Really is difficult to generalize this at all because where you live makes a huge impact on how much money is left after spending on rent or mortgage etc, and the economy needs people to live in all different places so is not like we can all just choose to live where is cheaper. Any generalization such as a definition of middle income over such a wide number of variables tends to make the generalization of limited value.
I would tend to think that 80K would be middle income, and 150K+ high income - I certainly wouldn't think of 150K+ as middle income - just looking at the sort of jobs that offer 75K a year and then thinking about how many families in Australia would have two people in those sorts of jobs to give combined of 150K (or even an 100 + 50, or one 150K) I would think that if 150K+ was middle income that would put something like 75% of Australians into low income households, as simply not enough of those higher paying jobs.
Also just looking at Median household income (all incomes in a line pick the middle one) in 2007/2008 was 66,890 so has probably gone up a bit since then but not to the realms of 150K+. (google median household on wiki - there is also an interesting table showing differences between Median in the different states, (ACT nearly double TAS).
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