You've run your first payroll as a business owner. The gross wages look straightforward, but employees' take-home pay is lower than expected, and a separate employer tax expense appears on your ledger. The line labeled FICA is responsible for part of that difference, but it's easy to misunderstand because it combines two taxes, uses different rules for each, and changes behavior once an employee reaches the Social Security wage base.

For 2026, the headline employee-side rate is 7.65%, but that rate isn't the whole story. Social Security withholding stops after an employee reaches $184,500 in covered wages, while Medicare continues on every covered dollar. That creates a wage-base cliff, a sharp change in the marginal FICA rate that affects paychecks, bonuses, executive compensation, and year-end payroll forecasts.

What FICA Means for Your Paycheck

Suppose your first employee earns a regular salary. On the pay stub, you see deductions for Social Security and Medicare. On your employer report, you see matching amounts that your business must pay. Nothing has gone wrong. You're seeing the two sides of the Federal Insurance Contributions Act, commonly called FICA.

FICA is the federal law that requires payroll taxes to help fund Social Security and Medicare. For a typical W-2 employee, the employer withholds the employee share from wages, and the employer contributes a matching share from business funds. The employee doesn't write a separate check for the withholding, but the deduction reduces take-home pay.

The tax applies to nearly all covered wages, although specific worker and employment categories can have different treatment. It's a payroll obligation, not an optional benefit election, and payroll records need to distinguish the employee withholding from the employer liability.

The two sides of the tax

For ordinary covered wages, the employee pays through withholding and the employer pays a matching amount. In 2026, that standard burden is 7.65% for each side, or 15.3% combined, before any additional Medicare withholding and before Social Security withholding reaches its annual cap, as described by the IRS guidance on Social Security and Medicare taxes.

The employee's portion affects net pay. The employer's portion affects the cost of hiring. If you budget only the stated salary, you'll understate payroll cost.

Self-employed workers face a different collection mechanism under the Self-Employment Contributions Act, or SECA. Because there's no separate employer paying a matching share, the self-employed individual is responsible for both sides of the standard FICA burden. A W-2 employee who also earns freelance income may need to consider both payroll withholding and self-employment obligations.

Practical rule: Treat employee withholding and employer matching contributions as separate ledger items, even though they're based on the same wages.

Understanding that split is the starting point for accurate payroll tax FICA calculations. The more difficult question is what happens when cumulative wages approach the Social Security cap.

Breaking Down Social Security and Medicare Tax Rates

FICA has two components, and they follow different wage rules. Social Security, also called OASDI, has an annual wage base. Medicare, also called HI, does not. The Social Security Administration tax-rate history traces these components from a combined 2.0% payroll tax in 1937 to the current structure.

Social Security tax

For 2026, the employee Social Security rate is 6.2%, and the employer contributes a matching 6.2%. Together, the rate is 12.4% on covered wages up to the annual Social Security wage base.

The 2026 wage base is $184,500, according to IRS Publication 15. Payroll withholding works cumulatively. Once an employee's covered wages reach $184,500 during the year, the employer stops withholding the regular 6.2% Social Security tax on later wages. The employer also stops its matching Social Security contribution above that limit.

At the wage base, the maximum employee Social Security withholding is $11,439. The employer match is also $11,439, making the combined Social Security amount $22,878 for one employee who reaches the cap.

Medicare tax

Medicare follows a different rule. The employee rate is 1.45%, and the employer rate is 1.45%, for a 2.9% combined rate. Medicare continues on all covered wages, so it does not stop when Social Security withholding stops, as described in IRS Tax Topic 751.

Higher-paid employees may also have Additional Medicare Tax, an extra 0.9% withheld from employee wages above the applicable threshold. The thresholds are $200,000 for single filers, $250,000 for married filing jointly, and $125,000 for married filing separately. An employer begins withholding this additional amount when wages paid by that employer exceed $200,000. The employer does not match it, according to the 2026 Social Security and Medicare limits guidance.

Tax Component	Employee Rate	Employer Rate	Combined Rate	2026 Wage Base Cap
Social Security, OASDI	6.2%	6.2%	12.4%	$184,500
Medicare, HI	1.45%	1.45%	2.9%	None
Standard FICA total	7.65%	7.65%	15.3%	Social Security portion only
Additional Medicare Tax	0.9% above applicable threshold	None	Employee only	None

Businesses with employees in other countries should keep U.S. payroll calculations separate from local rules. For a comparison involving director compensation and payroll obligations, see this directors national insurance UK guide from Action Accountants Limited.

The practical breakpoint is the wage base. Social Security stops at that limit, while Medicare continues, so an employee's marginal FICA rate changes once cumulative wages cross it. That change matters when forecasting the final payroll runs of the year.

