In the 2020 tax year, there were 15,000,000 individuals that lodged tax returns, with net tax of $225 billion.
3% of these individuals who lodged tax returns (445,000 people) who had the highest incomes paid 29% of all of this tax (over $65 billion)
9% of these individuals who lodged tax returns (1.3 million people) who had the highest incomes paid just under half of all of this tax (over $110 billion)
Summary 1: The top ~10% of people who lodge tax returns pay ~50% of all the income tax. Or in Australia, 1.3 million people pay half of all the income tax paid.
25% of these individuals who lodge tax returns (3.75 million) who had the lowest incomes paid no tax. add the 10 million Australians who are not required to lodge tax returns and more that 50% of Australian pay no income.
Also, 60% of the individuals who are required to lodge a tax return (9,000,000 individuals) combined only paid 12% of all income tax – only $27 billion of the $225 billion.
Summary 2: the bottom ~60% of those that need to lodge tax returns pay 12% of all income tax.
Is this a “fair share”?