Deduction may refer to:
Philosophy
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Deductive reasoning
Deductive reasoning is the mental process of drawing deductive inferences. An inference is deductively valid if its conclusion follows logically from its premises, i.e. if it is impossible for the premises to be true and the conclusion to be fals ...
, the mental process of drawing inferences in which the truth of their premises ensures the truth of their conclusion
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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
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Tax deduction
Tax deduction is a reduction of income that is able to be taxed and is commonly a result of expenses, particularly those incurred to produce additional income. Tax deductions are a form of tax incentives, along with exemptions and tax credits. T ...
, variable tax dollars subtracted from gross income
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Itemized deduction, eligible expense that individual taxpayers in the United States can report on their Federal income tax returns
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Standard deduction
Under United States tax law, the standard deduction is a dollar amount that non- itemizers may subtract from their income before income tax (but not other kinds of tax, such as payroll tax) is applied. Taxpayers may choose either itemized deducti ...
, dollar amount that non-itemizers may subtract from their income
Other uses
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English modals of deduction
Epistemic modality is a sub-type of linguistic modality that encompasses knowledge, belief, or credence in a proposition. Epistemic modality is exemplified by the English modals ''may'', ''might'', ''must''. However, it occurs cross-linguisticall ...
, English modal verbs to state how sure somebody is about something.
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Deduction (food stamps)
In the United States, the Supplemental Nutrition Assistance Program (SNAP), formerly known as the Food Stamp Program, is a federal program that provides food-purchasing assistance for low- and no-income people. It is a federal aid program, ad ...
, used in the United States to calculate a household's monthly food stamp benefit goods
See also
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Induction (disambiguation)
{{Disambiguation