Payroll Tax Terminology Explained: FICA, FUTA, and SUTA

Payroll tax terminology is the vocabulary that describes how wages are measured, taxed, reported, and deposited: gross versus net pay, FICA and FUTA, withholding and wage bases, the forms that tie everything together, and the deadlines that decide whether a business owes penalties. Each term has a narrow technical meaning, and confusing two of them is how employers end up with surprise bills and employees end up misreading their own W-2s.

Gross Pay, Net Pay, and Taxable Wages

Gross pay is total earnings before any subtraction. A $60,000 salary is $60,000 in gross pay no matter what actually lands in the bank account. Every other payroll figure starts here.

Net pay is what remains after deductions and withholdings come out. Most people call it take-home pay. The distance between gross and net can be wide once federal income tax, state income tax, Social Security, Medicare, retirement contributions, and insurance premiums are all removed.

Taxable wages is the portion of gross pay subject to a particular tax, and the number is not the same for every tax. Your federal income taxable wages can differ from your Social Security taxable wages because different deductions and different caps apply to each. A taxable wage base is a ceiling: once your earnings pass that dollar amount for the year, no more of that specific tax is withheld. Social Security has one. FUTA has one. Medicare does not.

Pre-Tax Deductions and Fringe Benefits

Pre-tax deductions lower taxable wages before withholding is calculated, but they do not all reduce every tax.

Traditional 401(k) contributions come out before federal income tax is calculated, so they lower income tax withholding. Those same dollars are still subject to Social Security and Medicare. That is why a W-2 often shows a smaller number in Box 1 (income tax wages) than in Boxes 3 and 5 (Social Security and Medicare wages).¹

Section 125 cafeteria plan deductions work differently. They cover items like employer-sponsored health insurance premiums, flexible spending accounts, and dependent care benefits, and contributions made through a cafeteria plan are generally exempt from federal income tax, Social Security, Medicare, and FUTA.²

Fringe benefits are non-cash perks: a company car, a gym membership, occasional meals. Some are taxable and some are not. The IRS treats de minimis fringe benefits, meaning items so small that tracking them would be impractical (occasional coffee, holiday gifts), as excluded from wages entirely.³

FICA: Social Security and Medicare

FICA, short for the Federal Insurance Contributions Act, is the combined tax funding Social Security and Medicare. Employee and employer each pay a share, which is why it is sometimes called a matched tax. The statute is 26 U.S.C. Chapter 21.⁴

Social Security Tax

The Social Security portion funds Old-Age, Survivors, and Disability Insurance. The rate is 6.2% on the employee and 6.2% on the employer, for a combined 12.4%.⁵ It only applies up to the annual wage base, which for 2026 is $184,500.⁶ Every dollar earned above that ceiling in a calendar year is free from Social Security tax. The cap adjusts annually based on national wage trends.

Medicare Tax

Medicare funds hospital insurance for people 65 and older and for certain people with disabilities. The rate is 1.45% each on employee and employer, totaling 2.9%, and there is no wage base limit. Every dollar of covered wages is taxed.⁷

High earners also owe an Additional Medicare Tax of 0.9% on wages above $200,000 for single filers, $250,000 for married filing jointly, and $125,000 for married filing separately. Employers must begin withholding it once an employee’s wages pass $200,000 in a calendar year, regardless of filing status, and the employer does not match this additional portion.⁷

Unemployment Taxes: FUTA and SUTA

Unemployment taxes pay benefits to workers who lose jobs through no fault of their own. Two layers apply: federal and state. In most states both are employer-only, meaning nothing is deducted from the employee’s paycheck.

