G'day @spinachcarrott 👋
As per the ATO guidance, the date the monies are received in the fund. The super funds are required to send a transaction report to the ATO (MATS Member Account Transaction Service) that identifies the receipt date into the member account. That's the date the ATO use to detect potential SG shortfalls 🤔
Paying well ahead of time will ensure this timeline, however, Payday Super changes are coming, where there are stipulated timeframes by which the clearing houses/super funds must handle funds are changing. This should address the issue you experienced.
Run reports from your payroll solution to identify the details you need. Payroll is your source of truth for super, and possibly procurement-to-pay systems if you pay contractors eligible for SG out of accounts payable.
Deanne