Reverse Alberta GST Calculator

Alberta has levied no provincial sales tax since 1937, making it the only province to have repealed one rather than never introduced it. Everything taxable sold at retail in Alberta carries the 5% federal GST and nothing else, so every ordinary receipt in the province reverses with the same divisor: 1.05. A $100.00 total is $95.24 of goods and $4.76 of GST. There is no provincial exemption list to check, no second rate for restaurant meals, and no date-sensitive provincial rate change to look up.

The exception is accommodation. Alberta charges a 4% Tourism Levy on short-term stays — hotels, motels, B&Bs, and most Airbnb-style rentals. It is not GST, it is not recoverable as an input tax credit, and it sits alongside the 5% GST rather than inside it. Dividing a hotel folio by 1.05 treats the levy as GST and overstates the claimable tax by roughly the whole levy. Reverse the room charge using the lines the folio itemizes, and leave the Tourism Levy out of the ITC figure entirely.

Because Alberta's only sales tax is the federal GST, 100% of the tax extracted from a taxable Alberta receipt is recoverable by a GST-registered business as an input tax credit. There is no non-recoverable provincial slice to strip out first, as there is in British Columbia or Saskatchewan next door, and no separate provincial return.

That makes the reverse calculation unusually high-leverage for Alberta businesses: every dollar correctly identified is a dollar recovered. The CRA's simplified ITC method expresses the same operation as a tax fraction of 5/105 applied to tax-included purchases — $1,000.00 × 5/105 = $47.62, which is the same answer as $1,000.00 ÷ 1.05 = $952.38, leaving $47.62.

Two categories still produce a zero: basic groceries and prescription drugs are zero-rated, so an Alberta grocery total typically contains no extractable tax at all, and residential rent, most health care, and educational services are exempt. Reversing those totals produces a number that was never charged.

Alberta's neighbours all charge provincial tax — British Columbia at 12% combined, Saskatchewan at 11%, the Northwest Territories at 5% like Alberta. An Alberta business reconciling expenses from a trip to Vancouver or Regina cannot apply the 1.05 divisor to those receipts: a $112.00 Vancouver receipt divided by 1.05 reports $5.33 of GST when the actual federal slice is $5.00, with the remainder being non-recoverable BC PST.

The rule that keeps this straight is that GST/HST follows the place of supply, not the head office. Sort receipts by where the supply happened before reversing anything, and reserve 1.05 for the Alberta ones.

To back out the 5% sales tax from any Alberta receipt or invoice, use the standard algebraic reverse formula:

For a total of $100.00 CAD:

• Total Paid: $100.00 CAD
• Pre-Tax Base: $100.00 ÷ 1.0500 = $95.24 CAD
• Total Tax Owed: $100.00 - $95.24 = $4.76 CAD

Breakdown: GST Portion (100% of tax): $4.76 CAD | PST Portion (0% of tax): $0.00 CAD