The Wage Base Cliff and How It Changes Your Tax Burden

The wage-base cliff occurs when cumulative wages cross $184,500. Before that point, each additional covered dollar carries the standard employee FICA rate of 7.65%, made up of 6.2% Social Security and 1.45% Medicare. After the Social Security wage base is reached, the next covered dollar carries only the regular 1.45% Medicare charge for the employee, unless Additional Medicare Tax rules also apply.

The change is abrupt rather than gradual. An employee earning $180,000 for the year never reaches the 2026 cap, so the regular employee-side calculation applies to all covered wages. An employee earning $200,000 reaches the cap during the year, then continues paying Medicare on the remaining wages while Social Security withholding has stopped.

Why annual salary alone isn't enough

Payroll teams need cumulative wage tracking, not just an annual salary field. The precise paycheck where withholding stops depends on pay frequency, wage timing, commissions, and bonuses. A year-end bonus can move an employee across the cap in one payroll run, requiring the payroll system to split the bonus between wages still subject to Social Security and wages above the cap.

A midyear hire may never approach the cap with your company's payroll alone. However, a worker with multiple employers can have combined wages above the cap while each employer continues withholding Social Security independently. That issue belongs in employee year-end reconciliation rather than in a simple single-employer forecast.

Annual Salary	Social Security Tax	Medicare Tax	Total FICA Paid	Effective FICA Rate
$90,000	$5,580 employee share	$1,305 employee share	$6,885 employee share	7.65%
$180,000	$11,160 employee share	$2,610 employee share	$13,770 employee share	7.65%
$200,000	$11,439 employee share	$2,900 employee share	$14,339 employee share	7.1695%

The table uses the 2026 rates and wage base published by the IRS. The final effective rate falls because Social Security applies only through the cap, while Medicare applies to the full salary. The employer's standard matching amounts follow the same Social Security and Medicare structure, excluding any employer match for Additional Medicare Tax.

Once an employee reaches the Social Security wage base, forecast the remaining payroll using the Medicare rate rather than the headline FICA rate.

Continuing to withhold Social Security after the cap can create an over-withholding problem. For one employer, payroll should stop the tax at the correct cumulative wage point. For employees with multiple jobs, excess withholding may require reconciliation through the individual tax return, so employees should review year-to-date totals instead of assuming every employer can coordinate with the others.

Calculating FICA With Real Payroll Scenarios

A payroll forecast becomes clearer when each paycheck is split into two calculations: Social Security on covered wages up to the annual wage base, and Medicare on covered wages without that same cap. The examples below use the 2026 rates and assume the stated wages are fully subject to standard FICA. Unless noted, no earlier wages have used the Social Security wage base.

A regular paycheck

An employee earns $65,000 annually and is paid biweekly. Dividing the salary across the pay periods produces a gross paycheck of $2,500. The employee-side calculation is:

• Social Security: $2,500 × 6.2% = $155.
• Medicare: $2,500 × 1.45% = $36.25.
• Total employee FICA withholding: $191.25.

The employer contributes the same $155 for Social Security and $36.25 for Medicare, creating an employer FICA cost of $191.25 for that paycheck. Employee net pay falls by the employee FICA amount before income-tax withholding and other deductions. The employer's payroll cost includes both the gross wage and the employer contribution.

A midyear hire

A worker hired in July receives $80,000 in prorated wages from your business during the year. If those are the worker's only covered wages, the employee stays below the 2026 Social Security wage base:

• Social Security: $80,000 × 6.2% = $4,960.
• Medicare: $80,000 × 1.45% = $1,160.
• Total employee FICA: $6,120.
• Employer FICA match: $6,120.

The wage base is annual, but payroll applies it to cumulative covered wages paid. A later start date does not give the employee a separate wage base.

A bonus crossing the cap

Suppose an employee has $176,100 in cumulative wages before receiving a $15,000 bonus. The remaining Social Security wage-base room is $8,400, calculated as $184,500 minus $176,100.

Payroll applies the 6.2% Social Security rate to only that $8,400, producing $520.80. The other $6,600 of the bonus is above the cap, so it remains subject to Medicare but not regular Social Security. Medicare applies to the full $15,000, producing $217.50 of employee withholding. The employer matches the Social Security and regular Medicare amounts on the taxable portions, excluding any employer match for Additional Medicare Tax.

A free pay stub template with calculator can record gross wages, year-to-date totals, and separate tax components. Businesses that need less manual wage-base tracking can also evaluate cloud payroll for small businesses.

A high earner

For an employee paid $200,000 by one employer, regular Social Security withholding reaches the $11,439 maximum. Medicare withholding is $200,000 × 1.45%, or $2,900. The wage-base cliff lowers the employee's effective FICA rate because Medicare continues after Social Security withholding stops. If later wages exceed $200,000, the employer withholds the employee-only Additional Medicare Tax on the wages above that trigger. Reaching exactly $200,000 does not create tax above the threshold by itself.

