Is there a way in Quickbooks Online Payroll to notify HMRC that my PAYE scheme is closing? HMRC says it should be done as part of an EPS but I don't see where that may be

Good day, tim83.

You'll need to use the basic payee tools to confirm this. Here's an attached link for more information: https://www.gov.uk/basic-paye-tools.

Furthermore, to make sure HRMC receives the a notification for closing Paye Scheme, I suggest contacting them to verify this.

Be sure to drop me a reply if you have additional questions. I'd be more than happy to help. Stay safe and have a good one.