Running payroll should feel routine. You calculate hours, withhold taxes, and pay your employees on time.
In reality, payroll is one of the most error-prone parts of running a business. The IRS estimates that one-third of employers make payroll mistakes every year. In the last fiscal year alone, the agency assessed over 1.17 million penalties related to federal employment tax deposits, totaling nearly $19 billion. Those numbers can add up quickly, especially for growing companies trying to invest every dollar back into their business.
The good news is that most payroll mistakes are preventable once you know where to look. Here are four of the most common errors we see and practical steps you can take to avoid them.
1. Misclassifying Employees
Worker classification might seem like a technicality, but the IRS takes it seriously. The most common mistake is classifying someone as an independent contractor when they should legally be an employee.
The distinction matters because it affects how you withhold taxes and what you owe the government. When you classify someone as an independent contractor, you don’t withhold income taxes or pay the employer portion of Social Security and Medicare. But if the IRS later determines that person was actually an employee, your business can be held liable for employment taxes for that worker, including back taxes, penalties, and interest.
A related issue involves overtime eligibility. Under the Fair Labor Standards Act, employees must be classified as either exempt or non-exempt from overtime requirements. Labeling someone as exempt when their job duties don’t actually meet the criteria can lead to back pay claims and Department of Labor penalties.
How to avoid it: Before bringing on any worker, evaluate the relationship using the IRS guidelines. The IRS looks at three categories: behavioral control (do you control how the work gets done?), financial control (do you control the business aspects of the job?), and the nature of the relationship (is it ongoing, and is the work a key part of your business?).
If you’re uncertain about a specific worker, the IRS offers Form SS-8 to request an official determination. It’s also worth reviewing your current workforce periodically to make sure classifications still fit as roles evolve.
2. Employee Pay Errors
Pay errors happen more often than most business owners realize. These mistakes take many forms: entering the wrong number of hours, miscalculating deductions, forgetting to include a bonus or commission, or paying out the wrong amount of accrued PTO when someone leaves.
The consequences can be serious for everyone involved. In fiscal year 2025, the U.S. Department of Labor recovered $273 million in back wages for nearly 152,000 workers affected by pay violations. And those are just the cases that made it to federal investigators. For employees living paycheck to paycheck, even a small underpayment can mean a missed bill or an overdraft fee. Trust erodes quickly when people feel their employer can’t get the basics right.
How to avoid it: Build verification steps into your payroll process. Have a second person review calculations before payments go out. Keep employee records current, including tax withholding elections, direct deposit information, and benefit deductions. When someone leaves the company, use a checklist to make sure their final paycheck includes all outstanding wages, commissions, and accrued time off.
3. Overtime Calculation Mistakes
Federal law requires employers to pay non-exempt employees at least 1.5 times their regular rate for any hours worked over 40 in a workweek. That sounds straightforward, but there’s a catch: the “regular rate” isn’t always the same as someone’s base hourly wage.
Under the Fair Labor Standards Act (FLSA), the regular rate must include most forms of compensation the employee earned that week. That means commissions, shift differentials, and non-discretionary bonuses all need to be factored in before you calculate overtime. Many employers make the mistake of using only the base hourly rate, which results in underpayment.
Here’s an example: A sales associate earns $15 per hour and works 48 hours in a week. They also earn a $100 weekly commission. The correct regular rate calculation divides total compensation ($720 in wages plus $100 in commission) by total hours worked (48), which equals $17.08 per hour. The overtime premium should be calculated on that rate, not the $15 base rate.
Another common mistake involves exempt employee classification. To be exempt from overtime requirements, an employee must meet specific salary and duties tests. Simply paying someone a salary or giving them a managerial title doesn’t automatically make them exempt. If someone’s actual job duties don’t meet the exemption criteria, they’re entitled to overtime regardless of how you’ve classified them.
Employees can sue to recover back wages, and courts can award double the amount owed as liquidated damages. For repeated or willful violations, the Department of Labor can also impose civil penalties of up to $2,515 per violation.
How to avoid it: Review how you’re calculating overtime rates and make sure you’re including all required compensation. Audit your exempt employee classifications annually to verify they still meet the salary and duties tests under current regulations. If you operate in multiple states, pay close attention to state-specific rules. California, for instance, requires overtime pay for hours worked over eight in a single day, not just over 40 in a week.
4. Missing Tax Deadlines
Payroll taxes operate on strict schedules, and the IRS doesn’t offer much grace for late deposits. Depending on the size of your payroll, you may need to deposit withheld taxes monthly, semi-weekly, or even the next business day for large amounts.
The penalties for late deposits escalate quickly. If you’re one to five days late, the penalty is 2% of the unpaid tax. At six to 15 days late, it jumps to 5%. After 15 days, you’re looking at 10%. And if you still haven’t paid within 10 days of receiving an IRS notice, the penalty rises to 15%.
Beyond deposit deadlines, you also have filing deadlines for quarterly and annual returns like Form 941 and Form 940, plus distribution deadlines for employee W-2s and contractor 1099s. Missing these triggers additional penalties that range from $60 to $330 per form, depending on how late you file.
For business owners juggling multiple responsibilities, it’s easy to let a deadline slip, especially during busy seasons. But those penalties compound quickly and can create cash flow problems that make the next deadline even harder to meet.
How to avoid it: Set up calendar reminders for every payroll tax deadline, including deposits, quarterly filings, and annual forms. Many businesses find it helpful to maintain a separate bank account specifically for payroll taxes, so the money is always available when deposits come due. If you’re having trouble keeping up with deadlines, that’s often a sign it’s time to get help from someone who can manage payroll tax compliance full-time.
Simplifying Payroll With a Trusted Partner
Payroll mistakes are common, but they’re not inevitable. The businesses that avoid them usually have clear processes, consistent oversight, and someone to call when questions come up.
That’s what we do at Vested HR. We’re a Professional Employer Organization (PEO), which means we handle payroll processing, tax deposits, and compliance on your behalf. But unlike the big national providers, we treat our clients like family and we answer the phone with care. When you call us, you will not be routed through a call center; you get a real person who knows your business and is ready to help.
If payroll has become a source of stress rather than a routine task, we’d love to talk about how we can support your people and simplify your HR. Reach out to our team to learn more about what joining the Vested HR community looks like.