Deduction

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Deduction may refer to:

in 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

in 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

in Grammar:

Other uses: