Payroll information cannot be modified after the payroll has been executed. Such changes can lead to differences in the compliance calculations, and it is often not possible to make modifications retrospectively. 

Hence, if you need to make changes to past payroll that has already been executed, we suggest that you make the required changes to upcoming payrolls. For example, if an employee's salary needed to be increased, then add the additional amount for payrolls that have already been executed as arrears in an upcoming payroll. That way, your past calculations will not change, and the employee will get the required modifications in their next payroll.

It may also be a requirement to pay the arrears to the employee immediately. In that case, after adding the arrears to next month's payroll, you can follow it up with a salary advance.