The state government in Western Australia says lower mining royalties and a falling share of GST continue to hurt its finances.
Latest quarterly financial results show the Government posted a surplus of $A70 million for the period to the end of September.
That is $A255 million less than the amount recorded in the same period last year.
The ABC reports total public sector net debt is $A15 billion.
Treasurer Troy Buswell said the results highlight the need for budgetary constraints.