Thanks for sharing your query here with us, usersam. I can provide details about employment allowances after migrating to Payroll Core.
For Employment Allowances, there's no need to submit a second Employer Payment Summary (EPS) even after the migration to QBO-Core Payroll if you've already submitted these taxes for this month.
However, if you haven't processed them yet, you can submit an EPS in your QuickBooks Core Payroll:
Please note the EPS is cumulative and can only be submitted between the 6th - 19th of each tax month.
Additionally, you can set up RTI (Real-Time Information) reporting to automatically send EPS to HMRC at the scheduled time.
Furthermore, I'm also including this resource for your payroll year-end guide: Year-end guide for QuickBooks Online Core Payroll.
I'll leave this thread available so you can always reply in the comments below for any additional queries about employment allowance.
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