If you've created invoices that do not have GST and should have, here's how to fix it:

  1. Select Reports from the left menu.
  2. In the Go to Reports field, enter Transaction List by Date.
  3. Select Customise.
  4. Select the correct date range.
  5. Under Rows/Columns, select Change Columns.
  6. Select Tax Amount.
  7. Select Run Report.
  8. Select each invoice that’s missing GST, add the GST, and save.