How to Calculate Payroll Taxes: A Step-by-Step Guide for Small Business Owners
If you have even one employee, you're responsible for calculating, withholding, and remitting payroll taxes—and getting it wrong can trigger penalties that start at 2% and climb to 15% of the amount owed. The good news is that payroll tax math is straightforward once you understand the pieces. This guide walks you through every federal payroll tax, shows you exactly how to calculate each one, and covers the state-level obligations you need to know about.
What Are Payroll Taxes?
"Payroll tax" isn't a single tax. It's an umbrella term for all the taxes tied to employee wages. Some are split between you and your employees, some you pay entirely on your own, and some you simply withhold from paychecks and forward to the government.
Here's the breakdown:
Taxes you share with employees:
- Social Security tax
- Medicare tax
Taxes you pay as the employer:
- Federal Unemployment Tax (FUTA)
- State Unemployment Tax (SUTA)
Taxes you withhold from employees:
- Federal income tax
- State and local income tax (where applicable)
Let's calculate each one.
FICA Taxes: Social Security and Medicare
FICA (Federal Insurance Contributions Act) is the biggest payroll tax for most businesses. It funds Social Security and Medicare, and it's split evenly between employer and employee.
2026 FICA Rates
| Tax | Employee Rate | Employer Rate | Combined |
|---|---|---|---|
| Social Security | 6.2% | 6.2% | 12.4% |
| Medicare | 1.45% | 1.45% | 2.9% |
| Total FICA | 7.65% | 7.65% | 15.3% |
Social Security Wage Base
Social Security tax only applies to the first $184,500 of each employee's wages in 2026 (up from $176,100 in 2025). Once an employee earns more than that, you both stop paying Social Security tax on the excess.
The maximum Social Security tax per employee in 2026 is $11,439 (6.2% × $184,500) for each side—employee and employer.
Medicare has no wage cap. Every dollar of wages is subject to the 1.45% Medicare tax.
Additional Medicare Tax
Employees earning over $200,000 per year owe an extra 0.9% Medicare tax on wages above that threshold. This is employee-only—you don't match it. But you are responsible for withholding it once an employee's year-to-date wages cross $200,000.
FICA Calculation Example
Say your employee earns $5,000 in gross pay for a semi-monthly pay period:
Employee's share:
- Social Security: $5,000 × 6.2% = $310
- Medicare: $5,000 × 1.45% = $72.50
- Total withheld: $382.50
Your share (employer):
- Social Security: $5,000 × 6.2% = $310
- Medicare: $5,000 × 1.45% = $72.50
- Total employer FICA: $382.50
Combined FICA cost for this pay period: $765
Federal Unemployment Tax (FUTA)
FUTA funds the federal unemployment insurance system. Unlike FICA, this is entirely an employer-paid tax—you never withhold FUTA from employee paychecks.
FUTA Rates and Wage Base
- Gross rate: 6.0%
- Wage base: First $7,000 of each employee's wages per year
- Effective rate: Most employers pay just 0.6% because you receive a 5.4% credit if your state unemployment taxes are paid in full and on time
FUTA Calculation Example
For an employee earning $50,000 per year:
- Taxable wages: $7,000 (only the first $7,000 counts)
- FUTA tax: $7,000 × 0.6% = $42 per year
That's it. Once the employee has earned $7,000 for the year, your FUTA obligation for that employee is done.
Maximum FUTA per employee: $42 per year (at the effective 0.6% rate)
State Unemployment Tax (SUTA)
Every state runs its own unemployment insurance program, and the rates vary dramatically.
What You Need to Know
- Rates range from under 0.5% to over 10%, depending on your state, industry, and claims history
- Wage bases range from $7,000 (matching the federal minimum) to over $68,500, depending on the state
- New employer rates are typically set at a standard rate for your first few years, then adjusted based on your experience (how many former employees file unemployment claims)
- Most states make this an employer-only tax. However, Alaska, New Jersey, and Pennsylvania also require employee contributions
How Your Rate Is Determined
States use an "experience rating" system. If your business has low turnover and few unemployment claims, you'll get a lower rate over time. High turnover and frequent claims push your rate higher. This is one financial reason (among many) to invest in employee retention.
Check your state's workforce or labor department website for your specific rate and wage base.
Federal Income Tax Withholding
You don't "pay" federal income tax for your employees—you withhold it from their paychecks and send it to the IRS. But calculating the correct amount is your responsibility.
What You Need
- Employee's W-4 form — This tells you their filing status, dependents, and any additional withholding they request
- IRS Publication 15-T — Contains the tax tables and calculation methods
- Employee's gross pay for the pay period
Two Calculation Methods
Wage Bracket Method: Look up the withholding amount in IRS tables based on filing status, pay frequency, and wage amount. This is the simplest approach for most small businesses.
Percentage Method: Use a formula to calculate withholding. This is more flexible and works for any wage amount, but it takes more steps.
Both methods produce similar results. Most payroll software uses the percentage method behind the scenes.
Quick Example (Wage Bracket Method)
An employee who is single, claims no dependents, and earns $4,000 biweekly would have approximately $400-$500 withheld for federal income tax (the exact amount depends on their specific W-4 selections). Consult the current IRS Publication 15-T tables for precise figures.
