How Payroll Taxes Work: FICA, Social Security & Medicare Explained

What Are Payroll Taxes?

Payroll taxes are mandatory taxes levied on wages and salaries to fund specific government programs. Unlike federal income tax, which goes into the government's general fund, payroll taxes are earmarked for Social Security (retirement, disability, and survivors benefits) and Medicare (healthcare for Americans 65 and older).

Every time you receive a paycheck, you will see line items for Social Security and Medicare deductions. Combined, these are commonly referred to as FICA taxes, named after the Federal Insurance Contributions Act of 1935 that established the system. Your employer withholds these amounts automatically and remits them to the IRS along with a matching employer contribution.

For most American workers, payroll taxes represent the second-largest tax burden after federal income tax. A worker earning $60,000 pays $4,590 in FICA taxes alone, with their employer paying an additional $4,590 on their behalf. Understanding these taxes is essential for accurate budgeting, evaluating total compensation, and planning for retirement.

Our Paycheck Calculator breaks down exactly how much FICA and other taxes are deducted from each paycheck based on your salary, pay frequency, and filing status.

FICA Tax Breakdown: 2026 Rates

FICA tax consists of two separate taxes that fund two separate programs. Here are the current rates and how the cost is split between employer and employee:

The total combined rate of 15.3% is significant. On a $70,000 salary, the total FICA contribution is $10,710, split evenly at $5,355 each between employee and employer. While you only see the employee portion on your pay stub, the employer's share is a real cost of employing you that reduces the amount available for your salary.

Use our Salary Calculator to see the full picture of how FICA taxes reduce your gross salary to net take-home pay.

Social Security Tax: The Wage Base Cap

Social Security tax has a critical feature that distinguishes it from Medicare: the wage base limit. In 2026, Social Security tax only applies to the first $168,600 of wages. Once your cumulative earnings for the year exceed this threshold, no additional Social Security tax is withheld from your paychecks for the remainder of the year.

This cap means the maximum Social Security tax an employee pays in 2026 is $10,453.20 (6.2% of $168,600). For high earners, this creates a noticeable bump in take-home pay mid-year. Someone earning $200,000 would stop paying Social Security tax around late October, resulting in larger paychecks for November and December.

The wage base increases most years with inflation and wage growth. This means more of your income becomes subject to Social Security tax over time. About 6% of workers earn above the wage base and benefit from the cap.

If you earn above the wage base, our Net Pay Calculator accounts for the Social Security cap when calculating your monthly and annual take-home pay.

Medicare Tax: No Cap, Plus a Surtax

Unlike Social Security, Medicare tax has no wage base limit. Every dollar you earn is subject to the 1.45% Medicare tax, regardless of how much you make. This means a worker earning $500,000 pays Medicare tax on the entire amount, totaling $7,250 for the base rate alone.

Since 2013, the Affordable Care Act introduced an Additional Medicare Tax (often called the Medicare surtax) of 0.9% on wages exceeding specific thresholds. This surtax is paid only by the employee; employers do not match it.

For a single filer earning $250,000, the Medicare tax calculation works like this: 1.45% on all $250,000 ($3,625) plus 0.9% on the $50,000 above the $200,000 threshold ($450), for a total employee Medicare tax of $4,075. The employer still pays only the flat 1.45% ($3,625).

Important note: employers are required to start withholding the additional 0.9% once wages exceed $200,000, regardless of filing status. If you are married filing jointly with a $250,000 threshold but only earn $210,000, your employer will withhold the surtax on $10,000. You may need to reconcile this on your tax return.

Employer Payroll Tax Obligations

Employees see their half of FICA on their pay stubs, but employers carry a substantial additional tax burden that is invisible to workers. Understanding the full employer cost helps you appreciate your total compensation value.

Employer FICA Match

Employers pay an identical 7.65% in FICA taxes on every dollar of wages (up to the Social Security wage base for the 6.2% portion). On a $75,000 salary, the employer pays $5,737.50 in matching FICA taxes. This cost is on top of the salary and all other benefits provided to the employee.

Federal Unemployment Tax (FUTA)

Employers also pay the Federal Unemployment Tax at 6.0% on the first $7,000 of each employee's annual wages. However, employers who pay state unemployment taxes on time receive a credit of up to 5.4%, reducing the effective FUTA rate to just 0.6%. This means the maximum FUTA per employee is typically $42 per year (0.6% of $7,000). FUTA funds the federal unemployment insurance program.

State Unemployment Tax (SUTA)

Every state charges employers a State Unemployment Tax on a portion of employee wages. Rates vary dramatically by state and by the employer's claims history (experience rating). New employers typically pay a standard rate of 2-4%, while employers with many layoffs can face rates of 5-12%. The taxable wage base ranges from $7,000 (same as FUTA) in states like Arizona and California to over $50,000 in states like Washington.

