Is There a Cap on FICA Taxes? Social Security vs. Medicare

Yes and no. There is a cap on FICA taxes, but only on the Social Security half. In 2026, the 6.2% Social Security tax stops applying once your wages reach $184,500 for the year.¹ The 1.45% Medicare tax has no ceiling at all and comes out of every dollar you earn.² High earners actually pay more Medicare tax above certain thresholds, not less.

The 2026 Social Security Wage Base

The ceiling on Social Security tax is called the contribution and benefit base, or more commonly the wage base. For 2026 it is $184,500.¹ Wages you earn above that figure in a single calendar year are not subject to the 6.2% Social Security withholding.³ Your employer pays a matching 6.2% on the same capped amount and then stops as well.⁴

If your 2026 earnings reach the cap, the most you and your employer will each contribute to Social Security is $11,439.¹ Once your year-to-date pay crosses $184,500, your paycheck stops showing the 6.2% deduction for the rest of the year. The counter resets on January 1, so withholding starts over each year regardless of what you earned before.

The wage base usually rises each year because it is tied to national average wages. It was $168,600 in 2024 and $176,100 in 2025 before moving to $184,500 in 2026.¹ The statute does not set a fixed dollar amount; it points to a formula in the Social Security Act, and the Social Security Administration announces the new figure each fall.⁵

Medicare Tax Has No Cap

The Medicare portion of FICA works differently. You pay 1.45% on every dollar of wages, and your employer matches that 1.45% no matter how much you earn.² Earn $500,000 in a year and the 1.45% Medicare tax applies to the full $500,000, while the Social Security tax stops at $184,500.

The Extra 0.9% for High Earners

Above certain wage levels, an Additional Medicare Tax of 0.9% is added on top of the standard 1.45%. The thresholds depend on your filing status:²

Single or head of household: $200,000
Married filing jointly: $250,000
Married filing separately: $125,000

These thresholds are written into the statute and are not indexed for inflation, so they have not moved since the tax took effect in 2013.⁶

Your employer only sees what it pays you. It has no way to know your filing status or your spouse’s earnings, so it is required to start withholding the extra 0.9% once your wages from that one job pass $200,000 in the calendar year, whatever your actual filing situation looks like.⁷ If you file jointly and your household wages stay under $250,000, any over-withheld amount comes back to you as a credit on your return. If you file separately with a $125,000 threshold, you may owe more at filing time than your employer withheld.

If You Are Self-Employed

Working for yourself means paying both halves. Under the Self-Employment Contributions Act, the combined Social Security rate is 12.4% and the combined Medicare rate is 2.9%, for a headline rate of 15.3%.⁸ The same $184,500 wage base applies. Once your net self-employment earnings hit that figure, the 12.4% Social Security portion stops for the rest of the year.¹ The 2.9% Medicare portion keeps applying to every additional dollar of profit.

Before applying the cap, you multiply your net profit by 92.35% to get the amount actually subject to self-employment tax.⁹ You can also deduct the employer-equivalent half of your self-employment tax when computing adjusted gross income; that reduces your income tax but does not change the wage base.¹⁰

Two Jobs and Excess Social Security Withholding

The cap is annual and per person, not per employer. Each employer withholds 6.2% on wages up to $184,500 without knowing what any other employer is paying you. If you worked for more than one company during the year and your combined wages topped the cap, more than $11,439 in Social Security tax may have come out of your paychecks. That excess is refundable.¹¹

Add up Box 4 (Social Security tax withheld) from every W-2 you received. If the total is more than $11,439, report the difference on the “Excess social security and tier 1 RRTA tax withheld” line of Schedule 3 with your Form 1040. It works as a refundable credit, cutting your tax bill or increasing your refund.¹¹

This credit is only for over-withholding caused by having multiple employers. If a single employer withheld too much on its own, you cannot claim it on your return. That employer has to correct the error and refund you directly, and if it refuses you can ask the IRS for a refund on Form 843.¹¹ Married couples filing jointly calculate the credit separately for each spouse; you cannot combine W-2 totals.

The 3.8% Investment Surtax Is a Separate Tax

A 3.8% tax on net investment income is sometimes called the Medicare surtax and often gets grouped with FICA, but it is not FICA. It applies to investment income such as interest, dividends, capital gains, and rental income when modified adjusted gross income exceeds $200,000 (single) or $250,000 (married filing jointly).¹² It is not split with an employer and does not touch wages or self-employment earnings, so the FICA cap has nothing to do with it.¹³

1
Social Security Administration. Contribution and Benefit Base
2
Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax
3
Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax
4
Office of the Law Revision Counsel. 26 USC 3111 – Rate of Tax
5
Office of the Law Revision Counsel. 26 USC 3121 – Definitions
6
Internal Revenue Service. Topic No. 560, Additional Medicare Tax
7
Internal Revenue Service. Questions and Answers for the Additional Medicare Tax
8
Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax
9
Internal Revenue Service. Topic No. 554, Self-Employment Tax
10
Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
11
Internal Revenue Service. Topic No. 608, Excess Social Security and RRTA Tax Withheld
12
Office of the Law Revision Counsel. 26 USC 1411 – Imposition of Tax
13
Internal Revenue Service. Questions and Answers on the Net Investment Income Tax