Online Receipt Generator
Tax & Discounts

GST Calculator

Add or remove GST, with an optional provincial PST/QST shown separately.

Result

Net amount

$100.00

GST amount

$5.00

PST / QST amount

$0.00

Total tax

$5.00

Gross amount

$105.00

Embed this calculator on your site

Copy this code and paste it into your page's HTML. The calculator is free to use and resizes itself to fit.

How it's calculated

GST and PST/QST are each charged on the net price and shown separately. When removing tax, net = gross ÷ (1 + GST + PST).

This GST calculator adds goods and services tax to a net price. It can also add a provincial PST or QST as a second line. In reverse mode, it strips both taxes out of a gross total.

The formula

combined rate = GST rate + PST/QST rate
Add tax:      GST   = net x GST rate
              PST   = net x PST rate
              gross = net + GST + PST
Remove tax:   net   = gross / (1 + combined rate)

Each tax uses the net price as its base. Neither tax is calculated on the other.

Worked example

You invoice $200 net. GST is 5% and PST is 7%.

  • Combined rate: 12%
  • GST amount: $10.00
  • PST / QST amount: $14.00
  • Total tax: $24.00
  • Gross amount: $224.00

Reverse check: choose "Amount already includes tax" and enter $224 at the same rates. The net amount returns to $200.00.

How to read the result

Look at the two tax lines, not only the total. Many businesses must report GST and provincial tax in separate boxes on a return.

Leave the PST / QST field at 0 if only GST applies. The calculator then works as a single-rate tool.

Do not subtract 12% from $224. That gives $197.12, not $200. Always divide by 1.12.

Registration thresholds, rates, exempt items and filing rules differ by country and region. Confirm them with your tax authority or an accountant before you charge tax.

Put the tax lines on your invoice with your tax registration number if your rules require one.

Related tools

Frequently asked questions

How do I calculate GST on a price?
Multiply the net price by the GST rate. At 5 percent, a $200 price has $10 of GST, so the total is $210 before any provincial tax.
How do I remove GST from a total?
Divide the total by one plus the combined rate. If GST is 5 percent and PST is 7 percent, divide by 1.12. A $224 total gives a net price of $200.
Is PST charged on top of GST?
Here, both taxes are calculated on the same net price and shown as two lines. Some regions charge tax on tax or use a combined rate. Check the rule for your province or country.
What is the difference between GST and VAT?
Both tax value added along the supply chain. The names and rules differ by country. The math is the same: add the rate to a net price, or divide a gross price by one plus the rate.
Which GST rate should I enter?
Use the rate set by your tax authority for your goods, services and location. The defaults in the calculator are examples. Ask an accountant if you are unsure.