Longman Dictionary of Contemporary English
tax bracket
noun
EXAMPLES FROM CORPUS
▪ It's all to do with the £19,250 tax bracket and engines below 2 litres.
▪ Name the ethnicity, tax bracket or wardrobe, and they were there in full force.
▪ The key is, does your tax bracket justify buying munis?
▪ Together, that amounts to an annual tax saving of up to £1,000, compared to cars in a higher tax bracket.
▪ Two investors, both in 28 percent tax bracket, save $ 2, 000 annually at 8 percent.
▪ We begin paying income tax at 25 percent once we move into the tax bracket.
▪ Why should you and I be in the same tax bracket as Steve Forbes?
Wiktionary
tax bracket
n. A range over which a piecewise linear, generally progressive, tax is linear.
WordNet
tax bracket
n. a category of taxpayers based on the amount of their income [syn: income bracket, income tax bracket]
Wikipedia
Tax bracket
Tax brackets are the divisions at which tax rates change in a progressive tax system (or an explicitly regressive tax system, although this is much rarer). Essentially, they are the cutoff values for taxable income — income past a certain point will be taxed at a higher rate.