Self-Employment Tax Guide
A practical reference for freelancers, independent contractors, and small business owners.
Self-Employment Tax Guide
A practical reference for freelancers, independent contractors, and small business owners navigating SE tax obligations.
What Is Self-Employment Tax?
Self-employment (SE) tax is the combined Social Security and Medicare tax that applies to individuals who work for themselves. Employees pay these taxes through payroll withholding — but self-employed individuals must cover both the employer and employee portions themselves.
SE tax is calculated on net earnings from self-employment, not gross income.
- Single / MFS / Head of Household: Net earnings over $200,000
- Married Filing Jointly (MFJ): Net earnings over $250,000
- Married Filing Separately (MFS): Net earnings over $125,000
This 0.9% surtax applies to the combined total of wages, self-employment income, and RRTA compensation above the threshold.
The 12.4% Social Security portion applies only up to $176,100 of net SE income for 2025. Earnings above this amount are subject only to the 2.9% Medicare tax (plus the 0.9% surtax if applicable). This wage base is adjusted annually by the SSA.
Who Must Pay Self-Employment Tax?
You are required to pay SE tax if any of the following applies:
- Net earnings from self-employment are $400 or more in a tax year
- You receive Form 1099-NEC income as an independent contractor
- You receive Form 1099-K income from payment platforms (Venmo, PayPal, Etsy, etc.) for services rendered
- You operate a sole proprietorship(Schedule C)
- You are a single-member LLC taxed as a disregarded entity
- You are a partner receiving guaranteed payments or a distributive share of SE income
Payment platforms are required to issue Form 1099-K when reportable transactions exceed IRS thresholds. Even if you do not receive a 1099-K, you are still required to report all self-employment income.
How Self-Employment Tax Is Calculated
Required Forms
Reports profit or loss from a sole proprietorship or single-member LLC. Lists business income and deductible expenses.
Calculates the SE tax owed based on net earnings from Schedule C or partnership income.
Individual income tax return. SE tax from Schedule SE flows here, along with the 50% SE deduction.
Used to calculate the Qualified Business Income (QBI) deduction, if eligible. Use 8995-A for specified service trades or higher-income filers.
Estimated Tax Payments
Because no taxes are withheld from self-employment income, most self-employed individuals are required to make quarterly estimated tax payments covering both income tax and SE tax.
Deductible Business Expenses
Common deductions that reduce your net earnings — and therefore your SE tax base:
- Home office expenses (Form 8829)
- Business mileage or vehicle expenses
- Supplies and equipment
- Software subscriptions
- Phone and internet (business portion)
- Professional fees (legal, accounting)
- Advertising and marketing
- Business insurance
- Continuing education
- Self-employed health insurance premiums
- Retirement contributions (SEP-IRA, Solo 401(k))
- Half of SE tax paid (above-the-line)
Self-employed individuals may deduct 100% of health, dental, and qualified long-term care insurance premiums paid for themselves, their spouse, and dependents as an above-the-line deduction. This deduction is not available for any month you were eligible to participate in an employer-subsidized plan.
Accurate recordkeeping — receipts, mileage logs, bank statements — is essential for substantiating deductions in the event of an IRS inquiry.
Qualified Business Income (QBI) Deduction
Eligible self-employed individuals may deduct up to 20% of qualified business income from taxable income under IRC §199A. This deduction reduces income tax — it does not reduce SE tax.
- Type of business: Specified Service Trades or Businesses (SSTBs) — such as law, health, consulting, and financial services — face income-based phase-outs
- Taxable income: Phase-outs begin at $197,300 (Single) / $394,600 (MFJ) for 2025
- W-2 wages and qualified property: May limit the deduction for higher-income filers
Use Form 8995 (simplified) or Form 8995-A (complex situations) to calculate. Consult a CPA if your income approaches the phase-out thresholds.
LLC & S Corporation Strategies
Sole proprietors and single-member LLCs pay SE tax on all net earnings. Electing S corporation status may reduce SE tax by splitting income into two components:
The IRS requires S corp owner-employees to receive a salary that is reasonable for the services provided. This salary is subject to FICA (Social Security and Medicare) taxes.
Remaining profits distributed to shareholders are not subject to FICA taxes, potentially reducing overall tax burden.
An S corp election is generally worth considering when net self-employment profit exceeds approximately $40,000–$50,000 per year. Below this level, the cost of payroll setup, quarterly filings, and additional compliance (Form 1120-S, state filings) typically outweighs the SE tax savings. This threshold varies by state and individual circumstances — consult a CPA before electing.
- Payroll must be established and run through each pay period
- Reasonable compensation must be documented and defensible
- Additional compliance: Form 1120-S, state filings, quarterly payroll returns
- Salary set unreasonably low is a known IRS audit trigger
Recordkeeping Requirements
Good recordkeeping reduces audit risk, ensures accurate deductions, and supports compliance. Retain documentation for a minimum of 3 years from the filing date (longer in cases of substantial underreporting).
- Income records: 1099-NEC, 1099-K, invoices, bank deposit records
- Expense records: Receipts, credit card statements, mileage logs
- Asset purchases: Invoices and purchase records for depreciation
- Home office: Square footage calculations, utility bills
- Estimated tax payments: Confirmation numbers, bank records
- Health insurance premiums: Premium statements, enrollment records
Summary Checklist
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