How much Social Security tax is withheld from your paycheck is set by a flat rate: 6.2 percent of your gross wages. Your employer takes that 6.2 percent out of every check and pays a matching 6.2 percent from its own funds, so a combined 12.4 percent goes to the federal government on your behalf. In 2026, withholding applies only to the first $184,500 you earn; anything above that in the same calendar year is not subject to the tax. If you’re self-employed, you owe the full 12.4 percent yourself.
Calculating What Comes Out of a Paycheck
Multiply your gross pay for the period by 0.062. Earn $3,000 in a biweekly period and $186 is withheld for Social Security; your employer sends another $186 alongside it. Gross pay for this purpose includes base salary, hourly wages, commissions, bonuses, and most other compensation. Employer contributions to qualified retirement plans and certain disability or health benefits are excluded.
You can check the year-to-date figure on any pay stub. At the end of the year, the total appears in Box 4 of your W-2, labeled “Social security tax withheld.” For 2026, that number should never exceed $11,439, which is 6.2 percent of the $184,500 wage base.1Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3
Tips count as wages. If you earn $20 or more in cash tips in a calendar month, you’re required to report them to your employer, who then withholds Social Security and Medicare on those tips the same way it does on your hourly pay.2Internal Revenue Service. Tip Recordkeeping and Reporting
The 2026 Wage Base and When Withholding Stops
Only the first $184,500 you earn in 2026 is subject to Social Security tax. Once your year-to-date wages cross that amount, your employer stops withholding the 6.2 percent for the rest of the calendar year, and you’ll see your take-home pay tick up in that pay period.3Social Security Administration. Contribution and Benefit Base
The wage base is recalculated each year by the Social Security Administration based on changes in the national average wage index, so it usually rises. The 2026 figure is up from $176,100 in 2025.4Social Security Administration. Social Security Announces 2.8 Percent Benefit Increase for 2026 The 6.2 percent rate itself is set by statute and does not change annually.5Office of the Law Revision Counsel. 26 USC Chapter 21 – Federal Insurance Contributions Act
If You Have Two Jobs or Too Much Was Withheld
The $184,500 cap is per worker, not per employer. Each employer withholds 6.2 percent independently and doesn’t know what any other employer has already taken. If your combined wages from two or more jobs push past the cap, more Social Security tax will be withheld than you actually owe. You claim the excess back as a credit on your federal income tax return, using the IRS instructions for Form 1040 under “Excess Social Security and tier 1 RRTA tax withheld.”6Internal Revenue Service. Topic No. 608, Excess Social Security and RRTA Tax Withheld
The credit only works when more than one employer is involved. If a single employer over-withheld, you can’t take the credit on your return. Ask the employer to correct it, and if they won’t, file Form 843 (Claim for Refund and Request for Abatement) directly with the IRS.6Internal Revenue Service. Topic No. 608, Excess Social Security and RRTA Tax Withheld On a joint return, each spouse calculates any excess separately; you can’t combine wages.
The Medicare Line Next to It
Your stub also shows a Medicare deduction: 1.45 percent from you and 1.45 percent from your employer. Medicare has no wage base limit, so every dollar you earn is taxed at 1.45 percent no matter how high your income goes.7Internal Revenue Service. Household Employer’s Tax Guide Combined, the total FICA deduction from a paycheck is 7.65 percent (6.2 percent Social Security plus 1.45 percent Medicare), which is the figure most people see.
An additional 0.9 percent Medicare surtax applies to higher earners. Employers start withholding it once they’ve paid you more than $200,000 in a calendar year, regardless of your filing status. The thresholds for actually owing the tax on your return are:
- Single or head of household: $200,000
- Married filing jointly: $250,000
- Married filing separately: $125,0008Internal Revenue Service. Questions and Answers for the Additional Medicare Tax
Because employers use the flat $200,000 trigger, married couples filing jointly who each earn under $200,000 but together clear $250,000 may owe additional tax at filing time. Someone married filing separately can owe it on earnings above $125,000 even though the employer didn’t start withholding until $200,000.
If You’re Self-Employed
When you work for yourself, there’s no employer to split the bill, so you owe the full 12.4 percent Social Security tax on your net self-employment earnings.9Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax This kicks in once your net earnings reach $400 for the year.10Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
One adjustment works in your favor. You don’t apply the 12.4 percent to your full net profit. First multiply net earnings by 92.35 percent, then apply the tax rate to that reduced amount. This mirrors the fact that employees don’t pay FICA on the employer’s share.11Internal Revenue Service. Topic No. 554, Self-Employment Tax
A quick example: with $100,000 in Schedule C net profit, you’d multiply by 0.9235 to get $92,350 in taxable self-employment earnings. The Social Security portion is $92,350 × 0.124 = $11,451.40. Add the Medicare portion ($92,350 × 0.029 = $2,678.15) for a total self-employment tax of $14,129.55, reported on Schedule SE with your Form 1040. You can also deduct half of your total self-employment tax when calculating adjusted gross income, which reduces your income tax but not the self-employment tax itself.10Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
The $184,500 wage base applies to self-employed people too. If you also have a W-2 job, wages from that job count first toward the cap, and you only owe the 12.4 percent Social Security portion of self-employment tax on the remaining room under the limit.3Social Security Administration. Contribution and Benefit Base
Without an employer withholding for you, self-employment income generally means quarterly estimated tax payments. The 2026 deadlines are April 15, 2026; June 15, 2026; September 15, 2026; and January 15, 2027.12Internal Revenue Service. 2026 Form 1040-ES You can skip the January payment if you file your 2026 return and pay the full balance by February 1, 2027. Missing a deadline can trigger underpayment penalties based on how late each installment was and how much was underpaid.
Who Doesn’t Pay Social Security Tax
Most workers pay, but a few narrow exemptions exist. Students employed by the school, college, or university where they are actively enrolled can be exempt from FICA withholding when the relationship with the institution is primarily educational rather than primarily employment. A full-time student working part-time on campus typically qualifies; a full-time employee who happens to take a class generally does not.13Internal Revenue Service. Student Exception to FICA Tax
Nonresident aliens on certain visas also qualify. International students on F-1, J-1, M-1, or Q visas are generally exempt for their first five calendar years in the United States, as long as they haven’t passed the substantial presence test. Scholars, teachers, and researchers on J-1 visas who are not students are exempt for their first two calendar years. Certain members of religious groups conscientiously opposed to accepting insurance benefits may apply for an exemption by filing Form 4029. Some state and local government employees covered by a qualifying public retirement system may be exempt as well, depending on their plan.
If Your Pay Stub Shows No Social Security Withheld
Employer noncompliance is the employer’s problem in terms of penalties, not yours: Social Security still credits your earnings record based on what was reported on your W-2 even if the employer fails to deposit the tax. But that noncompliance can create complications down the road, so if your stub shows no Social Security deduction and you’re not in one of the exempt categories above, raise it with your payroll department right away.