Overstaying your Australian tourist visa is taken very seriously by the Australian Department of Home Affairs, which can lead you to face severe consequences, including:
- Your visa becomes invalid
 - You may be detained and removed from Australia
 - You are considered an unlawful non-citizen
 - A lifetime ban from re-entering Australia
 - Have to face financial penalties
 
Contact the Department of Home Affairs to explain your situation and make arrangements to leave Australia.