Before any federal bracket applies, most filers subtract a standard deduction from their income. That one subtraction is why a salary and taxable income are different numbers, and why a small change in filing status can change a paycheck estimate more than a small change in salary.
The calculator applies the standard deduction for your filing status before it calculates federal tax. This guide explains that step on its own.
What the standard deduction is, in plain terms
The standard deduction is a fixed amount the tax system lets you subtract from income before federal tax is calculated. You do not need receipts for it, and you do not need to list individual deductions to claim it. If your itemized deductions, such as mortgage interest, state and local taxes within their limit, and charitable gifts, add up to more than the standard deduction, itemizing can give a larger subtraction. If they do not, the standard deduction is usually the larger and simpler choice. This guide gives general information only, not a determination for an individual return.
The 2026 amounts
| Filing status | Standard deduction, 2026 |
|---|---|
| Single | $16,100 |
| Married filing jointly | $32,200 |
| Head of household | $24,150 |
| Married filing separately | $16,100 |
Source: IRS Revenue Procedure 2025-32, for tax year 2026. Additional amounts for age 65 or older or blindness are $2,050 for single and head of household filers, and $1,650 per qualifying spouse for joint filers, in the same source. Those additional amounts are not in the paycheck calculator, which uses the base amounts above.
How it changes a simple example
Consider two single filers, one earning $50,000 and one earning $100,000, both with no pre-tax deductions. After the $16,100 standard deduction, their taxable incomes are $33,900 and $83,900. The first filer stays inside the 10 percent and 12 percent brackets. The second filer reaches the 22 percent bracket, but only on the slice above $50,400. Without the deduction, both would look as if they were taxed on $16,100 more income, and the first filer would appear to reach a higher bracket sooner than they actually do.
For a joint filer earning $100,000, the $32,200 deduction leaves $67,800 of taxable income, which sits in the joint 12 percent bracket up to $100,800. Filing status therefore matters as much as salary in this step, because the deduction itself doubles from single to joint.
Standard deduction, state deduction, and pre-tax pay are three different subtractions
Readers often mix up three subtractions that happen in different places. Pre-tax deductions, such as a 401k contribution or a health premium, reduce pay before federal and FICA calculations in a paycheck estimate. The federal standard deduction reduces federal taxable income, but it does not reduce Social Security or Medicare wages in the same way. A state standard deduction, where one exists, reduces state taxable income under that state's rules, and it is a different amount from the federal figure. The paycheck calculator keeps those three separate for that reason, and a state paycheck page shows the state figure for that state.
When the standard deduction is not the whole story
If you itemize, if you have a large mortgage interest amount, or if you are in a state that does not follow the federal standard deduction, the federal figure alone will not reproduce your final return. Arizona, Maine, Maryland, Minnesota, and South Carolina, for example, have state conformity points that differ from the federal figure, and South Carolina in 2026 replaces a conventional standard deduction with its SCIAD deduction. Those are state-return questions, not paycheck-estimate questions, and they are why the calculator is labelled an estimate.
FAQs
Does the standard deduction reduce Social Security tax?
No, in the usual paycheck estimate it reduces federal taxable income, while Social Security and Medicare are calculated on wages after pre-tax deductions, not after the federal standard deduction.
Should I always take the standard deduction?
Not always. If your itemized deductions total more than the standard amount, itemizing can reduce taxable income further. That comparison depends on your own return, not on a paycheck calculator.
Does my filing status change the deduction?
Yes. Joint filers get $32,200 in 2026, head of household $24,150, and single or separate filers $16,100, before any additional amount for age or blindness.