Hello accounts439,

Let's check the status of the finalisation event submitted in QuickBooks Online Payroll making sure it is successful. Here's how to check the submission:

1. Click on the Payroll tab.
2. Click on Reports and choose Single Touch Payroll.
3. Select the Financial year and pay schedule.
4. Verify if all employee is set to is final and status is successful.

If the finalisation event is successful and still showing not tax ready in the ATO site. Let's create an updated pay event and tick the employee to is final. 

1. Click on the Payroll tab.
2. Click on the Reports tab.
3. Click on Single Touch Payroll.
4. Click on Create update event.
5. Select the appropriate Financial year and Pay schedule, then select Create.

Then, check if in the ATO portal it is showing tax ready.

To learn more about finalisation event in QuickBooks Online, check this link Create and lodge a finalisation event.

Drop by again in the Community if you have further concerns.