Standard Deduction

What Is a Standard Deduction?

The standard deduction is a fixed dollar amount that lowers the income the United States federal government taxes. Taxpayers who do not itemize can subtract it instead of listing individual expenses such as mortgage interest, state taxes, and charitable gifts. Because it reduces the income subject to tax, it lowers the tax owed for most filers. It is a deduction, not a tax credit, which reduces tax directly.

How It Works

Most filers start with total income and subtract certain adjustments to reach adjusted gross income. They then subtract either the standard deduction or their itemized deductions, whichever is larger. The result is taxable income, which determines tax under the applicable tax bracket rates.

The base amount depends on filing status, such as single, married filing jointly, or head of household. Filers who are age 65 or older, or who are blind, may receive an additional amount. The base figures are adjusted periodically, usually for inflation, so the amounts for a given tax year should be checked against official IRS guidance.

Standard Versus Itemized

Taxpayers generally use whichever method produces the lower tax bill. Itemizing only makes sense when qualifying expenses add up to more than the standard amount. Larger standard amounts in recent years have led many households to stop itemizing altogether.

Suppose a single filer's itemized expenses total less than the standard amount for that year. Taking the standard deduction reduces taxable income more, so it is the better choice in that situation.

Advantages and Disadvantages

The main advantage is simplicity. Filers who take the standard deduction do not need to gather receipts or track individual expenses. The drawback is that people with large deductible costs, such as high medical bills or substantial charitable giving, may receive a bigger benefit by itemizing. Understanding how the two options compare helps investors see how their income, including investment income, is taxed.