PAYE UNDERPAYMENT

I have received a police pension for 14 years. In June 2022 I commenced a part time job with another public body. My tax payment for 2022-2023 is shown as correct. I've just received notification that for 2023-2024 I have and underpayment of £1000. Nothing changed in my circumstances during the 2 year period. This is PAYE , how does this happen. Could it be a mistake.

Hi Druinnes,
In this circumstance it may better for you to contact ourselves.
Please see link here, as we will need to access your record and this forum can only answer questions of a general nature.
Income Tax: general enquiries
Thank you. 
 

I have received a notification of an under payment on my PAYE Tax and was wondering is there a way to pay it back in a lump sum??

Hi Curtis,
The notification you received should have information on how to repay the underpayment. This could be either online via your Personal Tax Account, or using a cheque and a payslip.
Thank you.