Wrong student loan plan after first FPS? Keep declaration, payslip and correction proof together.
A student loan setup error is not just a deduction issue. Payroll needs the employee answer, any P45 or HMRC instruction, software change, corrected payslip treatment and FPS audit trail.
Direct answer
Can payroll refund a student-loan over-deduction?
For a current-tax-year over-deduction, HMRC normally tells the employer to repay the employee where possible and amend year-to-date payroll records. But if an SL2 or PGL2 stop notice has been received, the employer must not make that refund: the employee should contact the Student Loans Company.
HMRC guidance, payroll software and official notices control. This is an operational checklist, not payroll or tax advice.