Via Deloitte:
Even with the amazing success Australia is achieving in the fight against the virus, the oldest problem in economics is that unemployment goes down much slower than it goes up. Subject to the important caveat that forecasts are currently subject to really wide bands of uncertainty, Deloitte Access Economics estimates that national income will fall 1.8 percentage points ($35 billion) below the official projections in MYEFO in 2019-20, followed by a jaw dropping shortfall of just under $200 billion (or 10.8 percentage points) in 2020-21.
Even worse, the recovery thereafter may well be slow: