FICA is a mandatory payroll tax that funds Social Security and Medicare. Employers and employees are both required to contribute, with taxes automatically withheld from employees' wages and matched by employers. These contributions support retirement, disability and health care benefits under federal programs.

FICA applies to most types of earned income, including salaries, bonuses and tips over $20 per month. The Social Security portion is subject to an annual wage limit, while the Medicare tax applies to all earnings. An extra Medicare tax also applies to employees earning more than $200,000 annually. Compliance with FICA is a core payroll responsibility for human resources (HR) teams, professional employer organizations (PEOs) and administrative services organizations (ASOs).

FICA Payment Responsibilities by Role

FICA is a split tax required by federal law and paid by different parties depending on employment type. Each group has a defined responsibility that affects how tax payments are calculated and reported.

• Employees have a portion of their wages withheld by their employer to cover Social Security and Medicare.

• Employers submit matching contributions as part of regular payroll tax payments.

• Self-employed individuals pay both portions through self-employment tax, based on net earnings.

• Household employers and small business owners may have unique obligations under FICA and related tax regulations.

Because FICA also includes the Additional Medicare Tax for higher earners, HR teams and tax professionals must stay aligned with current tax law and reporting requirements. Understanding who pays what helps reduce tax liability risks and supports accurate bookkeeping.

Breakdown of FICA Tax Components

FICA consists of two distinct taxes: Social Security and Medicare. Each applies at a different rate and has specific rules that affect how payroll is calculated.

• Social Security tax is subject to an annual wage cap, which limits how much of an employee's income is taxed each year.

• Medicare tax has no cap and includes an additional employee-only rate for higher-income brackets, separate from the base Medicare tax rate.

Understanding how these components are applied helps payroll teams follow tax law requirements and calculate employer and employee contributions accurately. This distinction also impacts total tax liability and reporting for businesses of all sizes.

FICA Exemptions by Worker Classification

Some roles and worker classifications are not subject to FICA withholding, depending on employment arrangements or federal tax rules. These exemptions are narrowly defined and typically apply under specific conditions.

Common exemptions include:

• Student workers employed by their school

• Certain nonresident aliens with visa-based exclusions

• Individuals employed by foreign governments or recognized international bodies

• Members of qualifying religious groups with approved Internal Revenue Service (IRS) waivers

• Election officials earning below the annual threshold

These exemptions are not automatic and must follow IRS guidelines. When applied incorrectly, they can affect tax calculations and create compliance issues for employers, payroll teams and third-party providers.

Special Scenarios Under FICA

While standard wages are taxed uniformly, certain compensation types and employment conditions require different FICA handling.

Employees with multiple jobs may exceed the annual wage base for Social Security, resulting in withholding above the applicable Social Security tax rate. Although employers are not responsible for adjustments, employees can recover excess contributions when filing their annual return.

Some fringe benefits, such as personal-use vehicles or employer-provided housing, are considered taxable income and subject to FICA withholding. These amounts are not treated as reimbursable business expenses and must be included when calculating tax obligations.

FICA contributions fund future benefits through hospital insurance under Medicare and disability insurance through Social Security. Applying FICA correctly in non-standard pay situations supports accurate reporting for long-term benefit programs.