Last reviewed: June 2026 This article is for general educational purposes only and is not tax, legal, or accounting advice. Rules can change, and your filing obligations depend on your facts. Consider working with a CPA, EA, or attorney before making tax elections or filing decisions.

Self-employment tax often surprises new business owners because it is not the same thing as income tax. A W-2 employee sees Social Security and Medicare withholding on a paycheck. A self-employed person often has no paycheck withholding, so the tax shows up later through Schedule SE, estimated tax payments, or the final Form 1040 balance.

For LLC owners, the important point is simple: forming an LLC does not automatically remove self-employment tax. A single-member LLC is usually taxed like a sole proprietorship by default, and a multi-member LLC is usually taxed like a partnership by default. An S-Corp election can change how the tax works, but it also adds payroll and compliance rules.

Need the fast version?

Most LLC owners should understand three things first: self-employment tax is separate from income tax, it is generally based on net profit rather than gross revenue, and the 15.3% rate is made up of Social Security and Medicare taxes.

Quick Answer: How Does Self-Employment Tax Work?

Self-employment tax is the Social Security and Medicare tax paid by people who work for themselves. The standard rate is 15.3%. That rate is made up of 12.4% for Social Security and 2.9% for Medicare.

You usually calculate the tax on Schedule SE and attach it to Form 1040. Sole proprietors and single-member LLC owners often calculate business profit first on Schedule C. That net profit is then used to calculate self-employment tax.

Question Short answer
What is the self-employment tax rate? 15.3% before Additional Medicare Tax.
What does it cover? Social Security and Medicare taxes.
Is it separate from income tax? Yes. It is added on top of regular income tax.
Is it based on gross revenue? No. It is generally based on net earnings after business expenses.
What form calculates it? Schedule SE, attached to Form 1040 or Form 1040-SR.
Does an LLC avoid it? No. Default LLC taxation often still creates self-employment tax.

Self-Employment Tax Rate in 2026

The self-employment tax rate is 15.3%. The rate is not one single tax. It combines the Social Security tax and the Medicare tax that employees and employers normally split.

Tax part Rate 2026 limit What to know
Social Security 12.4% $184,500 wage base for 2026 This is the combined employer and employee share for self-employed taxpayers.
Medicare 2.9% No wage base limit Applies to self-employment earnings even after the Social Security limit is reached.
Additional Medicare Tax 0.9% Applies above filing-status thresholds Common thresholds are $200,000 for single filers and $250,000 for married filing jointly.

For 2026, the Social Security wage base is $184,500. The Social Security part of self-employment tax applies up to that annual limit. The Medicare part does not stop at the wage base.

Do not confuse tax rate with total tax bill

A 15.3% self-employment tax rate does not mean your full tax rate is 15.3%. You may still owe federal income tax, state income tax, local tax, and possibly Additional Medicare Tax depending on income and filing status.

Who Pays Self-Employment Tax?

Self-employment tax generally applies when you have net earnings from self-employment. The IRS commonly applies this to sole proprietors, independent contractors, freelancers, gig workers, and many LLC owners whose businesses are taxed under default rules.

Business situation SE tax? Why
Single-member LLC Yes Usually taxed like a sole proprietor by default, so net business profit is generally subject to self-employment tax.
Sole proprietor Yes Business profit is normally reported on Schedule C and self-employment tax is calculated on Schedule SE.
1099 contractor Yes A 1099 usually means no employer withheld Social Security and Medicare tax for that income.
Multi-member LLC active member Often Active members may owe self-employment tax on their share of trade or business income, depending on the facts.
LLC taxed as an S-Corp Different rules Owner-employees use payroll for reasonable salary; distributions are generally treated differently from Schedule C self-employment earnings.

The IRS generally requires self-employment tax and Schedule SE when net earnings from self-employment are $400 or more. That threshold is low, so even a small profitable side business can create a filing issue.

