Payroll feels like a back-office task until something goes wrong. Then it becomes the most expensive problem in your business — IRS penalties, angry employees, and state agencies that don’t accept “I didn’t know” as an excuse.
Here are the seven mistakes that catch owners most often.
1. Misclassifying employees as contractors
If you control how and when someone works, they’re an employee — not a 1099 contractor — no matter what your agreement says. Misclassification penalties include back taxes, interest, and fines that can wipe out a year of profit.
2. Missing payroll tax deposits
Federal payroll taxes are due on a strict schedule (semi-weekly or monthly depending on your size). Late deposits trigger penalties of 2–15% of the amount owed. Use a payroll service that auto-files; the $50/month is the cheapest insurance you’ll ever buy.
3. Forgetting state and local taxes
Federal payroll is just the start. States have their own withholding, unemployment, and sometimes disability taxes. Cities like NYC and San Francisco add another layer. Each one has its own deadlines.
4. Paying owners incorrectly
S-corp owners must take a “reasonable salary” through payroll before taking distributions. Skipping the salary to dodge payroll tax is one of the IRS’s favorite audit targets.
5. Mishandling overtime
Most non-exempt employees must be paid 1.5× their regular rate over 40 hours per week. Salary alone doesn’t make someone exempt — there are specific duties tests. Get this wrong and you owe back wages plus penalties.
6. Losing time records
The Department of Labor requires you to keep time and pay records for at least three years. If an employee files a wage complaint and you can’t produce records, the agency typically sides with the employee.
7. DIY-ing it past 5 employees
Manual payroll for one or two people is fine. Past that, the time and risk no longer make sense. Gusto, ADP, or QuickBooks Payroll handle filings, deposits, and W-2s automatically for less than the cost of a single mistake.
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