How to Set Up Payroll Tax Withholding for US Employees
When you hire your first US employee, you become responsible for withholding payroll taxes—and the IRS takes this seriously. Federal and state governments require you to withhold income tax and employment taxes from wages, then remit them on a strict schedule. Get it wrong and you face personal liability for unpaid taxes, even if the business fails. This guide walks you through setting up payroll tax withholding correctly from the start.
The stakes (why this matters)
Missing a payroll tax deadline or calculating withholding incorrectly isn't a $500 fine. The IRS can hold you personally liable for unpaid employment taxes—a power they exercise more aggressively than almost any other penalty in the US tax system. The trust fund recovery penalty lets them come after your personal assets if your business doesn't have the money to pay.
That said, this isn't complicated once you understand the categories. You're withholding from employees, paying matching taxes yourself, and filing a few forms quarterly. Payroll software handles 90 percent of the math for you—the hard part is just not missing deadlines.
What you withhold from employee wages
Every paycheck, you deduct four things:
Federal income tax. Based on the employee's Form W-4 (their withholding elections) and the current IRS withholding tables. The more they earn or the fewer allowances they claim, the more comes out.
Social Security tax (employee share). Flat 6.2 percent of wages up to an annual wage base ($168,600 in 2024—adjusted yearly). Once they hit that ceiling for the year, you stop withholding Social Security on additional earnings.
Medicare tax (employee share). 1.45 percent of all wages, with no annual ceiling. If they earn above $200,000, there's an extra 0.9 percent on the overage.
State and local income tax. Rules vary wildly by state. Nine states have no income tax (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming). Others use federal W-4 data; some require a separate state form. A few cities and counties pile on local tax too.
The federal and Social Security/Medicare amounts are straightforward math. State and local withholding is where most small-business owners get tangled up—largely because each state's tables look different and update at different times.
What you pay as the employer
Beyond withholding from employees, you owe matching taxes:
Employer Social Security tax. 6.2 percent of wages up to the annual wage base—same as the employee share.
Employer Medicare tax. 1.45 percent of all wages, matching the employee. (You don't match the extra 0.9 percent Medicare tax they pay above $200,000.)
Federal unemployment tax (FUTA). 6.0 percent of the first $7,000 of each employee's annual wages—but if you pay state unemployment insurance on time, you get a credit of up to 5.4 percent, bringing the effective rate down to 0.6 percent.
State unemployment tax (SUTA). Each state runs its own unemployment insurance program with its own rates. Your rate depends on your industry and claims history. New employers usually get a standard new-employer rate.
It's easy to forget that you owe employer taxes in addition to what you withhold from employees. Withholding doesn't pay your share—you fund that separately.
Setting up the process
Get an EIN. If you don't already have an Employer Identification Number, apply online at irs.gov. It's free and issued immediately.
Register with your state. Contact your state's tax agency and unemployment insurance agency to set up your state withholding account and unemployment insurance account. You'll get a state employer number and your unemployment rate.
Collect employee forms. For each new hire, get a Form W-4 (federal withholding), your state's withholding form (if required), and Form I-9 (immigration verification).
Determine your deposit schedule. The IRS assigns deposit frequencies based on your tax liability during a "look-back period":
- Monthly depositor: Total liability $50,000 or less → deposits due by the 15th of the following month
- Semi-weekly depositor: Liability exceeded $50,000 → deposits due Wednesday (for wages paid Wed–Fri) or Friday (for wages paid Sat–Tue)
- Next-day depositor: Accumulate $100,000+ in one day → deposit by the next business day
New employers typically start as monthly depositors.
Choose your payroll system. You can use payroll software, hire a payroll service, or—technically—calculate everything manually. Manual processing is possible but tedious and error-prone; most small businesses use software or outsource. Integration with your accounting software keeps your books accurate.
Running payroll each period
Calculate gross pay, subtract all four withholdings (federal income tax, Social Security, Medicare, state/local), and remit deposits on schedule. Deposit withheld income tax plus both employee and employer Social Security/Medicare through EFTPS.
