Payroll withholding taxes for employers come down to three federal deductions from every employee’s paycheck: federal income tax based on the worker’s Form W-4, Social Security tax at 6.2% on wages up to $184,500 in 2026, and Medicare tax at 1.45% on all wages. You match the Social Security and Medicare amounts out of your own funds, deposit everything through the Electronic Federal Tax Payment System on the schedule the IRS assigns you, and reconcile the numbers on a quarterly return. Miss a deadline and the penalties start at 2% and climb from there.
What Comes Out of Each Paycheck
Federal income tax is the biggest and most variable deduction. The amount depends on how the employee completes Form W-4 and how much they earn in the pay period. The requirement to withhold and remit it sits in the Internal Revenue Code.1Office of the Law Revision Counsel. 26 USC 3402 – Income Tax Collected at Source
The other two federal deductions fall under FICA. Social Security tax is withheld at 6.2% on wages up to $184,500 in 2026; once an employee crosses that ceiling, you stop withholding Social Security for the rest of the year.2Social Security Administration. Contribution and Benefit Base Medicare tax is 1.45% on all wages with no cap.3Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
An extra layer applies to high earners. Once an employee’s cumulative wages with you pass $200,000 in a calendar year, you begin withholding an Additional Medicare Tax of 0.9% on every dollar above that mark, and continue through year-end. The trigger is your payroll alone; the employee’s filing status and any other jobs don’t factor in.4Internal Revenue Service. Questions and Answers for the Additional Medicare Tax
On top of what you withhold from the worker, you owe a matching 6.2% for Social Security and 1.45% for Medicare from your own funds.5Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax The employer match isn’t taken from the paycheck, but it does get deposited alongside the withheld amounts as part of your total employment tax liability.
Who Counts as an Employee
None of this applies to independent contractors. You don’t withhold anything from a contractor’s payment; they handle their own tax. So the classification question comes before any payroll math, and getting it wrong is one of the more expensive mistakes a business can make.
The IRS weighs three categories of evidence to decide whether someone is a common-law employee:6Internal Revenue Service. Employee (Common-Law Employee) behavioral control (whether you direct how, when, and where the work happens); financial control (who provides tools, how payment is structured, whether expenses are reimbursed); and the type of relationship (written contract, benefits, expectation of ongoing work). The label in a contract doesn’t decide anything. Calling someone a freelancer doesn’t make them one if the relationship looks like employment.
If you’re not sure, either party can file Form SS-8 and ask the IRS for a formal determination.7Internal Revenue Service. About Form SS-8, Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding If the IRS later reclassifies workers you treated as contractors, you can be held liable for the payroll taxes you should have withheld. Limited relief exists when you had a reasonable basis for the classification and filed consistent information returns, and the Voluntary Classification Settlement Program allows employers to reclassify workers going forward and settle past liability at a reduced rate.8Internal Revenue Service. Independent Contractor (Self-Employed) or Employee?
Paperwork Before the First Paycheck
Two forms need to be complete before you run payroll for a new hire. Form W-4 tells you how to calculate federal income tax withholding. The employee picks a filing status and can adjust for multiple jobs, dependent credits, other income, or a fixed extra amount per pay period.9Internal Revenue Service. Form W-4 – Employee’s Withholding Certificate Form I-9 verifies identity and work authorization; every U.S. employer must complete one for each hire.10U.S. Citizenship and Immigration Services. I-9, Employment Eligibility Verification
You also need the employee’s Social Security Number, or an Individual Taxpayer Identification Number if they don’t have an SSN, to report wages correctly. Keep all employment tax records for at least four years after filing the fourth-quarter return for the year in question.11Internal Revenue Service. Employment Tax Recordkeeping When an employee’s situation changes, they should submit a new W-4 so their withholding tracks reality.
Calculating Federal Income Tax Withholding
IRS Publication 15, also called Circular E, is the reference employers use to calculate federal income tax withholding, and it’s updated each year for current rates and brackets.12Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide Two methods are available. The wage bracket method has you look up the employee’s pay period, filing status, and wage range in a table that gives the withholding amount directly. The percentage method applies a formula to taxable wages after subtracting a standard deduction amount built into the tables; it’s what most payroll software uses.
FICA is more straightforward because the rates are fixed. Multiply gross wages by 6.2% for Social Security until cumulative wages hit $184,500, then stop. Multiply gross wages by 1.45% for Medicare on every dollar. Once cumulative wages pass $200,000, add the 0.9% Additional Medicare Tax to each subsequent paycheck.
