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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

• English modals of deduction, English modal verbs to state how sure somebody is about something.
• Deduction (food stamps), used in the United States to calculate a household's monthly food stamp benefit goods

See also

• Induction (disambiguation)

• Disambiguation pages