Self-Employment Tax: Rate, Calculation & Strategies to Reduce It
How Self-Employment Tax Works
When you work as an employee, your employer pays half of FICA taxes (7.65%) and withholds the other half from your paycheck. As a self-employed person, you’re both the employer and employee — so you pay the full 15.3%. This applies whether you freelance, run a sole proprietorship, or have partnership income.
Self-Employment Tax Rates (2024)
| Component | Rate | Income Cap |
|---|---|---|
| Social Security (OASDI) | 12.4% | $168,600 (2024 wage base) |
| Medicare (HI) | 2.9% | No cap — applies to all earnings |
| Additional Medicare | 0.9% | Earnings above $200,000 (single) / $250,000 (MFJ) |
| Total | 15.3% (up to 16.2% for high earners) | — |
How to Calculate Self-Employment Tax
The 92.35% factor (100% minus half of 15.3%) adjusts your earnings to account for the employer-equivalent portion — mimicking how W-2 employees don’t pay FICA on their employer’s share. On $100,000 of net self-employment income, the calculation is: $100,000 × 0.9235 × 0.153 = $14,130.
Step-by-Step Calculation
| Step | Action | Amount |
|---|---|---|
| 1 | Calculate net self-employment income (Schedule C revenue minus expenses) | $100,000 |
| 2 | Multiply by 92.35% | $92,350 |
| 3 | Apply 15.3% SE tax rate | $14,130 |
| 4 | Deduct employer-equivalent portion (50%) from income tax | −$7,065 deduction |
Key Deductions That Reduce SE Tax
Self-employment tax is calculated on net earnings — so every legitimate business deduction on Schedule C reduces both your income tax and your SE tax base:
- Home office deduction: Proportional share of rent/mortgage, utilities, and insurance
- Business equipment: Computers, software, and tools (Section 179 or depreciation)
- Health insurance premiums: 100% deductible for self-employed (reduces income tax, not SE tax directly)
- Retirement contributions: Solo 401(k) or SEP IRA contributions reduce income tax
- Vehicle expenses: Business use of your car (standard mileage or actual expenses)
- Professional services: Accounting, legal fees, and business insurance
S-Corp Election: The Biggest SE Tax Reduction Strategy
Once net self-employment income exceeds roughly $50,000–$60,000, electing S-Corp status can significantly reduce SE tax. As an S-Corp, you pay yourself a “reasonable salary” (subject to FICA) and take remaining profits as distributions (not subject to SE tax).
| Scenario ($150K net income) | Sole Proprietor | S-Corp (w/ $80K salary) |
|---|---|---|
| SE/FICA tax base | $150,000 | $80,000 (salary only) |
| SE/FICA tax | ~$21,194 | ~$12,240 |
| Tax savings | — | ~$8,954/year |
Quarterly Estimated Payments
Self-employment tax isn’t withheld from your income, so you must make estimated quarterly payments to cover both income tax and SE tax. Missing payments triggers underpayment penalties. Most self-employed individuals use the prior-year safe harbor method to calculate quarterly amounts.
Key Takeaways
- Self-employment tax is 15.3% (12.4% Social Security + 2.9% Medicare) on net earnings up to $168,600
- You can deduct the employer-equivalent half (7.65%) from your income tax
- Every Schedule C business deduction reduces your SE tax base
- S-Corp election can save $5,000–$15,000+ annually in SE tax for profitable businesses
- Make quarterly estimated payments to avoid underpayment penalties
Frequently Asked Questions
Who has to pay self-employment tax?
Anyone with $400 or more in net self-employment income must pay SE tax. This includes freelancers, independent contractors, sole proprietors, and general partners. It doesn’t apply to S-Corp shareholders (on distributions) or limited partners (on partnership income).
Is self-employment tax in addition to income tax?
Yes. Self-employment tax is separate from and in addition to federal income tax. On $100,000 of net SE income, you’d owe approximately $14,130 in SE tax plus your regular income tax based on your tax bracket. The combined rate can exceed 40% for high earners.
Does self-employment tax apply to rental income?
Generally no. Rental income is passive income and not subject to SE tax. However, if you’re a real estate professional who materially participates, or if you provide substantial services to tenants (like a hotel), the income may be subject to SE tax.
When does the S-Corp election make sense?
The general rule of thumb is when net self-employment income consistently exceeds $50,000–$60,000. Below that level, the additional costs of S-Corp compliance (payroll processing, tax returns, state fees) may outweigh the SE tax savings. A tax professional can run the exact numbers for your situation.
Does self-employment tax count toward Social Security benefits?
Yes. SE tax payments are credited to your Social Security record, which determines your future benefit amount. Your net SE earnings are included in the 35 highest-earning years used to calculate your Social Security benefit.