Self Employment Tax Calculator
Calculate self employment tax with our free Self employment tax Calculator. Compare rates, see projections, and make informed financial decisions.
Self Employment Tax Calculator
Calculator
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Formula: SE Tax = Net Income × 92.35% × 15.3% (12.4% SS + 2.9% Medicare)
Worked example — $11,304 SE tax
Formula
SE Tax = Net Income × 92.35% × 15.3% (12.4% SS + 2.9% Medicare)
Self-employed individuals pay both employer and employee portions of FICA. The 92.35% factor accounts for the employer-equivalent deduction. SS cap: $168,600 (2024).
Worked Examples
Example 1: $80K net income
Problem:Net SE income: $80,000
Solution:Base: $73,880 × 15.3% = $11,304
Result:$11,304 SE tax
Frequently Asked Questions
Why is SE tax ~15.3%?
Employees pay 7.65% FICA and employers match it. Self-employed pay both halves (15.3%). You can deduct half as a business expense.
What is the Social Security wage base for self-employment tax?
For 2024, the Social Security portion of SE tax (12.4%) only applies to net earnings up to $168,600. Above this threshold, you only pay the 2.9% Medicare portion with no cap. High earners above $200,000 also pay an additional 0.9% Additional Medicare Tax on the excess.
Can I reduce my self-employment tax with a business structure?
Yes. By forming an S-corporation and paying yourself a reasonable salary, only the salary portion is subject to SE tax. Profits distributed above the salary as owner distributions are not subject to SE tax, though they are subject to income tax. This strategy can save thousands annually for higher earners but involves additional accounting and compliance costs.
Do I pay SE tax on all business income?
SE tax applies to net self-employment income from a trade or business. The calculator applies the 92.35% factor because you deduct half the SE tax before computing SE income, which approximates the employer-equivalent deduction. Passive rental income is generally not subject to SE tax unless you are a real estate professional.
How does the deductible half of SE tax differ from the qualified business income deduction?
They are two separate breaks. Half of your SE tax is an above-the-line adjustment that lowers adjusted gross income and therefore income tax, but it never lowers the SE tax itself. The qualified business income deduction is taken separately against taxable income for eligible pass-through business profit and likewise leaves SE tax untouched. Self Employment Tax Calculator shows only the SE tax and its deductible half; the QBI deduction is computed elsewhere on the return.
Do I still owe the Social Security portion if I also have a W-2 job?
Your W-2 wages are counted first against the annual Social Security wage base. Only the remaining room in that base is available for the Social Security portion of your self-employment earnings, so someone whose wages already exceed the base pays no additional 12.4% on their side business. The 2.9% Medicare portion has no cap and applies to all net earnings, and the Additional Medicare Tax applies once combined wages and SE income cross the filing-status threshold.
How do quarterly estimated payments relate to self-employment tax?
No one withholds tax from a Schedule C profit, so self-employed filers generally pay both income tax and SE tax through quarterly estimated instalments on Form 1040-ES. Underpayment penalties are avoided by meeting a safe harbour based on either the current year liability or the prior year total, with a higher prior-year percentage for higher incomes. Using the SE tax figure here plus your expected income tax gives a reasonable starting instalment.
What is the difference between gross receipts and the net earnings this tax is based on?
SE tax is not charged on revenue. You first subtract ordinary and necessary business expenses on Schedule C to reach net profit, then multiply by 92.35% to get net earnings from self-employment, which is the figure the 12.4% and 2.9% rates are applied to. Legitimate Schedule C deductions such as mileage, home office and supplies therefore reduce SE tax as well as income tax, which is why clean expense records matter. The self-employed health insurance deduction works differently: it is taken after Schedule C and lowers income tax only, leaving SE tax unchanged.
Does paying self-employment tax build Social Security benefits?
Yes. Reported net earnings from self-employment are posted to your Social Security earnings record exactly as wages are, earning quarters of coverage toward eligibility and feeding the averaged indexed earnings used to compute a future retirement or disability benefit. Aggressively minimising reported profit, or paying yourself an unreasonably small S-corporation salary, lowers today's tax but also lowers the earnings history your benefit is later calculated from.
How are losses and multiple businesses treated?
Net earnings are computed across all your self-employment activities combined, so a loss in one sole proprietorship offsets profit in another before the rates are applied. If the combined result is zero or negative there is no SE tax and no Social Security credits for that year. General partnership income reported on a K-1 is normally included in net earnings, whereas S-corporation distributions are not, which is the basis of the salary-versus-distribution planning discussed above.
References
Reviewed for accuracy by Sahil, Senior Finance & Tax Editor · Editorial policy
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