How Self-Employment Tax Is Calculated

A rough self-employment tax calculator starts with net business profit, not gross revenue. For many sole proprietors and single-member LLCs, that means you first subtract ordinary and necessary business expenses on Schedule C. Learn more about how disregarded entity taxes work in our Single-Member LLC Taxes guide.

After net profit is calculated, Schedule SE applies the self-employment tax formula. A simplified estimate is: 

Net business profit × 92.35% × 15.3% = estimated self-employment tax

The 92.35% step reflects the employer-equivalent adjustment built into the self-employment tax calculation. It is one reason a quick mental calculation using 15.3% of total profit will usually be slightly high.

Use this as an estimate, not a filed return

Schedule SE can involve details not shown in a basic calculator example, especially if you also have W-2 wages, church employee income, farm income, partnership income, or Additional Medicare Tax. Use the actual IRS form, tax software, or a tax professional for filing.

Self-Employment Tax Calculator Example

Here is a simple example for a single-member LLC owner with $120,000 in client revenue and $20,000 in deductible business expenses.

Step Amount Explanation
Gross business income $120,000 Total client payments before expenses.
Business expenses -$20,000 Software, equipment, supplies, contractor costs, or other deductible business costs.
Net profit $100,000 The amount that usually flows from Schedule C into the self-employment tax calculation.
Net earnings for SE tax estimate $92,350 A simplified estimate using 92.35% of net profit.
Estimated self-employment tax $14,130 15.3% of $92,350, before regular federal or state income tax.

In this example, the estimated self-employment tax is about $14,130. That is before regular federal income tax and before any state income tax. This is why a self-employed person can feel as if the tax bill is much higher than it was as a W-2 employee.

Calculate Your Own SE Tax Instantly

You don't have to calculate these figures manually. Use our interactive Self-Employment Tax Calculator to compute your Social Security, Medicare, and Additional Medicare taxes, including W-2 salary offsets.

The 2026 Social Security Wage Base Limit

The 12.4% Social Security part of self-employment tax does not apply to unlimited earnings. For 2026, the Social Security contribution and benefit base is $184,500. Once combined wages and self-employment earnings reach that limit, the Social Security portion stops applying for the year.

Medicare is different. The 2.9% Medicare part of self-employment tax does not have a wage base cap. High earners may also owe Additional Medicare Tax on income above the applicable filing-status threshold.

W-2 income can affect the calculation

If you have both W-2 wages and self-employment income, the Social Security wage base is shared across both. High W-2 wages can reduce or remove the Social Security part of self-employment tax on your business profit, but Medicare tax can still apply.

Additional Medicare Tax for High Earners

Additional Medicare Tax is a separate 0.9% tax that can apply when wages, compensation, and self-employment income exceed the threshold for your filing status.

Filing status Threshold
Single $200,000
Head of household $200,000
Married filing jointly $250,000
Married filing separately $125,000
Qualifying surviving spouse $200,000

The Additional Medicare Tax is one reason high-income self-employed taxpayers should not rely on a simple 15.3% estimate. The standard Medicare portion is 2.9%, but the additional 0.9% can apply above the threshold.

Self-Employment Tax vs Income Tax

Self-employment tax and income tax are not the same. Self-employment tax funds Social Security and Medicare. Income tax is based on taxable income after deductions, filing status, credits, and tax brackets.

Tax What it funds or measures Why owners confuse it
Self-employment tax Social Security and Medicare. It is calculated on business earnings and paid with the individual return.
Federal income tax Regular income tax under federal brackets. It is also paid through Form 1040, so both taxes can appear in the same final balance.
State income tax State-level income tax, where applicable. State rules vary and may not mirror federal self-employment calculations.

This is why “how much tax will I pay as self-employed?” is not answered by one percentage. The total depends on self-employment tax, income tax, state tax, deductions, credits, retirement contributions, health insurance deductions, and estimated payments already made.

