Curated by: Rubric Advisors
Tax Planning
Self-Employment Tax: What It Is, How It Works, and Ways to Reduce It
Self-employment tax covers Social Security and Medicare for freelancers and business owners. Learn how it's calculated, who owes it, and strategies to lower it.
Self-Employment Tax: What It Is, How It Works, and Ways to Reduce It
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What Self-Employment Tax Is
- SE tax covers Social Security (12.4%) and Medicare (2.9%), totaling 15.3% of net SE income
- W-2 employees split these taxes with their employer; self-employed pay both halves
- SE tax is separate from federal and state income tax, you may owe both on the same income
- The tax applies to net earnings of $400 or more from self-employment in a given year
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Full Guide
What Self-Employment Tax Is
- SE tax covers Social Security (12.4%) and Medicare (2.9%), totaling 15.3% of net SE income
- W-2 employees split these taxes with their employer; self-employed pay both halves
- SE tax is separate from federal and state income tax, you may owe both on the same income
- The tax applies to net earnings of $400 or more from self-employment in a given year
Who Pays and How It Is Calculated
- Sole proprietors, freelancers, independent contractors, gig workers, and most LLC members
- Start with net self-employment income, then multiply by 92.35% to mirror W-2 treatment
- Apply the 15.3% SE tax rate to the adjusted amount to determine the tax owed
- The Social Security portion (12.4%) applies only up to the annual wage base ($176,100 for 2025)
The Employer-Equivalent Deduction
- You can deduct half of your SE tax on Form 1040 as an above-the-line adjustment
- This deduction reduces adjusted gross income but does not reduce SE tax itself
- The deduction is available whether or not you itemize, it appears on Schedule 1
- This mirrors how W-2 employers deduct their share of payroll taxes as a business expense
Additional Medicare Tax for Higher Earners
- An extra 0.9% Medicare tax applies above $200K (single) or $250K (married filing jointly)
- This brings the total Medicare rate to 3.8% on income above the threshold
- There is no employer match on the additional Medicare tax, it falls entirely on you
- The threshold is not indexed for inflation, so more earners become subject over time
Quarterly Estimated Tax Payments
- Self-employed individuals must generally make quarterly payments to avoid penalties
- Due dates are April 15, June 15, September 15, and January 15 of the following year
- Estimated payments cover both income tax and SE tax, use Form 1040-ES to calculate
- Safe harbor: paying 100% of last year's tax (110% if AGI exceeds $150K) avoids penalties
Strategies to Reduce Self-Employment Tax
- S-Corp election splits income into salary (subject to SE tax) and distributions (not subject)
- Maximizing retirement contributions (SEP-IRA, Solo 401k) reduces taxable income
- HSA contributions lower adjusted gross income for eligible individuals
- Proper tracking of all legitimate business expenses reduces net SE income directly
Filing Requirements and Common Mistakes
- Schedule SE is filed with Form 1040; net SE income flows from Schedule C or K-1
- Many new freelancers budget only for income tax and face surprise SE tax bills
- Setting an unreasonably low S-Corp salary to minimize payroll taxes draws IRS scrutiny
- Missing quarterly payments can trigger penalties and interest charges
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