Canada GST/HST Reverse Calculator: Remove Tax from Price (2026)

GST vs HST vs PST vs QST — Canada's Tax System Explained

Canada's consumption tax system is more complex than the US because it operates on two levels — federal and provincial — and different provinces have structured their taxes differently. Before reverse-calculating a Canadian receipt, you need to know which tax type applies.

In HST provinces (Ontario, Nova Scotia, New Brunswick, PEI, Newfoundland), the federal GST and provincial tax are collected together as one single HST charge. Your receipt shows one tax line. In non-HST provinces (BC, Quebec, Manitoba, Saskatchewan), you see two separate tax lines — GST and PST/QST — which you may need to reverse-calculate separately or combined depending on your need.

Reverse Calculation Formula for Canadian Tax

The reverse formula is identical to US sales tax — only the rate changes:

Pre-Tax Price = Total Paid ÷ (1 + Tax Rate ÷ 100)

Tax Amount = Total Paid − Pre-Tax Price

For Ontario HST at 13%: Pre-Tax Price = Total ÷ 1.13

For Quebec combined GST + QST at 14.975%: Pre-Tax Price = Total ÷ 1.14975

For Alberta GST only at 5%: Pre-Tax Price = Total ÷ 1.05

Quick reference tax factors for all Canadian rates

Step-by-Step Examples

Example 1 — Ontario HST (13%): $226.00 receipt

Total paid: $226.00. Ontario HST: 13%. Tax factor: 1.13. Pre-tax price: $226.00 ÷ 1.13 = $200.00. Tax: $226.00 − $200.00 = $26.00. Verify: $200.00 × 1.13 = $226.00 ✓

Example 2 — Quebec GST + QST (14.975%): $574.88 receipt

Example 3 — Alberta GST only (5%): $315.00 receipt

Total paid: $315.00. Alberta rate: 5% GST only. Tax factor: 1.05. Pre-tax price: $315.00 ÷ 1.05 = $300.00. Tax: $315.00 − $300.00 = $15.00.

Example 4 — British Columbia GST + PST (12%): $448.00 receipt

Total paid: $448.00. BC combined rate: 12% (5% GST + 7% PST). Tax factor: 1.12. Pre-tax price: $448.00 ÷ 1.12 = $400.00. Tax: $448.00 − $400.00 = $48.00.

Province-by-Province Details 2026

Ontario — HST 13%

Ontario is Canada's most populous province and uses a fully harmonized HST of 13% (5% federal + 8% provincial). One tax line on your receipt makes reverse calculation simple: divide by 1.13.

Ontario's HST applies to most goods and services. Key exemptions include basic groceries, prescription drugs, medical devices, feminine hygiene products, and children's clothing under a certain size. When shopping in Toronto, Ottawa, or anywhere in Ontario, 13% is your number.

Quebec — GST 5% + QST 9.975% = 14.975%

Quebec has the most complex Canadian tax structure. It collects the federal GST (5%) and its own Quebec Sales Tax (QST) at 9.975% separately. The combined rate of 14.975% is the highest of any major Canadian province.

Critically, Quebec's QST is calculated on the pre-GST price, not on the GST-inclusive price. This means the two taxes do not compound each other — both apply to the base price. To reverse-calculate: divide the total by 1.14975 to get the base price, then calculate each tax separately (base × 5% for GST, base × 9.975% for QST).

Quebec exempts basic groceries, prescription drugs, and most financial services from both GST and QST.

Alberta — GST Only 5%

Alberta is the only Canadian province with no provincial sales tax. Albertans pay only the 5% federal GST — making Alberta the lowest-tax province for consumer purchases. A $1,000 purchase costs $1,050 in Alberta vs $1,150 in Ontario and $1,149.75 in Quebec.

Alberta has historically funded its government through oil and gas revenues, allowing it to forgo a provincial sales tax. This makes reverse calculation for Alberta receipts the simplest in Canada: divide by 1.05.

British Columbia — GST 5% + PST 7% = 12%

British Columbia charges the federal 5% GST plus a 7% provincial sales tax (PST) for a combined rate of 12%. Unlike Ontario's HST, BC shows these as two separate lines on receipts.

