To make the changes needed there are a couple steps below that you would need to follow:
Unlocking the Pay Run:
Once the Pay Run is unlocked you can then adjust the pay period with below:
If the dates are valid, the pay period will be updated.
Once your Pay Run is adjusted and your pay run is finalised, you will see the Publish Pay Slips button in the pay run actions bar.
This will conclude the changes you need to make.
Hope this helps,
Then the final step! Is to lodge with ATO which can be done through an Update Event:
An update event can only be created by these steps
Please Note: Whilst for peace of mind you can run an Update Event which will update the ATO of all current year-to-date figures (YTD), the ATO is only concerned with changes to YTD figures, meaning your changes in pay period is only a concern for those lodging payruns or company owners, not the ATO, as they do not register pay periods only earnings. Of course though it is entirely up to you if you wish to do so.