Reverse Saskatchewan GST/PST Calculator

Saskatchewan combines 5% GST with 6% PST for a 11% headline rate, so a current taxable receipt reverses at 1.11. A $111.00 total is $100.00 of goods carrying $5.00 of GST and $6.00 of PST — and as in every PST province, only the GST slice comes back through input tax credits.

The historical divisor to know is 1.1. Saskatchewan raised its PST from 5% to 6% on March 23, 2017; receipts predating that reverse at the lower figure. The same 2017 legislative round extended PST to restaurant meals and snack foods, which is the detail that most often surprises people reversing Saskatchewan hospitality receipts: unlike British Columbia, where a restaurant tab carries GST alone, a Saskatchewan meal carries the full 11% and divides by 1.11.

Saskatchewan has no small-supplier cushion for PST. Registration is required from the first taxable sale — a $0 threshold — and it applies to out-of-province vendors selling into Saskatchewan as much as to businesses located there. That is the strictest regime in the country; by contrast, the federal GST small-supplier threshold is $30,000 in annual taxable revenue.

For a vendor selling at tax-included prices — a market stall, an event booth, a tradesperson quoting all-in — that rule turns reverse calculation into a filing obligation rather than an accounting convenience. Gross takings have to be divided by 1.11, not multiplied by 11%, to determine what belongs to the province and what belongs to Ottawa. Multiplying a tax-included total by the rate overstates the liability: $1,000.00 of tax-included sales contains $99.10 of tax, not $110.00.

Saskatchewan also charges PST on used vehicles, where several other provinces treat private sales differently. A used-car bill of sale in the province is a 1.11 calculation, and the PST portion of it is not recoverable even by a registered business buying a work vehicle.

Saskatchewan exempts children's clothing under $150, printed books, manufacturing and production equipment, farm machinery and inputs, and residential energy from PST. Those supplies carry the 5% GST alone and reverse at 1.05. Basic groceries, prescription drugs, and medical devices are zero-rated federally and carry nothing to extract.

Farm inputs deserve a specific mention in a province where agriculture drives so much of the taxable base: the exemption means a large equipment or input invoice can look like it should reverse at 1.11 while actually containing only 5%. On a $50,000 machinery purchase the difference between the two assumptions is roughly $2574.00 of misattributed tax — the kind of error that survives a whole fiscal year unnoticed.

To back out the 11% sales tax from any Saskatchewan 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 ÷ 1.1100 = $90.09 CAD
• Total Tax Owed: $100.00 - $90.09 = $9.91 CAD

Breakdown: GST Portion (45% of tax): $4.50 CAD | PST Portion (55% of tax): $5.41 CAD