Understanding Federal Payroll Taxes: FICA, FUTA, and Income Tax Withholding

5/2/2026

There are only three federal payroll taxes, but they behave so differently from each other that treating them as one topic is the fastest route to a reconciliation failure. FICA is shared between employer and employee and has two components with different wage bases. FUTA is employer-only with a credit mechanism that can change without warning. Income tax withholding is not a tax on the employer at all — it is a collection obligation, and the employer becomes personally liable if it fails.

This guide separates them properly, gives the current 2026 figures, and explains the deposit and filing machinery that sits on top.

The Three Federal Payroll Taxes at a Glance

Tax	Who pays	2026 rate	2026 wage base	Return
Social Security (OASDI)	Employee + employer	6.2% each	First $184,500	Form 941
Medicare	Employee + employer	1.45% each	Unlimited	Form 941
Additional Medicare	Employee only	0.9%	Wages over $200,000	Form 941
FUTA	Employer only	6.0% less credit up to 5.4%	First $7,000	Form 940
Federal income tax	Withheld from employee	Per W-4 and tables	Varies	Form 941

Everything else that appears on a pay stub — state withholding, state unemployment, local taxes, paid family leave contributions — is a state or local obligation layered on top. Our Multi-State Taxation training covers that layer.

FICA: Social Security and Medicare

The Federal Insurance Contributions Act imposes two separate taxes that are usually discussed as one. Keeping them separate matters because their wage bases differ.

Social Security (OASDI)

The employee pays 6.2% and the employer matches 6.2%, for a combined 12.4%. The tax applies only to wages up to the annual taxable maximum, which for 2026 is $184,500 (up from $176,100 in 2025). Once an employee's Social Security wages reach that figure, both the employee and employer stop paying OASDI for the remainder of the year.

Two consequences practitioners routinely mishandle:

• The wage base does not reset when an employee changes jobs. A new employer starts the base over from zero. The employee may over-pay across two jobs and recovers the excess on their personal return; the employer does not get a refund and should not attempt to credit it.
• The wage base does reset for a successor employer — except in specific statutory successor situations following certain acquisitions, where wages paid by the predecessor may be counted. This is a common M&A payroll error.

Medicare

The employee pays 1.45% and the employer matches 1.45%, for a combined 2.9%, on all wages. There is no wage base. High earners therefore keep paying Medicare after Social Security has stopped, which is why a highly compensated employee's net pay jumps mid-year and then only partially.

Additional Medicare Tax

An extra 0.9% applies to an individual's wages above $200,000, and it is employee-only — the employer does not match it. Employers must begin withholding it in the pay period in which cumulative wages exceed $200,000 and must not attempt to account for filing status or a spouse's income. The threshold for the employer's withholding duty is always $200,000 regardless of the employee's actual filing situation; any true-up happens on the individual return.

The mechanics of the $200,000 threshold, deferred compensation, and equity vesting events are covered in our IRS taxation rules for highly compensated employees session.

What Counts as FICA Wages

FICA wages are broader than most people expect. They generally include:

• Regular wages, overtime, bonuses, commissions
• Most taxable fringe benefits, including personal use of a company vehicle
• Group-term life insurance coverage above $50,000 (imputed income)
• Non-qualified deferred compensation, generally when vested
• Traditional 401(k) elective deferrals — these reduce income tax wages but not FICA wages

They generally exclude:

• Section 125 cafeteria plan contributions for health premiums, health FSA, and dependent care FSA
• HSA contributions made through a cafeteria plan
• Qualified expense reimbursements under an accountable plan
• Employer contributions to a qualified retirement plan

That 401(k) asymmetry is the single most common cause of a Form W-2 that will not tie to a Form 941. Our 401(k) Training & Certification Program and Cafeteria Plan Training & Certification Program address both sides of it, and payroll rules for fringe benefits covers imputed income.

FUTA: Federal Unemployment Tax

FUTA funds the federal share of the unemployment insurance system. It is paid entirely by the employer and may never be deducted from an employee's pay — doing so is a violation, not merely a bookkeeping preference.

The gross rate is 6.0% on the first $7,000 of each employee's annual wages. Against that, employers claim a credit of up to 5.4% for timely state unemployment contributions, producing a familiar net rate of 0.6%, or $42 per employee per year at full credit.

Three things reduce or destroy that credit:

1. Late state unemployment payments. The credit is conditioned on timely payment to the state. Paying SUI late can cost far more in lost FUTA credit than the state's own late-payment penalty.
2. Credit reduction states. When a state has an outstanding federal unemployment loan for consecutive years, the FUTA credit for employers in that state is reduced — typically in 0.3% increments — raising the effective FUTA rate. The list changes annually and is not published far in advance, so a credit reduction can appear on a Form 940 that was budgeted at 0.6%.
3. Nonpayment of state tax on certain wages. Wages exempt from state unemployment tax but subject to FUTA get no credit.

