You should only be required to repay the amount of overpayment that you actually received. It is down to your employer to make arrangements for the recovery of tax and National Insurance.
You get an overpayment credit when your tax payments exceed what you owe. You'll automatically receive a refund of the credit. However, you can ask us to apply the credit as an advance payment towards next year's taxes instead of sending it to you as a refund.
You get an overpayment credit when your tax payments exceed what you owe. You'll automatically receive a refund of the credit.