Self-Employment Tax Calculator 2026
Instantly calculate your SE tax, federal & state income tax, quarterly payments, and estimated take-home pay. Free for all 50 states.
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Total Self-Employment Tax
$0
Social Security (12.4%)
$0
Medicare (2.9%)
$0
Deductible Half
$0
Saves on income tax
Quarterly Payment
$0
Per quarter
Federal Income Tax
$0
State Tax (7.2%)
$0
Effective Tax Rate
0.0%
Estimated Take-Home
$0
⚠️ Disclaimer: This calculator is for estimation purposes only and does not constitute tax, legal, or financial advice. Tax laws change frequently. Always consult a qualified tax professional for advice specific to your situation.
What Is Self-Employment Tax?
Self-employment tax (SE tax) is the Social Security and Medicare tax that self-employed individuals must pay on their net earnings. Unlike W-2 employees who split these taxes 50/50 with their employer, self-employed workers are responsible for the full 15.3% rate. This tax applies to anyone earning $400 or more annually from self-employment activities.
The 15.3% SE tax rate comprises two parts: 12.4% for Social Security (capped at the annual wage base of $184,500 in 2026) and 2.9% for Medicare (with no income cap). High earners may also owe an Additional Medicare Tax of 0.9% on earnings exceeding $200,000 for single filers or $250,000 for married couples filing jointly.
How to Calculate Your Self-Employment Tax
The IRS uses a specific formula to calculate your SE tax. First, your net self-employment income is determined by subtracting business expenses from your gross income. Then, only 92.35% of this amount is subject to the SE tax — this percentage accounts for the employer-equivalent portion of the tax.
Here's the step-by-step formula:
- Net Income = Gross Income - Business Expenses
- Taxable Base = Net Income × 0.9235
- Social Security Tax = min(Taxable Base, $184,500) × 0.124
- Medicare Tax = Taxable Base × 0.029
- Total SE Tax = Social Security Tax + Medicare Tax
- Deductible Half = Total SE Tax × 0.5
The deductible half is important because it reduces your adjusted gross income (AGI), which in turn lowers your federal income tax. This is an "above-the-line" deduction that you can take regardless of whether you itemize.
Maximizing Deductions to Reduce SE Tax
One of the most effective ways to lower your self-employment tax is by maximizing your business deductions. Every dollar of legitimate business expense reduces both your income tax and your SE tax. Common deductions for self-employed individuals include:
- Home office expenses (simplified or actual method)
- Vehicle and mileage costs for business travel
- Health insurance premiums for you and your family
- Retirement plan contributions (SEP IRA, Solo 401k)
- Computer equipment, software, and tools
- Professional development and education
- Internet, phone, and utility bills (business percentage)
- Marketing, advertising, and website costs
Understanding Quarterly Estimated Payments
If you expect to owe $1,000 or more in federal taxes for the year, the IRS requires you to make quarterly estimated payments. These payments cover both your self-employment tax and your federal income tax. Missing these deadlines can result in underpayment penalties that add up quickly.
Use our quarterly tax calculator to determine exactly how much you should pay each quarter with the exact due dates.
State Tax Considerations
In addition to federal taxes, most states impose their own income tax on self-employment earnings. Our calculator covers all 50 states, including the nine states with no income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. If you live in one of these states, you can save significantly on your overall tax burden.