What Are the 3 Self-Employment Tax Mistakes Freelancers Make Every Week?

Three self-employment tax mistakes cost freelancers the most. They don't save for the 15.3% self-employment tax. They skip quarterly estimated payments. And they wait until March to track deductions. Each one has a simple fix you can start this week.

Run your own numbers: free self-employment tax calculator, 2026 rates.

At Toozi, we help freelancers and small business owners run their paperwork by text. We've had thousands of talks. The same three tax mistakes come up again and again. Here's what they are and how to avoid them.

1. Not Setting Aside Money for Self-Employment Tax

When you work for a company, your boss pays half of your Social Security and Medicare taxes. When you're self-employed, you pay both halves. That's 15.3% on top of your income tax. Most new freelancers don't know this until their first tax bill.

2. Missing Quarterly Estimated Tax Payments

The IRS wants self-employed people to pay taxes four times a year, not once. Miss a deadline, and you'll owe a penalty. That's true even if you pay it all by April 15. The quarterly deadlines are April 15, June 15, September 15, and January 15. They don't follow a clear pattern, so they're easy to forget.

3. Not Tracking Deductible Expenses in Real Time

The home office deduction, mileage, software, classes for your work. These add up. But most freelancers only think about deductions in March. By then, it's too late to remember what they spent in June.