tax bracket
A band of income with its own rate attached.
A range of taxable income to which a single statutory rate applies under a graduated schedule.
What that means in practice
Income is sliced into bands, and each band has its own rate. You pay the lowest rate on the first slice, a higher rate on the next, and so on. Nobody pays their top rate on all their money. Moving into a new bracket only affects the money inside that bracket.
Brackets define a piecewise-linear liability function: each tranche of income is taxed at its own rate, so total liability is the sum across tranches rather than a single rate applied to the whole. ⚠️ The boundary convention matters at the margin — the dollar reaching a threshold is taxed at the old rate and the new rate begins above it — which is why threshold arithmetic must be done in integer units rather than by rounding.
Questions people ask
Who decides this — the federal government or my state?
Two governments, independently. The federal rule and your state's rule share a name and nothing else. So tax bracket can mean one thing on your federal return and another on the state one.
Do I need to understand other terms before this one makes sense?
This one does not stand alone. Several related terms are linked below. tax bracket is easier to hold once they are in place.
I have seen this called something else. Is it the same thing?
Same thing, different label. tax bracket has more than one common name, and the page lists them precisely because searching the wrong one leads nowhere.
At which level of government is this determined?
Income tax concepts are defined independently at federal and state level. States may conform to the federal definition, conform selectively, or define their own; conformity is legislated and can be static (tied to a fixed date) or rolling. ⚠️ A federal change therefore propagates to some states automatically and to others only by subsequent state action.
What conceptual dependencies does this term carry?
This term has multiple conceptual dependencies, enumerated in the related-terms list. Definitions in tax law are frequently mutually referential — a provision's meaning depends on defined terms elsewhere in the code — so isolated reading commonly produces error.
What alternative designations refer to this concept?
This concept is referred to by multiple designations across statutory text, agency guidance, payroll documentation and common usage. The alternatives are enumerated on this page. ⚠️ Terminology divergence is a frequent source of error where a statutory term and its colloquial equivalent are not exactly co-extensive.