tax bracket

今天在CNN讀到有關稅務的問題，裡面有談到
tax bracket
到底是什麼意思呢?

Under the four-year tax plan, New Brunswick will have two tax brackets by 2012. People earning less than $37,893 will be taxed at a rate of nine per cent and those earning more will be subject to an income tax rate of 12 per cent by the end of the four years.

a particular range of income levels on which the same rate of tax is paid
If you earn more money, it may put you in a higher tax bracket.

就是繳稅分級制