Self Employment Tax for Contractors: Your 2026 Guide to Calculating It and Paying Less

In 1989, a Milwaukee lawyer named Joseph Radtke paid himself a base salary of zero from his professional corporation. When the bank account had money, he declared a dividend instead. The court held that those payments were wages for real work, subject to employment tax (Radtke v. United States, 712 F. Supp. 143). The line drawn that year is still the line today: if you do real work for a business you own, the government wants its Social Security and Medicare cut. For you, that cut is self employment tax for contractors — the price of being your own boss instead of someone's W-2 employee. The tax code gives you several legal ways to reduce that cost, and I'll walk you through every one that actually works for a trade contractor.

This is part of a broader set of contractor tax planning strategies I walk trade contractors through — but this page focuses on one thing: the self-employment tax itself, how it's calculated, and what you can do about it.

What is self employment tax for contractors?

Self employment tax is the Social Security and Medicare tax you pay on business profit — both halves, because you're the employer and the employee (IRC §1401). When you work a W-2 job, your employer pays half the FICA and withholds the other half from your check. When you're self-employed, you are both sides of that equation, so you pay the full 15.3% yourself.

The 15.3% breaks down into two parts for 2026. The Social Security piece is 12.4%, and it applies to your earnings up to the wage base. That line is $184,500 in 2026. It was $176,100 the year before (SSA 2026 Fact Sheet). The Medicare piece is 2.9%, and it has no cap — it applies to every dollar of net profit.

That 15.3% is separate from income tax. You pay SE tax on your business profit, and then you pay income tax on top of that. They are two different taxes stacked on the same dollars. The one break is that you get to deduct half of your SE tax from your income before calculating your adjusted gross income, which softens the income tax side of the stack.

How do I calculate my self employment tax for 2026?

The calculation runs through Schedule SE, and it starts with one number: your net profit from Schedule C. If you run your contracting business as a sole proprietor or a single-member LLC that hasn't elected S-corp status, your profit lands on Schedule C and flows straight into the SE tax formula under IRC §1402.

The step-by-step runs like this, using a real example: a plumbing contractor with $80,000 of net profit after all business expenses.

Start with the $80,000 net profit from Schedule C. Multiply it by 92.35% under IRC §1402(a)(12). That gives you $73,880 of self-employment income. The 92.35% multiplier exists because the tax code lets you subtract the employer-equivalent portion of your SE tax before calculating the tax itself, which roughly mirrors the deduction a W-2 employer gets.

The 2026 Social Security wage base is $184,500. Your $73,880 of SE income is well under that line. So the full 15.3% rate applies.

Take that $73,880 of SE income. Apply the 15.3% rate. That gives you $11,304 in self-employment tax. That's the number that goes on your return.

Now the deduction. Half of the $11,304 comes off your income. That's $5,652 you subtract on Schedule 1 before you calculate your adjusted gross income. It doesn't reduce the SE tax itself — you still owe the full $11,304 — but it lowers the income your tax brackets apply to.

If your net profit is high enough to clear the wage base, the math changes above $184,500. A roofing contractor with $200,000 of net profit hits a different calculation. The first $184,500 of SE income gets the full 15.3% rate. Everything above that gets only the 2.9% Medicare rate. So the marginal rate on profit above the wage base drops from 15.3% to 2.9%, which is one reason high-earning contractors start looking at entity structuring.

What income does self employment tax apply to?

SE tax applies to net business profit, not gross receipts. If you're a sole proprietor or a single-member LLC taxed as a disregarded entity, your net profit from Schedule C is the number that feeds Schedule SE. Materials, subcontractor payments, equipment costs, vehicle expenses, insurance — all of that comes off the top before SE tax is calculated. You're taxed on what's left, not on what came in the door.

If you operate as a multi-member LLC taxed as a partnership, the mechanism is different but the result is the same. The partnership files Form 1065 and issues you a K-1. Your share of the partnership's net earnings from self-employment appears in Box 14 of that K-1 with code A, and it flows to Schedule SE the same way Schedule C profit does. The partnership itself doesn't pay the SE tax — you do, on your personal return, because the business is a pass-through.

One thing SE tax does not apply to: investment income. If you have rental income, dividend income, or capital gains, none of that hits Schedule SE. Only your earned income from working in the business is subject to the tax.

Can an S-corp election reduce my self employment tax?

Yes — and for profitable contractors, this is the single biggest legal reduction available. When you elect S-corp status by filing Form 2553, your business profit splits into two streams: W-2 wages and distributions.

The mechanics work like this. You pay yourself a salary through payroll. That salary is subject to FICA — both halves, just like any W-2 employee. But the remaining profit, taken as distributions, is not subject to SE tax at all. It passes through to your personal return as ordinary income, subject to income tax but not to the 15.3% SE tax. That's the savings.

Take that same plumbing contractor at $80,000 net profit. As a sole proprietor, the full $80,000 flows through Schedule SE and generates roughly $11,304 in SE tax. Now elect S-corp status and pay yourself a salary of roughly $27,000 — about one-third of net profit, which in my experience representing contractors in audits is the level that consistently holds up as reasonable compensation. The remaining $53,000 comes as distributions.

