Self-Employment Tax Calculator

What Is Self-Employment Tax?

Self-employment tax is the Social Security and Medicare tax that self-employed individuals must pay on their net earnings. When you work for an employer, FICA taxes are split 50/50 between you and your employer — you each pay 7.65%. But when you are self-employed, you are both the employer and the employee, so you pay both halves — a combined 15.3%.

This tax applies to anyone who earns $400 or more in net self-employment income during the year. It covers freelancers, independent contractors, sole proprietors, gig workers, and anyone who receives a 1099-NEC instead of (or in addition to) a W-2. The self-employment tax is reported on Schedule SE and is separate from your federal income tax — meaning self-employed individuals effectively face a double tax burden compared to W-2 employees.

How Self-Employment Tax Is Calculated

The calculation involves several steps that can be confusing at first. Here is the complete process for 2026:

Step 1: Calculate Net Self-Employment Income

Start with your gross self-employment income and subtract all allowable business expenses (supplies, home office, mileage, software, marketing, professional services, etc.). The result is your net self-employment income. Only this net amount is subject to SE tax.

Step 2: Apply the 92.35% Factor

You only pay SE tax on 92.35% of your net self-employment income. This adjustment mirrors the fact that W-2 employees do not pay income tax on their employer's share of FICA. Multiply your net income by 0.9235 to get your SE tax base.

Step 3: Calculate Social Security Tax (12.4%)

Apply 12.4% to your SE tax base, up to the Social Security wage base of $176,100 for 2026. If your SE tax base exceeds this amount, the excess is not subject to Social Security tax — but it is still subject to Medicare tax.

Step 4: Calculate Medicare Tax (2.9% + 0.9%)

Apply 2.9% to the entire SE tax base with no cap. If your total income exceeds $200,000 (single) or $250,000 (married filing jointly), an additional 0.9% Medicare surtax applies to the excess amount.

Step 5: Add It All Up

Total SE tax = Social Security portion + Medicare portion + Additional Medicare (if applicable). You can then deduct half of this amount from your adjusted gross income on your 1040.

Worked Example: $100,000 Net Self-Employment Income

In this example, the self-employed person pays $14,129 in SE tax alone — before any federal income tax. A W-2 employee earning the same $100,000 would pay only $7,065 in FICA (their half), with the employer paying the other $7,065. This is why understanding SE tax is critical for freelancers and contractors.

The Deductible Half of SE Tax

One of the few tax breaks for self-employed individuals is the ability to deduct 50% of your self-employment tax from your adjusted gross income. This deduction is available even if you take the standard deduction — it is an "above the line" deduction on Schedule 1 of Form 1040.

This mirrors the fact that W-2 employees never pay income tax on their employer's share of FICA. The deduction reduces your AGI, which lowers your federal income tax and may also help you qualify for certain credits and deductions that phase out at higher income levels. However, this deduction does not reduce your SE tax itself — only your income tax.

Quarterly Estimated Tax Payments

Unlike W-2 employees who have taxes withheld every paycheck, self-employed individuals must make quarterly estimated tax payments using Form 1040-ES. The IRS expects you to pay taxes as you earn income throughout the year, not in one lump sum at filing time.

The quarterly due dates for 2026 are:

If you fail to pay enough estimated tax, the IRS charges an underpayment penalty. To avoid this, you must pay at least 90% of your current year's tax liability or 100% of last year's liability (110% if your AGI was over $150,000). Many self-employed individuals use the "safe harbor" method — paying 100% of last year's tax in equal quarterly installments — to avoid penalties regardless of how their income fluctuates.

SE Tax Rates by Income Level

Strategies to Reduce Self-Employment Tax

S-Corp Election: The Most Powerful Strategy

The most significant way to reduce SE tax is to elect S-Corporation status. As an S-Corp, you pay yourself a "reasonable salary" (subject to FICA) and take additional profits as distributions — which are not subject to self-employment tax. For example, if your business earns $150,000 and you pay yourself a $70,000 salary, only the $70,000 is subject to FICA/SE tax, potentially saving over $12,000 annually.

