How to Reverse Calculate Quebec Sales Tax
To back out the 14.975% sales tax from any Quebec receipt or invoice, use the standard algebraic reverse formula:
For a total of $100.00 CAD:
- Total Paid: $100.00 CAD
- Pre-Tax Base: $100.00 ÷ 1.1498 = $86.98 CAD
- Total Tax Owed: $100.00 - $86.98 = $13.02 CAD
Breakdown: GST Portion (33% of tax): $4.35 CAD | QST Portion (67% of tax): $8.68 CAD
