticized as a "tax on a tax." Following a series of federal agreements, Revenu Québec aligned with the rest of Canada, making both taxes apply only to the sub-total.
In Montreal, Quebec City, and across the province, you will see TPS and TVQ on every commercial invoice.
Our calculator simplifies this by splitting the total into these two distinct buckets, making it easier for accountants and business owners to file their returns.
When businesses purchase goods for resale or operation, they pay sales tax. Most of this tax is recoverable through government credits:
If you don't calculate the split accurately, you risk missing out on significant refunds during your annual tax filing.
Revenu Québec has strict audit protocols. If a business fails to accurately separate GST and QST, or uses an incorrect rounding method, they can face penalties of up to 15% of the unpaid tax amount, plus interest. Using a verified tool like our 2026 Quebec Reverse Tax Calculator ensures your math is always compliant with current regulations.
Not all goods carry the 14.975% burden. Major exemptions include:
No. Ontario uses 13% HST. This tool is specifically for Quebec's dual-tax system (14.975%).
Yes, all calculations are updated for the current 2026 tax year as per Revenu Québec guidelines.
Disclaimer: This tool is for informational purposes. For official financial advice, please consult a certified CPA or visit official government portals.