1099 Self-Employment Tax Calculator
Calculate your 1099 self-employment tax, estimated quarterly payments, and total tax liability. For freelancers, contractors, gig workers, and sole proprietors.
Uses 2026 IRS tax brackets, standard deductions and the Social Security wage base
Self-Employment Income
Total income before expenses
Deductible business expenses
Filing Status
Other Income (Optional)
Employment income (taxes already withheld)
Tax Summary
15.3% on 92.35% of net SE income (Social Security 12.4% + Medicare 2.9%)
Based on Single brackets after deductions
Quarterly Estimated Payments
To avoid penalties, pay estimated taxes quarterly:
Jan 1 - Mar 31
Apr 1 - May 31
Jun 1 - Aug 31
Sep 1 - Dec 31
Note: Pay via IRS Direct Pay or Form 1040-ES. Missing payments may result in underpayment penalties.
Tax Rates
Deductions Applied
- Half of SE tax deducted: $0
- Standard deduction (Single): $16,100
- Qualified business income (QBI) deduction: $0
Self-Employment Tax Guide
How Self-Employment Tax Works
When you're self-employed, you pay both the employer and employee portions of Social Security and Medicare taxes. This is called self-employment tax (SE tax).
The SE Tax Calculation
- Start with net self-employment income (gross - expenses)
- Multiply by 92.35% (this is the taxable SE base)
- Apply 15.3% SE tax rate (12.4% Social Security + 2.9% Medicare)
- Deduct half of SE tax from income for federal income tax
Social Security (12.4%)
Applies to earnings up to $184,500 in 2026. If you also have W-2 wages, they count toward that cap first.
Medicare (2.9%)
There is no cap. An extra 0.9% applies to earnings over $200,000 (single or head of household), $250,000 (married filing jointly) or $125,000 (married filing separately), and W-2 wages count toward those amounts first.
Quarterly Payment Due Dates
Q1
April 15
Q2
June 15
Q3
Sept 15
Q4
Jan 15
Why the 92.35% Factor Exists
The 92.35% multiplier is not arbitrary. Employees never pay Social Security and Medicare tax on their employer's half of those contributions, and that employer half is a business expense. To keep the self-employed on roughly equal footing, the IRS lets you first remove an equivalent portion of your net earnings before applying the 15.3% rate. Multiplying net income by 0.9235 (which is 1 minus half of 15.3%) produces the "net earnings from self-employment," and that smaller figure is what the SE tax rate is actually applied to. If your net earnings from self-employment are below $400, you generally owe no SE tax at all.
The Deductible Half
Because you shoulder both halves of Social Security and Medicare, the IRS lets you deduct the "employer" half of your SE tax when figuring your federal income tax. This is an above-the-line adjustment, so you get it whether or not you itemize. In the summary above, this appears as "Half of SE tax deducted." It lowers your taxable income for the income-tax calculation, but it does not lower the SE tax itself: the two taxes are computed separately and then added together to reach your total liability.
The QBI Deduction
Most freelancers and sole proprietors can also take the qualified business income (QBI) deduction, which takes up to 20% of your business profit off your taxable income. The calculator works it out as 20% of your net profit minus the deductible half of SE tax, and it can't be more than 20% of your taxable income. Above $201,750 of taxable income ($403,500 if married filing jointly) the deduction starts to shrink and it's gone completely $75,000 later ($150,000 for joint filers). From 2026 there's also a minimum deduction of $400 if your business profit is at least $1,000. The QBI deduction lowers your income tax only, not your SE tax.
What the Calculator Simplifies
- Above the QBI income threshold, the deduction is phased out as if you have no employees and no business property. If you pay wages or own equipment, your real deduction may be larger, so check Form 8995-A.
- It uses the standard deduction, so if you itemize, your income tax may come out lower. Other deductions such as retirement contributions or health insurance premiums aren't included either.
- Quarterly payments are your estimated total divided by four. The IRS safe harbor rules (paying 100% of last year's tax, or 110% if your income was over $150,000) can mean you owe less each quarter.
Sources (2026 Tax Year)
- IRS, Self-employment tax (Social Security and Medicare taxes): the 15.3% rate (12.4% Social Security, 2.9% Medicare), the 92.35% factor, the $400 minimum and the deduction for half of SE tax.
- IRS, Schedule SE (Form 1040) and its instructions, including how W-2 wages reduce the Social Security base, and Form 8959 for the Additional Medicare Tax.
- Social Security Administration, Contribution and benefit base: $184,500 for 2026.
- IRS, Tax inflation adjustments for tax year 2026 (Rev. Proc. 2025-32): income tax brackets, standard deductions and the QBI thresholds for all four filing statuses.
- IRS, Qualified business income deduction and Form 8995.
- IRS, Form 1040-ES: estimated tax and quarterly due dates.
Estimates Only: Not Tax or Financial Advice
This calculator provides rough estimates for planning purposes using 2026 federal figures. It does not account for state and local taxes, tax credits, itemized deductions, retirement contributions, health insurance deductions, or many other factors that affect your real liability. It is not a substitute for professional advice. Verify amounts against the current IRS guidance (Schedule SE and Form 1040-ES) and consult a qualified tax professional or CPA before making payments or filing decisions. See our disclaimer.
Frequently Asked Questions
What exactly is self-employment tax?
Self-employment tax covers Social Security and Medicare for people who work for themselves. It totals 15.3%: 12.4% for Social Security plus 2.9% for Medicare. Employees split these taxes with their employer, but when you are self-employed you pay both halves yourself, which is why the combined rate feels high compared with the 7.65% withheld from a paycheck.
Why is the tax applied to only 92.35% of my income?
The IRS lets you exclude the equivalent of the employer half before applying the rate, so your net earnings from self-employment equal net profit times 0.9235. This keeps the self-employed roughly even with employees, whose employer contribution is never itself taxed. The 15.3% rate is then applied to that reduced figure.
Do I really have to pay taxes four times a year?
If you expect to owe $1,000 or more, the IRS generally requires quarterly estimated payments via Form 1040-ES or IRS Direct Pay, due in April, June, September, and January. Paying quarterly avoids the underpayment penalty. This tool divides your estimated liability into four equal installments as a starting point.
Can I lower my self-employment tax?
The most direct lever is legitimate business expenses: every deductible dollar of expense reduces the net profit that SE tax is calculated on. Retirement contributions, a home-office deduction, and health-insurance premiums can also reduce your income tax. Some higher earners elect S-corporation status to reduce SE tax, but that adds payroll and compliance obligations, so discuss it with a tax professional.
Does the Social Security portion ever stop?
Yes. The 12.4% Social Security portion only applies up to an annual wage base ($184,500 for 2026), and any W-2 wages you earned count against that cap first. The 2.9% Medicare portion has no cap, and an extra 0.9% Medicare surtax applies to earnings above $200,000 (single or head of household), $250,000 (married filing jointly) or $125,000 (married filing separately).
Is this calculator accurate enough to file my taxes?
Treat it as a planning estimate, not a filing figure. It uses 2026 federal brackets, standard deductions and the QBI deduction but leaves out state taxes, credits, itemized deductions and many personal factors. Always confirm your numbers with Schedule SE, the latest IRS instructions, and a qualified tax professional before filing or making payments.
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