standard deduction
The slice of your income the government does not tax at all.
A fixed statutory reduction of gross income, taken before rates are applied.
What that means in practice
Before any tax is worked out, a fixed amount of your income is set aside and ignored. That is the standard deduction. You do not apply for it and you do not need receipts — it is simply taken off first. Its size depends on how you file: a single person gets one amount, a married couple filing together gets roughly double. Most people take it, because the alternative means proving your actual expenses were larger.
The standard deduction reduces gross income to taxable income without substantiation, in lieu of itemizing. Its amount varies by filing status and is indexed annually. A taxpayer elects the greater of the standard deduction or total itemized deductions; the great majority take the standard, and the share doing so rose sharply after the 2017 increase. ⚠️ It reduces taxable income rather than tax owed — its value to a taxpayer is therefore the amount multiplied by their marginal rate, not the amount itself.
Questions people ask
Who decides this — the federal government or my state?
Each level sets its own. standard deduction federally and standard deduction in your state are separate rules. They just share a label. That is why the two returns rarely agree.
Do I need to understand other terms before this one makes sense?
This one does not stand alone. Several related terms are linked below. standard deduction is easier to hold once they are in place.
Is this the standard name for it?
This one has a single accepted name. That makes it easier to look up than much of the vocabulary around it.
Why is this one harder to pin down than the others?
It has edges. standard deduction changes with circumstances. So the honest explanation runs longer than a definition usually would, and a short answer tends to be wrong in some case.
At which level of government is this determined?
Income tax concepts are defined independently at federal and state level. States may conform to the federal definition, conform selectively, or define their own; conformity is legislated and can be static (tied to a fixed date) or rolling. ⚠️ A federal change therefore propagates to some states automatically and to others only by subsequent state action.
What conceptual dependencies does this term carry?
This term has multiple conceptual dependencies, enumerated in the related-terms list. Definitions in tax law are frequently mutually referential — a provision's meaning depends on defined terms elsewhere in the code — so isolated reading commonly produces error.
Is this designation the settled one?
This designation is the settled term of art with limited alternative usage, so it maps reliably to statutory and agency references. Terms with multiple colloquial designations require more care when searching source material.
Why does this term require extended treatment?
This provision carries conditional application — its effect depends on filing status, income level, timing or jurisdiction — so a single-sentence definition necessarily omits determinative conditions. The extended treatment on this page states them explicitly rather than compressing them away.