Hi Pp69,
Welcome to Community! Ensuring your sales tax is applied to your forms accurately in QuickBooks Self-Employed, is key in keeping in good standing with government guidelines. I'd be glad to assist!
To ensure your sales tax is accurately calculated and applied to your forms, I suggest reviewing your sales tax set up. Please keep in mind that QST isn't supported at this time as it's treated as a separate country/state in Canada for which it has it's own taxability terms.
Should you require additional assistance, please don't hesitate to reach out to QuickBooks Self-Employed Customer Care. They'll have the access required to look further into this from their end and ensure you're able to complete your QuickBooks goals as soon as possible!
Feel free to reach back out with other questions. We'd be happy to help!