Federal Tax Guide

Federal Taxes at a Glance

The United States uses a progressive federal income tax system with seven brackets for 2026, ranging from 10% to 37%. You pay each rate only on the portion of income that falls within that bracket — not on your entire income. This means your effective (average) tax rate is always lower than your top marginal bracket.

In addition to federal income tax, every paycheck is subject to FICA taxes: 6.2% for Social Security (on wages up to $184,500) and 1.45% for Medicare (on all wages, with no cap). Your employer matches both of these amounts.

Federal income tax withholding is calculated using the IRS Publication 15-T percentage method, based on your W-4 form elections — filing status, credits, additional income, deductions, and any extra withholding you request.

State income taxes are separate and vary by state. See our state-by-state guides for details on your state.

Key Federal Tax Facts for 2026

2026 Federal Income Tax Brackets

Below are the 2026 federal income tax brackets for each filing status. Rates apply to taxable income (after the standard deduction or itemized deductions) within each range — you only pay the higher rate on the portion of income that falls in that bracket.

Single

Married Filing Jointly

Head of Household

Understanding Your W-4

Form W-4 tells your employer how much federal income tax to withhold from each paycheck. The current W-4 (revised 2020) has four main steps:

1. Step 1: Personal Information — Enter your name, address, Social Security number, and filing status (Single, Married Filing Jointly, or Head of Household). Your filing status determines which tax bracket thresholds and standard deduction apply to your withholding calculation.
2. Step 2: Multiple Jobs or Spouse Works — If you hold more than one job at a time, or you're married filing jointly and your spouse also works, check the box in Step 2. This adjusts the withholding formula so you don't under-withhold across multiple income sources. You can also use the IRS Tax Withholding Estimator for more precise guidance.
3. Step 3: Claim Dependents — Enter annual amounts for the Child Tax Credit ($2,000 per qualifying child) and other dependent credits ($500 per other dependent). These credits reduce your per-paycheck federal income tax withholding.
4. Step 4: Other Adjustments (optional) — Three sub-sections allow fine-tuning: 4(a) for other income not from jobs (interest, dividends, retirement) that increases withholding; 4(b) for deductions beyond the standard deduction (like itemized deductions or student loan interest) that decreases withholding; and 4(c) for any extra per-paycheck withholding amount you want taken out.

You can update your W-4 with your employer at any time — there's no limit on how often you can submit a new one. Major life changes (marriage, new child, new job, buying a home) are good triggers to review your withholding.

FICA Taxes: Social Security & Medicare

FICA (Federal Insurance Contributions Act) taxes fund Social Security and Medicare. Unlike income tax, FICA is a flat-rate payroll tax applied to your gross wages — pre-tax deductions like 401(k) and HSA do not reduce FICA-taxable wages in most cases.

Social Security — 6.2%

You pay 6.2% on all wages up to the wage base limit of $184,500 for 2026. Once your year-to-date earnings exceed $184,500, Social Security tax stops being withheld for the remainder of the year. Your employer also pays a matching 6.2%.

Medicare — 1.45%

You pay 1.45% on all wages with no cap. Your employer matches this amount as well.

Additional Medicare Surtax — 0.9%

An additional 0.9% Medicare surtax applies to wages exceeding $200,000 (single/head of household) or $250,000 (married filing jointly). This surtax is paid by the employee only — your employer does not match it. Note that employers are required to begin withholding the additional 0.9% once your wages from that employer exceed $200,000, regardless of your filing status.

How Your Federal Paycheck Is Calculated

Every paycheck goes through the same basic pipeline from gross pay to the net amount that hits your bank account:

1. Gross Pay — Your total earnings for the pay period. For hourly workers this is (hours × rate) plus any overtime (1.5×) or double-time (2×) premiums. For salaried employees it's your annual salary divided by the number of pay periods.
2. Pre-Tax Deductions — Contributions to 401(k), 403(b), HSA, or FSA are subtracted before income taxes are calculated. These lower your taxable wages, but Social Security and Medicare generally still apply to the full gross amount.
3. Federal Income Tax — Withheld using the IRS Publication 15-T percentage method based on your W-4 filing status, Step 2 checkbox, Step 3 credits, Step 4 adjustments, and pay frequency. For 2026, rates range from 10% to 37%.
4. FICA Taxes — Social Security (6.2% on wages up to $184,500) and Medicare (1.45% on all wages, plus 0.9% surtax on wages above $200,000). If your year-to-date earnings exceed the Social Security wage base, that portion stops being withheld.
5. State Income Tax — Varies by state. Some states have no income tax (e.g., Texas, Florida, Washington), others have flat rates, and many have progressive brackets. See our state guides for details.
6. Net Pay (Take-Home) — What's left after all taxes and deductions. This is the amount deposited into your account each pay period.

Common Paycheck Tax Considerations

• Review your W-4 periodically. If you consistently receive a large refund or owe a large amount at filing time, your withholding may not match your actual tax liability. The IRS Tax Withholding Estimator can help you dial in the right amount. Life events like marriage, a new child, or a raise are good triggers to review.
• Benefits of contributing to a 401(k) or 403(b). Pre-tax retirement contributions reduce your federal (and usually state) taxable income for the year. For 2026, the employee contribution limit is $23,500 ($31,000 if age 50+). Even a modest 3%–6% contribution may noticeably lower your tax withholding while building long-term savings.
• Benefits of an HSA if you're eligible. Health Savings Accounts offer a rare triple tax advantage: contributions lower your taxable income now, the balance grows tax-free, and withdrawals for qualified medical expenses are also tax-free. For 2026, HSA contribution limits are $4,300 (individual) and $8,550 (family). Eligibility requires enrollment in a qualifying high-deductible health plan (HDHP).
• Understand marginal vs. effective tax rate. Your marginal rate is the rate on your last dollar of income (your top bracket). Your effective rate is the total tax divided by your total income — it's always lower because earlier dollars are taxed at lower rates. For example, a single filer with $60,000 in taxable income has a 22% marginal rate but an effective federal income tax rate of approximately 13.1%.

Sources

The information in this guide is based on the following official and publicly available sources. Always verify current rates and rules before making financial decisions.

• IRS Publication 15-T (2026) — Federal Income Tax Withholding Methods
• IRS 2026 Tax Inflation Adjustments — Standard Deduction & Marginal Rates
• Social Security Administration — Contribution and Benefit Base
• IRS — About Form W-4, Employee's Withholding Certificate
• IRS Topic No. 751 — Social Security and Medicare Withholding Rates

Explore State Tax Guides