BC's PST has notable exemptions: food for human consumption, prescription medications, and children's clothing are PST-exempt (though GST still applies to some of these). BC also exempts bicycles and bicycle equipment from PST — a notable exception that reflects provincial policy priorities.

To reverse-calculate a full BC receipt with both taxes: divide the total by 1.12. If you need to isolate just the GST portion: pre-tax × 5%. Just the PST: pre-tax × 7%.

For Canadian Businesses

GST/HST Registration

Canadian businesses with annual revenues over $30,000 CAD must register for GST/HST. Once registered, you collect GST/HST on taxable sales and remit the net amount to the CRA (Canada Revenue Agency) after deducting Input Tax Credits (ITCs).

Filing GST/HST Returns

Your GST/HST return requires you to report taxable supplies (pre-tax revenue), not gross receipts. If your accounting records only show tax-inclusive totals, reverse-calculate each transaction to separate revenue from collected tax before filing.

Filing frequency depends on your annual revenue: monthly (over $6M), quarterly ($1.5M–$6M), or annually (under $1.5M). Each period's return needs accurate pre-tax figures.

Input Tax Credits (ITCs) — Why Accurate Reverse Calculation Matters

Input Tax Credits are one of the most important concepts for Canadian businesses. An ITC allows a GST/HST-registered business to recover the GST/HST it paid on business purchases and expenses.

If you paid $226.00 (including 13% Ontario HST) for office supplies, the HST portion is $26.00. You can claim this $26.00 as an ITC on your next GST/HST return, effectively reducing what you owe the CRA by $26.00.

To claim ITCs correctly, you need the exact tax amount on each receipt. Reverse calculation — $226.00 ÷ 1.13 = $200.00 pre-tax, $26.00 tax — gives you the precise ITC amount to claim. Overestimating or underestimating ITCs creates risk in a CRA audit.

ITC rules require supporting documentation: the supplier's name, GST/HST registration number, invoice date, total amount, and the GST/HST amount charged. Keep all receipts for 6 years.

Common Mistakes with Canadian Tax Reverse Calculation

• Using the wrong province's rate. Ontario (13%) and Nova Scotia (15%) are frequently confused by travellers. A $115.00 receipt divided by 1.13 gives $101.77 — but if the purchase was actually in Nova Scotia, the correct pre-tax is $100.00 (÷1.15). Always use the rate where the purchase was made.
• Forgetting Quebec's 14.975% combined rate. Many people use 15% for Quebec (rounding up), but the correct combined rate is 14.975% — giving 1.14975 as the factor. On a $500 base, the difference is $0.13 per transaction, which compounds in bookkeeping.
• Treating GST and QST as compounding. In Quebec, both taxes apply to the base price — they do not compound on each other. Total tax = base × 5% + base × 9.975% = base × 14.975%. Not base × 1.05 × 1.09975.
• Applying HST to PST-exempt items in BC. BC's PST has broader exemptions than Ontario's HST. Children's clothing is PST-exempt in BC but may still carry 5% GST. Check the receipt breakdown carefully rather than applying a flat 12% to everything.
• Missing the $30,000 registration threshold. Small Canadian businesses under $30,000/year are not required to register for GST/HST and should not collect or remit it. If you receive a receipt from an unregistered supplier with GST charged, it may be incorrectly applied.

Canada vs US Tax Comparison

Canadian combined tax rates — ranging from 5% in Alberta to 15% in Atlantic provinces — are broadly similar to US combined rates. California at 8.68% and Tennessee at 9.55% are comparable to Ontario (13%) and Nova Scotia (15%), respectively, at the higher end. Alberta at 5% is similar to US states with low combined rates like Wyoming or Colorado's rural areas.

The key difference is structure: Canada's GST/ITC system allows businesses to recover tax paid on inputs, creating a value-added tax chain. The US has no federal VAT — each state's sales tax is a final-stage retail tax with no business recovery mechanism at the federal level.

Use our Canada tax calculator for instant reverse calculations on any Canadian receipt, or check our US calculator for American purchases.