Before you start working in Australia, you must register for a TFN from the Australian Taxation Office (ATO). You will be asked to provide your TFN to your employer prior to starting work. If you do not provide your TFN, you will be taxed at a higher rate.
Paying tax in Australia
Once you have been in Australia for more than six months, you must submit a Withholding Declaration form to your employer so that you can pay tax on any money you earn.
At the end of each financial year (June 30), you will receive a Payment Summary from your employer. You must use this document to lodge an annual tax return with the ATO.