How Does US Federal and State Income Tax Work for Full-Time Employees (2026)

A complete breakdown of federal and state income tax withholding, brackets, and what actually hits your bank account.

By US Payroll & Tax Research Analyst · Published: July 10, 2026 · Updated: July 25, 2026

The Two Levels of Income Tax: Federal and State

The United States has a dual income tax system. The federal government imposes income tax on all US citizens and residents, regardless of which state they live in. Additionally, most states impose their own state income tax. Here's how the two systems work together:

Federal Income Tax

Federal income tax is collected by the Internal Revenue Service (IRS). It's a progressive tax, meaning higher income earners pay a higher percentage of their income in tax. The federal tax system uses seven tax brackets, each with its own rate. For 2026, the brackets are:

Source: IRS Revenue Procedure 2025-40, October 2025. These are the official 2026 federal tax brackets.

State Income Tax

State income tax varies dramatically depending on where you live. As of 2026, eight states have no state income tax at all: Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, and Wyoming. Two more — New Hampshire and Tennessee — only tax certain types of investment income (dividends and interest).

Among states that do tax income, rates range from as low as 2.5% (North Dakota's bottom bracket) to as high as 12.3% (California's top bracket). Some states use a single flat rate, while others use progressive brackets similar to the federal system.

How Withholding Works: The Paycheck Breakdown

When you get a full-time job, your employer withholds several types of taxes from each paycheck. Here's the typical breakdown for a $5,000 monthly gross salary in 2026:

Federal Income Tax Withholding

Federal withholding is calculated using the IRS Percentage Method or Wage Bracket Method, as outlined in IRS Publication 15-T. The amount depends on three factors:

• Your filing status (from your W-4)
• Your pre-tax deductions (401k, health insurance, etc.)
• Your dependents and other withholding adjustments (from your W-4 Step 3)

The IRS updates Publication 15-T annually. For 2026, the agency released updated withholding tables that reflect the new tax brackets and standard deduction amounts.

FICA Tax: Social Security and Medicare

FICA (Federal Insurance Contributions Act) tax funds two critical social programs:

• Social Security: 6.2% on income up to $168,600 (2026 wage base). This pays for retirement benefits, disability insurance, and survivors' benefits.
• Medicare: 1.45% on all income with no cap. An additional 0.9% Medicare surtax applies to individuals earning over $200,000 ($250,000 for married couples).

Your employer pays an equal 7.65% match (except for the additional 0.9% Medicare tax). Self-employed individuals pay both sides — 15.3% total — up to the Social Security wage base.

Your W-4 Form: The Key to Your Withholding

The W-4 form is the document you fill out when starting a new job that tells your employer how much federal income tax to withhold. The IRS redesigned the W-4 in 2020 to align with the new tax bracket system created by the TCJA.

W-4 Steps

2026 W-4 has five steps:

1. Step 1: Personal information — name, SSN, address, filing status
2. Step 2: Multiple jobs or spouse works — affects withholding calculation
3. Step 3: Claim dependents — $2,000 credit per qualifying child, $500 per other dependent
4. Step 4: Other adjustments — other income, deductions, extra withholding
5. Step 5: Sign the form

Filling out Step 3 correctly is important. Each dependent you claim reduces your withholding by $2,000 (for children under 17) or $500 (for other dependents). This directly increases your take-home pay.

The Standard Deduction: Reducing Your Taxable Income

Before federal income tax is calculated, your income is reduced by the standard deduction (or itemized deductions, if you itemize). For 2026, the standard deduction amounts are:

For example, if you're a single employee earning $75,000 per year, your taxable income would be $75,000 minus $14,600 = $60,400. That $60,400 is what gets taxed using the federal brackets.

A Real-World Example

Let's take a single full-time employee earning $85,000 in Austin, Texas (no state income tax) in 2026:

Now we calculate federal income tax on $63,150 using the brackets:

With FICA tax of $6,202 (7.65% of $85,000, all under the $168,600 wage base), total employee-side deductions come to $20,933. Net annual take-home: $64,067, or about $5,339 per month.

Try Our Calculator

You can run your own numbers through the US Take-Home Pay Calculator for any salary, filing status, and state combination.

State Tax Comparison: Same Salary, Different States

The same $85,000 salary in California would look quite different due to state income tax. California has progressive brackets with a top rate of 9.3% (up to 12.3% for very high earners). For $85,000 in California (single filer), state tax would be approximately $4,250 per year — adding about $354 per month in additional withholding.

Compare this to the same salary in Texas, Florida, or Washington — where state tax is $0. That's an instant $354/month difference in take-home pay, or $4,250 per year.

Common Questions About Income Tax for Full-Time Employees