Summary

Self-employment tax is a required contribution to Social Security and Medicare for freelancers, contractors, and small-business owners who earn at least $400 in net earnings. Unlike traditional employees, self-employed individuals must cover both the employer and employee portions of these taxes, totaling 15.3% on most of their income. This article explains who owes the tax, how to calculate it, how and when to pay it, and what deductions are available.

🧾 What Is Self-Employment Tax?

Self-employment tax is the combination of Social Security and Medicare taxes that must be paid by individuals who work for themselves. It applies to 92.35% of net earnings — essentially, your profit after subtracting business expenses from your self-employment income. The total rate is 15.3%, which includes 12.4% for Social Security and 2.9% for Medicare. Unlike employees, who split this cost with their employer, self-employed workers are responsible for the full amount. You may also owe an extra 0.9% Medicare tax if your income exceeds certain thresholds.

Takeaways:

• Self-employment tax is 15.3% of net earnings.

• It applies to freelancers, contractors, and business owners with $400+ in annual net earnings.

• You pay the full employee and employer share of Social Security and Medicare taxes.

Key Terms

• Self-employment tax: A federal tax combining Social Security and Medicare for self-employed individuals.

• Net earnings: Income after deducting business expenses.

• Medicare tax: A federal tax funding health coverage for those over 65.

• Social Security tax: A federal tax funding retirement and disability benefits.

🧮 How to Calculate Self-Employment Tax

To calculate self-employment tax, begin by determining your net earnings, which are your total self-employment income minus eligible business expenses. Then multiply that result by 92.35% to find the portion subject to self-employment tax. Apply the 15.3% tax rate to that figure. Note that for 2025, only the first $176,100 of earnings is subject to the Social Security portion. Any amount above that is exempt from the 12.4% Social Security tax but may still be subject to Medicare tax, and an additional 0.9% Medicare tax could apply to high earners.

Takeaways:

• Use 92.35% of net earnings when applying the 15.3% tax rate.

• Only the first $176,100 of earnings is subject to the Social Security portion in 2025.

• Extra Medicare tax applies if your self-employment income is high.

Key Terms

• Schedule C: IRS form used to calculate net earnings from self-employment.

• Schedule SE: IRS form used to determine self-employment tax owed.

• Additional Medicare tax: An extra 0.9% Medicare tax for high-income individuals.

💰 How to Pay Self-Employment Tax

To pay your self-employment tax, you’ll complete IRS Schedule C and Schedule SE as part of your annual tax return. Payments are often due throughout the year as quarterly estimated payments if you expect to owe $1,000 or more in federal taxes. The IRS considers taxes to be a pay-as-you-go system, so waiting until tax time may lead to penalties. You must also provide your Social Security number or ITIN when making payments.

Takeaways:

• Self-employment tax is paid using IRS Schedules C and SE.

• You may need to make quarterly estimated payments.

• Delaying payment until year-end may result in penalties.

Key Terms

• Estimated tax: A method of paying taxes on income not subject to withholding.

• ITIN: Individual Taxpayer Identification Number used in place of an SSN for some taxpayers.

📉 Deductions for Self-Employment

One benefit of paying self-employment tax is that you can deduct up to 50% of the tax on your individual income tax return. For example, if you owe $2,000 in self-employment tax, $1,000 may be deductible when filing your 1040. In addition, self-employed individuals may qualify for the qualified business income deduction, allowing them to deduct up to 20% of their net income from taxes. Other common deductions include those for home office use, business expenses, and self-employed health insurance.

Takeaways:

• Up to 50% of your self-employment tax may be deductible.

• The qualified business income deduction can reduce your income tax.

• Additional deductions may apply for home office, insurance, and expenses.

Key Terms

• Qualified business income deduction: A tax deduction for up to 20% of qualified business income.

• 1040: The standard IRS income tax return form for individuals.

• Home office deduction: A tax break for using part of your home for business purposes.

Conclusion

Understanding self-employment tax is critical for freelancers, contractors, and small-business owners. Not only are you responsible for the full 15.3% tax, but you also need to plan your payments throughout the year to avoid penalties. Knowing how to calculate the tax and take advantage of available deductions can help you stay compliant and avoid surprises during tax season.