When will I be charged for using Airtax? Bridget Connally October 24, 2018 06:33 Updated You only pay for Airtax if you use the service to prepare and lodge a BAS and or income tax return. We will charge your credit card when you finalise the submission of the BAS or income tax return. Related articles Airtax refer a friend program Tax Companion Airtax vs accountant - which option is better for you? Speak to a Tax Agent about your BAS What if I make a mistake?