What Payroll Taxes Are and Why They Matter to Your Business

Payroll taxes are the federal, state, and local taxes your business withholds from employee paychecks and pays to the government on behalf of those employees. Your business also pays its own share of certain taxes. These are not optional — they are required by law, and the IRS tracks them closely. If you do not calculate and pay them correctly, your business faces penalties, interest, and potential legal action.

The taxes fall into two categories: those you withhold from employee pay, and those your business pays directly. Understanding which is which, and how much each one costs, is the foundation of payroll management. Most small businesses use payroll software or a payroll service to handle the math, but knowing how the calculation works helps you catch errors and understand what you owe.

Key Takeaways

  • You must withhold federal income tax, Social Security tax (6.2%), and Medicare tax (1.45%) from every employee paycheck, then send that money to the IRS.
  • Your business also pays a matching 6.2% Social Security tax and 1.45% Medicare tax for each employee, separate from what you withhold.
  • Federal Unemployment Tax (FUTA) is paid only by the employer at 6% on the first $7,000 of each employee's annual wages, though most states offer a credit that reduces this to 0.6%.
  • State and local payroll taxes vary by location and may include income tax withholding, unemployment insurance, disability insurance, or other taxes specific to your state.
  • You must deposit withheld taxes on a schedule set by the IRS — usually monthly or semi-weekly — and file quarterly and annual reports to reconcile what you paid against what you owe.

The Two Taxes You Withhold From Employee Paychecks

Federal income tax withholding is the amount you deduct from each paycheck based on the employee's W-4 form and their gross pay. The employee fills out the W-4 when hired, claiming dependents and indicating whether they want extra withheld. You use IRS tables or software to calculate the exact amount. This money belongs to the employee's future tax bill — you are holding it and sending it to the IRS on their behalf.

Social Security and Medicare taxes are fixed percentages you must withhold. Social Security is 6.2% of gross pay (up to a wage cap that changes yearly — in 2024 it was $168,600). Medicare is 1.45% of all gross pay with no cap. These are called FICA taxes. You withhold them from the employee's check, then send the total to the IRS along with your employer match (see below). The employee sees these as "FICA" or "Social Security" and "Medicare" on their pay stub.

The employee's total withholding is federal income tax plus 6.2% plus 1.45%. For example, an employee earning $2,000 per pay period might have $250 in federal income tax withheld, $124 in Social Security, and $29 in Medicare — a total of $403 withheld, leaving them $1,597 in net pay.

The Taxes Your Business Pays as the Employer

Beyond withholding, your business pays its own payroll taxes. These are business expenses, not deductions from employee pay. Employer Social Security tax is 6.2% of each employee's gross pay (same wage cap as the employee withholding). Employer Medicare tax is 1.45% of all gross pay with no cap. You pay these in addition to what you withheld from the employee.

Federal Unemployment Tax (FUTA) is paid only by the employer. The standard rate is 6% of the first $7,000 of each employee's annual wages. However, most employers receive a credit of up to 5.4% if they pay state unemployment insurance on time, bringing the effective federal rate down to 0.6%. This means you typically pay $42 per employee per year in federal unemployment tax (0.6% × $7,000), though the full 6% applies if you do not pay state unemployment or if your state has not received the credit.

Some states also impose an Additional Medicare Tax of 0.9% on employees earning over a threshold (usually $200,000 for single filers). If your employee crosses that threshold, you withhold the extra 0.9% and send it to the IRS. Your business does not pay a matching share of this tax.

State and Local Payroll Taxes Vary by Location

In addition to federal taxes, most states require payroll tax withholding and employer contributions. State income tax withholding works like federal withholding — the employee fills out a state W-4, and you deduct a percentage from each check. However, not all states have income tax. Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, and Wyoming have no state income tax. New Hampshire and Tennessee tax only dividend and interest income, not wages.

State Unemployment Insurance (SUI) is required in all states except South Dakota. You pay a percentage of each employee's wages (rates vary by state and industry, typically 0.5% to 5.5%) into a state fund. Some states also require employees to contribute. Your state will send you a rate notice each year showing what you owe.

Some states impose additional taxes: State Disability Insurance (SDI) in California, New Jersey, New York, and Rhode Island; Paid Family Leave taxes in California, New Jersey, New York, and Washington; and Local payroll taxes in cities like Philadelphia, Pittsburgh, and Washington, D.C. Each has its own rate and withholding rules. You must research your specific state and city requirements or use payroll software that handles them automatically.

How to Calculate Gross Pay and Apply Tax Rates

Start with gross pay — the total amount owed before any deductions. This is hours worked times hourly rate, or salary divided by pay periods. For a salaried employee earning $52,000 per year paid bi-weekly, gross pay per check is $2,000.

