Self-Employment Tax Calculator

What Is Self-Employment Tax?

Self-employment tax is the Social Security and Medicare tax that self-employed individuals pay on their net earnings. When you work as a W-2 employee, these taxes (known as FICA) are split between you and your employer — each side pays 7.65%. As a self-employed person (freelancer, independent contractor, sole proprietor, or gig worker), you are both the employee and employer, so you pay the full 15.3%.

Self-employment tax is separate from income tax. Even if your income is low enough that you owe no income tax, you may still owe self-employment tax if your net SE earnings exceed $400.

How Self-Employment Tax Is Calculated

The IRS uses a specific formula to calculate your SE tax. Here is the step-by-step process:

1. Calculate net self-employment earnings: Gross income minus deductible business expenses (reported on Schedule C).
2. Apply the 92.35% factor: Multiply net earnings by 0.9235 to get your SE tax base. This adjustment accounts for the employer-equivalent share.
3. Calculate Social Security tax: 12.4% on the SE tax base, up to the wage base limit ($176,100 in 2025).
4. Calculate Medicare tax: 2.9% on the entire SE tax base (no cap).
5. Calculate Additional Medicare Tax: 0.9% on SE tax base exceeding $200,000 (Single), $250,000 (MFJ), or $125,000 (MFS).
6. Total SE Tax: Social Security + Medicare + Additional Medicare.

2025 Self-Employment Tax Rates & Thresholds

The 92.35% Factor Explained

The 92.35% multiplier is not a random number — it equals 100% minus 7.65% (half of 15.3%). W-2 employees only pay FICA on their wages, not on the employer's matching contribution. To give self-employed individuals equivalent treatment, the IRS reduces the taxable base by the employer-equivalent portion (7.65%), leaving 92.35%.

Who Must Pay Self-Employment Tax?

You must pay self-employment tax if you meet any of these criteria:

• Net self-employment earnings of $400 or more
• Freelancers, consultants, or independent contractors
• Sole proprietors or single-member LLC owners
• Partners in a partnership (on their distributive share)
• Gig economy workers (Uber, DoorDash, Etsy sellers, etc.)
• Anyone who received a 1099-NEC or 1099-K for services

Quarterly Estimated Tax Payments

Self-employed individuals generally must make quarterly estimated tax payments if they expect to owe $1,000 or more in tax. The 2025 quarterly due dates are:

• Q1 (Jan–Mar): April 15, 2025
• Q2 (Apr–May): June 16, 2025
• Q3 (Jun–Aug): September 15, 2025
• Q4 (Sep–Dec): January 15, 2026

Use IRS Form 1040-ES to calculate and pay your estimated taxes. Missing payments may result in underpayment penalties.

Self-Employment Tax Deductions & Strategies

Several strategies can help reduce your overall tax burden as a self-employed individual:

• Half of SE tax deduction: You can deduct 50% of your Social Security + Medicare tax as an above-the-line deduction. This reduces your adjusted gross income (AGI) for income tax purposes.
• SEP-IRA: Contribute up to 25% of net SE earnings (max $69,000 in 2025) to reduce taxable income.
• Solo 401(k): Contribute as both employee ($23,500 + $7,500 catch-up if 50+) and employer (25% of net earnings, max $69,000 total).
• HSA contributions: Up to $4,300 (individual) or $8,550 (family) in 2025 if enrolled in a high-deductible health plan.
• Business expense deductions: Home office, vehicle, health insurance premiums, equipment, professional development, and more.
• S-Corp election: For higher earners, electing S-Corp status allows splitting income between salary (subject to SE tax) and distributions (not subject to SE tax).