2026 Self-Employment Tax Calculator
Calculate your 2026 self-employment tax with the proper Schedule SE math: 15.3% on 92.35% of net earnings, the $184,500 Social Security cap, the additional Medicare tax for high earners, and the 50% deduction. Plus an S Corp savings comparison.
Last updated: April 2026 · Source: IRS Schedule SE, SSA 2026 wage base
Total revenue before expenses
Schedule C deductions: home office, mileage, supplies, etc.
From a separate employer. Counts toward $184,500 SS cap.
How self-employment tax actually works
Self-employment tax exists because W-2 employees and their employers split the FICA payroll tax burden 50/50. When you work for yourself, you are both the employee and the employer, so you owe both halves: a total of 15.3%. The IRS calls this SECA (Self-Employment Contributions Act) but most people just call it SE tax.
The 92.35% adjustment. Before applying the 15.3% rate, the IRS multiplies your net earnings by 0.9235. This adjustment exists to put you on par with W-2 employees, whose employer FICA share is paid as a business expense and not counted as their wages. Mathematically: 1 - 0.0765 = 0.9235. Without this adjustment, you would be taxed on income that does not exist for W-2 workers, which would be unfair.
Worked example. You earn $100,000 in gross self-employment income with $20,000 in deductible business expenses. Net profit: $80,000.
× 92.35% adjustment: $73,880.00
Social Security (12.4%): $ 9,161.12
Medicare (2.9%): $ 2,142.52
Total SE tax: $11,303.64
Half deductible on Schedule 1: $ 5,651.82
Effective SE tax rate: 14.13%
The 14.13% effective rate is what actually hits your wallet on every dollar of net profit. Not 15.3%, because of the 92.35% adjustment. That difference matters when planning quarterly estimated payments — most online guides quote 15.3% and overstate the burden.
2026 SE tax breakdown
| Component | Rate | Wage cap | Notes |
|---|---|---|---|
| Social Security (OASDI) | 12.4% | $184,500 | Both employee + employer halves |
| Medicare (HI) | 2.9% | No cap | All net SE earnings |
| Total SE tax | 15.3% | SS portion capped | On 92.35% of net earnings |
| Additional Medicare | 0.9% | Over $200K/$250K | High earners only, no inflation adjustment |
| 50% deductible | -7.65% | - | Above-the-line on Schedule 1 |
Three real self-employment scenarios
1. The freelance writer at $50,000
Sarah is a freelance writer earning $58,000 in gross income with $8,000 in deductible expenses (software, home office, professional dues). Net profit: $50,000. Adjusted earnings: $46,175. SE tax: $50,000 × 92.35% × 15.3% = $7,065. Half deductible: $3,533 reduces her AGI. At a 22% bracket, that saves another $777 in income tax. Total taxes (SE + income): roughly $13,000 on $50K net profit = 26%.
2. The consultant at $150,000 (S Corp territory)
Marcus is a marketing consultant with $180,000 gross / $30,000 expenses / $150,000 net. As a sole proprietor, his SE tax is $150,000 × 92.35% × 15.3% = $21,194. If he elected S Corp tax treatment with a $90,000 reasonable salary and $60,000 distributions, his payroll tax would be only $90,000 × 15.3% = $13,770 — saving $7,424/year minus ~$1,500 in additional S Corp admin costs. Net annual savings: $5,924. The S Corp election pays for itself quickly at this income level.
3. The high earner past the SS cap
Lisa is a freelance attorney with $250,000 net SE income. Adjusted: $230,875. Social Security: capped at $184,500 (the 2026 limit), so SS tax = $184,500 × 12.4% = $22,878. Medicare on full $230,875: $6,695. Additional Medicare on $30,875 over $200K threshold: $278. Total SE tax: $29,851. Notice how the SS cap saves her significant money compared to Medicare which has no cap. She also strongly benefits from S Corp planning at this income level — potential savings of $10K+/year.
