What is Tax Bracket?
A tax bracket is a band of income taxed at a particular rate. The federal system has seven of them, and your income can span several at once.
How it works
The brackets are marginal, which is the part people miss: your first dollars are taxed at 10%, the next band at 12%, and so on up the ladder. "Being in the 24% bracket" only describes the rate on your top dollars — not your whole paycheck.
A quick example
What people get wrong
Don't turn down a raise or a bonus because it "pushes you into a higher bracket." Only the income above the threshold is taxed more — you always keep more money after a raise.