Scenario	Gross Pay	Employee SS Tax	Employee Medicare Tax	Employer Total FICA
Biweekly paycheck	$2,500	$155	$36.25	$191.25
Midyear hire wages	$80,000	$4,960	$1,160	$6,120
Bonus, with $8,400 below cap	$15,000	$520.80	$217.50	$738.30
High earner annual wages	$200,000	$11,439	$2,900	$14,339

For year-end forecasting, identify the paycheck that reaches the wage base, then model later payroll at the Medicare rate rather than the full headline FICA rate.

Edge Cases That Catch Employers and Employees Off Guard

The standard calculation works until a worker's circumstances stop matching the assumptions built into a basic payroll worksheet. High wages, multiple jobs, self-employment, and special worker classifications can each change the result.

Additional Medicare Tax

Employers must begin withholding the employee-only 0.9% Additional Medicare Tax once wages paid by that employer exceed $200,000. The employee's filing status doesn't change the employer's withholding trigger. On the individual return, however, the applicable threshold is $200,000 for single filers, $250,000 for married filing jointly, or $125,000 for married filing separately, as summarized in the 2026 Medicare limit guidance.

That distinction can produce an unexpected tax balance. A married employee may have combined wages that exceed the applicable joint threshold even though no single employer withheld enough Additional Medicare Tax.

Multiple employers

Each employer generally tracks its own payroll. If an employee works two jobs, both employers may continue Social Security withholding until each payroll record reaches the wage base. The employee may therefore have excess Social Security withholding based on combined wages and need to reconcile it on the individual tax return.

The employer shouldn't stop withholding based on a worker's unsupported statement that another employer already reached the cap. The employee should keep pay stubs and year-to-date wage records from every job.

Self-employment and special categories

A freelancer or gig worker pays both sides of the standard FICA-equivalent burden through SECA. Someone with both W-2 wages and freelance income should coordinate the two income streams carefully, especially around the Social Security wage base and Medicare obligations. The self-employed tax calculator can provide a starting estimate, but it doesn't replace professional advice for unusual situations.

Statutory employees, clergy, and students working for their own university can have rules that differ from ordinary W-2 payroll. Tips, household employees, and certain nonresident workers also require classification-specific review. Don't apply the standard worksheet automatically when the worker's status is unusual.

Reporting FICA and Staying Compliant

Correct calculation is only half the job. Employers must withhold the employee share, record the employer share, deposit the taxes on the required schedule, and reconcile payroll reports.

The regular reporting workflow

For most employers, Form 941, Employer's Quarterly Federal Tax Return, reports withheld federal income tax along with Social Security and Medicare taxes. Quarterly returns are generally due by April 30, July 31, October 31, and January 31 for the preceding quarters. Payroll deposits follow the employer's applicable deposit schedule, which depends on the required federal payroll tax rules and the employer's lookback liability.

A small employer may qualify to file Form 944 annually when its annual federal employment tax liability is below $2,500. Eligibility and filing permission matter, so don't switch forms solely because the liability appears small.

Reconcile every reporting layer

The totals on quarterly filings should agree with payroll registers and year-end wage statements. Form W-2 Box 4 reports Social Security tax withheld, while Box 6 reports Medicare tax withheld. Employers should reconcile those amounts against quarterly filings before issuing W-2 forms, which generally must be furnished by January 31.

Use payroll software to maintain year-to-date wage bases and deposit records. The IRS Tax Withholding Estimator can assist employees with broader withholding questions, while the Social Security Administration wage-base page provides the annual wage-base announcement.

A payroll register should show, at minimum:

• Cumulative wages: Track each employee's covered wages through every payroll run.
• Tax components: Separate Social Security, regular Medicare, and Additional Medicare withholding.
• Employer liability: Record matching Social Security and Medicare amounts independently.
• Reconciliation status: Compare payroll registers, Form 941 totals, and W-2 figures before filing.

Your FICA Verification Checklist and Calculator Tools

A year-end payroll forecast can change sharply when an employee nears the Social Security wage base. Review each pay period, especially after a bonus, because Social Security withholding stops once cumulative covered wages reach the annual limit. Medicare withholding continues on covered wages, so the marginal FICA rate changes at that point.

1. Verify gross wages: Match the paycheck with the payroll register and year-to-date wages.
2. Separate the rates: Apply 6.2% to Social Security wages still below the cap and 1.45% to covered Medicare wages.
3. Confirm the cliff: For 2026, regular Social Security withholding ends at $184,500 of cumulative covered wages. Use current official instructions when setting up the payroll.
4. Review high-earner withholding: Check whether Additional Medicare Tax applies. The employer does not match that additional employee tax.
5. Reconcile the match: Compare employee Social Security and regular Medicare withholding with the employer contributions.

For repeated calculations, use spreadsheet columns for current wages, cumulative wages, Social Security taxable wages, Medicare wages, employee tax, and employer tax. A payroll and tax calculator can provide a second check for a payroll run, a bonus near the wage base, or projected year-end FICA costs. Review official wage-base announcements and instructions each year because payroll rules can change.