Common SE tax mistakes
1. Forgetting quarterly estimated payments
If you owe more than $1,000, the IRS expects quarterly payments. Missing them triggers underpayment penalties (currently around 8% APR). Pay April 15, June 15, September 15, and January 15.
2. Not tracking business expenses
Every legitimate dollar of expenses saves about 14 cents in SE tax plus your marginal income tax rate. Ignoring small expenses can cost thousands per year.
3. Skipping the S Corp analysis
Most freelancers earning over $60K-$70K can save $3K-$10K/year with an S Corp election. The setup costs are recovered in months. Talk to a CPA.
4. Forgetting the 50% SE tax deduction
This above-the-line deduction reduces your AGI and your federal income tax. It is automatic if you use tax software, but a surprising number of self-filers miss it.
5. Confusing SE tax with income tax
You owe both. SE tax is 15.3% on top of whatever ordinary income tax bracket you fall into. A self-employed person earning $80K can easily owe 30%+ in combined SE + federal income tax.
Frequently asked questions
What is self-employment tax and who has to pay it?
Self-employment tax (officially SECA — Self-Employment Contributions Act) is the self-employed person's version of FICA payroll taxes. W-2 employees pay 7.65% in FICA and their employer matches with another 7.65%. Self-employed people pay both halves themselves: a total of 15.3% on net earnings. You owe SE tax if your net self-employment earnings are $400 or more in the year. This includes freelancers, independent contractors, gig workers, sole proprietors, single-member LLC owners, and most partnership members.
How is self-employment tax calculated for 2026?
The IRS applies SE tax to 92.35% of your net earnings (gross income minus business expenses). This 92.35% adjustment exists to give self-employed people the same tax treatment as W-2 employees, who do not pay income tax on their employer's share of FICA. The 15.3% rate breaks down to 12.4% Social Security on the first $184,500 of adjusted earnings (the 2026 SS wage base, same as W-2) plus 2.9% Medicare on all adjusted earnings (no cap). High earners pay an additional 0.9% Medicare on amounts over $200,000 (single) or $250,000 (married joint).
Why is only 92.35% of my net earnings taxed?
It is a deduction designed to put self-employed individuals on par with W-2 employees. When you work for an employer, the employer pays half of your FICA (7.65%) as a business expense, which the IRS does not count as part of your taxable wages. Self-employed people would otherwise be paying SE tax on income that includes the "employer half" — which would be unfair. The 92.35% multiplier (1 - 0.0765 = 0.9235) carves out that equivalent portion before applying the 15.3% rate.
Can I deduct half of my self-employment tax?
Yes. You can deduct one-half of your SE tax as an above-the-line adjustment to income on Schedule 1 of Form 1040. This reduces your adjusted gross income (AGI), which lowers your federal income tax — but does NOT reduce the SE tax itself. On a $14,130 SE tax bill (typical for $100K net profit), the deduction is $7,065. At a 22% marginal income tax bracket, the deduction saves you about $1,554 in income tax. Important: this deduction does not include the additional 0.9% Medicare tax for high earners.
What is the $400 threshold?
You only owe SE tax if your net self-employment earnings are $400 or more in the year. Below that, you owe nothing. This is a hard threshold — at $399 in net earnings, you owe $0 in SE tax. At $400, you owe $400 × 92.35% × 15.3% = $56.50. The $400 threshold has not changed in decades. If you have multiple self-employment income sources, they combine for the $400 test. W-2 wages do not count toward this threshold — only self-employment income.
How does W-2 income interact with self-employment tax?
The $184,500 Social Security wage base applies to your COMBINED W-2 and self-employment income. If your W-2 wages are already $184,500 or more, you owe NO Social Security portion of SE tax (the cap is fully used by your W-2 employer). You still owe Medicare (2.9%) on your full SE earnings, with no cap. Example: $200,000 W-2 + $50,000 net SE income. Your SS portion of SE tax is $0 (cap already hit). Your Medicare portion: $50,000 × 92.35% × 2.9% = $1,339. Plus possible additional Medicare on the high-earner portion.
When are quarterly estimated tax payments due?
