How Self-Employment Tax Works
When you work as a W-2 employee, your employer pays half of your Social Security and Medicare taxes (7.65%), and you pay the other half through paycheck withholding. As a self-employed individual, you are both the employer and the employee — so you pay the full 15.3%.
The self-employment tax is calculated on 92.35% of your net self-employment income (not 100%). This adjustment accounts for the fact that employers do not pay FICA on the employer's share. The 12.4% Social Security portion applies only up to the wage base limit of $176,100 for 2025. The 2.9% Medicare portion applies to all net self-employment income with no cap. An additional 0.9% Medicare surtax applies if your income exceeds $200,000 (single) or $250,000 (married filing jointly).
Self-Employment Tax Calculation Example
| Step | Amount |
|---|---|
| Net self-employment income | $80,000 |
| × 92.35% (taxable portion) | $73,880 |
| Social Security tax (12.4%) | $9,161 |
| Medicare tax (2.9%) | $2,143 |
| Total self-employment tax | $11,304 |
| Deductible half (above-the-line) | $5,652 |
The deductible half is critical — it reduces your adjusted gross income by $5,652, which in turn lowers your income tax. At the 22% bracket, this deduction saves an additional $1,243 in income tax.
Essential Deductions for Freelancers
Home Office Deduction. If you use a dedicated space in your home exclusively for business, you can deduct either actual expenses (proportional to the square footage) or use the simplified method ($5 per square foot, up to 300 sq ft = $1,500 max). The actual method often produces a larger deduction but requires detailed record-keeping of rent/mortgage, utilities, insurance, and maintenance.
Health Insurance Premiums. Self-employed individuals can deduct 100% of health insurance premiums for themselves, their spouse, and dependents. This is an above-the-line deduction, meaning it reduces AGI even if you take the standard deduction. For a family paying $12,000/year in premiums, this deduction saves $2,640-$4,440 in income tax depending on the bracket.
Retirement Contributions. Self-employed retirement accounts offer the largest potential deductions. A SEP-IRA allows contributions of up to 25% of net self-employment income (max $69,000). A Solo 401(k) allows employee contributions of $23,500 ($31,000 if 50+) plus employer contributions of 25% of net income. These contributions reduce both income tax and potentially affect self-employment tax calculations.
Qualified Business Income (QBI) Deduction. The QBI deduction allows self-employed individuals to deduct up to 20% of qualified business income. A freelancer with $100,000 in net business income could deduct $20,000, saving $4,400-$7,400 in income tax. Phase-outs apply for specified service trades or businesses (consulting, law, accounting, health, etc.) at income above $191,950 (single).
Vehicle Expenses. If you use your vehicle for business, you can deduct either actual expenses or use the standard mileage rate of 67 cents per mile for 2025. A freelancer driving 10,000 business miles would deduct $6,700.
New: Tip Income Deduction. Under the One Big Beautiful Bill Act, qualifying tip income up to $25,000 per year is deductible. This benefits self-employed individuals in service industries who receive tips, such as freelance personal trainers, independent hair stylists, and rideshare drivers who receive tips through apps.
Quarterly Estimated Tax Payments
Unlike W-2 employees who have taxes withheld from each paycheck, freelancers must make quarterly estimated tax payments to the IRS. Failure to make adequate payments results in an underpayment penalty.
| Quarter | Income Period | Payment Deadline |
|---|---|---|
| Q1 | January – March | April 15, 2025 |
| Q2 | April – May | June 16, 2025 |
| Q3 | June – August | September 15, 2025 |
| Q4 | September – December | January 15, 2026 |
A reliable rule of thumb is to set aside 25-30% of every payment you receive for taxes. This covers both income tax and self-employment tax for most freelancers in the 12-22% income tax brackets. If you earn higher income (24%+ bracket), set aside 35-40%. Open a separate savings account dedicated to tax payments to avoid spending money earmarked for the IRS.
