GST + PST Calculator (Canada)
Use this calculator to add GST/PST to a subtotal, or reverse-calculate taxes from a tax-included total.
For HST provinces, the combined HST rate is placed in the GST field and PST is set to 0%.
What is a GST and PST calculator?
A GST and PST calculator helps you quickly calculate sales tax in Canadian provinces where taxes are split between federal and provincial portions. Instead of doing manual math each time, you enter your amount, choose whether it is before-tax or after-tax, and get an instant breakdown of tax amounts and final totals.
This is especially useful for business owners, freelancers, bookkeepers, and shoppers who want to understand exactly how much tax is being charged.
How to use this calculator
1) Enter your amount
Type the dollar amount in CAD. You can enter cents, such as 49.99.
2) Choose amount type
- Before tax: Adds GST and PST to your base price.
- After tax: Works backward from a tax-included total to estimate pre-tax amount and tax portions.
3) Select a province preset (or manual)
The preset rates automatically fill common provincial tax values. If you need a custom scenario, choose Manual rate entry and edit the rate fields yourself.
4) Click Calculate
You will see a full tax breakdown including subtotal, GST amount, PST amount, combined rate, and final total.
Common GST/PST rates in Canada
Here are typical rates used in many calculations:
- British Columbia: GST 5% + PST 7%
- Saskatchewan: GST 5% + PST 6%
- Manitoba: GST 5% + PST 7%
- Quebec: GST 5% + QST 9.975%
- Alberta / Yukon / Northwest Territories / Nunavut: GST 5% only
- Ontario, Nova Scotia, New Brunswick, PEI, Newfoundland and Labrador: HST model (single combined rate)
Note: Tax rules and rates can change. Always confirm official rates for compliance and filing.
The formulas behind the calculator
Adding tax to a subtotal
GST amount = Subtotal × (GST rate ÷ 100)
PST amount = Subtotal × (PST rate ÷ 100)
Total = Subtotal + GST amount + PST amount
Extracting tax from a tax-included total
Subtotal = Total ÷ (1 + (GST rate + PST rate) ÷ 100)
GST amount = Subtotal × (GST rate ÷ 100)
PST amount = Subtotal × (PST rate ÷ 100)
Why this matters for budgeting and bookkeeping
Separating taxes from revenue is essential for clean records. If you treat tax-included payments as pure income, your books can overstate earnings and create issues at filing time. A proper GST/PST breakdown helps with:
- Accurate invoices and receipts
- Monthly and quarterly tax tracking
- Cash flow planning
- Reducing surprises at remittance time
Frequently asked questions
Is this calculator only for businesses?
No. Consumers can also use it to estimate checkout totals and compare prices across provinces.
Can I use it for HST provinces?
Yes. The calculator supports HST by using the GST field for the full HST rate and setting PST to 0%.
Does this replace professional tax advice?
No. This is a practical estimation tool. For filing and compliance, consult official CRA/provincial guidance or a tax professional.
Final thoughts
A reliable GST and PST calculator saves time and reduces math errors. Whether you are running a business, preparing invoices, or just checking prices, you get faster decisions with clearer numbers. Bookmark this tool and use it whenever you need quick Canadian sales tax calculations.