Is Self-Employment Tax on Gross or Net Income?

Everyone · Explainer · Updated October 1, 2026 · LearnLife Editorial

What Is Self-Employment Tax in Plain Words?

Self-employment tax is a tax paid by people who work for themselves, like freelancers, independent contractors, or small business owners, to fund Social Security and Medicare. Normally, when you work for an employer, they split this tax with you, withholding half from your paycheck and paying the other half. If you’re self-employed, you pay both parts yourself through the self-employment tax. This tax is separate from your regular income tax but is calculated based on your earnings from your business or freelance work. Paying self-employment tax ensures you qualify for Social Security benefits and Medicare coverage in the future. Because you cover both the employer and employee portions, the rate is higher than what employees usually pay.

Is Self-Employment Tax Calculated on Gross or Net Income?

Self-employment tax is calculated on your net income, not your gross income. Gross income is the total money you earn from your business before subtracting any expenses. Net income is what’s left after you deduct your ordinary and necessary business expenses, such as supplies, rent, utilities, and mileage related to work. The IRS requires that you first figure your net profit or loss using Schedule C (or Schedule F for farming). Then, to calculate the self-employment tax, you multiply your net income by 92.35% (this adjustment accounts for the fact that you can deduct the "employer" portion of the tax). After that, you apply the self-employment tax rate, which is about 15.3%, to this adjusted net earnings figure. This process ensures the tax is based on your actual earnings, not on total sales or gross receipts.

How Does Self-Employment Tax Work? A Detailed Example

Suppose you run a freelance photography business. In one year, you receive $50,000 in payments from clients (your gross income). To do your work, you spent $15,000 on camera equipment, travel, advertising, and software (your business expenses). Your net income is $35,000 ($50,000 - $15,000). The IRS says you only pay self-employment tax on 92.35% of that $35,000, which equals $32,322.50. The self-employment tax rate is approximately 15.3%, including 12.4% for Social Security and 2.9% for Medicare. Multiplying $32,322.50 by 15.3% gives you about $4,943 in self-employment tax for that year. This example illustrates why you don’t pay self-employment tax on your full gross income but on your net earnings after expenses.

Why Does It Matter Whether Self-Employment Tax Is on Gross or Net Income?

Knowing that self-employment tax is on net income helps you plan your finances and taxes accurately. If you mistakenly calculate self-employment tax on your gross income, you could overestimate your tax liability and set aside too much money, which could strain your cash flow. On the flip side, not deducting legitimate expenses means paying more tax than you owe. Tracking your expenses carefully and understanding what’s deductible can lower your net income, reducing your self-employment tax bill. This knowledge also helps you decide if it’s worth investing in business expenses that can save you money on taxes. For example, buying a new computer for work might reduce your tax bill more than the cost itself. Accurate calculations also help when making quarterly estimated tax payments, so you avoid penalties for underpayment or large unexpected tax bills.

What Expenses Can You Deduct to Lower Your Net Income?

You can deduct many ordinary and necessary expenses related to your business to arrive at your net income. Examples include:

• Office supplies like paper, printer ink, or pens
• Business phone and internet costs (the portion used for work)
• Mileage or actual car expenses when traveling for business purposes
• Rent for a dedicated home office space (if you qualify)
• Equipment and software needed to run your business
• Advertising and marketing expenses
• Fees paid to contractors or subcontractors
• Business insurance premiums
• Utilities and repairs directly related to your workspace

It’s essential to keep detailed records and receipts for these expenses. The IRS requires that deductions be supported by evidence in case of an audit. When calculating your net income on Schedule C, you subtract these expenses from your gross receipts to determine your profit or loss. Only then do you calculate the self-employment tax on the adjusted amount.

How Do You Report and Pay Self-Employment Tax?