Bonuses and Other Supplemental Pay
Bonuses, commissions, severance, and similar supplemental wages have their own income tax withholding rules. When the employee has less than $1 million in supplemental wages for the year, you can use either of two methods.12Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide The flat rate method withholds 22% on the supplemental payment, which is simpler and common for standalone bonus checks.13Internal Revenue Service. Publication 15-T, Federal Income Tax Withholding Methods The aggregate method combines the bonus with regular pay for the period, calculates withholding on the total, then subtracts what you already withheld from the regular wages; this often withholds more because the combined amount lands in a higher bracket for that pay period.
The 22% flat rate is available only if you also withheld income tax from the employee’s regular wages in the current or preceding calendar year. FICA applies to supplemental wages exactly as it does to regular wages, with no special rate.
Depositing the Money
Federal employment tax deposits go through the Electronic Federal Tax Payment System.14Internal Revenue Service. EFTPS: The Electronic Federal Tax Payment System The IRS puts each employer on either a monthly or semi-weekly deposit schedule based on tax liability during a lookback period. Monthly depositors pay by the 15th of the following month. Semi-weekly depositors have a shorter window of a few business days after each payday.
Late deposits carry escalating penalties on the amount not deposited on time:15Office of the Law Revision Counsel. 26 USC 6656 – Failure to Make Deposit of Taxes
- 1 to 5 days late: 2%
- 6 to 15 days late: 5%
- More than 15 days late: 10%
- Still unpaid 10 days after a delinquency notice: 15%
Interest accrues from the original due date as well, so even a short slip can get costly at any real payroll volume.
Quarterly and Annual Returns
Most employers file Form 941 each quarter to report wages paid, federal income tax withheld, and both shares of FICA. The return reconciles your deposits against what you actually owed for the quarter.16Internal Revenue Service. Instructions for Form 941 Very small employers with $1,000 or less in total annual employment tax liability file Form 944 once a year instead.17Internal Revenue Service. About Form 944, Employer’s Annual Federal Tax Return
By January 31, you must issue Form W-2 to every employee and file copies with the Social Security Administration. The SSA uses that data to update earnings records that affect future retirement benefits, so accuracy matters beyond the tax return.18Social Security Administration. Deadline Dates to File W-2s
Federal Unemployment Tax
FUTA sits apart from FICA. The gross rate is 6.0% on the first $7,000 of each employee’s annual wages, but employers who pay state unemployment taxes on time earn a credit of up to 5.4%, dropping the effective rate to 0.6%. In most states that works out to a maximum of $42 per employee per year.19Internal Revenue Service. FUTA Credit Reduction FUTA is paid entirely by the employer; nothing comes out of the employee’s paycheck.
Report FUTA annually on Form 940, due January 31.20Internal Revenue Service. About Form 940, Employer’s Annual Federal Unemployment (FUTA) Tax Return If your FUTA liability exceeds $500 in any quarter, deposit that amount by the end of the following month rather than waiting for the annual return. Some states carry outstanding federal unemployment loans that trigger a credit reduction, meaning employers there pay a higher effective FUTA rate. The IRS publishes the affected states each November.
State and Local Withholding
Federal rules aren’t the whole picture. Most states have their own income tax withholding requirements, top marginal rates range from zero in states with no income tax to over 13% in the highest-tax states, and many states use their own withholding certificate rather than the federal W-4. If you have employees working in multiple states, you’ll typically need to register with each state’s tax agency and track where the work is performed.
State unemployment taxes (SUTA) add an employer-paid obligation with rates that vary by state, industry, and layoff history. A handful of states also require a small employee contribution to unemployment insurance. Some cities and counties layer on local income or occupational taxes as well.
Personal Liability for Trust Fund Taxes
The withheld income tax and the employee’s share of FICA are considered held in trust for the government. If a responsible person willfully fails to collect, account for, or pay over those trust fund taxes, the IRS can assess a Trust Fund Recovery Penalty equal to the full unpaid amount, and it attaches to that person individually.21Office of the Law Revision Counsel. 26 USC 6672 – Failure to Collect and Pay Over Tax, or Attempt to Defeat or Evade Tax
A responsible person is anyone with the authority to decide which creditors get paid: owners, officers, payroll managers, sometimes bookkeepers. If the business can’t cover the tax, the IRS can pursue those individuals personally. The classic trigger is using withheld payroll taxes to pay rent or make payroll during a cash crunch rather than sending them to the government. It is the one part of payroll compliance where the consequences routinely reach past the company and into someone’s personal finances, and it’s the reason payroll deposits should be treated as untouchable no matter what the rest of the ledger looks like.