Your visa can be denied, refused or rejected for many different reasons. But the most primary and possible reasons are the following: If you submit wrong information or unclear information. If you fail to prove that you have no intension to overstay in Australia. If your travel purpose is ambiguous. If you fail to prove that you or your sponsor has enough funds to support your trip. Weak travel history Not enough funds Fake or misleading information Not telling truth about previous visa application refused from other countries, namely from UK, USA, Canada, New Zealand etc.