What does Airtax cost? Bridget Connally March 13, 2018 12:52 Updated The cost to lodge each BAS is $49 (including GST). The cost to lodge each ITR is $99 (including GST). ABN and GST registrations are free. Related articles Pricing / Fees Uber fees and GST Airtax vs accountant - which option is better for you? Do Uber drivers have to pay GST? How does Airtax work?