Late deposits cost you:
- 2 percent if 1–5 days late
- 5 percent if 6–15 days late
- 10 percent if over 15 days late
- 15 percent if not deposited within 10 days of IRS notice
Set calendar reminders or use payroll software that handles deposits automatically. This is not the place to wing it.
Filings and deadlines
Quarterly: Form 941 (Employer's Quarterly Federal Tax Return). Reports total wages, tips, income tax withheld, and Social Security/Medicare taxes.
- Q1 (Jan–Mar): due April 30
- Q2 (Apr–Jun): due July 31
- Q3 (Jul–Sep): due October 31
- Q4 (Oct–Dec): due January 31
Annual: Form 940 (Employer's Annual Federal Unemployment Tax Return). Due January 31 for the prior year.
Annual: Form W-2 (Wage and Tax Statement). By January 31, give each employee a W-2 showing total wages and taxes withheld for the year. File copies with the Social Security Administration.
State filings. Quarterly returns and unemployment reports according to your state's schedule.
If you use a payroll service, they typically handle these filings for you—one of the main reasons it's worth the cost.
Common pitfalls
Wrong withholding tables. IRS tables update yearly. Use stale tables and your withholding will be off. Most payroll software updates automatically.
Mishandling W-4 changes. Employees can update their W-4 anytime. Make sure you're applying their current elections, not last year's.
Forgetting the employer share. Withholding isn't your obligation to the government—matching taxes are. You must pay both.
Misclassifying workers as 1099 contractors. Tempting way to skip payroll, but the IRS looks for this. If someone works on your schedule, under your direction, it's an employee. Period. (See Understanding US Business Structures for more on how structure affects tax obligations.)
Commingling trust fund taxes. Withheld taxes are held in trust. Borrowing from them, even temporarily, is a serious violation.
Frequently Asked Questions
Q: What if I get an employee's withholding wrong?
A: Small errors usually correct themselves over a year or two as the employee gets refunds or owes a bit extra on their personal return. Large errors—say, not withholding any federal income tax—should be corrected immediately. Recalculate and adjust future paychecks.
Q: Do I have to use a payroll service, or can I do it myself?
A: You can do it yourself with payroll software. For a 1–3 person business with straightforward wages (no stock options, bonuses, or multiple states), software is affordable. Once you have more than five employees or complex compensation, a payroll service pays for itself in time saved and error avoidance.
Q: How do I know if I'm a semi-weekly depositor?
A: The IRS tells you based on your history. New employers are monthly. If your quarterly tax liability exceeds $50,000, they'll notify you to switch to semi-weekly. Check your IRS notice or ask your accountant.
Q: What happens if I miss a deposit deadline?
A: Penalties start at 2 percent and escalate. Worse, the IRS can come after you personally for unpaid trust fund taxes. This is worth automating or outsourcing to avoid.
Q: Can I use federal withholding for state withholding?
A: No. They're separate. Some states use the federal W-4 to calculate their withholding; others have their own forms and calculations. Check your state's rules.
Q: Do I withhold FICA taxes on tips?
A: Yes. Employees report tips to you, and you withhold Social Security and Medicare on the full amount (wages plus reported tips).
Q: What if my business is an S-corp or LLC—do the withholding rules change?
A: Business structure affects your personal tax return, not payroll withholding. Withholding rules are the same. (For more on how structure intersects with tax efficiency, see Dividend vs. Salary: The Most Tax-Efficient Way to Pay Yourself.)
Getting it right
Payroll tax compliance is one of the most critical responsibilities of a US employer. The silver lining: once you set it up correctly, it's routine. Use payroll software or a payroll service, integrate with your accounting system so you can track employment costs accurately, and set calendar reminders for quarterly filings.
Your state's Department of Labor has contact information for unemployment insurance and wage-hour questions. The SBA's tax guide covers the basics in plain language.
If payroll compliance feels overwhelming, a payroll service provider can handle calculations, deposits, and filings for $30–50 per month—well worth it for peace of mind and staying out of trouble with the IRS.