Quebec Reverse GST + QST Calculator
Quebec charges 5% GST then 9.975% QST on the GST-inclusive subtotal—about 14.975% effective. Use compound math or divisor ≈1.14974, not Ontario's 1.13.
Enter the total you paid (GST + QST included) and your rate.
Step 2 — Your breakdown
We reverse the tax using the standard formula:
Enter a total and tax rate to see your breakdown.
Quebec did not join HST. B2B invoices often show TPS (GST) and TVQ (QST) on separate lines. Consumer receipts may show one tax-included total requiring compound reverse calculation.
A C$1,000 pretax item becomes roughly C$1,149.74 out the door: C$50 GST plus C$99.74 QST—not a flat 14.975% of pretax alone.
Shoppers comparing Ontario and Quebec prices must use different divisors. Ecommerce platforms configured with flat 14.975% on pretax slightly under-collect versus compound rules.
French and English receipts should still document how tax-inclusive shelf prices were split for audit trails.
Quebec small businesses may use simplified reporting for QST while still filing GST to CRA. When a consumer receipt shows one tax-included total, compound reverse math isolates the pretax base Revenu Québec expects on your books before claiming input refunds.
Cross-border ecommerce from Montreal warehouses must charge Quebec compound tax on taxable deliveries to Quebec addresses. Never apply Ontario 1.13 divisors to TVQ/TPS lines on bilingual invoices destined for Quebec City or Gatineau buyers.
Quick method: pretax ≈ total ÷ 1.1497375 for standard taxable supplies. Alternatively divide by 1.05 for GST portion first, then isolate QST from the remainder.
| Rate | Category | Examples |
|---|---|---|
| 14.975% combined | Typical combined rate | Federal GST plus Quebec sales tax on taxable supplies. |
| GST 5% | Federal component | Applies across Canada; provinces may add PST/HST on top. |
| Varies | Provincial portion | In Quebec, provincial rules determine the full rate on taxable goods and services. |
Headphones sell for C$1,149.74 tax-included from a C$1,000 pretax list with standard GST+QST.
Pretax C$1,000 | GST C$50 | QST C$99.74 | Total C$1,149.74
File QST to Revenu Québec and GST to CRA. Keep invoices showing both taxes or documented splits from tax-inclusive pricing.
Effective rate is ~14.975%, but QST applies after GST on the subtotal—order matters for reverse math.
No. Ontario uses one 13% HST; Quebec uses GST plus QST.
Revenu Québec, separate from CRA's GST administration.
Approximately 1.1497375 on standard taxable totals.
