Field help (HRPEOSTRDA) 

Enter the tax year start date (the accounting period does not necessarily coincide with the calendar year).

You can only update this date in the first generated pay period, and providing that there are no pay runs that have been created. If you update this date, the pay periods must then be re-generated (use the Generate pay periods action) to apply the changes.

For the ZAF legislation only: the year start date may not be less than Year start date – 14 days.

The maximum only applies once the company has rolled into a new tax year, then the year start date may not be more than Year start date + 14 days.

 The year start and end dates cannot be updated or deleted once the first pay period has been created.