Hi minifridgetheatr,
It's a pleasure to see you in Community. Welcome! Recording your transactions with the associated sales tax, is essential in keeping aligned with government guidelines. QuickBooks Online provides the ability to create group sales tax rates, so you can apply them to your transactions effortlessly.
Should you have additional questions about the Saskatchewan Liquor Consumption tax, I encourage you to speak with an accounting professional for their expertise an best course of action. If you don't have an accountant, we can help you locate a ProAdvisor in your area.
With regards to QuickBooks Online automatically adding sales tax when importing transactions from Square, you'll need to make sure the tax codes are completely identical between Square and QuickBooks. This will ensure they're automatically mapped to the correct account.
If you have any other questions, please don't hesitate to reach out. We would be glad to help!