Hi Vincent53,
Thanks for reaching out, and warmest welcome to the MYOB Community Forum!
Change can feel daunting, but I'm here to support you every step of the way. Let's make this transition as smooth as possible together! Regarding your STP finalisation and processed pay runs in MYOB, I recommend reversing any processed runs first before finalising. This ensures accurate payroll figures reported to the ATO. You can find detailed steps on how to reverse a pay run here. Once reversed, follow these steps here to finalise via STP. Not finalising in MYOB before Xero usage might trigger issues, like an ATO error code (e.g., invalid software ID) when reporting pay runs. Finalising in MYOB ensures the ATO is notified of your transition from MYOB for payroll reporting.
Feel free to post again anytime if you require further assistance.
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Best regards,
Doreen