Private Self-Employment Tax Estimator — No Data Stored
Estimate your self-employment tax for the US (Social Security + Medicare) or UK (National Insurance). 100% confidential — your income data stays on your device and is never transmitted anywhere.
How Self-Employment Tax Works
When you are self-employed, you pay both the employer and employee portions of payroll taxes. In the US, this means paying the full 15.3% for Social Security and Medicare, rather than the 7.65% employees pay. In the UK, self-employed individuals pay Class 2 and Class 4 National Insurance contributions.
US Self-Employment Tax Breakdown
- Social Security: 12.4% on net earnings up to $168,600 (2024)
- Medicare: 2.9% on all net earnings
- Additional Medicare: 0.9% on earnings over $200,000 (single) / $250,000 (married)
- Total SE tax rate: 15.3% (below SS cap)
UK National Insurance for Self-Employed
- Class 2 NI: £3.45/week flat rate (if profits above £12,570)
- Class 4 NI: 9% on profits between £12,570 and £50,270
- Class 4 NI (upper): 2% on profits above £50,270
Deductible Portion of SE Tax
In the US, you can deduct half of your self-employment tax from your gross income for income tax purposes. This is known as the "employer-equivalent" portion. This calculator shows the gross SE tax; consult a tax professional for your full income tax situation.
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Your income figures are processed entirely in your browser using JavaScript. No data is sent to any server, no cookies track your financial information, and nothing is stored after you close this page. This tool is designed for people who value confidentiality in their financial planning.