Social Security Tax Calculator: How FICA Works and What You Actually Pay

If you look at your pay stub, you will see a line for “Social Security” or “OASDI” being deducted from every paycheck. Most employees give it a glance and move on. But understanding exactly how Social Security tax works — who pays it, how much, and when it stops each year — helps you plan your take-home income and your retirement strategy.

Use our Paycheck Calculator to see exactly how FICA affects your net pay at any income level.

The Basics: What Is FICA?

FICA stands for Federal Insurance Contributions Act. It funds two programs:

• Social Security (OASDI — Old Age, Survivors, and Disability Insurance)
• Medicare (Hospital Insurance)

Both the employee and employer pay FICA. As an employee, it is split as follows:

Tax	Employee Rate	Employer Rate	Combined
Social Security	6.2%	6.2%	12.4%
Medicare	1.45%	1.45%	2.9%
Total FICA	7.65%	7.65%	15.3%

The 2026 Social Security Wage Base: $176,100

Social Security tax applies only to wages up to the wage base limit, which is $176,100 in 2026. Earnings above this cap are not subject to the 6.2% Social Security tax.

Medicare tax has no wage base cap — you pay 1.45% on every dollar you earn.

Maximum Social Security Tax in 2026

The most any employee will pay in Social Security tax in 2026:

• $176,100 × 6.2% = $10,918.20

Employers pay the same matching amount. Total Social Security contribution at the wage base: $21,836.40.

When Does Social Security Tax Stop Each Year?

Social Security tax stops when your year-to-date wages reach $176,100. For high earners, this can happen partway through the year.

Annual Salary	Month SS Tax Stops
$176,100	December (end of year)
$200,000	October
$250,000	August
$352,200	June (halfway through year)
$500,000	Late April
$700,000+	March or earlier

When SS tax stops, high earners see a noticeable boost in their take-home pay. A $250,000 earner gets roughly $915/month extra ($176,100 × 6.2% ÷ remaining months) in the months after hitting the cap.

FICA Tax by Income Level

Annual Salary	SS Tax (6.2%)	Medicare (1.45%)	Total FICA	Take-Home Impact
$30,000	$1,860	$435	$2,295	$191/month
$50,000	$3,100	$725	$3,825	$319/month
$75,000	$4,650	$1,088	$5,738	$478/month
$100,000	$6,200	$1,450	$7,650	$638/month
$150,000	$9,300	$2,175	$11,475	$956/month
$176,100 (cap)	$10,918	$2,553	$13,472	$1,123/month
$200,000	$10,918	$2,900	$13,818	$1,152/month

Note: At $200K, SS tax is capped but Medicare continues. Additional Medicare Tax of 0.9% kicks in on wages above $200K (single) / $250K (married).

The Additional Medicare Tax

High earners face an extra 0.9% Medicare tax on wages above:

• $200,000 for single filers and head of household
• $250,000 for married filing jointly
• $125,000 for married filing separately

This is not matched by employers — it is purely an employee obligation. Your employer withholds it when your wages exceed $200,000 from that employer, but you may owe more or less when you file your tax return depending on your filing status and total household income.

Self-Employment Tax: Paying Both Sides

If you are self-employed, you are both employer and employee — so you pay the full 15.3% self-employment (SE) tax on net self-employment income up to $176,100:

Net SE Income	SE Tax (15.3%)
$30,000	$4,590
$50,000	$7,650
$80,000	$12,240
$100,000	$15,300
$176,100 (cap)	$26,961

The deduction cushion: You can deduct half of SE tax from your gross income on Schedule 1 of your Form 1040. This offsets the fact that employees get the employer’s half as a business expense automatically.

How Social Security Benefits Are Calculated

Your eventual Social Security benefit is based on your 35 highest-earning years. Each year’s earnings are indexed for wage inflation, then averaged. The benefit formula is progressive — lower earners get a higher percentage of their earnings replaced.

Checking your earnings record matters: errors occur when employers misreport wages. Even a missing year can reduce your eventual benefit.

To check your record: Go to ssa.gov/myaccount and review your Social Security Statement. If you find an error, contact the SSA with your W-2s as documentation.

FICA and Retirement Planning

Social Security is not meant to be your only retirement income. The average benefit in 2026 is approximately $1,900/month ($22,800/year) — less than many retirees need to cover basic expenses.

The 401(k) limits covered in our 401k contribution limits guide are the primary supplement. Use our Compound Interest Calculator to model how much you need to save to supplement Social Security at your target retirement age.

See your complete FICA breakdown on every paycheck with our Paycheck Calculator.