That $27,000 salary goes through payroll. The FICA tax on it is roughly $4,131 — both halves of 15.3%. The $53,000 in distributions generates zero SE tax. The total employment tax is now $4,131. That's a drop from the $11,304 you'd owe as a sole proprietor. The savings is about $7,173 per year.

That savings isn't free. An S-corp requires running actual payroll, filing quarterly payroll returns, a separate business tax return (Form 1120-S), and often higher tax-prep fees. In my experience, the S-corp election starts making sense at consistent net profit around $80,000 to $100,000 per year. Below that, payroll, tax-prep, and state compliance costs eat the savings. Above it, the savings grow faster than the fixed costs. You can dig deeper into that decision in our LLC vs S-Corp for Contractors comparison and our breakdown of when the S-corp income trigger hits.

The one non-negotiable, tracing straight back to Radtke: you must pay yourself a real salary. Zero salary for real work never survives. Any reasonable salary at all puts you in a fundamentally different category than Joseph Radtke. Everything above zero-and-defensible is planning, not evasion. If you want to see the exact numbers for your situation, the calculator below runs the comparison.

What other deductions reduce self employment tax?

SE tax is calculated on net profit, so every legitimate business expense you deduct on Schedule C reduces it indirectly. The tax code's test for a business expense is ordinary and necessary. Every dollar of deductible expense drops your net profit, which drops your SE income, which drops your SE tax.

Retirement contributions are the other major lever. A SEP IRA lets you contribute up to $72,000 in 2026 (IRC §415(c)). The contribution is also limited to 25% of your compensation, whichever is less. A Solo 401(k) lets you contribute up to $24,500 as the employee elective deferral. On top of that, an employer profit-sharing contribution brings the combined limit to $72,000. Both reduce your income tax. Neither reduces your SE tax directly — retirement contributions come off your return after SE tax is already calculated — but they reduce your overall tax burden substantially. You can compare the two in our breakdown of SEP-IRA vs Solo 401(k) for self-employed contractors.

The QBI deduction also does not reduce SE tax. It reduces income tax only. The 2025 tax law made the QBI deduction permanent, and the SE-tax framework described above remains in effect for 2026 (IRS OBBBA Provisions). For 2026, the QBI threshold for single filers is $201,750. For married filing jointly, it's $403,500. Below those thresholds, the full 20% deduction applies with no complications.

How much should I set aside for self employment tax?

My standing advice to trade contractors: sweep 25 to 30 cents of every net dollar into a separate tax account the day you take the draw. In a no-income-tax state, 25% covers SE tax plus income tax for most profit levels. In California, use 30% because the state income tax layer is significant. In an unusually profitable year, push to 35% or more because higher profit pushes you into higher brackets.

That percentage always applies to net, never gross. If you gross $150,000 on jobs but net $60,000 after materials, subs, and overhead, you set aside 25% to 30% of the $60,000 — not the $150,000. The SE tax and income tax both apply to profit, not revenue. For a deeper breakdown, see our guide on how much to set aside for taxes as a contractor.

Because no employer withholds for you, you pay estimated taxes on a quarterly schedule. The four deadlines are:

• April 15
• June 15
• September 15
• January 15

Hit the safe harbor and you avoid the underpayment penalty. The simplest safe harbor under IRC §6654(d): pay 100% of last year's total tax liability across the four quarterly payments. If your adjusted gross income was over $150,000, the target steps up to 110%. Our guide to how to pay quarterly taxes as a contractor walks through the mechanics step by step.

Does my entity type change how I pay self employment tax?

Your entity type determines the mechanism, not whether you pay. Each common contractor structure handles it differently.

• Sole proprietorship: Net profit from Schedule C flows to Schedule SE. You pay the full 15.3% on net profit up to the wage base, 2.9% above it. This is the default — no election required.
• Single-member LLC (default taxation): Identical to a sole proprietorship for federal tax purposes. The LLC gives you liability protection under state law, but the IRS treats it as a disregarded entity. Schedule C, then Schedule SE.
• Single-member LLC with S-corp election: You file Form 2553, run payroll, pay FICA on your W-2 wages, and take the rest as distributions free of SE tax. The salary must be reasonable compensation.
• Multi-member LLC (partnership taxation): The LLC files Form 1065 and issues K-1s. Your share of net earnings from self-employment flows from Box 14 of the K-1 to Schedule SE. Same 15.3% / 2.9% structure applies.
• Multi-member LLC with S-corp election: Same split as the single-member S-corp — wages subject to FICA, distributions free of SE tax — but with multiple owners, each owner's salary and distribution must be set independently and reasonably.

If you're weighing which structure fits your operation, the decision crosses over into how you pay yourself and how you handle crew classification. Our guides on how to pay yourself as a contractor and whether to hire employees or use 1099 subcontractors cover those angles.

Want a second set of eyes on your SE tax plan?

If you're staring at a profit number and trying to figure out whether an S-corp election, a retirement contribution, or a different entity structure would cut your tax bill, that's exactly what our office does. Book a meeting with our team and we'll run the numbers for your specific situation — real wages, real distributions, real savings.