Definition
The flat amount every filer can subtract from income before tax, no receipts required. Most Americans take it rather than itemizing; the IRS adjusts it annually.
Why it matters
The standard deduction is why most filers no longer itemize and why common advice about deducting mortgage interest or donations often does not apply: those only matter once they beat the flat amount.
Example
A couple's mortgage interest and donations total less than the standard deduction, so they take the flat deduction and skip the receipts. Their neighbor with a large mortgage and big charitable gifts itemizes because the total exceeds it.
Related terms
This definition is educational, not financial, legal, or tax advice. U.S. rules and limits change; verify time-sensitive details with official sources. See our disclaimer.