State and Local Income Taxes
If you operate in a state with income tax, you'll also need to withhold state income tax from employee paychecks. Some cities and counties add local income taxes on top of that.
States with no income tax (as of 2026): Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming.
For all other states, you'll need to register with the state tax authority and follow their withholding tables, which work similarly to the federal system.
Putting It All Together: Total Payroll Tax Cost
Let's calculate the full payroll tax picture for a small business with one employee earning $60,000 per year ($5,000/month):
Employer's Annual Cost
| Tax | Calculation | Annual Amount |
|---|---|---|
| Social Security (employer) | $60,000 × 6.2% | $3,720 |
| Medicare (employer) | $60,000 × 1.45% | $870 |
| FUTA | $7,000 × 0.6% | $42 |
| SUTA (example: 2.7% on $10,000 wage base) | $10,000 × 2.7% | $270 |
| Total employer payroll taxes | $4,902 |
That's roughly 8.2% on top of the salary you're already paying. For every $60,000 employee, budget about $4,900 in employer-side payroll taxes alone.
Employee's Annual Withholdings
| Tax | Calculation | Annual Amount |
|---|---|---|
| Social Security (employee) | $60,000 × 6.2% | $3,720 |
| Medicare (employee) | $60,000 × 1.45% | $870 |
| Federal income tax (estimated) | Varies by W-4 | ~$5,500 |
| State income tax (varies) | Depends on state | ~$2,400 |
| Total withheld from employee | ~$12,490 |
When to Deposit Payroll Taxes
Missing deposit deadlines triggers automatic penalties, so this matters.
Federal Tax Deposits (FICA + Federal Income Tax)
The IRS assigns you a deposit schedule based on your total tax liability during a "lookback period" (the four quarters ending June 30 of the prior year):
- Monthly depositor (≤$50,000 in the lookback period): Deposit by the 15th of the following month
- Semi-weekly depositor (>$50,000): Deposit within 3 business days after payday (Wednesday payday = deposit by Friday; Thursday/Friday payday = deposit by the following Wednesday)
- Next-day depositor ($100,000+ on any single day): Deposit by the next business day
Key Filing Deadlines
| Form | What It Covers | Due Date |
|---|---|---|
| Form 941 | Quarterly FICA + income tax | Last day of the month after the quarter ends |
| Form 940 | Annual FUTA | January 31 |
| W-2s | Employee wage statements | January 31 |
| State filings | SUTA and state withholding | Varies by state (typically quarterly) |
Penalties for Getting It Wrong
The IRS doesn't take payroll tax mistakes lightly. Here's what you're looking at:
- 1-5 days late: 2% penalty
- 6-15 days late: 5% penalty
- More than 15 days late: 10% penalty
- After IRS notice, still unpaid after 10 days: 15% penalty
- Late filing of Form 941: 5% per month, up to 25% of unpaid tax
- Trust Fund Recovery Penalty: The IRS can hold business owners personally liable for 100% of unpaid withholding taxes
That last one is critical. Unlike most business debts, payroll tax liability can follow you personally—even if your business is an LLC or corporation.
5 Common Payroll Tax Mistakes to Avoid
1. Misclassifying Workers
Treating employees as independent contractors to avoid payroll taxes is one of the most common—and most penalized—mistakes. If the IRS reclassifies your contractors as employees, you'll owe back taxes, penalties, and interest.
2. Missing the Wage Base Cutoffs
Forgetting to stop Social Security withholding after an employee hits the $184,500 wage base means you've over-withheld. You'll need to refund the employee and correct your filings.
3. Using Outdated Tax Tables
Tax rates and wage bases change annually. Using last year's numbers will throw off every calculation. Update your tax tables at the start of each year.
4. Forgetting About the Additional Medicare Tax
Once an employee crosses $200,000 in year-to-date wages, you must begin withholding the additional 0.9% Medicare tax. Missing this means you could be on the hook for the amount you should have withheld.
5. Ignoring State Obligations
Federal taxes get the most attention, but state unemployment tax, state income tax withholding, and local taxes all have their own rates, deadlines, and filing requirements. Falling behind on state obligations creates a separate set of penalties.
Self-Employment Tax: A Special Case
If you're a sole proprietor or freelancer, you pay both the employer and employee portions of FICA—a combined 15.3% on your net self-employment income. This is called self-employment tax.
The silver lining: you can deduct the employer-equivalent portion (7.65%) when calculating your adjusted gross income, which reduces your overall income tax.
Self-Employment Tax Calculation
Net self-employment income: $80,000
- Multiply by 92.35% (IRS adjustment): $80,000 × 0.9235 = $73,880
- Social Security: $73,880 × 12.4% = $9,161
- Medicare: $73,880 × 2.9% = $2,143
- Total self-employment tax: $11,304
- Deductible portion (half): $5,652
Simplify Your Payroll Tax Management
Calculating payroll taxes by hand is doable, but the combination of federal, state, and local obligations—each with their own rates, wage bases, and deadlines—makes it easy to slip up. Keeping clean, organized financial records is the foundation of accurate payroll tax compliance.
Beancount.io gives you plain-text accounting that makes your financial data completely transparent and version-controlled—no black boxes, no vendor lock-in. When every transaction is trackable and auditable, payroll tax time becomes far less stressful. Get started for free and take control of your business finances.
