Am I missing something ? as it seem pretty black and white to me that they want the full amount back. I'm not sure how else you can interpret it, looking at the email then sent sent me the reply was sent from payroll, and the CC my site HR as well as the global HR
I can send screenshot of everything if peeps like
I look at my pay slips the over paided amount was the above stated,
fine what could say HMRC will pay be back on the tax but when?, what about the NI contributions, the pension and student loan payments too. Are people really saying I need to be out of pocket and then chancse up several originations to get some of it back again? for a mistake thats not mine
That's nuts.
What you are missing is that one way it could be interpreted is that they want to get their £1260.35 GROSS pay back. There is no need to get HMRC involved, or pension, or student loans. You don't need to get any money from them. Your employer just needs to give them less money in future, just like they need to give you less money in future.
All that needs to happen is for them to reduce your future gross pay by £1260.35. What they want to discuss is a suitable schedule, instead of just docking £1260.35 from your next pay slip (maybe you spent the advanced monies and live from one paycheque to the next).
Effectively what you've had is an advance in future pay. You are not "out of pocket", quite the opposite in fact - you are "in pocket" because you've been given money you haven't earned yet now the employer just needs to offset your future earnings to correct it. Because it doesn't span a tax year, it should make things easy.
The key thing to clarify them is what they mean by "repayment" - my assumption is that any competent payroll department would proceed as I have suggested above. It's arguably ambiguous terminology as really the 'repayment' isn't you paying anyone any money, it is them paying you less money.