Federal vs State Income Tax: What's Actually Taken from Your Paycheck

Most workers know their paycheck is smaller than their hourly rate implies — but few know exactly why. This guide breaks down every deduction that appears on a US paycheck: federal income tax, Social Security, Medicare, state income tax, and others — with real examples for three income levels.

The Five Major Paycheck Deductions

A typical US paycheck has five categories of deductions:

1. Federal income tax — the largest and most variable deduction
2. Social Security tax — 6.2% of gross wages, up to $184,500
3. Medicare tax — 1.45% of all gross wages (no cap)
4. State income tax — 0% to 13.3% depending on state
5. Voluntary deductions — 401(k), health insurance, FSA, HSA

Items 2 and 3 together are commonly called FICA (Federal Insurance Contributions Act) taxes. They're non-negotiable — everyone who earns wages pays them, regardless of filing status or income level (below the SS wage cap).

Federal Income Tax: How the Brackets Work

The US uses a progressive tax system, meaning higher income is taxed at higher rates — but only the dollars within each bracket are taxed at that bracket's rate. Your "tax bracket" refers to your highest marginal rate, not the rate applied to all your income.

Example: A single filer earning $60,000 does not pay 22% on the full $60,000. After the $16,100 standard deduction, taxable income is $43,900. They pay: 10% on the first $12,400 ($1,240) + 12% on the next $31,500 ($3,780) = $5,020 total federal income tax. Their effective federal rate is 8.4% of gross pay — not 22%.

FICA: Social Security and Medicare

FICA taxes are flat rates applied to all earned income, with no deductions or credits:

• Social Security: 6.2% on wages up to $184,500 (2026 wage base). Your employer matches this 6.2%, contributing an additional 6.2% that you never see. Self-employed individuals pay both halves — 12.4% total.
• Medicare: 1.45% on all wages, with no cap. An additional 0.9% Medicare surtax applies to wages above $200,000 (single filers). Employers match the base 1.45% but not the surtax.

Combined employee FICA rate: 7.65% for most workers. This is the same regardless of your state, your filing status, or your deductions.

State Income Tax: The Wild Card

State income tax varies enormously. Nine states have no state income tax at all; several others have rates above 9%. This dramatically affects your real take-home pay.

Real-World Paycheck Examples

Here's how these taxes interact across three income levels for a single filer in Texas (no state tax) versus California:

At $100,000, the Texas–California gap is nearly $9,300/year. Over a 10-year career, that's $93,000 in additional after-tax income — enough to fund a significant portion of a home down payment or retirement savings.

The Standard Deduction vs. Itemizing

Before federal income tax is calculated, you reduce your gross income by either the standard deduction or your itemized deductions — whichever is higher.

• Standard deduction (2026): $16,100 for single filers, $32,200 for married filing jointly. This is a flat reduction with no documentation required.
• Itemized deductions: The sum of specific deductible expenses — mortgage interest, state and local taxes (SALT, capped at $40,400 for most filers in 2026 under the One Big Beautiful Bill Act, phasing down toward $10,000 for very high earners), charitable contributions, medical expenses above 7.5% of AGI, and others.

Since the 2017 Tax Cuts and Jobs Act doubled the standard deduction, roughly 87% of US taxpayers now take the standard deduction. Itemizing only makes sense if your qualifying expenses exceed $16,100 (single) — which typically requires significant mortgage interest, very high SALT payments, or large charitable giving.

W-4 and Withholding: Why Your Paycheck Amount Changes

Your employer uses your W-4 form to determine how much federal income tax to withhold from each paycheck. If your withholding is too high, you get a large refund at tax time (an interest-free loan to the government). If it's too low, you owe at filing and may face an underpayment penalty.

Common reasons take-home pay changes mid-year:

• You update your W-4 (adding or removing dependents, claiming additional withholding)
• Your income changes significantly (a raise, a second job, or unemployment)
• You hit the Social Security wage base cap ($184,500) — Social Security withholding stops, increasing your paycheck
• Your employer's health insurance premium changes at annual enrollment

Pre-Tax vs Post-Tax Deductions

Not all paycheck deductions are equal — some reduce your taxable income (pre-tax), others do not (post-tax):

• Pre-tax (reduce taxable income): Traditional 401(k) contributions, health insurance premiums (employer-sponsored), HSA contributions, FSA contributions, commuter benefits. Contributing to these reduces your federal and state income tax.
• Post-tax (do not reduce taxable income): Roth 401(k) contributions, union dues, wage garnishments, charitable payroll deductions. These come out after taxes are calculated.

Maximizing pre-tax contributions is one of the most accessible tax-reduction strategies. A worker earning $60,000 who contributes $10,000 to a traditional 401(k) reduces federal taxable income to $35,000 — saving approximately $1,200 in federal tax, $500 in state tax (varies), and building retirement wealth simultaneously.

Calculate Your Exact Take-Home Pay

The interaction of federal brackets, FICA, state rates, and deductions makes it impossible to give a single answer for "how much of my paycheck goes to taxes." Use our Salary Calculator to enter your exact salary and state for a precise estimate.