Payroll tax is a tax collected or paid through an employer’s payroll because of wages paid to employees. In the United States, the term most often refers to Social Security and Medicare taxes under the Federal Insurance Contributions Act (FICA), plus federal and state unemployment taxes. Employers withhold the employee’s share of applicable taxes from wages and pay their own required contributions separately. Federal income tax withheld from a paycheck is also administered through payroll, but it is distinct from FICA because it is a prepayment of the employee’s personal income tax and has no matching employer contribution. Which taxes apply depends on the worker’s employment status, the type of payment and the relevant federal or state rules. Understanding these distinctions helps workers interpret deductions and helps organizations account for payroll costs and tax responsibilities.
Table of Contents
- Which Taxes Are Included in Payroll Tax?
- Who Pays Payroll Taxes?
- Which Pay Is Subject to Payroll Tax?
- How Are Payroll Taxes Calculated and Reported?
- How Do State Rules and Worker Location Affect Payroll Tax?
- What Does Payroll Tax Mean for Contingent Workers?
Which Taxes Are Included in Payroll Tax?
FICA consists of Social Security tax and Medicare tax. In 2026, the employee and employer each pay Social Security tax at 6.2% on covered wages up to the annual wage limit of $184,500. Each also pays Medicare tax at 1.45% on covered wages. Medicare has no annual wage limit. An employee’s Social Security tax withheld is generally matched by the employer’s contribution. The employee’s share appears as a wage deduction while the employer’s share is an additional business expense. The IRS explains the current rates and wage limit in its 2026 Employer’s Tax Guide.
Employers must also withhold an additional 0.9% Medicare tax from an employee’s wages paid by that employer after the employee’s wages exceed $200,000 during the calendar year. There is no employer match for this additional withholding. The withholding threshold is not necessarily the threshold for an employee’s final tax liability because that depends on the employee’s income and filing circumstances. Social Security tax and Medicare tax therefore have different limits and withholding details, even though both are part of FICA.
Federal income tax withholding is calculated separately using the employee’s Form W-4 and applicable withholding rules. Federal unemployment tax under FUTA is generally an employer-paid tax. State unemployment taxes follow state rules and may include employee contributions in some states. State or local income tax withholding may also apply. These different taxes are handled through payroll but should not be treated as one uniform charge.
Who Pays Payroll Taxes?
For a covered employee, payroll tax costs can fall on both the employee and the employer. The employee’s share of Social Security and Medicare tax is withheld from wages. The employer pays a corresponding share of regular FICA taxes and generally pays FUTA. These employer expenses do not reduce the employee’s gross wages. The distinction matters when comparing a worker’s gross pay with the organization’s total employment cost.
Federal income tax withholding works differently. The employer withholds an amount from the employee’s pay and sends it to the government as a payment toward the employee’s income tax. It is not a separate employer contribution matched to the employee’s withholding. For a broader explanation of the employer-paid portion, see employer payroll taxes.
Independent contractors are generally responsible for their own federal income tax and self-employment tax rather than having employee FICA withheld from their payments. But a contract label or a short assignment does not by itself settle worker status. The IRS considers the facts of the relationship, including control over the work and the financial arrangement. Its employee or independent contractor guidance describes federal tax factors and options when status is unclear.
Which Pay Is Subject to Payroll Tax?
Taxable wages can include regular salary as well as bonuses and commissions. Some noncash compensation may also count. The tax treatment depends on the applicable tax rule and the nature of the payment, not simply on the name used on a payroll record. Employers identify the taxable wage amount for each tax before calculating withholding and employer contributions.
One payment can be treated differently under different tax rules. For example, a traditional 401(k) salary deferral generally reduces wages subject to federal income tax withholding but remains subject to Social Security and Medicare tax. As a result, an employee’s federal income tax wages may differ from their Social Security wages. Reimbursements and benefits also require review under the rules that apply to them rather than an assumption that every payment is taxable or excluded.
Employers track year-to-date wages because some calculations change when an employee reaches a limit or withholding threshold. The Social Security wage limit applies to covered earnings during the year. Medicare tax does not have the same wage ceiling, while Additional Medicare Tax withholding starts at a separate employer-specific threshold. Accurate wage records help payroll distinguish these amounts and report them correctly.
How Are Payroll Taxes Calculated and Reported?
Payroll calculation starts with the worker’s status and the payments made during a pay period. The employer determines which wages are subject to each tax, applies the appropriate rates and accounts for year-to-date totals. The resulting record separates employee withholding from employer contributions. This makes it possible to calculate the worker’s net pay without treating employer contributions as deductions from the paycheck.
For example, consider $2,000 in wages fully subject to regular FICA for an employee who is below the Social Security wage limit and the Additional Medicare Tax withholding threshold. The employee’s Social Security withholding is $124 and Medicare withholding is $29. The employer generally owes another $153 in regular FICA contributions. The employee’s remaining $1,847 is before federal or other applicable income tax withholding and any other deductions. It is therefore not necessarily the employee’s final take-home amount.
Employers generally report federal income tax withholding and FICA on quarterly Form 941. FUTA is generally reported annually on Form 940, though deposit requirements can apply during the year. The deposit schedule depends on applicable tax-liability history and special rules may apply. Filing a return and making tax deposits are separate tasks. Federal rules do not replace state or local reporting requirements where those apply.
How Do State Rules and Worker Location Affect Payroll Tax?
Federal payroll taxes apply under federal rules, but state unemployment insurance and income tax withholding can vary by state. States set their own unemployment tax rules and may set different wage limits or employer rates. Some require employee contributions to unemployment programs. State or local income tax withholding may also depend on where an employee works or lives and on the rules of the jurisdictions involved.
For a remote worker, the employer’s headquarters alone may not identify every relevant tax location. Work location can affect which state or local withholding rules need review. Organizations should collect accurate location information and update payroll records when work arrangements change. The appropriate treatment depends on the jurisdictions involved, so a rule that applies in one state should not be assumed to apply everywhere.
Unemployment taxes are also distinct from FICA. FUTA is a federal employer-paid tax, while state unemployment insurance is administered under state law. The federal credit against FUTA may depend on whether the employer qualifies under applicable rules and has met state payment requirements. Because rates and requirements can vary, employers should use current guidance for each tax year rather than rely on a general estimate.
What Does Payroll Tax Mean for Contingent Workers?
For contingent workers, payroll tax depends in part on whether the worker is treated as an employee or an independent contractor under the applicable rules. A temporary or project-based assignment does not automatically determine that status. The IRS says federal classification depends on the actual working relationship. Organizations need to understand who employs the worker and which party is responsible for withholding, paying and reporting employment taxes.
In contingent workforce management, an employer-of-record or payrolling arrangement may place payroll administration with the organization employing the worker. The practical setup should make clear whose employer tax account is used and how wages and work-location changes are communicated. This matters when an assignment crosses state lines or changes location. Clear responsibility for accurate worker and payment information helps payroll calculations reflect the circumstances of the assignment.
Using a third party to help administer payroll does not always transfer the employer’s tax liability. The IRS explains that responsibilities depend on the type of third-party arrangement. Many employers remain responsible for timely payment and filing even when a provider performs tasks on their behalf. Its guidance on payroll service providers and reporting agents describes these distinctions. Organizations should confirm the arrangement’s legal structure and understand how deposits and filings are handled.