Schedule C Deductions Checklist
- Office supplies — Paper, ink, pens, postage, etc.
- Software and subscriptions — Adobe, Slack, project management tools, domain hosting
- Equipment — Computer, monitor, keyboard, desk (Section 179 deduction for items over $2,500)
- Internet and phone — Business-use percentage of your monthly bills
- Professional development — Courses, conferences, certifications, books
- Professional services — Accountant fees, legal fees, tax preparation
- Marketing and advertising — Website costs, business cards, online ads
- Travel — Transportation, lodging, and 50% of meals for business travel
- Insurance — Professional liability, business insurance premiums
- Bank and payment processing fees — PayPal, Stripe, bank account fees
- Contract labor — Payments to subcontractors (file 1099s for payments over $600)
Frequently Asked Questions
Self-employment tax is 15.3% on 92.35% of your net self-employment income. This consists of 12.4% for Social Security (on income up to $176,100 for 2025) and 2.9% for Medicare (on all income). An additional 0.9% Medicare surtax applies to income above $200,000 for single filers. You can deduct half of the SE tax on your federal return.
The total self-employment tax rate is 15.3%, split between 12.4% for Social Security and 2.9% for Medicare. This is because self-employed individuals pay both the employee and employer portions of FICA taxes, whereas W-2 employees split the cost with their employer.
Yes. If your quarterly estimated tax payments and any withheld taxes exceed your total tax liability (income tax plus self-employment tax), you will receive a refund. Many freelancers who make conservative estimated payments receive refunds. However, unlike W-2 employees, freelancers must proactively make estimated payments to avoid underpayment penalties.
The four quarterly deadlines for 2025 are April 15, 2025 (Q1), June 16, 2025 (Q2), September 15, 2025 (Q3), and January 15, 2026 (Q4). You must pay at least 90% of your current year tax or 100% of your prior year tax (110% if AGI over $150,000) to avoid penalties.
Freelancers have access to many deductions including home office (simplified method: $5/sq ft up to 300 sq ft = $1,500 max), health insurance premiums (100% deductible), retirement contributions (SEP-IRA up to $69,000, Solo 401k up to $23,500 + employer match), business expenses (supplies, software, equipment), vehicle expenses (67 cents/mile for 2025), professional development and education, internet and phone (business percentage), and half of self-employment tax.
Under the One Big Beautiful Bill Act, qualifying tip income up to $25,000 per year can be deducted from federal income tax. This applies to self-employed individuals who receive tips in customary tipping occupations. The deduction phases out at $160,000 MAGI.
You pay self-employment tax on net self-employment earnings exceeding $400. Net earnings means your gross 1099 income minus business expenses. If your net self-employment income is $400 or less, you do not owe SE tax (though you may still owe income tax).
A SEP-IRA (Simplified Employee Pension) allows self-employed individuals to contribute up to 25% of net self-employment income, with a maximum of $69,000 for 2025. Contributions are tax-deductible, reducing both your income tax and potentially your self-employment tax base. A freelancer earning $100,000 who contributes $20,000 to a SEP-IRA reduces their taxable income by $20,000, saving $4,400-$7,400 in income tax depending on their bracket.
Freelancers report self-employment income on Schedule C (Profit or Loss from Business), which is filed with Form 1040. Self-employment tax is calculated on Schedule SE. You deduct half of SE tax on Schedule 1. Throughout the year, you should make quarterly estimated payments using Form 1040-ES. Many freelancers also benefit from the Qualified Business Income (QBI) deduction, which allows a 20% deduction on qualified business income.
The QBI deduction allows qualifying self-employed individuals to deduct up to 20% of their qualified business income. For a freelancer with $80,000 in net business income, this could mean a $16,000 deduction — saving $3,520 to $5,920 in income tax depending on the bracket. Income limits and phase-outs apply for certain service businesses above $191,950 (single) or $383,900 (married filing jointly).