Deduction may refer to:

Philosophy

  • Deductive reasoning, the mental process of drawing inferences in which the truth of their premises ensures the truth of their conclusion
  • Natural deduction, a class of proof systems based on simple and self-evident rules of inference that aim to closely mirror how reasoning actually occurs

Taxation

  • Tax deduction, variable tax dollars subtracted from gross income
    • Itemized deduction, eligible expense that individual taxpayers in the United States can report on their Federal income tax returns
    • Standard deduction, dollar amount that non-itemizers may subtract from their income

Other uses

See also

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