However, the S-Corp election comes with added costs: payroll processing, additional tax filings (Form 1120-S), and the requirement to pay a "reasonable" salary. The IRS scrutinizes salaries that are too low relative to the work performed. Generally, the S-Corp election becomes beneficial when net self-employment income exceeds approximately $50,000 to $60,000 per year.

Maximize Business Deductions

Every dollar of legitimate business expense reduces your net self-employment income and therefore your SE tax. Common deductions include:

• Home office deduction: Either the simplified method ($5/sq ft, max 300 sq ft = $1,500) or actual expense method (percentage of rent, utilities, insurance).
• Vehicle expenses: Standard mileage rate ($0.725/mile in 2026) or actual vehicle costs for business use.
• Health insurance premiums: Self-employed individuals can deduct 100% of health insurance premiums for themselves, their spouse, and dependents.
• Retirement contributions: SEP-IRA (up to 25% of net SE income, max $70,000), Solo 401(k) ($23,500 employee + 25% employer contribution), or SIMPLE IRA.
• Professional development: Courses, certifications, conferences, books, and subscriptions related to your business.
• Software and equipment: Section 179 allows immediate deduction of business equipment purchases up to $1,260,000 in 2026.

Retirement Accounts for Self-Employed

Self-employed retirement plans are doubly beneficial: they reduce both your income tax and your SE tax (because retirement contributions lower your net self-employment income for some plans). A Solo 401(k) allows the largest contributions — up to $70,000 in 2026 when combining employee and employer portions. This can dramatically reduce your total tax bill.

Schedule SE: Filing Requirements

You must file Schedule SE with your Form 1040 if your net self-employment income is $400 or more. The form calculates your SE tax and the deductible half. Key lines include:

• Line 4: Net self-employment income (from Schedule C or Schedule F)
• Line 4a: Multiply by 92.35% to get the SE tax base
• Line 10: Multiply by 15.3% (with Social Security cap) to get total SE tax
• Line 13: Deductible half — transfer to Schedule 1, Line 15

If you have both W-2 wages and self-employment income, your W-2 wages count toward the Social Security wage base first. So if your W-2 salary is $150,000, only $26,100 of your SE tax base is subject to Social Security tax ($176,100 - $150,000).

Common Mistakes Self-Employed Taxpayers Make

• Not making quarterly payments: The underpayment penalty can add 8-10% annually on the unpaid amount. Set up automatic quarterly payments using IRS Direct Pay or EFTPS.
• Missing legitimate deductions: Many freelancers overlook deductible expenses like internet bills, phone plans, professional memberships, and bank fees. Track every business expense throughout the year.
• Forgetting the SE tax deduction: The deductible half of SE tax is easy to overlook. Tax software usually catches this, but if you file manually, ensure you claim it on Schedule 1.
• Not separating personal and business finances: Mixing personal and business expenses makes tracking deductions difficult and raises red flags in an audit. Open a separate business checking account.
• Waiting too long for S-Corp election: If your net income consistently exceeds $60,000, you may be overpaying SE tax by thousands each year. Evaluate the S-Corp election annually.

Additional Medicare Tax for High Earners

Starting at $200,000 in net self-employment income for single filers ($250,000 for married filing jointly), an additional 0.9% Medicare surtax applies. This additional tax brings the Medicare portion from 2.9% to 3.8% on income above the threshold. Unlike the regular Medicare tax, this additional tax is only paid by the employee/self-employed individual — there is no employer match.

For high-earning self-employed individuals, the combined SE tax rate on income above $200,000 is 3.8% (Medicare only, since Social Security caps at $176,100). Combined with federal income tax at the 32-37% bracket, the total marginal rate can exceed 50% when including state taxes. This is a key reason why the S-Corp strategy becomes especially valuable at higher income levels. Check your overall burden with our effective tax rate calculator.

Related Tax Calculators

Self-employment tax is just one part of your total tax picture. These tools can help you plan your overall strategy:

• Income Tax Calculator — Estimate your full federal income tax liability including SE income.
• Effective Tax Rate Calculator — See your true overall tax burden as a percentage of income.
• Tax Bracket Calculator — Find your marginal tax bracket after accounting for the SE tax deduction.
• Paycheck Calculator — Compare your self-employed take-home with a W-2 equivalent salary.
• Bonus Tax Calculator — Calculate withholding if you receive both W-2 bonuses and SE income.