How to Pay Self-Employment Tax

Most self-employed people pay this tax through quarterly estimated tax payments. Estimated payments can cover both regular income tax and self-employment tax. The IRS estimated tax system is designed for people who do not have enough tax withheld from wages.

  1. Track revenue and expenses. Keep your books current so you know your real profit, not just your bank balance.
  2. Estimate business profit. Start with net profit after deductible business expenses.
  3. Estimate self-employment tax. Use Schedule SE, tax software, or a self-employment tax calculator.
  4. Add expected income tax. Self-employment tax is only one part of the payment.
  5. Pay quarterly when required. Many taxpayers use Form 1040-ES, IRS Direct Pay, EFTPS, or tax software.
Quarterly payments are not optional planning

If you wait until tax filing season, you may still be able to pay the balance, but you could also create a cash-flow problem or an underpayment penalty. Build the tax into your pricing and savings plan.

How to Reduce Self-Employment Tax Legally

The cleanest ways to reduce self-employment tax usually involve either reducing net business profit through legitimate deductions or changing the tax structure when the business is profitable enough to justify it.

  • Track all legitimate business expenses. Expenses can reduce net profit, which may reduce both income tax and self-employment tax.
  • Separate business and personal finances. Clean records make it easier to claim valid deductions and avoid missed expenses.
  • Review retirement and health insurance deductions. These can affect income tax planning, though not every deduction reduces self-employment tax in the same way.
  • Consider an S-Corp election at the right profit level. This can reduce self-employment tax for some LLC owners, but it creates payroll and filing duties.

Be careful with advice framed as “avoid self-employment tax.” The goal is not to hide income or invent deductions. The goal is to use the tax classification and deduction rules correctly.

How an S-Corp Can Reduce Self-Employment Tax

An LLC taxed as an S-Corp can change how owner income is treated. Instead of all business profit flowing through as self-employment earnings, an owner who works in the business generally receives a reasonable salary through payroll. Remaining profit may be distributed as owner distributions.

The potential savings come from the difference between salary and distributions. Salary is subject to payroll taxes. Distributions are generally not subject to self-employment tax in the same way. That does not make the distributions tax-free; they may still be subject to income tax.

Example Default LLC taxation LLC taxed as S-Corp
Business profit before owner pay $100,000 $100,000
Owner salary Not required under default Schedule C taxation $60,000 reasonable salary example
Amount exposed to payroll/SE-style tax Most net earnings may be subject to SE tax Salary is subject to payroll taxes
Potential distribution Not the same structure Remaining profit may be distributed to owner
S-Corp savings are not automatic

An S-Corp can add payroll software, bookkeeping, Form 1120-S filing, state payroll accounts, unemployment filings, and reasonable salary documentation. At lower profit levels, those costs may erase the tax savings.

For a deeper comparison, read our LLC vs S-Corp guide or use the S-Corp tax savings calculator .

Common Self-Employment Tax Mistakes

Most self-employment tax problems are not caused by complicated tax strategies. They are caused by misunderstanding the basics: what income is subject to the tax, how it is paid, and how much to set aside.

Mistake Why it matters
Saving only for income tax Self-employment tax is separate. A profitable Schedule C business can owe both income tax and SE tax.
Using gross revenue instead of profit Self-employment tax is generally based on net earnings after business expenses, not total deposits.
Ignoring quarterly payments Waiting until April can create a large balance and possible underpayment penalties.
Assuming an LLC removes SE tax An LLC is a legal structure. Default LLC taxation often still creates self-employment tax.
Electing S-Corp status too early Payroll, bookkeeping, and tax filing costs can erase savings when profit is still low.

Self-employment tax connects directly to estimated payments, LLC tax classification, S-Corp elections, payroll, and business deductions. These guides are the natural next step:

This article is general information only. Self-employment tax can become more complicated when you have W-2 wages, partnership income, multiple businesses, clergy income, farm income, high earnings, state tax issues, or an S-Corp election. Use a qualified tax professional when the filing position is unclear.