Executive Summary
Calling someone a contractor doesn't make them one. The IRS looks at the actual relationship using three categories of common-law control:
The most common payroll mistakes small businesses make are misclassifying workers, miscalculating overtime, missing tax deposit deadlines, using outdated withholding information, and keeping incomplete records.
Each one is preventable. Each one also gets more expensive the longer it goes unnoticed.
In fiscal year 2025, the U.S. Department of Labor's Wage and Hour Division recovered more than $259 million in back wages for nearly 177,000 workers. That's an average of $1,465 per worker, before any penalties or legal fees.
Here are the mistakes to watch for and how to fix them.
1. Misclassifying Employees as Independent Contractors
Calling someone a contractor doesn't make them one. The IRS looks at the actual relationship using three categories of common-law control:
- Behavioral control: do you direct how, when, and where the work gets done?
- Financial control: do you control their expenses, tools, and how they get paid?
- Relationship: is there a written contract, are there benefits, and is the work a core part of your business?
If you control the work the way you would an employee's, that person is likely an employee. Misclassify them and you can owe back payroll taxes, penalties, and back overtime.
How to avoid it: review every 1099 relationship against the IRS factors once a year. When in doubt, ask your CPA before the first payment.
2. Miscalculating Overtime
Under the Fair Labor Standards Act, non-exempt employees earn at least 1.5 times their regular rate for hours over 40 in a workweek. Three errors show up again and again:
- Treating an employee as exempt because they're salaried. Salary alone doesn't create an exemption. The job duties have to qualify too.
- Leaving bonuses and commissions out of the regular rate. Many non-discretionary bonuses must be included when you calculate overtime.
- Averaging hours across two weeks. Overtime is calculated per workweek. Thirty hours one week and fifty the next still means ten hours of overtime.
How to avoid it: document the exemption basis for every salaried role. Set your payroll system to calculate overtime by workweek and include eligible bonus pay.
3. Missing Payroll Tax Deposit Deadlines
Federal payroll tax deposits run on a monthly or semiweekly schedule, set by the IRS based on your tax liability during a lookback period. Missing the date triggers the failure-to-deposit penalty:
- 2% if the deposit is 1 to 5 days late
- 5% if it's 6 to 15 days late
- 10% if it's more than 15 days late
- 15% if it's still unpaid more than 10 days after an IRS notice
Withheld income tax and the employee share of Social Security and Medicare are trust fund taxes. If they go unpaid, the IRS can hold responsible individuals personally liable through the Trust Fund Recovery Penalty, which equals the full unpaid amount.
How to avoid it: confirm your deposit schedule each year. Put every deposit and filing date on one shared calendar with a named owner.
4. Using Outdated Employee Information
A missing or old Form W-4 leads to wrong federal withholding. An address change can shift state or local tax obligations. A remote employee who moves from Florida to Georgia suddenly needs state income tax withheld.
How to avoid it: collect a new W-4 and state withholding form at hire and whenever an employee reports a life change. Ask remote employees to confirm their work location at least once a year.
5. Forgetting State and Local Requirements
Federal rules are only the base layer. Most states add their own withholding returns, unemployment insurance filings, and new-hire reporting deadlines. Some cities and counties levy local wage taxes. Every new state you hire in adds a new registration and a new set of dates.
How to avoid it: register with each state's tax and labor agencies before the first paycheck in that state. Keep a list of every jurisdiction you file in and review it each quarter.
6. Mixing Up Payroll Processing and Payroll Tax Filing
Many businesses assume their software, bookkeeper, or CPA handles the filings. Sometimes each one assumes another does. Running payroll and filing payroll taxes are two separate jobs, and both need an owner. Read more in our guide to payroll processing vs. payroll tax filing.
How to avoid it: write down who handles each task, from payroll runs to quarterly Form 941 to year-end W-2s.
7. Keeping Incomplete Payroll Records
The Department of Labor requires employers to keep payroll records for at least three years and time cards for at least two. The IRS asks you to keep employment tax records for at least four years after the tax is due or paid. If you face an audit or a wage claim, those records are your defense.
How to avoid it: store pay records, time records, W-4s, and filed returns in one secure, organized system. Don't rely on one person's inbox.
8. Not Reconciling Payroll With Your Books
Payroll is often your largest expense. If your payroll reports don't match your general ledger, your profit and loss statement is wrong, and every decision built on it is too.
How to avoid it: reconcile payroll to your books every month. Compare wages, taxes, and benefits on your payroll reports against your accounting entries and bank activity. For the full picture, read how payroll and accounting work together in a growing business.
9. Running Payroll Without a Backup
If one person knows your payroll system and that person gets sick, quits, or takes a vacation, payday is at risk. Late paychecks damage trust fast.
How to avoid it: document every step of your payroll process. Make sure a second person, or a partner, can run it without guessing.
How Can a Small Business Prevent Payroll Mistakes?
Look at the list above. How many of those nine items have a named owner at your company today?
Most payroll errors share one cause: the work sits with someone who has a different full-time job. A founder runs payroll between sales calls. An office manager handles it on Fridays. Small errors build up until a notice arrives.
You have three practical fixes:
- Build a written payroll calendar with every pay date, deposit date, and filing deadline
- Reconcile payroll to your books every month
- Hand payroll to a dedicated professional whose full job is getting it right
How Does BELAY Help Small Businesses Avoid Payroll Mistakes?
BELAY Full-Service Payroll pairs you with a dedicated, U.S.-based Payroll Processor who manages every run, every filing, and every compliance update. Your Payroll Processor handles wage calculations, withholdings, direct deposit, federal, state, and local tax filings, new-hire reporting, ACA compliance, and multi-state payroll on ADP's platform.
You get one person who owns the work and answers when you call. Most clients are fully operational within a few weeks, and you can stay month-to-month.
Payroll connects to the rest of your finances, too. BELAY Financial Solutions includes eight services, including Bookkeeping to keep payroll reconciled to your books and Tax Services for year-round CPA support. If admin work is also eating your week, BELAY Assistant Solutions can match you with a dedicated Executive Assistant.
Book a fit call and find your right-fit Payroll Processor.
Related reading:
Frequently Asked Questions
What is the most common payroll mistake small businesses make?
Worker misclassification and overtime miscalculation are among the most common and costly. Both can lead to back wages, back taxes, and penalties. The Department of Labor recovered more than $259 million in back wages in fiscal year 2025.
What is the penalty for a late payroll tax deposit?
The IRS charges 2% of the unpaid deposit if it's 1 to 5 days late, 5% if 6 to 15 days late, 10% if more than 15 days late, and 15% if it remains unpaid more than 10 days after an IRS notice.
Can a business owner be personally liable for unpaid payroll taxes?
Yes. Through the Trust Fund Recovery Penalty, the IRS can hold responsible individuals personally liable for unpaid withheld income tax and the employee share of Social Security and Medicare.
How long should a business keep payroll records?
The Department of Labor requires at least three years for payroll records and two years for time cards. The IRS asks employers to keep employment tax records for at least four years after the tax is due or paid.
How do I fix a payroll mistake?
Correct the employee's pay in the next payroll run or with a separate check, update your records, and file any corrected tax forms, such as Form 941-X for federal quarterly returns. For complex errors, talk with your CPA or payroll provider before you file.
Should a small business outsource payroll?
Outsourcing makes sense when payroll takes time away from running the business, when you employ people in more than one state, or when no one on your team owns compliance. A dedicated payroll professional reduces the chance that deadlines and rule changes slip.