To report self-employment tax, you use IRS Schedule SE (Self-Employment Tax) along with Schedule C (Profit or Loss from Business) and your Form 1040 tax return. Schedule C calculates your net business income by subtracting expenses from your gross income. Schedule SE takes that net income, applies the 92.35% adjustment, and computes your self-employment tax based on the current rates. If you expect to owe $1,000 or more in taxes for the year, the IRS requires you to pay estimated taxes quarterly. Estimated payments help you avoid penalties for underpaying your taxes throughout the year. You can make these payments online or by mail using IRS Form 1040-ES. It’s important to keep track of deadlines for these payments: usually April, June, September, and January for the following year.

What Are Common Confusions Related to Self-Employment Tax?

Many people mix up self-employment tax with regular income tax. Self-employment tax funds Social Security and Medicare, while income tax goes to federal and possibly state governments to fund various programs. You pay both taxes on your net income, but they are reported and calculated differently. Another confusion involves the difference between gross and net income: gross is total income before expenses, while net is after expenses. Some also confuse self-employment tax with payroll taxes withheld from employees’ paychecks. Self-employed individuals pay both the employer and employee portions themselves. Additionally, some believe they can avoid self-employment tax by simply paying themselves a salary from their business, but unless you have a formal business structure like an S corporation, all net earnings are subject to self-employment tax.

What Should You Do Next If You Are Self-Employed?

If you’re self-employed, follow these steps to manage your self-employment tax effectively:

1. Track All Income and Expenses: Keep detailed records of every payment received and every business-related expense. Use accounting software or spreadsheets.
2. Understand Deductible Expenses: Learn which expenses are deductible. This lowers your taxable income and self-employment tax.
3. Calculate Net Income With Schedule C: When filing, use Schedule C to calculate your net business income.
4. Use Schedule SE to Calculate Self-Employment Tax: Apply the 92.35% adjustment and calculate your tax liability accurately.
5. Make Quarterly Estimated Tax Payments: If you expect to owe $1,000 or more, send payments to the IRS four times a year.
6. Keep Up to Date With IRS Rules: Tax laws and rates can change, so check IRS.gov annually or consult a tax professional.
7. Consider Professional Help: If your taxes are complicated, working with an accountant or tax advisor can save you money and stress.

By following these steps, you can avoid surprises and make sure you pay only what you owe.

How Can You Stay Informed About Changing Tax Rules?

Tax rates and thresholds for self-employment tax can change yearly. The IRS updates the maximum amount of income subject to Social Security tax and other limits, so knowing the current figures is important. Visit IRS.gov or subscribe to IRS newsletters to get updates. The IRS also provides detailed instructions for Schedule C and Schedule SE each year. If you want more personalized help, tax professionals or tax software programs update automatically to reflect current tax laws. Staying informed prevents mistakes and potential penalties.

Frequently asked questions

Can I deduct half of my self-employment tax on my income tax return?

Yes. When filing your income tax return, you can deduct half of the self-employment tax you paid. This deduction lowers your taxable income but does not affect your net earnings for calculating self-employment tax.

What if my self-employment income is very low? Do I still pay self-employment tax?

If your net earnings from self-employment are below the IRS threshold (generally $400), you usually don’t owe self-employment tax. However, you still need to file a tax return if your income reaches the minimum filing requirement.

How can I estimate my quarterly self-employment tax payments?

Use IRS Form 1040-ES to estimate your income and self-employment tax for the year, then divide that amount into four payments due in April, June, September, and January. Keep good records and adjust payments if your income changes.

What happens if I don’t pay self-employment tax on time?

The IRS may charge penalties and interest on late payments, and could take collection actions like withholding refunds or garnishing wages. It’s important to pay on time or contact the IRS if you can’t pay to arrange a payment plan.

Is self-employment tax the same in every state?

Self-employment tax is a federal tax and applies uniformly across the U.S. However, some states also have their own taxes on self-employment income, so check your state’s tax agency for specific rules.

How is self-employment tax different from income tax?

Self-employment tax funds Social Security and Medicare and is calculated only on self-employed earnings. Income tax is based on your total taxable income and funds federal and state governments. Both taxes apply to your net income from self-employment but are reported separately.