Original article by David Uren
The Australian – Page: 4 : 20-Oct-17

The Parliamentary Budget Office estimates that personal income tax will account for 12.5 per cent of Australia’s GDP by 2020-21. This compares with 11.3 per cent of GDP at present and a record low of 9.3 per cent in 2009-10. The Federal Government’s May 2017 Budget had forecast that revenue from personal income tax will top $A253bn in 2021, which is 30 per cent higher than in 2016-17. Factors such as "bracket creep" and an increase in the Medicare levy to finance the National Disability Insurance Scheme are expected to offset low growth in wages.

CORPORATES
AUSTRALIA. PARLIAMENTARY BUDGET OFFICE, AUSTRALIA. DEPT OF THE TREASURY