Do Small Business Owners Pay Into Social Security?

Yes. Small business owners do pay into Social Security, and they pay both sides of the bill. Through the self-employment tax, an owner covers the full 15.3% that a traditional employee splits with an employer, applied to net business earnings of $400 or more per year.¹

What the 15.3% Actually Covers

The Self-Employment Contributions Act, at 26 U.S.C. § 1401, sets the combined rate at 15.3%: 12.4% goes to Social Security (formally, Old-Age, Survivors, and Disability Insurance) and 2.9% goes to Medicare (Hospital Insurance).¹ A W-2 employee pays half of that and the employer pays the other half. When you own the business, you are both parties, so you pay the full amount yourself.

The tax code takes some of the sting out. Under 26 U.S.C. § 164(f), you can deduct the employer-equivalent half of your self-employment tax when calculating adjusted gross income.² The deduction lowers your income tax. It does not lower the self-employment tax itself.

Which Earnings Get Taxed

Self-employment tax only starts once your net business profit reaches $400 for the year. Below that, you owe nothing for Social Security or Medicare on those earnings.³

Above that floor, the 15.3% rate does not apply to your entire net profit. You first multiply net profit by 92.35%, which mirrors the tax treatment employees receive.⁴ So if your Schedule C shows $100,000 in net profit, the taxable base is $92,350, and the self-employment tax on that base is roughly $14,130.

The 2026 Wage Base and Extra Medicare Tax

The 12.4% Social Security portion only applies to earnings up to an annual cap. For 2026, that cap is $184,500.⁵ Anything above that is exempt from the Social Security piece. The 2.9% Medicare portion has no ceiling and applies to every dollar of net earnings.

The cap moves each year with national wage growth. It was $176,100 in 2025 and $168,600 in 2024.⁶

Higher earners also owe an extra 0.9% Additional Medicare Tax under 26 U.S.C. § 1401(b)(2) once net self-employment income crosses a filing-status threshold:¹

Single or head of household: $200,000
Married filing jointly: $250,000
Married filing separately: $125,000

These thresholds are fixed and do not adjust for inflation.⁷ A single filer with $250,000 in net self-employment income pays the standard 2.9% on the full amount plus an additional 0.9% on the $50,000 above $200,000, adding $450 to the Medicare bill.

How Your Business Structure Changes the Math

The legal form of your business determines which earnings are exposed to self-employment tax.

Sole Proprietors and Single-Member LLCs

The IRS treats these two forms the same. Every dollar of net profit flows onto your personal return and is subject to self-employment tax. Profit is reported on Schedule C, then the tax is calculated on Schedule SE.

Partnerships

A general partner owes self-employment tax on the full distributive share of partnership income, whether or not the partner actively worked in the business that year. Limited partners are largely shielded: 26 U.S.C. § 1402(a)(13) excludes a limited partner’s distributive share from self-employment income. Guaranteed payments for services a limited partner actually performs stay taxable.³

S-Corporations

An S-corp owner who works in the business must draw a reasonable salary reported on a W-2, with standard payroll taxes withheld through the corporate payroll system. Profits taken as shareholder distributions on top of that salary are generally not subject to Social Security or Medicare tax.⁸

The IRS watches for owners who set an artificially low salary and pull the rest as distributions. When evaluating whether compensation is reasonable, the agency looks at the owner’s training and experience, time devoted to the business, what comparable businesses pay for similar services, and the company’s dividend history.⁸ If they get it wrong, distributions can be reclassified as wages, with back taxes and penalties attached.

When You Also Have a W-2 Job

If you hold a regular job and run a business on the side, the $184,500 Social Security wage base applies to your combined earnings from both. Your employer withholds Social Security tax from your paycheck first. On your return, you only owe the 12.4% Social Security portion on the gap between your W-2 wages and the cap.⁵

If your W-2 wages alone already meet or exceed $184,500, you owe no Social Security tax on your self-employment income. The 2.9% Medicare tax still applies to all of your net self-employment earnings, and the 0.9% Additional Medicare Tax applies once your combined earnings cross the filing-status threshold.⁴

What You Get Back: Credits and Future Benefits

Paying self-employment tax buys you into the same benefit system employees are in. In 2026, you earn one Social Security credit for every $1,890 in net self-employment earnings, up to four credits per year.⁹ That means $7,560 in net earnings maxes out your credits for the year. You need 40 credits, roughly 10 years of work, to qualify for retirement benefits.¹⁰

Your retirement benefit is based on your highest 35 years of indexed earnings. Social Security calculates an Average Indexed Monthly Earnings figure by taking those 35 years, adjusting earlier ones for wage inflation, and averaging. If you have fewer than 35 years on the record, zeros fill the gaps and pull the average down.¹¹ For a business owner, that means low-profit years and years you don’t pay in directly reduce the monthly check later.

Forms and Quarterly Payments

Three forms attach to your Form 1040:¹²

Schedule C reports gross income and deductible expenses to arrive at net profit.
Schedule SE takes that net profit, applies the 92.35% adjustment and the wage base cap, and calculates the self-employment tax.
Schedule 1 is where you claim the deduction for the employer-equivalent half.

Partnership income flows through Schedule K-1 rather than Schedule C, but Schedule SE still runs the calculation the same way. S-corp owners drawing a W-2 salary handle that portion through corporate payroll, not Schedule SE.

Because no one withholds tax from your business income, you pay throughout the year using Form 1040-ES. For the 2026 tax year, the quarterly due dates are April 15, 2026; June 15, 2026; September 15, 2026; and January 15, 2027.¹³ You can skip the January payment if you file your full 2026 return and pay any balance by February 1, 2027. Payments go through the Electronic Federal Tax Payment System, a debit or credit card processor, or a check mailed with the paper voucher.¹⁴

Who Does Not Pay In

Almost every business owner owes self-employment tax. A narrow exemption exists for members of certain recognized religious groups whose community has provided for its dependent members continuously since December 31, 1950, and is conscientiously opposed to Social Security and Medicare benefits. Approval, requested on IRS Form 4029, stops the tax but permanently waives all rights to Social Security retirement, disability, and Medicare benefits. Separately, a foreign national working in the U.S. under a totalization agreement may have self-employment income taxed only under the home country’s system.¹

1
Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax
2
Office of the Law Revision Counsel. 26 USC 164 – Taxes
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Office of the Law Revision Counsel. 26 USC 1402 – Definitions
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Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
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Social Security Administration. Social Security Tax Limits on Your Earnings
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Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet
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Internal Revenue Service. Questions and Answers for the Additional Medicare Tax
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Internal Revenue Service. S Corporation Compensation and Medical Insurance Issues
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Social Security Administration. Quarter of Coverage
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Social Security Administration. How You Earn Credits
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Social Security Administration. Social Security Benefit Amounts
12
Internal Revenue Service. About Schedule SE (Form 1040), Self-Employment Tax
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Internal Revenue Service. 2026 Form 1040-ES Estimated Tax for Individuals
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Internal Revenue Service. Estimated Taxes