Federal Unemployment Tax Act (FUTA)

FUTA applies to the first $7,000 of each employee’s annual wages at a gross rate of 6.0%.⁸⁹ Almost no employer actually pays 6.0%. A credit of up to 5.4% is allowed for contributions to a state unemployment program, dropping the effective federal rate to 0.6%.¹⁰ Form 940 reflects this with a 0.006 multiplier after credits.¹¹

State Unemployment Tax (SUTA or SUI)

Each state runs its own unemployment insurance program with its own rate and wage base. State wage bases range from $7,000 to well over $60,000. An individual employer’s rate is generally set by an experience rating, which adjusts the percentage based on how many former employees have filed claims against the account. Fewer claims usually means a lower rate. New businesses typically start at a default rate until they build enough claims history.

FUTA Credit Reduction States

When a state borrows from the federal Unemployment Trust Fund to pay benefits and does not repay within the set window, the IRS reduces the 5.4% FUTA credit available to employers in that state. Employers there pay more federal unemployment tax even with clean claims records. The list changes annually, and affected employers file Schedule A with Form 940.¹²

Income Tax Withholding and Supplemental Wages

Federal income tax withholding is the amount the employer sends to the IRS from each paycheck toward the employee’s annual income tax bill. It depends on earnings, filing status, and adjustments claimed on the W-4. Unlike FICA’s flat percentages, income tax withholding follows graduated brackets, so higher earners see proportionally more taken out.

State income tax withholding works the same way conceptually. Rates, brackets, and rules vary widely: some states use a flat rate, some progressive brackets, and a handful have no income tax. Some cities and counties impose local income tax on top. Certain neighboring states have reciprocity agreements that let the employer withhold for the employee’s home state instead of the work state.

Supplemental Wages

Supplemental wages are payments outside regular salary: bonuses, commissions, severance, back pay. Employers can withhold federal income tax on these at a flat 22% instead of running them through the normal bracket calculation. If an employee’s supplemental wages exceed $1 million in a calendar year, mandatory withholding jumps to 37% on the amount above $1 million.¹³ The flat 22% is why a bonus check often looks more heavily taxed than a regular one. The final tax owed reconciles at filing.

Self-Employment Tax

Independent contractors, freelancers, and sole proprietors have no employer withholding FICA or matching it. They pay self-employment tax instead, covering both halves of Social Security and Medicare. The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.¹⁴ The same $184,500 Social Security wage base caps the 12.4% portion, and the 0.9% Additional Medicare Tax applies above the same thresholds as for employees.

Half of the self-employment tax, the employer-equivalent portion, is deductible when calculating adjusted gross income. That deduction reduces income tax but does not reduce the self-employment tax itself.¹⁴

Employee or Independent Contractor

Misclassifying a worker is one of the most expensive payroll mistakes a business can make. For an employee, the employer withholds income tax, withholds and matches FICA, pays FUTA, and issues a W-2. For an independent contractor, none of that applies. The business reports payments of $600 or more on Form 1099-NEC and the worker handles their own taxes.¹⁵

The IRS looks at three categories of evidence:¹⁶

Behavioral control: whether the company dictates how the worker performs the job, not just what the end result should be.
Financial control: whether the business controls how the worker is paid, whether expenses are reimbursed, and who provides tools and supplies.
Relationship of the parties: whether there are written contracts, employee-type benefits like insurance or a pension, and whether the work is a core part of the business.

No single factor decides it. When the classification is genuinely unclear, either side can file Form SS-8 asking the IRS for a formal determination.¹⁷

Payroll Reporting Forms

Several IRS forms track payroll taxes through the year. Each has a specific job.

Form W-4: the employee tells the employer how much federal income tax to withhold. It captures filing status and adjustments for dependents or other income. A new W-4 is not required every year, but updating it after major life changes prevents surprises at filing.¹⁸
Form 941: filed quarterly to report federal income tax withheld plus both shares of Social Security and Medicare.¹⁹
Form 944: a simplified annual version of Form 941 for very small employers whose total annual liability for Social Security, Medicare, and withheld income tax is $1,000 or less. The IRS notifies eligible businesses that they qualify.²⁰
Form 940: filed annually for FUTA. This is separate from the state unemployment returns each state requires.²¹
Form W-2: issued to each employee by January 31. It summarizes total earnings, federal and state income tax withheld, Social Security and Medicare wages and taxes, and retirement contributions.²²
Form 1099-NEC: reports nonemployee compensation of $600 or more paid to independent contractors. No payroll taxes are withheld on these payments.¹⁵

Deposit Schedules and Late Penalties

The deposit schedule sets how quickly withheld taxes have to reach the IRS, and it is based on a lookback period.

