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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesYour paycheck may list federal income tax, Social Security and Medicare as separate deductions. They are not all calculated the same way: federal income tax withholding depends on your Form W-4 and IRS withholding methods, while Social Security and Medicare are payroll taxes with statutory rates and rules. Check the labels on your pay stub to see which amount you mean by “federal withholding.”
What federal taxes can appear on your paycheck?
Federal income tax withholding is an advance payment toward your federal income tax bill. Social Security and Medicare taxes are commonly grouped together as FICA. Employees pay their share of FICA through payroll deductions, and employers generally pay a matching share of regular Social Security and Medicare taxes.
These lines serve different purposes and follow different rules. A change to your Form W-4 affects federal income tax withholding; it does not change the Social Security or Medicare tax rates.
2026 Social Security and Medicare withholding rates
| Paycheck tax | Employee share in 2026 | Employer share | Wage limit |
|---|---|---|---|
| Social Security | 6.2% of covered wages | 6.2% of covered wages | $184,500 wage base for 2026 |
| Regular Medicare | 1.45% of covered wages | 1.45% of covered wages | No wage base limit |
| Additional Medicare Tax | 0.9% on wages subject to withholding after the employer-paid wages exceed $200,000 in the calendar year | No matching share | $200,000 employer withholding threshold |
The rates and limits in the table are 2026 figures from the IRS Topic 751 and IRS Publication 15. They describe general employee withholding rules; special employment categories and exemptions can have different treatment.
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Social Security stops at the annual wage base
For 2026, the employee Social Security rate is 6.2% on covered wages up to $184,500. Once your wages reach that annual wage base, your employer generally stops withholding Social Security tax from additional wages for the rest of the year. The wage base applies to each employer’s payroll calculations; if you have more than one employer during the year, the combined withholding may exceed the maximum Social Security tax for the year. Any excess may generally be claimed as a credit on your federal income tax return.
Regular Medicare has no wage cap
Regular Medicare withholding is 1.45% of covered wages, with no wage base limit. Your employer generally withholds it throughout the year, even after your Social Security withholding has stopped.
Additional Medicare withholding begins above $200,000 per employer
An employer must begin withholding Additional Medicare Tax at 0.9% from wages it pays you after those wages exceed $200,000 in the calendar year. The employer applies that threshold without regard to your filing status and begins withholding in the pay period that takes your wages over it. The employer does not match this additional 0.9%.
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The $200,000 figure is the employer’s withholding trigger, not a determination of your final tax liability. Your final Additional Medicare Tax depends on your circumstances and is reconciled on your tax return.
How federal income tax withholding is calculated
Federal income tax withholding is not one flat percentage for every employee. Employers use your Form W-4 information together with taxable pay, pay frequency and IRS withholding procedures and tables. The IRS updates its guidance for tax-law changes; its 2026 Publication 15-T explains the withholding methods and tables employers use.
Because the income tax line is a prepayment rather than a fixed payroll-tax rate, its amount can differ between employees with similar gross pay. W-4 entries, multiple jobs and other information relevant to withholding can affect the calculation.
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How to review or change federal income tax withholding
- Check the pay-stub labels. Identify the federal income tax line separately from Social Security and Medicare. A W-4 change is for federal income tax withholding, not FICA.
- Use the IRS Tax Withholding Estimator. The free IRS estimator compares estimated tax with current withholding and can help you decide whether a change is appropriate. It can be especially useful if you have multiple jobs, worked only part of the year, or receive dividends, capital gains, Social Security, bonuses or business income.
- Submit an updated Form W-4 to your employer if you decide to adjust withholding. The current Form W-4 has five steps. Employees generally complete Step 1 and sign Step 5; complete Steps 2–4 when they apply to your situation.
Form W-4 versions for 2020 and later do not use the former withholding-allowance system. Follow the current form rather than trying to claim allowances.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why a deduction may change or stop
Social Security stopped, but Medicare continues
This can happen when your wages from an employer reach the 2026 Social Security wage base of $184,500. Regular Medicare has no wage cap, so it generally continues on covered wages.
Additional Medicare Tax appeared later in the year
An employer begins withholding the additional 0.9% after it pays you more than $200,000 in wages during that calendar year. The employer’s threshold is applied without regard to filing status.
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Federal income tax withholding looks unexpectedly high or low
Review your W-4 entries and consider using the IRS estimator, particularly if you have more than one job or income beyond wages. If you make a change, submit an updated W-4 to your employer. Do not use the W-4 to try to change FICA rates.
Which withholding amount can you change?
| Paycheck amount | How it is determined | Can you change it with a W-4? |
|---|---|---|
| Federal income tax withholding | W-4 information, taxable pay and IRS withholding methods | Yes. You can submit an updated W-4 to your employer. |
| Social Security and regular Medicare | Statutory payroll-tax rates and applicable wage rules | No. A W-4 does not change these rates or rules. |
| Additional Medicare withholding | 0.9% employer withholding after the employer-paid wage threshold is crossed | No. A W-4 does not change the withholding trigger or rate. |
The distinction matters when diagnosing a paycheck. If your federal income tax prepayment seems wrong, review your W-4 and estimated tax. If a Social Security or Medicare line changes, the relevant explanation is generally the statutory rate or wage rule, not your W-4.
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