Unit
- Payroll tax definition: Payroll taxes are mandatory contributions imposed on employers and employees to fund government programs. They include federal income tax withholding, Social Security and Medicare taxes (FICA), federal unemployment tax (FUTA), and state-level taxes. These are distinct from corporate income taxes and are collected at the source of income.
- Employer vs. employee share: FICA taxes are split between employer and employee. Each pays 6.2% for Social Security and 1.45% for Medicare, totaling 12.4% and 2.9% respectively. The employer also pays FUTA tax of 6.0% on the first $7,000 of wages, while employees contribute to state unemployment taxes through payroll deductions.
- Withholding mechanics: Employers deduct income tax and the employee portion of FICA from gross wages. These amounts are held in trust until deposited with the IRS. The employee's Form W-4 determines income tax withholding based on filing status and allowances. Employers must remit these funds according to a schedule determined by the total tax liability.
- Earnings threshold: Social Security tax applies only up to a wage base, which is adjusted annually for inflation. In 2025, the base is $176,100. Medicare tax has no wage limit, but an additional 0.9% surcharge applies to high earners (over $200,000 single). The Additional Medicare Tax is withheld from employee wages.
- FUTA purpose: Federal Unemployment Tax Act funds state unemployment insurance programs and covers administrative costs. It is paid solely by employers on wages up to $7,000 per employee per year. States with loans from the federal government may have reduced credit rates, increasing the effective FUTA rate.
- State variations: Each state administers its own unemployment insurance (SUTA) and may impose disability insurance (SDI) or paid family leave taxes. Rates vary based on an employer's experience rating and industry. Some states have reciprocal agreements affecting withholding for employees working across state lines.
- Trust fund nature: Withheld payroll taxes are considered trust fund taxes. Employers are custodians of these funds and must not use them for other business purposes. Failure to deposit or pay over trust fund taxes can result in the Trust Fund Recovery Penalty, which is a personal liability for responsible individuals.
- Reporting cycle: Employers file quarterly Form 941 to report wages, tips, and taxes withheld. Annual Form 940 reports FUTA. At year-end, Form W-2 summarizes each employee's annual wages and taxes. The reporting cycle is tied to deposit schedules: monthly or semi-weekly depending on aggregate tax liability.
Regulatory Requirement
Regulation: Internal Revenue Code (IRC) Sections 3401-3405 and 3101-3128
Employers must comply with federal payroll tax requirements under the IRC. Key provisions include the definition of wages, withholding allowances, deposit timeliness, and reporting obligations. Violations can result in penalties ranging from 2% to 15% of underdeposited amounts, plus interest.
Quick Revision
- Payroll taxes include income tax withholding, FICA (Social Security and Medicare), FUTA, and state taxes.
- FICA is split equally between employer and employee, totaling 15.3% for Social Security and Medicare.
- Social Security tax has a wage base limit; Medicare tax does not, with an additional surcharge for high earners.
- FUTA is employer-paid on the first $7,000 of wages, with possible state credits reducing the effective rate.
- Withheld taxes are trust fund amounts; misuse can trigger personal liability under the Trust Fund Recovery Penalty.