For Form 941 filers the lookback period covers four quarters running July 1 of two years ago through June 30 of the prior year. Total tax liability of $50,000 or less during that window makes an employer a monthly depositor, with each month’s taxes due by the 15th of the following month. Above $50,000, the employer is a semiweekly depositor with tighter deadlines tied to each payday.²³

On either schedule, accumulating $100,000 or more in taxes on a single day requires deposit by the next business day. Hitting that threshold also moves the employer to the semiweekly schedule for the rest of the year and the following year.²³

Missing a deposit deadline triggers the failure-to-deposit penalty, which escalates with lateness:²⁴

1–5 calendar days late: 2% of the unpaid amount.
6–15 calendar days late: 5%.
More than 15 calendar days late: 10%.
More than 10 days after an IRS notice, or on receiving a demand for immediate payment: 15%.

Trust Fund Recovery Penalty

The withheld portion of an employee’s income tax, Social Security, and Medicare is held “in trust” for the government. If the business fails to turn it over, the IRS can pursue individual people, not just the company.

Under 26 U.S.C. § 6672, any person who was required to collect and pay over payroll taxes and willfully failed to do so can be held personally liable for a penalty equal to the full unpaid tax. “Person” is not limited to owners. It can include officers, partners, bookkeepers, or anyone with authority to sign checks and decide which bills to pay. The IRS must give at least 60 days’ written notice before assessing the penalty, except when it believes collection is at risk.²⁵

1
Internal Revenue Service. Are Retirement Plan Contributions Subject to Withholding for FICA, Medicare, or Federal Income Tax
2
Internal Revenue Service. FAQs for Government Entities Regarding Cafeteria Plans
3
Internal Revenue Service. Employer’s Tax Guide to Fringe Benefits
4
Office of the Law Revision Counsel. 26 USC Ch 21 – Federal Insurance Contributions Act
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Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax
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Social Security Administration. Contribution and Benefit Base
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Internal Revenue Service. Topic No 751, Social Security and Medicare Withholding Rates
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Office of the Law Revision Counsel. 26 USC Ch 23 – Federal Unemployment Tax Act
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Office of the Law Revision Counsel. 26 USC 3306 – Definitions
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Office of the Law Revision Counsel. 26 USC 3302 – Credits Against Tax
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Internal Revenue Service. Form 940 – Employer’s Annual Federal Unemployment (FUTA) Tax Return
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Internal Revenue Service. Schedule A (Form 940) – Multi-State Employer and Credit Reduction Information
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Internal Revenue Service. Publication 15 (Circular E), Employer’s Tax Guide
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Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
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Internal Revenue Service. Reporting Payments to Independent Contractors
16
Internal Revenue Service. Worker Classification: Employee or Independent Contractor
17
Internal Revenue Service. About Form SS-8, Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding
18
Internal Revenue Service. About Form W-4, Employee’s Withholding Certificate
19
Internal Revenue Service. About Form 941, Employer’s Quarterly Federal Tax Return
20
Internal Revenue Service. Instructions for Form 944
21
Internal Revenue Service. About Form 940, Employer’s Annual Federal Unemployment (FUTA) Tax Return
22
Internal Revenue Service. About Form W-2, Wage and Tax Statement
23
Internal Revenue Service. Topic No 757, Forms 941 and 944 – Deposit Requirements
24
Internal Revenue Service. Failure to Deposit Penalty
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Office of the Law Revision Counsel. 26 USC 6672 – Failure to Collect and Pay Over Tax, or Attempt to Evade or Defeat Tax