@IslanderndCity
if you give your TFN to the bank, they will automatically deduct any tax applicable for the interest earned on your account. Pag lodge mo ng ITR, normally may pre filled data na ang Tax Office, they will already see these details.
If you have your details sorted out, and you have dutifully informed that Tax Office of your earnings and losses, you can lodge an ITR using a mobile app. Maybe 6 or 7 click of a button then you are all done with your ITR.
if you dont give your TFN to the bank, you have a lawful obligation to declare ALL interest you have earned in your bank account. Then you cant use the mobile app and need to lodge using a proper ITR form. Although it is still available online, you now need to go thru 38 sections of the form with approx 100 pages.