FUTA is reported annually on Form 940, but deposits are required quarterly once accumulated liability exceeds $500. Our Form 940 and Federal-State Unemployment Overview session covers the return and the credit-reduction calculation.

Federal Income Tax Withholding

This is not an employer tax. The employer is a collection agent, and that distinction is why the penalties are so severe: withheld income tax is a trust fund held for the government.

The W-4 Drives Everything

Withholding is computed from the employee's Form W-4. The redesigned form eliminated withholding allowances and instead collects filing status, multiple-jobs adjustments, dependent credits, other income, deductions, and any additional flat amount.

Rules worth memorizing:

• If no valid W-4 is on file, withhold as single with no adjustments. Do not guess and do not use a prior form's data if the employee has submitted an invalid replacement.
• An employee may not claim exempt status casually — exemption requires meeting specific conditions and must be re-filed annually, expiring in mid-February of the following year.
• The employer does not police the accuracy of a W-4, but it must honor an IRS lock-in letter over the employee's own election.

Our Form W-4 update and OBBBA changes session covers how federal withholding is now calculated, and the payroll forms update session tracks form revisions.

Two Calculation Methods

The IRS permits either the wage bracket method (table lookup) or the percentage method (formula). Both appear in IRS Publication 15-T and both are acceptable; nearly all software uses the percentage method because it handles any pay frequency.

Supplemental Wages Are Different

Bonuses, commissions, severance, and other supplemental wages may be withheld two ways:

• Optional flat rate: 22%, available when the supplemental payment is identified separately from regular wages
• Aggregate method: combine with regular wages for the period and withhold as if it were one payment

There is one mandatory rule: supplemental wages exceeding $1,000,000 to one employee in a calendar year must be withheld at the highest income tax rate — 37% — on the excess, with no flat-rate option. This catches companies during acquisitions and large severance events.

New for 2026: Separate Reporting of Qualified Tips and Overtime

The One Big Beautiful Bill Act created individual federal deductions for qualified tips and qualified overtime compensation for tax years 2025 through 2028. The employer consequence begins in earnest with the 2026 tax year: qualified overtime compensation and qualified tips must be separately reported on Form W-2, using dedicated Box 12 codes.

Two points that matter operationally:

• Only the premium portion of overtime mandated by Section 7 of the FLSA is "qualified." Voluntary overtime, premiums owed only under state law or a collective bargaining agreement, and overtime-style bonuses do not count.
• These deductions do not change FICA. Qualified tips and qualified overtime remain fully subject to Social Security and Medicare, and remain wages for withholding purposes unless guidance provides otherwise. The benefit is claimed by the individual on their return.

If your system aggregates overtime into a single earnings code, isolating the premium is a system configuration project. Our OBBBA payroll forms update session covers the reporting changes.

Deposit Rules: Where the Real Risk Lives

Calculating correctly and depositing late still produces penalties. Federal employment tax deposits follow one of two schedules, determined by your lookback period liability:

Schedule	Trigger	Deposit due
Monthly	= $50,000 in lookback period	15th of the following month
Semi-weekly	> $50,000 in lookback period	Wed. or Fri. depending on payday
Next-day	$100,000 accumulated liability	Next business day

The $100,000 next-day rule overrides everything else and is the classic trap: a single large bonus payroll can trigger it for an employer that has always been a monthly depositor, and it also permanently promotes that employer to semi-weekly status for the remainder of the year and the next.

Failure-to-deposit penalties are tiered by lateness and reach 10% at ten days, plus 15% where a notice has been issued. Worse, the Trust Fund Recovery Penalty allows the IRS to assess 100% of the unpaid trust fund portion personally against any responsible person who willfully failed to remit — an individual liability that survives corporate bankruptcy.

Our How To Minimize And Eliminate Payroll Penalties session addresses abatement strategy, and How To Handle Payroll Audits & Penalties covers the examination side.

Five FICA Edge Cases Worth Knowing

These come up often enough to be worth memorizing, and each one is a routine audit finding when handled by instinct.

Successor employers. In most acquisitions the buyer starts each employee's Social Security wage base at zero, which means the combined entities pay OASDI twice on the same wages. In specific statutory successor situations, however, wages paid by the predecessor may be counted toward the base, avoiding the double payment. Determining which situation you are in is a transaction-structure question, and getting it wrong in either direction is expensive — over-collecting irritates employees, under-collecting creates a liability.

Third-party sick pay. When an insurer or third-party administrator pays disability benefits, responsibility for FICA and for the Form W-2 reporting depends on whether the third party is acting as the employer's agent and who funded the premiums. The reporting is split, and Form 8922 exists specifically to reconcile the pieces. Payroll must know which arrangement applies before year end, not during it.

