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IRS Schedule SE: How to Calculate Self-Employment Tax
Understand the 15.3% self-employment tax for freelancers and sole proprietors, including how Schedule SE works, the Social Security wage base.
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Understand the 15.3% self-employment tax for freelancers and sole proprietors, including how Schedule SE works, the Social Security wage base.
This guide is designed for first-pass understanding. Start with core terms, then apply the framework in your own account workflow.
Schedule SE is the IRS form used to calculate self-employment tax; the Social Security and Medicare taxes that self-employed individuals owe on their net earnings. Unlike traditional employees, who split these taxes with their employer (each paying 7.65%), self-employed workers pay both halves; a combined 15.3% rate that represents one of the biggest tax surprises for new freelancers, gig workers, and small business owners. Understanding Schedule SE is essential because self-employment tax often exceeds income tax for lower and middle-income self-employed workers.
Self-employment tax traces back to the Self-Employment Contributions Act of 1954 (SECA), which extended Social Security and Medicare coverage to self-employed individuals. Before SECA, self-employed workers didn't participate in Social Security; meaning they wouldn't receive retirement benefits, disability insurance, or Medicare coverage earned through the system.
The logic behind the 15.3% rate is straightforward: when you work for an employer, the employer pays 7.65% (6.2% Social Security + 1.45% Medicare) and withholds 7.65% from your paycheck. When you're self-employed, there is no employer; so you pay both portions. The IRS frames this as the "employer equivalent" and the "employee equivalent" of FICA taxes.
Over the decades, the rates and wage bases have increased significantly. The Social Security rate was just 2.25% (total) when self-employment tax was introduced. Medicare was added in 1966, and the combined rate has been at 15.3% since 1990. The Affordable Care Act of 2010 added the Additional Medicare Tax of 0.9% on self-employment income exceeding $200,000 (single) or $250,000 (married filing jointly), pushing the total rate above 16% for high earners.
The gig economy explosion has made Schedule SE relevant to millions of workers who might not consider themselves "business owners." Uber drivers, Etsy sellers, freelance writers, and DoorDash delivery workers all owe self-employment tax on their net earnings; a fact that catches many first-time filers off guard.
You must file Schedule SE if your net self-employment earnings are $400 or more for the year. This threshold is notably low; much lower than the income threshold for filing a tax return. You can owe self-employment tax even if your total income is below the filing threshold for income tax.
Self-employment income typically comes from:
Self-employment tax is 15.3% of 92.35% of your net self-employment earnings. The 92.35% factor approximates the employer-equivalent portion. Of the 15.3%, 12.4% goes to Social Security (on earnings up to the wage base of $168,600 in 2024) and 2.9% goes to Medicare (on all earnings with no cap). An additional 0.9% Medicare surtax applies to earnings above $200,000.
Yes, you can deduct the employer-equivalent half of your self-employment tax (7.65%) as an adjustment to income on Schedule 1 of Form 1040. This is an above-the-line deduction, meaning you get it whether you itemize or take the standard deduction. It reduces your adjusted gross income but does not reduce your self-employment tax itself.
Yes, if your net earnings from self-employment are $400 or more, you must file Schedule SE and pay self-employment tax. This applies to any side hustle income reported on Schedule C, including freelancing, gig work, selling goods online, or providing services. The $400 threshold is much lower than the income tax filing threshold, catching many people by surprise.
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IRS Schedule C: Reporting Self-Employment Profit and Loss
The complete guide to Schedule C for sole proprietors, freelancers, and gig workers covering business income, deductible expenses, home office deductions.
Notably, S corporation distributions and limited partner shares of partnership income are generally not subject to self-employment tax; a distinction that drives significant tax planning. This is one of the primary reasons business owners choose S corporation status: by paying themselves a "reasonable salary" (subject to employment taxes) and taking additional profits as distributions (not subject to SE tax), they can legally reduce their total tax burden.
Schedule SE is filed with Form 1040 by April 15. However, because self-employment tax is part of the pay-as-you-go system, most self-employed individuals must make quarterly estimated tax payments (using Form 1040-ES) that cover both income tax and self-employment tax.
Before calculating the 15.3% tax, you multiply your net self-employment earnings by 92.35% (0.9235). This reduction is designed to treat self-employed individuals comparably to employees, whose employer's share of FICA is not included in their taxable wages. If you earned $100,000 net on Schedule C, your SE tax base is $92,350.
The Social Security portion is 12.4% of net SE earnings up to the Social Security wage base: $168,600 for 2024. Once your combined wages (if any) and SE earnings exceed this cap, no additional Social Security tax is owed. The wage base is adjusted annually for inflation and has been rising steadily; it was $147,000 in 2022 and $160,200 in 2023.
If you also have W-2 wages, your wages are counted first against the wage base. If your employer paid you $150,000, only $18,600 of your self-employment income would be subject to the Social Security portion ($168,600 - $150,000).
The Medicare portion is 2.9% of all net SE earnings; there is no wage base cap for Medicare. Every dollar of self-employment income is subject to the 2.9% Medicare tax.
If your self-employment income (combined with wages, if any) exceeds $200,000 (single) or $250,000 (married filing jointly), you owe an additional 0.9% Medicare tax on the excess. This is an employee-only tax; there is no employer match; bringing the total Medicare rate to 3.8% on income above the threshold.
After calculating your self-employment tax on Schedule SE, you can deduct half of the SE tax as an above-the-line deduction on Schedule 1 of Form 1040 (Line 15). This deduction reduces your adjusted gross income (AGI) and thus your income tax, but it does not reduce the SE tax itself. The rationale: employers deduct their share of FICA as a business expense; self-employed individuals get the equivalent deduction on the "employer" half.
The combined effective tax rate for self-employed individuals can be eye-opening. Consider someone with $100,000 in net Schedule C income, single, no other income:
Add state income tax (averaging 5-10% in states that tax income) and the total marginal rate for a self-employed individual can easily exceed 40%. For high earners above the Additional Medicare Tax threshold, the combined rate is even higher.
This article is educational and does not constitute tax advice. Consult a qualified tax professional for guidance specific to your situation.