Please follow the below procedure to process a Leaver and generate the Form P45:

1. Input the leaving date of the employee under employee details, refer attached.

2. Run and submit the payroll to HMRC to update them. It is necessary to run at least a single payroll to notify the Leaver to HMRC and generate the Form P45.

3. Once done you may download the P45 by following the below link:

Reports>>Additional Forms>> P45

Please refer below screenshot for more help.

Watch here how to record an employee as leaving and generate P45