Deceased employees. Wages paid after death in the same calendar year are generally subject to FICA but not to federal income tax withholding, and they are reported differently than ordinary wages. Wages paid in a later year are generally exempt from FICA as well. Our Handling Complex Payroll Payments: Deceased Employees, More session covers the sequence.

Nonresident alien employees. Withholding rules differ, certain visa categories are exempt from FICA entirely, and treaty provisions can override the default treatment. Applying standard withholding to an exempt visa holder over-collects for years. See IRS rules for work visas and inpat/expat payroll rules.

Employees with two roles at related entities. Common paymaster rules can allow related corporations to treat wages as paid by a single employer for FICA purposes, avoiding a duplicated wage base. The arrangement has requirements; assuming it applies because the entities share ownership is a mistake.

Quarterly and Annual Filings

• Form 941, quarterly, due the last day of the month following quarter end. Reports wages, income tax withheld, and FICA. Corrections use Form 941-X.
• Form 940, annually, due January 31 for FUTA.
• Forms W-2/W-3, due to employees and the SSA by January 31. Corrections use Form W-2c.
• Form 945 for backup withholding and non-payroll withholding.

Reconcile Form 941 totals to your payroll register every quarter, not once in January. Four small reconciliations beat one December investigation, and they catch systemic errors while correction is still cheap. Our The 941 — Completing And Calculating FICA And FIT and Payroll Reconciliation And Reporting sessions cover the tie-out.

A Practical Federal Tax Checklist

Run this quarterly:

4. Confirm every active employee has a valid W-4; re-solicit expiring exempt claims each February
5. Verify Social Security wages stopped at the current-year taxable maximum for anyone who reached it
6. Verify Additional Medicare withholding began at $200,000 cumulative wages
7. Confirm no employee has had FUTA deducted from pay
8. Check whether any state you operate in is a FUTA credit reduction state this year
9. Tie payroll register wages and taxes to the filed Form 941
10. Confirm every deposit was made on the correct schedule, and check whether any payroll triggered the $100,000 next-day rule
11. Confirm 401(k) deferrals reduced income tax wages but not FICA wages
12. Confirm qualified overtime premium is being captured in its own earnings code for 2026 W-2 reporting

Frequently Asked Questions

What are the federal payroll taxes?

There are three. FICA, consisting of Social Security at 6.2% and Medicare at 1.45% paid by both employee and employer, plus an employee-only Additional Medicare Tax of 0.9% on wages above $200,000. FUTA, the federal unemployment tax, paid entirely by the employer at 6.0% on the first $7,000 of wages with a credit of up to 5.4% for timely state unemployment payments. And federal income tax withholding, which is not an employer tax at all — the employer collects it on the government's behalf.

What is the Social Security wage base for 2026?

$184,500, up from $176,100 in 2025. Once an employee's Social Security wages reach that figure, both the employee and the employer stop paying the 6.2% OASDI tax for the remainder of the year. Medicare has no wage base and continues on all wages.

Can an employer deduct FUTA from an employee's pay?

No. FUTA is an employer-only tax and deducting it from an employee's wages is a violation, not a bookkeeping preference. The same is true of the employer's matching share of Social Security and Medicare.

Does a 401(k) contribution reduce Social Security and Medicare taxes?

No. A traditional 401(k) elective deferral reduces federal income tax wages but not Social Security or Medicare wages. This is why Box 1 of Form W-2 is legitimately lower than Boxes 3 and 5 for employees who defer. Section 125 cafeteria plan contributions, by contrast, reduce all three bases.

What is the penalty for late payroll tax deposits?

Failure-to-deposit penalties are tiered by lateness and reach 10% at ten days, with 15% available once the IRS has issued a notice, plus interest. The more serious exposure is the Trust Fund Recovery Penalty, which allows the IRS to assess 100% of the unpaid trust fund portion personally against any responsible individual who willfully failed to remit — a liability that survives corporate bankruptcy.

What is the $100,000 next-day deposit rule?

Any time accumulated employment tax liability reaches $100,000, the deposit is due the next business day regardless of whether you are normally a monthly or semi-weekly depositor. It also promotes the employer to semi-weekly status for the remainder of the year and all of the following year. A single large bonus, severance round, or equity vesting event can trigger it for an employer that has been a monthly depositor for years.

Building Real Fluency

Federal payroll tax is a small body of rules applied under time pressure, which is why errors cluster around the exceptions rather than the basics. If you want structured coverage:

• Paycheck Fundamentals Training & Certification Program — gross-to-net and taxable wage mechanics
• Payroll Reporting Training & Certification Program — returns, deposits, and year-end
• Certified Payroll Administrator — the credential most employers recognize
• Glossary of payroll terms — for the vocabulary

Rates and wage bases change annually. Verify the current-year figures against IRS Publication 15 and the Social Security Administration's announcement before your first payroll of each January.