When you factor in employer payroll taxes plus benefits (health insurance, 401k match, PTO), the true cost to employ someone earning $75,000 is typically $95,000-$110,000. This is why understanding total compensation matters when evaluating offers. Try our Salary to Hourly Converter to see what your compensation translates to on an hourly basis.

Self-Employment Tax: Paying Both Sides

Self-employed individuals, freelancers, and independent contractors do not have an employer to split FICA with. Instead, they pay the full 15.3% self-employment (SE) tax on net self-employment income. This is calculated on Schedule SE and filed with Form 1040.

The SE tax calculation has an important nuance: it is computed on 92.35% of net self-employment earnings (not 100%). This adjustment accounts for the fact that employers do not pay FICA on the employer portion of FICA, and the IRS extends the same treatment to self-employed individuals. On $100,000 of net self-employment income, the SE tax base is $92,350, resulting in $14,130 in self-employment tax.

To provide partial relief, self-employed individuals can deduct 50% of their SE tax when calculating adjusted gross income (AGI). This deduction is taken on Form 1040, not on Schedule C. For our $100,000 earner paying $14,130 in SE tax, the deduction would be $7,065, reducing their AGI and federal income tax.

Our Contract vs Full-Time Calculator automatically computes self-employment tax and compares it against W-2 FICA withholding to give you a true apples-to-apples comparison.

How Payroll Taxes Affect Your Paycheck

Let us walk through a concrete example of how payroll taxes reduce a biweekly paycheck. Consider a single filer earning $65,000 per year, paid every two weeks (26 pay periods).

In this example, FICA taxes consume 7.65% of every paycheck, or $191.25 biweekly. Over the full year, that is $4,972.50 in FICA taxes from the employee side alone. The employer pays an identical $4,972.50, meaning the total Social Security and Medicare contribution on this salary is $9,945.

For workers earning above the Social Security wage base ($168,600), the biweekly Social Security deduction stops once cumulative wages exceed the cap. A worker earning $200,000 would stop paying Social Security tax after approximately 22 pay periods, seeing an increase of about $481 per biweekly paycheck for the final 4 periods of the year. Use our Overtime Calculator to see how overtime earnings affect your FICA obligations.

Common Payroll Tax Mistakes to Avoid

Both employers and employees frequently make payroll tax errors that can lead to penalties, underpayment, or overpayment. Here are the most common mistakes and how to avoid them:

Employee Mistakes

• Confusing marginal and effective rates: FICA is a flat percentage, but federal income tax uses progressive brackets. Your effective rate is always lower than your marginal bracket.
• Ignoring the wage base cap: If you have multiple jobs, each employer withholds Social Security independently. You could overpay if combined wages exceed $168,600. Claim the excess on your tax return.
• Overlooking the Medicare surtax: The additional 0.9% catches high earners by surprise. If married filing jointly, your employer starts withholding at $200K, but the threshold is $250K, requiring reconciliation at tax time.
• Not adjusting W-4 after life changes: Marriage, divorce, new dependents, and job changes all affect optimal withholding. Review your W-4 annually.

Employer Mistakes

• Late deposits: Payroll taxes must be deposited on schedule (monthly or semi-weekly depending on total tax liability). Late deposits trigger escalating penalties from 2% to 15%.
• Worker misclassification: Treating employees as 1099 contractors to avoid payroll taxes is one of the most common and costly mistakes. The IRS actively audits for misclassification.
• Incorrect wage base tracking: Failing to stop Social Security withholding after an employee exceeds the wage base, or not accounting for it when an employee starts mid-year.

Review your pay stubs regularly to catch errors early. Our Raise Calculator helps you understand how a salary increase affects your payroll tax obligations and net pay.

Payroll Taxes vs Income Taxes: Key Differences

Payroll taxes and income taxes are both withheld from your paycheck, but they differ in fundamental ways that affect how much you pay and who bears the burden:

A crucial distinction is that payroll taxes are regressive: they take a larger percentage of income from lower earners than from higher earners because of the Social Security wage cap. Someone earning $50,000 pays 7.65% on every dollar, while someone earning $300,000 pays an effective FICA rate closer to 5.5% because Social Security tax stops at $168,600.

Additionally, payroll taxes cannot be reduced through deductions or credits. Standard deductions, itemized deductions, child tax credits, and other tax breaks only reduce income tax, not payroll taxes. This is why even workers with zero federal income tax liability still see FICA deductions on their pay stubs. Our Salary Inflation Calculator tracks how your purchasing power changes year over year, including the impact of tax rate adjustments.

Frequently Asked Questions