The SIF can be used to update an employee’s personal details at the same time as uploading contributions. There is no need to upload only changed records, SIF will ignore any information on the file that matches that currently on the platform and will only update changes.
You can use SIF to maintain records for all your employees whether they are the active members of the retirement plan or not. You will not be able to maintain records for any ex employees.
For further information in relation to the SIF, please see the SIF Guide.