The Freelancer's Guide to Self-Employment Taxes (2026)

Self-employment tax is the #1 surprise for new freelancers. Here's everything you need to know — the rate, how to pay quarterly, what you can deduct, and how to avoid the most common (and expensive) mistakes.

What Is Self-Employment Tax?

Self-employment (SE) tax is the freelancer version of FICA — the Social Security and Medicare taxes that employers and employees split. As a freelancer, you pay both halves.

• Employee half (7.65%): Your employer normally pays this. You now pay it.
• Employer half (7.65%): You pay this too. You're the boss.
• Total SE tax rate: 15.3%

The 15.3% breaks down as:

• 12.4% — Social Security (OASDI), capped at the first $176,100 of net earnings (2026 limit)
• 2.9% — Medicare (HI), no cap
• Additional 0.9% — Medicare surcharge for high earners ($200k single, $250k married)

Step-by-Step: How SE Tax Works

1. Calculate net earnings: Gross freelance income minus deductible business expenses.
2. Apply 92.35% rule: SE tax is calculated on 92.35% of your net earnings (not 100%).
3. Apply 15.3%: 12.4% up to the SS cap, then 2.9% on everything.
4. Deduct half: Half of your SE tax is deductible above the line (on Schedule 1, not Schedule C).

Real Example: $80,000 Freelancer

This is on top of your income tax. Our Freelance Lifestyle Calculator factors all of this into your minimum rate automatically.

Estimated Quarterly Payments

The IRS expects freelancers to pay quarterly (Form 1040-ES). Here's a rough guide based on net income:

*Estimates only. Consult a CPA.

2026 Solo 401(k) Limits

One of the biggest advantages freelancers have is the Solo 401(k):

That's a massive tax-advantaged savings opportunity. Every dollar you put in reduces your taxable income dollar-for-dollar.

Biggest Tax Deductions for Freelancers

• Home office deduction: $5/sqft simplified method (up to 300 sqft = $1,500) or actual expenses
• Health insurance premiums: 100% deductible above the line (for your plan and dependents)
• Retirement contributions: Solo 401k, SEP IRA, or SIMPLE IRA
• Equipment & software: Section 179 lets you deduct up to $1,220,000 in equipment immediately
• Vehicle expenses: 70¢/mile standard mileage rate (2026) or actual expenses
• Education & training: Courses, conferences, certifications, books — if it improves your freelance skills
• Internet & phone: Percentage used for business (keep a log)
• Meals & entertainment: 50% of business meals
• QBI Deduction: Up to 20% of qualified business income (phaseouts apply above $197,300 single)

Common SE Tax Mistakes

• No quarterly payments: The IRS charges penalties and interest. Pay as you go.
• Forgetting SE tax exists: Many freelancers save for income tax but forget the 15.3% SE tax on top. That's a 15.3% surprise.
• Missing the QBI deduction: 20% of business income could be tax-free if you qualify. Don't leave it on the table.
• Not using Solo 401k: Employees have access to 401k plans with matching. As a freelancer, your Solo 401k is your equivalent. Max it out.
• Mixing personal and business expenses: This makes tracking deductions much harder. Get a separate business account.

The Bottom Line

SE tax adds roughly 15% to your effective tax rate. On $80k, that's $11,304 extra. You need to charge enough to absorb this — or factor it into your rate.

Our calculator does this automatically. Enter the life you want, and it tells you the minimum rate after accounting for every tax and expense.