Deduction

Deduction may refer to:

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

Logic

• Deductive reasoning, inference in which the conclusion is of no greater generality than the premises
• Natural deduction, an approach to proof theory that attempts to provide a formal model of logical reasoning as it "naturally" occurs
• Logical thinking

Taxation

• Tax deduction, variable tax dollars subtracted, (or deducted,) 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