From 1 July 2026, all STP submissions to the ATO must include a Software Service ID (SSID). This identifier uniquely identifies both your business and your payroll software to strengthen authentication and authorisation processes. You can learn more about this change on the ATO website.

Each employer will need to add their unique SSID to the ATO’s Access Manager and authorise MessageXchange (using our ABN) to send STP files to the ATO on their behalf. This link explains how to do this.

What happens if these changes aren’t made?

Your STP files won’t be accepted by the ATO unless all steps are completed on time. If we submit an STP file containing an SSID before it’s been added to the ATO’s Access Manager, the file will be rejected.