From gross pay, calculate withholdings in this order: federal income tax (using the W-4 and IRS tables), Social Security (6.2% up to the wage cap), Medicare (1.45%), state income tax (if applicable), and any other state or local taxes. Subtract these from gross pay to get net pay — what the employee actually receives.

Your business then owes, separately, the employer share of Social Security (6.2%), Medicare (1.45%), FUTA (0.6% typically), and state unemployment insurance. These are not deducted from the employee's check; they are business expenses you pay from company funds. Using the $2,000 example above, your employer taxes would be $124 (Social Security) + $29 (Medicare) + $12 (FUTA, assuming 0.6%) = $165 per pay period, or about $4,290 per year for that one employee.

When and How to Deposit and Report Payroll Taxes

The IRS requires you to deposit withheld taxes and employer taxes on a schedule based on how much you owe. Most small businesses deposit monthly — taxes withheld and owed in one month are due by the 15th of the following month. Larger employers deposit semi-weekly — taxes are due either Wednesday or Friday depending on the day you pay employees. The IRS will notify you of your deposit schedule based on your tax liability.

You deposit federal taxes using the Electronic Federal Tax Payment System (EFTPS) or through your bank. You cannot mail a check to the IRS for payroll taxes. State and local taxes have their own deposit systems — some allow online payment, others require checks mailed to a specific address. Your state tax agency will provide instructions.

At the end of each quarter, you file Form 941 (Employer's Quarterly Federal Tax Return), which reconciles the taxes you withheld and paid against what you actually owe. At the end of the year, you file Form 940 (Employer's Annual Federal Unemployment Tax Return) for FUTA, and you provide each employee with a W-2 (Wage and Tax Statement) showing their gross pay and all taxes withheld. You also file a copy of the W-2 with the Social Security Administration. State and local agencies have their own annual reconciliation forms.

Common Mistakes and How to Avoid Them

The most common error is misclassifying workers as independent contractors when they should be employees. Contractors do not trigger payroll taxes — you issue them a 1099 instead. But if the IRS determines a contractor was actually an employee, you owe back taxes, penalties, and interest. The IRS uses a three-part test: behavioral control (do you direct how the work is done?), financial control (do you provide tools and set pay?), and relationship (is it ongoing?). When in doubt, treat the person as an employee.

Another frequent mistake is failing to update W-4 forms when tax law changes. The IRS redesigned the W-4 in 2020, and many employees never updated theirs. If an employee claims too many dependents, you withhold too little, and they owe money at tax time — or worse, the IRS penalizes them. Encourage employees to review their W-4 annually, especially after major life changes.

Depositing late or underpaying is costly. The IRS charges a penalty of 2% to 15% of the unpaid amount, depending on how late you are. If you cannot pay in full, contact the IRS to set up a payment plan rather than ignoring the bill. Payroll software with automatic deposit reminders can prevent this.

Frequently Asked Questions

Do I have to use payroll software, or can I calculate taxes by hand?

You can calculate by hand using IRS tax tables and your state's withholding tables, but it is error-prone and time-consuming. Most businesses use payroll software (QuickBooks, Gusto, ADP, Paychex) or hire a payroll service. The cost is usually $30 to $100 per month for small businesses and is worth the accuracy and time saved. Software also tracks wage caps, updates tax rates automatically, and generates required reports.

What happens if I make a mistake on a paycheck?

If you withheld too much, the employee gets a refund when they file their tax return. If you withheld too little, they owe money at tax time. If you underpaid your employer taxes to the IRS, you owe the unpaid amount plus penalties and interest. File an amended Form 941 or 940 as soon as you discover the error, and contact the IRS to discuss payment options. The sooner you correct it, the smaller the penalty.

Do I have to pay payroll taxes if my business has no profit?

Yes. Payroll taxes are owed based on wages paid, not on business profit. If you pay an employee $30,000 per year, you owe payroll taxes on that $30,000 even if your business loses money overall. However, you can deduct payroll taxes as a business expense, which reduces your taxable income.

What if an employee works in multiple states?

You withhold state income tax for the state where the employee works, not where they live. If an employee works part of the year in one state and part in another, you withhold for each state based on the wages earned there. Some states have reciprocal agreements that simplify this — for example, Pennsylvania residents working in New Jersey may not owe New Jersey income tax. Check your state's rules or ask your payroll provider.

Can I pay payroll taxes annually instead of monthly or semi-weekly?

No. The IRS sets the deposit schedule, and you must follow it. If you owe less than $2,500 in total payroll taxes for a quarter, you can pay with your quarterly Form 941 filing, but you still cannot wait until the end of the year. Missing a deposit deadline triggers penalties immediately.