Hi AllisonBeth,
Welcome to the Community! It's great that you're using QuickBooks Self-Employed to manage all of your business activities. I can shed some light on GST and the Tax Summary report.
QuickBooks Self-Employed uses the cash basis of accounting, which means that income and expenses are recognized at the time of payment as opposed to the more commonly used accrual basis, which recognizes income as of the invoice date. If you're referring to GST related to an outstanding invoice, the GST for that invoice won't appear on the Tax Summary report until the customer pays you for the invoice. You can learn more about the Tax Summary report and about cash versus accrual basis of accounting from the following links:
Please let me know if you have any other questions, I'm here to help!
