Canadian · Sales Tax
Reverse GST calculator, Alberta.
Got a total with tax already in it? Enter it and get the price before tax and the GST that was added.
In Alberta the combined rate is 5% GST. To remove it, divide the total by 1.05. Example: $210.00 ÷ 1.05 = $200.00 before tax, so $10.00 of the total is tax.
Inputs
Result
Enter a total to see the price before tax.
How the reverse calculation works
Alberta charges only the federal 5% GST, so the divisor is 1.05.
Pre-tax price = total ÷ 1.05. Tax = total − pre-tax price. Worked examples at the Alberta rate:
- $210.00 total = $200.00 before tax and $10.00 GST.
- $31.50 total = $30.00 before tax and $1.50 GST.
Alberta totals, tax removed
| Total paid | Before tax | GST |
|---|---|---|
| $10.00 | $9.52 | $0.48 |
| $20.00 | $19.05 | $0.95 |
| $50.00 | $47.62 | $2.38 |
| $100.00 | $95.24 | $4.76 |
| $250.00 | $238.10 | $11.90 |
| $500.00 | $476.19 | $23.81 |
| $1,000.00 | $952.38 | $47.62 |
Sources, read October 2026: CRA, GST/HST rates by province (calculator page) (page details 2026-04-08). Rates change; the CRA page above is the one to check.
Frequently asked questions
How do I remove GST from an Alberta total?
Divide the total by 1.05. That is 1 plus the combined rate of 5%. The result is the price before tax; subtract it from the total to get the tax. $210.00 ÷ 1.05 = $200.00, so the tax is $10.00.
Why can't I just take 5% off the total?
Because the rate applies to the pre-tax price, not to the total. Taking 5% of $210.00 gives $10.50, but the real tax is $10.00. Dividing by 1.05 is the correct reverse.
Does Alberta have a provincial sales tax?
No. The CRA table lists Alberta at 5% GST and 0% PST. The same is true of the Northwest Territories, Nunavut and Yukon, so this 5% calculation works for them too: pick the territory in the rate box.
Will the answer match my receipt to the cent?
Usually, but not always. A seller rounds the tax on its own invoice, sometimes line by line, and more than one pre-tax price can produce the same total once rounded. This tool rounds the pre-tax price to the nearest cent and makes the tax lines add back to your total. If the receipt prints the tax, trust the receipt.
Estimate only
This is arithmetic on the rate you choose. It does not know whether the items you bought were taxable, zero-rated, exempt or taxed at a different rate, and it does not look anything up from the CRA or any provincial register. Where a receipt prints its own tax lines, use those. Verify current rates with the CRA before invoicing.