In a progressive tax system, if a person moves from one income bracket to a higher income bracket both the marginal tax rate and average tax rate will be higher.
An increase in income moves you into a better tax bracket, you simplest pay the better tax rate on the part of your earnings that falls into that bracket. You don't pay a better price for all your profits. That said, it's an excellent concept to look at how the extra earnings out of your enhancement may have an effect on your big picture.
Modern taxes impose low tax prices on low-income earners and better costs on people with better earnings, whilst people are charged an equal tax fee irrespective of how a lot of earnings they earn.
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