What This Calculator Estimates
Self-employment tax (in the US, covering Social Security and Medicare contributions) applies to net self-employment income, and because self-employed individuals act as both 'employer' and 'employee,' they generally pay both halves of these contributions rather than splitting them with an employer as traditional employees do. Because rates, thresholds, and rules vary by country for self-employed individuals, this calculator lets you enter your applicable rate to estimate the contribution on your net self-employment earnings.
How to Use This Calculator
- Enter estimated net self-employment income after business expenses.
- Enter the self-employment tax rate you want to test.
- Click Estimate Tax to calculate the tax amount.
- Review the amount left after that tax in the detail line.
- Recalculate if your income or assumed rate changes.
Formula / Method Used
- Estimated self-employment tax = Net self-employment income x Tax rate
- Estimated income after self-employment tax = Net self-employment income - Estimated self-employment tax
Worked Example
If net self-employment income is $80,000 and the tax rate is 15.3%, the estimated self-employment tax is $12,240. The amount left after that tax is about $67,760.
What the Result Means
The result is the estimated self-employment tax based on the simple rate you entered. The detail line shows the estimated amount left after that tax, which can help with cash-flow planning.
Common Mistakes
- Entering gross revenue instead of net self-employment income.
- Assuming self-employment tax is the same as total tax due.
- Ignoring thresholds, caps, deductions, or deductible portions of the tax.
- Using last year's rate assumptions after rules change.
Official References
Related Calculators
Tips for a More Accurate Estimate
- Confirm your net self-employment income (after business expenses) before applying a rate.
- Remember you're generally covering both the employee and employer share of these contributions.
- Check whether your jurisdiction allows a deduction for part of this tax when calculating income tax.
- Recheck the current wage base limit, since contributions may cap above a certain income level.
- Set aside estimated payments quarterly if required, to avoid underpayment penalties.
Frequently Asked Questions
Why do self-employed people pay more in payroll-style taxes than employees?
Traditional employees split Social Security/Medicare (or equivalent) contributions with their employer, while self-employed individuals are responsible for both the 'employee' and 'employer' portions, effectively doubling the headline contribution rate.
Is self-employment tax the same as income tax?
No, self-employment tax specifically covers Social Security and Medicare-style contributions (in the US) and is separate from regular income tax owed on your profits.
Can self-employed individuals deduct part of this tax?
In the US, self-employed individuals can typically deduct half of their self-employment tax when calculating adjusted gross income — check current IRS rules for exact treatment.
Does this apply only to US self-employed individuals?
The specific 'self-employment tax' terminology is US-focused, but similar concepts (higher social security contributions for self-employed workers) exist in many countries — enter the rate applicable to your jurisdiction.
Where can I confirm current official rates and thresholds?
In the US, the IRS publishes current self-employment tax rates and the wage base limit for the Social Security portion; other countries' tax or social security authorities publish their equivalents.
General Disclaimer
This calculator provides self-employment tax estimates only and is not tax, legal, payroll, or accounting advice. Final obligations depend on current law, other income, deductions, and filing details.
Last updated: May 22, 2026