Payday filing is a new way of reporting employee pay details to the IRD. Instead of sending an Employer Monthly Schedule (IR348) every month, under payday filing you generate and upload an Employment Information (EI) return file for every pay run. The EI return file contains the same information as the IR348, as well as ESCT amounts for each employee and dates for the pay run. Information about new and departing employees in the pay is also sent to the IRD in an Employee Details file.
Some employers choose to keep their executive payroll and their main payroll separate. Because you can only lodge one Employer Monthly Schedule (IR348) with Inland Revenue, you will need to amalgamate (combine) the files before you submit them.