I have a client who has had and is consistently having issues with his PAYE scheme and after repeatedly corresponding with HMRC, we cannot find where the issue is coming from. He is basically receiving PAYE underpayment letters, however, every month, he pays the exact amount that's instructed by us but for some reason, the figures keep changing. My last resort is basically to cease his current scheme and process as of the 6th October via the new one. I'm aware that a mid year transition is optimistic... Has anyone done this before? Tia.