If you are about to start a form you have an option to Select "Lodgement date".
Note, "Lodgement Date" is automatic date from ATO, but you can also manage to change it if necessary.
You will notice that the "Lodgement Date" that you have set up will be your form Due date.
You can manage to change the Due date by clicking the date next to "Draft" or form status.
From below example, we will adjust the due date from "15 May 2019" to "25 June 2019".
Form "Due date" is now adjusted to 25 June 2019.
Click here on how to sort/filter date.
It's possible to change the due date on BAS too. But it changes the due date in LodgeiT only.
A form must be in Draft state.
The due date displayed on the BAS won't change since it the date set by ATO and we cannot change it.