21-Jan-2020: December BAS/IAS due
28-Jan-2020: December Quarter Super due
21-Feb-2020: January BAS/IAS due
25-Feb-2020: December Quarter BAS due
23-Mar-2020: February BAS/IAS due
21-Apr-2020: March BAS/IAS due
28-Apr-2020: March Quarter Super due
21-May-2020: April BAS/IAS due
26-May-2020: March Quarter BAS due
23-Jun-2020: May BAS/IAS due
21-Jul-2020: June BAS/IAS due
28-Jul-2020: June Quarter Super due
25-Aug-2020: June Quarter BAS due
The due dates are the date that the BAS or IAS is to be lodged AND paid by. Lodging or paying after the due date may lead the interest charges on your BAS account.
More information on due dates can be found on the ATO website.