CSLM10120 - FAQs: employers questions and answers: can I deduct more to help the employee pay off their loan?
Suggested answer
No. You should only deduct the amounts as calculated by your payroll software.
If the employee wants to pay off more than the statutory amount they should access gov.uk website for information on how to do this.
These payments would not replace the deductions that you have to make but would be in addition to the regular decutions you make for the employee via payroll.