Applying online is our preferred way for you to apply for citizenship and helps us to process your application faster. To start an online application you will need to create an ImmiAccount and lodge your application.
The Australian Citizenship website provides further information.
See: Australian Citizenship
If you are unable to apply online you will need to submit the paper application for Australian Citizenship by descent to our Embassy in Brasilia; processing time is approximately 4 weeks. Please allow additional time for documents to be couriered.
Certificate of Evidence of Australian Citizenship
See : Proof of Citizenship