7 tax types
involved in every payroll run: federal income tax withholding, Social Security (6.2% employee + 6.2% employer), Medicare (1.45% each), state income tax, state unemployment (SUTA), federal unemployment (FUTA), and local taxes where applicable
941 quarterly
IRS Form 941 is due quarterly (April 30, July 31, October 31, January 31) and reports total wages paid, federal income tax withheld, and the employer’s share of Social Security and Medicare: the most important payroll compliance filing for any employer
$50–$500/deposit
IRS penalty range for late payroll tax deposits: penalty percentage increases from 2% (1–5 days late) to 15% (10+ days late or after IRS notice) making timely tax remittance the highest-cost payroll error a small business can make
How Payroll Works: The Complete Picture for a Small Business
Payroll for a small business is the process of calculating each employee’s gross pay, withholding the correct taxes, remitting those taxes to federal, state, and local agencies on the required schedule, issuing net pay to employees via direct deposit or check, and filing the required payroll tax returns quarterly and annually. Each component has a specific legal deadline and a specific form. Missing any of them, a late tax deposit, an incorrect W-2, a missed quarterly 941, produces a penalty that the IRS assesses automatically without warning.
The mechanics of payroll are not complex in principle. They become complex in practice when multiplied across multiple employees. Multiple pay types (salary, hourly, overtime, bonuses), multiple states, and a calendar of deposit deadlines that varies by the size of your tax liability. Most small businesses arrive at a point where the time cost and error risk of manual payroll management exceeds the cost of a full-service payroll provider. And the IRS penalty history that follows the transition makes the case more clearly than any ROI calculation.
The most important distinction in payroll: tax deposits and tax returns are different things with different deadlinesA common small business payroll error is conflating the tax deposit (money sent to the IRS) with the tax return (Form 941). These are separate obligations. Tax deposits: remitting the withheld federal income tax and the combined employee/employer Social Security and Medicare taxes: must happen on either a monthly or semi-weekly schedule depending on your deposit history. Form 941, the quarterly return summarizing the deposits, is due after the quarter ends. An employer who files Form 941 on time but made deposits late has still incurred the deposit penalty. The deposit schedule is the compliance requirement that generates most small business payroll penalties.
Payroll Tax Obligations: What You Owe, When, and to Whom
| Tax type | Rate | Who pays | Deposit schedule | Annual filing |
|---|---|---|---|---|
| Federal income tax withholding | Varies by W-4 and earnings | Employee (withheld by employer) | Monthly or semi-weekly (IRS deposit schedule) | W-2 to employee. W-3 + W-2s to SSA by Jan 31 |
| Social Security tax | 6.2% employee + 6.2% employer = 12.4% combined | Split employer/employee | Monthly or semi-weekly with income tax deposit | Included in Form 941 quarterly. W-2 annually |
| Medicare tax | 1.45% employee + 1.45% employer = 2.9% combined | Split employer/employee | Monthly or semi-weekly with income tax deposit | Included in Form 941 quarterly. W-2 annually |
| Federal unemployment tax (FUTA) | 6% on first $7,000/employee (credit reduces to 0.6% if state taxes paid) | Employer only | Quarterly if liability exceeds $500 | Form 940 by January 31 |
| State income tax withholding | Varies by state (0%–13.3%) | Employee (withheld by employer) | Varies by state: monthly or quarterly | State W-2 equivalent. Varies by state |
| State unemployment tax (SUTA) | Varies by state and employer experience rating | Employer only | Quarterly | State unemployment return. Varies by state |
“Payroll is not just writing checks. It is a tax compliance function that runs on a calendar the IRS designed. The employer who understands the deposit schedule, the quarterly 941 deadline, and the annual W-2 deadline runs payroll as a system. The employer who treats payroll as “paying employees”. Discovers the system when the IRS sends a penalty notice.”
How to Do Payroll for a Small Business: Step-by-Step
- Register for a federal Employer Identification Number (EIN) and state employer accounts before the first payroll. Every employer needs a federal EIN (obtained free from IRS.gov in minutes) to file payroll tax returns. You also need a state employer account number for each state where you have employees: used for state income tax withholding deposits and state unemployment tax payments. State registration procedures vary but typically involve completing an online registration with the state department of revenue and the state workforce or unemployment agency. Without these account numbers, you cannot make tax deposits or file returns, and tax processing through any payroll system will be incomplete.
- Collect a completed W-4 from every employee before their first paycheck. The W-4 (Employee’s Withholding Certificate) tells you how much federal income tax to withhold from each employee’s paycheck. The 2020 redesigned W-4 eliminated allowances: employees now indicate their filing status, additional income sources, deductions, and any extra withholding they want taken. Use the IRS withholding tables (Publication 15-T) or payroll software to calculate the correct federal withholding based on each employee’s W-4. Also collect state-equivalent withholding forms for each state where the employee works, as state requirements vary from federal.
- Calculate gross pay, then work through each deduction type in the correct order. For a salaried employee, gross pay is the annual salary divided by the number of pay periods. For an hourly employee, gross pay is regular hours at base rate plus overtime hours at 1.5x rate for any hours over 40 in the workweek (FLSA requirement). From gross pay, deduct in this order: pre-tax deductions (401(k) contributions, health insurance premiums, HSA contributions) which reduce the taxable wage base. Then calculate and withhold mandatory taxes (federal income tax, Social Security, Medicare, state income tax). Then post-tax deductions (Roth 401(k), garnishments if applicable). Net pay is what remains after all deductions.
- Deposit payroll taxes on the IRS-required schedule: not when it is convenient. After running payroll, the combined employee/employer Social Security and Medicare taxes, plus withheld federal income tax, must be deposited with the IRS using the Electronic Federal Tax Payment System (EFTPS). New employers are monthly depositors: taxes from all payrolls in a calendar month are due by the 15th of the following month. Employers whose prior-year tax liability exceeded $50,000 are semi-weekly depositors with tighter deadlines. Check the IRS deposit schedule every year: your status can change. Make every deposit through EFTPS. Checks mailed to the IRS are not accepted for payroll tax deposits and generate automatic penalties.
- File Form 941 quarterly and issue W-2s by January 31 every year. Form 941 (Employer’s Quarterly Federal Tax Return) summarizes the wages you paid, the taxes you withheld, and the deposits you made each quarter. It is due on the last day of the month following each quarter end: April 30, July 31, October 31, and January 31. Separately, W-2 forms must be furnished to employees and filed with the Social Security Administration by January 31 each year. These are separate filings with separate deadlines: both are mandatory. Late W-2 penalties start at $60 per form and scale to $310 per form for intentional disregard. Both filings are handled automatically by full-service payroll software.
Tip: If you are processing payroll manually, the most important thing you can do is set calendar reminders for every deposit deadline 3 days in advanceMost small business payroll penalties are caused not by miscalculations but by missed deposit dates: the tax was calculated correctly but remitted late. If you are not yet using a payroll service that handles deposits automatically, create calendar reminders for: the 15th of each month (monthly depositor deposits), your semi-weekly deposit dates if applicable, quarterly 941 deadlines, and the January 31 W-2 deadline. Three-day advance reminders give you time to process the deposit through EFTPS before the deadline. This single habit prevents the most common and most expensive payroll error a small business owner makes.
Comparing payroll software that handles deposits, filings, and W-2s automatically?