If you expect to owe $1,000 or more in federal taxes for the year, you generally must make quarterly estimated payments. The due dates: April 15, June 15, September 15 (of the current year), and January 15 (of the following year). You can avoid underpayment penalties by paying at least 90% of current year tax or 100% of prior year tax (110% if AGI > $150K). Use Form 1040-ES to make estimated payments. Most self-employed people set aside 25-35% of each payment received to cover both income tax and SE tax.
How can an S Corp election reduce my self-employment tax?
When you elect S Corp tax treatment for your LLC or corporation, you split your income into a "reasonable salary" (paid via W-2 with full FICA) and "distributions" (which are NOT subject to FICA or SE tax). Example: $120,000 net profit. As a sole prop, you pay $16,956 in SE tax. As an S Corp paying yourself a $65,000 salary and taking $55,000 as distributions, you pay $9,945 in payroll tax — saving $7,011/year. The catch: you must pay yourself a "reasonable salary" for your role (the IRS scrutinizes this), and S Corps have additional administrative costs (~$1,000-$3,000/year for payroll service and tax filing).
What is a "reasonable salary" for an S Corp?
The IRS requires S Corp owners to pay themselves a salary that is "reasonable" for the work they perform — comparable to what someone else would charge to do the same job. There is no bright-line rule, but common guidelines: 30-50% of net profit for service businesses, higher for businesses where you are the primary revenue generator. The IRS targets S Corps that pay obviously low salaries (e.g., $20,000 salary on $200,000 profit) for audit. Use comparable salary data from BLS or industry reports to support your figure. When in doubt, work with a CPA experienced in S Corp planning.
What business expenses can reduce my self-employment tax?
Every dollar of legitimate business expense reduces your net profit, which reduces your SE tax by about 14.1 cents (15.3% × 92.35%) on top of your marginal income tax savings. Common deductions: home office (simplified $5/sqft up to $1,500, or actual expenses), vehicle mileage (72.5¢/mile in 2026), business meals (50% deductible), software and subscriptions, professional development, health insurance premiums (100% deductible), retirement contributions, and self-employed health insurance. Track everything — even small deductions add up significantly.
Can I deduct retirement contributions to reduce SE tax?
It depends on the plan type. SEP IRA, SIMPLE IRA, and Solo 401(k) employer contributions reduce your net SE earnings (and therefore reduce SE tax). Solo 401(k) employee contributions and Traditional/Roth IRA contributions reduce your federal income tax but NOT your SE tax. The big SE tax saver is the SEP IRA: contribute up to 25% of net SE earnings (after the deduction for half of SE tax), capped at $72,000 for 2026. On $100K profit, a $20K SEP IRA contribution saves about $2,826 in SE tax plus $4,400+ in income tax.
How does this calculator handle the additional Medicare tax?
The calculator checks if your combined wages (W-2 + adjusted SE earnings) exceed $200,000 single / $250,000 MFJ / $125,000 MFS. If so, it adds 0.9% on the excess as Additional Medicare Tax. This tax is owed by the employee/self-employed individual only (no employer match), and the thresholds have not been adjusted for inflation since 2013. The calculator applies it to the SE portion of earnings, since W-2 employers handle their own Additional Medicare withholding separately. You may owe more or less when you file your full return.
Data sources: IRS Schedule SE instructions; IRC Section 1402 for net SE earnings definition; Social Security Administration 2026 contribution and benefit base ($184,500 wage base); IRC Section 1401 for SE tax rate structure; OBBBA July 2025 for permanent extension of QBI deduction.
Last updated: April 2026. SS wage base updates annually each October. SE tax rates have not changed since 1990.
Disclaimer: This calculator provides federal SE tax estimates only and is not tax advice. State self-employment taxes (where applicable), quarterly estimated payment penalties, and the QBI deduction are not included. The S Corp savings comparison assumes a simple "reasonable salary at 60% of net profit" estimate — your specific situation requires a CPA review. Consult a qualified tax professional for advice on S Corp elections and quarterly payments.