If an employee re-joins after leaving then HMRC rules state that they should be treated as a new employee and be given a new payroll code.
We try to make this easy for you by giving you an option to Rehire an employee.
Go to the record of an employee that has left. There is a button at the top of the page (and on the "More.." sub menu) labeled "Rehire".
Click the button and we'll create a new employee record with all of the same details.
You'll need to potentially re-join a pension scheme and add benefits, etc. But the core details will be pre-filled and a new payroll code assigned.
If the employee is re-joining in the same tax year that they left then we'll take your previous YTD figures and use them on the Opening Balances page as their "Previous Employer" figures.