How Do I Process Single Touch Payroll When Moving From Another Payroll Program?

The ATO offers several methods to switch payroll providers when it comes to Single Touch Payroll, as explained here.

We recommend the Zeroing Out Method (if your previous software allows it):

1. Before you transfer the YTD (Year-to-Date) amounts to Lightning Payroll, you would need to send an Update Event from the previous software that show all the YTD amounts for your employee/s as zero.
2. Transfer your employee/s YTD amounts into Lightning Payroll via the Pays screen or by making YTD Adjustments under Employees >> Year to Date >> Adjust YTD Totals.
3. Start sending STP regularly through Lightning Payroll.

This will notify the ATO that you have made these changes.