Advice re net or gross salary error repayment

[Ryegella]

My employer made a payroll error with my protected pay (following organisational change) over a period of 4.5 years. Once I was alerted to it I agreed I would repay over the same time period, which I felt was reasonable. Its been a shambles trying to get information and a financial breakdown from them, and they have even started to deduct the net figure without sharing the info with me.

My query is should I repay this net as that is what I have received, and how does the overpayment on NI/PAYE get adjusted? Pointing me in the right direction would be helpful. (Please don't suggest the union as they have been a waste of time and disappointment as they don't want to rock the boat with senior management).

[Kati]

tagging Ula mariefab xx

[ULA]

I presume from what you have said you have been overpaid and have agreed to a deduction from wages over a set period of time of a given amount per month. What your employer should do is process the deduction through the payroll system so that the tax situaion is sorted out automatically.