I realize we're in different countries so that might be why; I have no idea how it works in Australia. But in the US the more money you make, the higher your tax %.
The 2011 tax brackets are:
Tax Bracket......Single......................Married Filing Jointly........Head of Household
10% Bracket........$0 – $8,500............... $0 – $17,000................$0 – $12,150
15% Bracket........$8,500 – $34,500.........$17,000 – $69,000.........$12,150 – $46,250
25% Bracket........$34,500 – $83,600.......$69,000 – $139,350........$46,250 – $119,400
28% Bracket........$83,600 – $174,400......$139,350 – $212,300......$119,400 – $193,350
33% Bracket........$174,400 – $379,150....$212,300 – $379,150......$193,350 – $379,150
35% Bracket........$379,150+..................$379,150+...................$379,150+
So to compare the bottom and top of the brackets:
Taxable Income...............Tax
$0 – $8,500........................10% of taxable income
$379,150+.........................$102,574 plus 35% of excess over $379,150
The higher incomes lose significantly more of their earnings (~1/3) by percentage than the not-so-wealthy (1/10). Does it work differently there?