Self Employment Tax SE Tax Calculator 2026

What Is the Self-Employment Tax and Why Does It Matter

If you work for yourself — as a freelancer, sole proprietor, independent contractor, or gig worker — you are responsible for paying self-employment (SE) tax. Unlike regular employees who split this cost with an employer, self-employed individuals pay the full amount on their own. Knowing what you owe before tax season arrives can save you from a costly surprise.

The SE tax covers both Social Security and Medicare contributions. For 2026, the combined rate is 15.3% applied to your net self-employment earnings. This calculator helps you figure out exactly how much you owe, including any additional Medicare surcharge and the deduction you can claim on your income tax return.

If you also make quarterly estimated payments, our Estimated Quarterly Tax Payment Calculator can help you stay on track throughout the year.

How to Use This Calculator

Step-by-Step Instructions

1. Enter your net self-employment profit — this is your business income after subtracting all allowable business expenses.
2. Enter any other W-2 wages or salary income you received during the year. This affects the Social Security wage base cap.
3. Select your filing status: Single, Married Filing Jointly, or Head of Household. This determines the threshold for the 0.9% Additional Medicare Tax.
4. Click the Calculate button to see your full SE tax breakdown.
5. Review the results including Social Security tax, Medicare tax, additional Medicare surcharge, total SE tax owed, and your 50% deduction.
6. Click Reset to start a new calculation.

The Formula Explained

The IRS uses a specific multi-step formula to calculate self-employment tax. It is not simply 15.3% of your gross profit. Understanding each step helps you plan better and avoid underpaying.

Breaking Down the Formula

Step 1: Multiply your net self-employment profit by 92.35% (0.9235). This adjustment accounts for the employer-equivalent deduction and gives you your net SE earnings.

Step 2: Apply 12.4% for Social Security on net SE earnings up to the annual wage base. For 2026 the wage base is estimated at $176,100. If your W-2 wages already used part of that base, only the remainder applies to your SE income.

Step 3: Apply 2.9% for Medicare on all net SE earnings — there is no cap on the Medicare portion.

Step 4: If your combined income from all sources exceeds $200,000 (single) or $250,000 (married filing jointly), an additional 0.9% Medicare surtax applies to the excess amount. You can read more about this surcharge on the IRS Topic 560 page.

Step 5: Add Social Security tax, Medicare tax, and any additional Medicare tax together to get your total SE tax. Then divide that total by two to find your 50% SE deduction — this reduces your adjusted gross income on your regular income tax return.

Example Calculation with Real Numbers

Suppose you are a freelance designer with $80,000 in net profit, no W-2 income, and you file as Single.

Net SE earnings: $80,000 x 0.9235 = $73,880. Social Security tax: $73,880 x 12.4% = $9,161. Medicare tax: $73,880 x 2.9% = $2,143. No additional Medicare applies since total income is below $200,000. Total SE tax: $11,304. Your deduction: $11,304 / 2 = $5,652.

When Would You Use This

Real Life Use Cases

This calculator is useful any time you earn income outside of a traditional employer-employee relationship. The need to pay SE tax applies broadly across dozens of work arrangements.

Specific Example Scenario

A real estate agent who earned $120,000 in commissions and also received $30,000 in W-2 wages from a part-time job would need to account for the partial Social Security wage base already used by the W-2 income. Running this through the calculator shows a lower SS tax than if they had earned everything through self-employment — a meaningful difference at that income level.

Similarly, a solo business owner considering their structure might compare SE tax with what they would pay under an S corporation arrangement. Our S Corp Reasonable Salary Calculator can help with that comparison. You may also want to review your contributions using the Solo 401k Contribution Calculator to offset taxable income.

Tips for Getting Accurate Results

Use Net Profit, Not Gross Revenue

The most common mistake is entering total revenue instead of net profit. SE tax is calculated on profit after business expenses — not on every dollar you earned. Deduct your business costs first, then enter what remains.

Include All Sources of Self-Employment Income

If you have income from multiple freelance clients, side businesses, or gig platforms, add all of it together before entering the total. The IRS looks at combined net SE income across all Schedule C activities. You can learn more about how self-employed individuals are taxed on the IRS website.

Account for W-2 Income When Applicable

If you also have a job that pays wages, enter that W-2 income in the second field. This prevents the calculator from over-charging Social Security tax on SE income when your employer already withheld SS from your wages earlier in the year.

Frequently Asked Questions

What is the SE tax rate for 2026?

The SE tax rate for 2026 is 15.3%, which breaks down into 12.4% for Social Security and 2.9% for Medicare. An additional 0.9% Medicare surtax applies to high earners above certain income thresholds.

What is the Social Security wage base for 2026?

The Social Security wage base for 2026 is estimated at $176,100. Only income up to this amount is subject to the 12.4% Social Security portion of SE tax. The Medicare portion has no cap.

Do I have to pay SE tax if my profit is very small?

You generally owe SE tax if your net self-employment earnings are $400 or more in a year. Below that threshold, SE tax does not apply, though you may still have other filing requirements.

Can I deduct the SE tax I pay?

Yes. You can deduct 50% of your total SE tax from your gross income as an above-the-line deduction on your Form 1040. This reduces your adjusted gross income and lowers your overall income tax bill.

What is the 92.35% figure used in the SE tax formula?

The 92.35% factor (equal to 1 minus 7.65%) mimics how employees receive the employer's deduction. It reduces your self-employment income slightly before the tax rate is applied, which prevents you from paying SE tax on the employer-equivalent portion of the SE tax itself.

How does SE tax differ from income tax?

SE tax is separate from federal income tax. SE tax specifically funds Social Security and Medicare. Income tax is calculated separately based on your taxable income and filing status. You may owe both in the same year.

Does my LLC affect SE tax?

If you operate as a single-member LLC and have not elected S corporation status, your business income is still treated as self-employment income and subject to SE tax. Electing S corp status can change how much of your income is subject to SE tax, but that decision involves other costs and requirements.

When do I pay SE tax?

SE tax is typically paid through quarterly estimated tax payments due in April, June, September, and January. If you wait until the annual filing deadline and have underpaid during the year, you may owe an underpayment penalty to the IRS.

Conclusion

Self-employment tax is one of the largest tax obligations for independent workers in the US. Knowing your SE tax liability in advance allows you to set aside the right amount, make accurate estimated payments, and plan your business finances more effectively.

Use this free 2026 SE Tax Calculator to get a fast and accurate estimate based on your actual income situation. Whether you are a freelancer, contractor, or small business owner, staying on top of your SE tax is one of the most important steps toward financial peace of mind.