Overpayment of wage /holiday allowance

Hi, How do I calculate the net figure of a fixed amount that an employee owes back to the company? This is 8 days of holiday overpaid as the employee terminated the contract and taken a full year allowance of holiday. The Gross amount is 915.20 Thank you

Hi ,
 

HMRC doesnt provider a calculator for this however there are calculators available by searching google. Please also note when you enter this into your payroll software it is the gross figure you use so the tax and NI is refunded to your business . Thank you .