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WordNet
income bracket

n. a category of taxpayers based on the amount of their income [syn: tax bracket, income tax bracket]

Wikipedia
Income bracket

Income bracket is the bandwidth from a basic wage towards all possible salary components and is used to give employees a career perspective and to give the employer the possibility to reward achievements.

In governmental terms, entire populations are divided into income brackets. These brackets are used to categorize demographic data as well as determine levels of taxation and benefits.