How this self-employment tax calculator works
Enter your expected net profit for 2026 — what's left after deductible business expenses — and your filing status. If you also have a W-2 job, add those wages so the calculator can apply the Social Security wage base correctly.
The calculator multiplies your profit by 92.35% to get net earnings from self-employment, then applies 12.4% Social Security tax up to the $184,500 wage base and 2.9% Medicare tax on everything. High earners also see the 0.9% Additional Medicare Tax.
Half of your self-employment tax is deducted before federal income tax is figured. We then subtract the 2026 standard deduction and run the remaining income through the 2026 federal brackets for your filing status.
Finally, we add your optional state estimate, show the total you should set aside and split it into four equal estimated payments with their IRS due dates.
The self-employment tax formula
Self-employment tax replaces the payroll taxes an employer would split with you:
SE tax = 12.4% × min(0.9235 × profit, wage base − W-2 wages) + 2.9% × 0.9235 × profit
- 0.9235 = 1 − 7.65%, mirroring the employer share an employee never sees
- Wage base 2026 = $184,500 (Social Security portion only)
- Taxable income = profit − ½ SE tax − standard deduction
- Quarterly payment = (SE tax + income tax + state estimate) ÷ 4
Worked example
Maya is a single freelance designer expecting $85,000 of net profit in 2026 and no other job.
Her net earnings from self-employment are $85,000 × 92.35% = $78,497.50. Social Security tax is 12.4% of that ($9,733.69) and Medicare is 2.9% ($2,276.43), for a self-employment tax of $12,010.12.
She deducts half, $6,005.06, plus the $16,100 standard deduction, leaving $62,894.94 of taxable income. Federal income tax on that is about $8,548.89, with her top dollars in the 22% bracket.
Her total federal set-aside is roughly $20,559 — about 24% of profit — or $5,139.75 for each of the four quarterly payments.
What self-employment tax actually is
When you work for an employer, Social Security and Medicare taxes are split: 7.65% comes out of your paycheck and your employer quietly pays another 7.65%. When you work for yourself, you are both employee and employer, so you pay the full 15.3%. That combined bill is called self-employment tax, and it is reported on Schedule SE alongside your Form 1040.
It is separate from income tax. Many new freelancers are surprised that someone in a low income tax bracket can still owe a meaningful bill, because self-employment tax starts on the first dollar of net earnings above $400 — there is no standard deduction against it.
Why only 92.35% of your profit is taxed
Employees never pay payroll tax on their employer's 7.65% share. To put the self-employed on equal footing, the IRS lets you multiply net profit by 92.35% before calculating self-employment tax. On $85,000 of profit, that removes about $6,500 from the base.
On top of that, you can deduct half of your self-employment tax when figuring adjusted gross income. That deduction lowers your income tax, not the self-employment tax itself, and you get it whether or not you itemize.
The Social Security wage base and side gigs
The 12.4% Social Security portion stops once your combined wages and net self-employment earnings reach $184,500 in 2026. The 2.9% Medicare portion never stops, and above $200,000 for single filers ($250,000 married filing jointly, $125,000 married filing separately) an extra 0.9% Additional Medicare Tax applies.
If you have a day job, your W-2 wages use up the wage base first. Someone earning $170,000 in salary with $40,000 of freelance profit only pays the 12.4% on the remaining $14,500 of room, which is why this calculator asks for wages.
How much to set aside from every payment
A simple habit beats a perfect formula: move a fixed share of every client payment into a separate tax savings account the day it lands. For most US freelancers with moderate profits and no state income tax, 25% to 30% of profit covers federal obligations. Add your state rate on top if you live somewhere with an income tax.
Use the 'Share of profit to set aside' result above as your personal percentage, and recheck it whenever your income changes by more than about 20%.
Quarterly estimated payments and penalties
Because no employer withholds for you, the IRS expects you to pay during the year through Form 1040-ES. For tax year 2026 the due dates are April 15, June 15 and September 15, 2026, and January 15, 2027. When a date falls on a weekend or federal holiday, it moves to the next business day.
You can generally avoid the underpayment penalty if your payments cover at least 90% of this year's tax or 100% of last year's total tax (110% if your prior-year adjusted gross income was over $150,000). Paying 100% or 110% of last year's tax in four equal parts is the easiest safe harbor when your income is rising.
Legal ways to lower the bill
Every legitimate business expense reduces both income tax and self-employment tax, so track software, equipment, a qualifying home office, mileage and professional fees carefully. Contributions to a SEP-IRA or Solo 401(k) and self-employed health insurance premiums cut income tax, although they do not reduce self-employment tax.
Many sole proprietors also qualify for the Qualified Business Income deduction of up to 20% of business income, which this estimate deliberately leaves out to stay conservative. As profits grow, an S corporation election can reduce payroll taxes, but it brings payroll costs and a reasonable-salary requirement — a conversation for a tax professional.
Frequently asked questions
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Not financial advice. ClearCalc provides estimates for educational purposes only. Results depend on the assumptions you enter and may differ from offers from lenders or institutions. Consult a qualified professional before making financial decisions.