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If you started processing STP mid-year and you had seasonal workers who worked prior to this you can run an update event to send the year to date information to the ATO- https://quickbooks.intuit.com/community/Payroll-and-STP/Create-and-lodge-an-update-pay-event/m-p/275360
You can also apply for a deferral via the ATO Portal: https://www.ato.gov.au/Business/Single-Touch-Payroll/Get-ready-for-Single-Touch-Payroll/Single-Touch-Payroll-deferrals/ or seek assistance from your Registered Agent
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