Reverse QST Calculator — Quebec GST + QST From a Total 2026
Enter a Quebec total that already includes tax. You get the price before tax, the 5% GST, and the 9.975% QST.
How do I remove QST from a price? Divide the tax-included total by 1.14975. The GST is 5% and the QST is 9.975% of the price before tax.
Results are estimates. Due to rounding, amounts can differ from final totals by a cent.
Invoicing Quebec Clients?
Businesses outside Quebec can add GST and QST to invoices for their Quebec clients automatically.
Create Free InvoiceHow Reverse QST Works
Quebec receipts often show a single total. These are the formulas behind the calculator.
The Reverse QST Formula
Price before tax = total ÷ 1.14975. Then GST = price before tax × 5% and QST = price before tax × 9.975%. Because each tax is rounded to the cent, the calculator puts any one-cent difference on the QST line so the three lines add up exactly to the total you entered.
Not Taxed on Tax
Until January 1, 2013 the QST was calculated on the price including GST. Since then both taxes are calculated on the same price before tax. If you are checking an old receipt from before 2013, the split will not match this calculator.
Recording a Quebec Expense
When a Quebec receipt shows only a total, splitting out the GST and QST gives you the cost to record and the tax amounts you may be able to recover: GST as an Input Tax Credit and QST as an input tax refund, if you are registered for each. For adding GST and QST to a price, use the Quebec QST Calculator.
Reverse QST Examples
Tax-included totals split into price before tax, GST, and QST
| Total (tax included) | Price before tax | GST (5%) | QST (9.975%) |
|---|---|---|---|
| $57.49 | $50.00 | $2.50 | $4.99 |
| $114.98 | $100.00 | $5.00 | $9.98 |
| $250.00 | $217.44 | $10.87 | $21.69 |
| $500.00 | $434.88 | $21.74 | $43.38 |
| $1,000.00 | $869.75 | $43.49 | $86.76 |
| $5,000.00 | $4,348.77 | $217.44 | $433.79 |
Common Reverse QST Questions
How do I calculate QST backwards?
Divide the total by 1.14975, then take 9.975% of the result. On a $1,000.00 total: $869.75 before tax, $86.76 QST, and $43.49 GST.
What is the total tax rate in Quebec?
14.975%: 5% federal GST plus 9.975% QST, both calculated on the price before tax.
How do I add GST and QST instead?
Multiply the price before tax by 1.14975, or use the Quebec QST Calculator. $100.00 becomes $114.98.
Reverse QST FAQs
Have clients in Quebec? Add GST and QST to their invoices automatically.
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For businesses located outside Quebec: iBill adds GST and QST to invoices for your Quebec clients.
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