5 Common Tax Mistakes Small Business Owners Make

Running a small business is hard enough without making avoidable tax mistakes. Here are five of the most common errors — and how to avoid them.

1. Not Paying Quarterly Estimated Taxes — If you expect to owe $1,000 or more in taxes, you're required to make quarterly estimated tax payments. Missing these payments results in underpayment penalties, even if you pay in full at tax time.

2. Mixing Personal and Business Finances — Using the same bank account for personal and business expenses makes bookkeeping a nightmare and increases your audit risk. Open a dedicated business checking account from day one.

3. Missing Deductible Expenses — Many small business owners miss legitimate deductions simply because they don't know they qualify. Home office, vehicle mileage, health insurance premiums, and retirement contributions are commonly overlooked.

4. Misclassifying Workers — Incorrectly classifying employees as independent contractors (or vice versa) can result in significant back taxes, penalties, and interest. The IRS has strict rules about worker classification.

5. Poor Record-Keeping — The IRS requires you to substantiate every deduction you claim. Without receipts, invoices, and records, you risk losing deductions in an audit. Use accounting software or a simple spreadsheet to track everything.