The Banjo Prize & Vogel Award
There's a new fiction prize called The Banjo. Australians over 18 can enter. Entries close 5.00pm AEDT Friday 25 May 2018 and you can find more details here http://www.harpercollins.com.au/thebanjoprize/.
And if you're between 18 and 35 you should definitely consider the Australian/Vogel's Literary Award. It offers prize money of $20,000 plus publication by Allen & Unwin with an advance against royalties. Entries close 31 May - https://www.allenandunwin.com/being-a-writer/the-australian-vogel-s-literary-award