Self-Employment Tax: How SE Taxes Work for Freelancers and Business Owners

The Tax That Surprises New Freelancers

In 2023, roughly 16 million Americans identified as self-employed — and many discovered their first year that their tax bill was far larger than expected. The reason is self-employment (SE) tax. Employees share Social Security and Medicare costs with employers, splitting a 15.3% combined rate in half. When someone works for themselves, they pay both halves — all 15.3% — on top of ordinary income tax. Understanding this mechanism is essential for any freelancer, gig worker, or independent business owner.

The 15.3% Rate Explained

Self-employment tax consists of two components, mirroring the employee/employer FICA split:

Once net self-employment income exceeds $168,600 in 2024, the 12.4% Social Security portion no longer applies. Medicare at 2.9% continues without cap. High earners — those with over $200,000 in net self-employment income ($250,000 for married filing jointly) — also pay an Additional Medicare Tax of 0.9% on income above those thresholds under the Affordable Care Act.

Calculating the SE Tax

The calculation involves three steps:

1. Calculate net self-employment income — Total business revenue minus deductible business expenses equals net profit from self-employment.
2. Multiply by 92.35% — Because employees don't pay FICA on the employer's share, the IRS lets self-employed filers reduce their net earnings by 7.65% before computing SE tax. The 92.35% factor (100% minus 7.65%) approximates the employee share.
3. Apply the 15.3% rate — SE tax = net earnings × 0.9235 × 0.153.

Example: A freelance designer with $70,000 in net profit pays SE tax of $70,000 × 0.9235 × 0.153 = approximately $9,887.

Deducting Half of SE Tax

The IRS allows self-employed individuals to deduct half of their SE tax from gross income when calculating adjusted gross income (AGI). This mirrors the tax treatment of employees, whose employer's half of FICA is not counted as employee income. The deduction appears on Schedule 1 of Form 1040 and reduces the amount of income subject to ordinary income tax — but not SE tax itself.

Quarterly Estimated Tax Payments

Self-employed individuals do not have an employer withholding taxes from paychecks. Instead, they must make quarterly estimated payments to avoid underpayment penalties.

To avoid penalties, estimated payments must cover at least 90% of the current year's tax liability or 100% of the prior year's tax liability (110% if prior-year AGI exceeded $150,000). The safe harbor at the prior-year amount is often the simpler approach for income that fluctuates.

Key Deductions for the Self-Employed

• SE tax deduction — 50% of SE tax deducted from gross income (as described above).
• Self-employed health insurance premiums — 100% of premiums for health, dental, and long-term care insurance paid for the self-employed person and their family are deductible from gross income (limited to net self-employment income).
• SEP-IRA, SIMPLE IRA, or Solo 401(k) contributions — Contributions reduce taxable income; in 2024, Solo 401(k) employee contributions can reach $23,000, with total contributions (employee + employer) up to $69,000.
• Home office deduction — Available for space used regularly and exclusively for business; calculated via simplified method ($5 per square foot, up to 300 sq ft) or actual expense method.
• Qualified Business Income (QBI) deduction — Non-corporate pass-through businesses may deduct up to 20% of qualified business income under Section 199A, subject to income thresholds and business type.

SE Tax for Different Business Structures

Sole proprietors and single-member LLCs taxed as disregarded entities report on Schedule C and pay SE tax on the full net profit. Partnerships allocate self-employment income to general partners. S-corporation shareholders who work in the business must pay themselves a reasonable salary subject to payroll taxes, but distributions above the salary are not subject to SE tax — making the S-corp structure attractive for higher-income self-employed individuals, at the cost of additional administrative complexity.

Form Schedule SE

SE tax is calculated and reported on Schedule SE (Form 1040), which is filed with the annual tax return. The IRS also offers a short form version for filers with straightforward situations. The resulting SE tax flows to Schedule 2 of the 1040 and is added to income tax owed.

This article is for informational purposes only and does not constitute financial advice.