Gahdangit Seran. Read your below reference in its entirety.
Quote:
Although individuals are taxed at the same rate, flat taxes can be considered regressive because a larger portion of income is taken from those with lower incomes. For example, a 6% sales tax on a $1,000 computer ($60) would take a greater portion of a $10,000 income than of a $50,000 income.
The above is talking about sales tax. A rich man and a poor man that pay 6% sales tax on a $1,000 item each pay $60. In that sense, according to your reference, the tax is regressive because $60 is a greater portion of the poor man’s income. Now rub together your last 2 remaining brain cells to think what a 6% income tax means to each. The rich man pays more than the poor man, but it’s proportionally equal. Got it?