Self-Employment Tax Calculator: How to Calculate SE Tax in 2026

Short answer: self-employment (SE) tax is 15.3% of 92.35% of your net self-employment profit. That 15.3% is two pieces: 12.4% for Social Security and 2.9% for Medicare. It is a completely separate tax from federal income tax — you pay both. You owe SE tax the moment your net self-employment earnings reach $400 for the year.

Use the free Freelance Rate Calculator → to set rates that cover this tax up front, then read on to see exactly how the SE tax math works so the number never surprises you at filing time.

How self-employment tax is calculated, step by step

The reason a self-employment tax calculator exists is that you don't apply 15.3% straight to your profit. You first shave off 7.65% (you're taxed on 92.35% of profit, which mirrors how an employer's share isn't counted as employee wages). Here is the full sequence with a worked example using $70,000 of net profit from your Schedule C.

1. Net earnings from self-employment: profit × 0.9235 = $70,000 × 0.9235 = $64,645. This is your SE-taxable base.
2. Social Security portion (12.4%): applies to net earnings up to the annual Social Security wage base (2025 = $176,100; it rises most years). Since $64,645 is below the base, it's $64,645 × 0.124 = $8,016.
3. Medicare portion (2.9%): applies to all net earnings with no cap. $64,645 × 0.029 = $1,875.
4. Total SE tax: $8,016 + $1,875 = $9,891.
5. Deduct one half: you take half of the SE tax — $9,891 ÷ 2 = $4,945 — as an above-the-line adjustment to income, lowering the income that federal income tax is calculated on.

The same example as a table:

Don't do this math by hand every quarter. Open the free Freelance Rate Calculator → to build SE tax into the rate you quote clients, so the 15.3% is already covered before the money lands.

The Social Security wage base cap — and when it matters

Social Security tax only applies up to an annual ceiling, the wage base ($176,100 in 2025, indexed up each year). Once your net SE earnings pass the base, the 12.4% Social Security portion stops — but the 2.9% Medicare portion keeps going on every dollar, with no cap.

On top of that, high earners owe an Additional Medicare Tax of 0.9% on earnings above $200,000 (single) or $250,000 (married filing jointly). So very high earners effectively pay 3.8% Medicare on the top slice. For the example above, none of these thresholds are reached, so the flat 15.3% blend applies cleanly. If you're earning well into six figures, this is exactly where a full freelance tax calculator earns its keep.

Where SE tax is reported and when you pay it

Your business income and expenses go on Schedule C, which produces your net profit. That profit flows into Schedule SE, where the self-employment tax is actually calculated and added to your Form 1040. You don't pay it once a year, though — the IRS expects it through quarterly estimated taxes, due roughly:

• April 15 (Q1)
• June 15 (Q2)
• September 15 (Q3)
• January 15 of the following year (Q4)

Each quarterly payment should cover both your SE tax and your federal income tax for that period. Miss them and you can owe an underpayment penalty even if you settle up in April. To see the combined picture — SE tax plus income tax brackets — use the freelance tax calculator, and price your work so the cash is set aside as you earn it with the freelance hourly rate calculator.

What counts as self-employment income

SE tax isn't only for people who call themselves "freelancers." You owe it on net earnings from any trade or business you run as an individual: sole proprietors and single-member LLCs, independent contractors paid on a 1099-NEC, gig and platform workers, consultants, and most general partners in a partnership. That's why a 1099 tax calculator and a self-employment tax calculator are really the same tool — the 1099 income is what feeds the Schedule C profit that Schedule SE taxes.

A few things that are not subject to SE tax: W-2 wages (your employer already withheld the matching payroll tax), most rental real estate income, and ordinary investment income like interest, dividends and capital gains. If you have a mix of W-2 and self-employment income in the same year, only the self-employment slice goes through Schedule SE — but the wage base is shared, so W-2 Social Security wages count toward that $176,100 ceiling before your SE earnings do.

Why SE tax feels like a double tax (and the silver lining)

If you've only ever been a W-2 employee, you split the 15.3% with your employer: you each paid 7.65%, and the employer's half was invisible on your paycheck. As your own boss, you are both the employer and the employee, so you pay the full 15.3% yourself. That's why it stings.

The silver lining: you get to deduct half of your SE tax ($4,945 in the example) as an adjustment to income, which lowers your federal income tax. It doesn't erase the SE tax, but it softens the blow — and it's automatic on Schedule SE, so you don't lose it by forgetting to itemize.

Quick reference: SE tax by net profit

All of the figures below are under the Social Security wage base, so the full 15.3% applies to the 92.35% SE-taxable base. (Round dollars; rates and the wage base change yearly.)

Notice the SE tax scales almost linearly here — that's the whole point of setting aside roughly 14–15 cents of every profit dollar for SE tax alone, before you've touched income tax. A clean freelancer invoice template plus disciplined rate-setting (see how to set freelance rates) makes that habit painless.

Legitimate ways to reduce self-employment tax

SE tax is based on net profit, so the honest levers are about lowering net profit through real deductions or restructuring:

• Claim every legitimate business deduction. Home office, software, mileage, equipment, health insurance and retirement contributions all reduce net profit, and a lower net profit means a lower SE tax base.
• Consider an S-corporation election (advanced). An S-corp lets you split income into a "reasonable salary" (subject to payroll tax) and distributions (not subject to SE tax), which can cut the total. It also adds payroll, paperwork, and IRS scrutiny on what counts as "reasonable." This is genuinely a talk-to-a-CPA decision — it doesn't make sense for everyone, and getting the salary wrong invites trouble.

Be skeptical of anything that promises to make SE tax disappear. The rate, the 92.35% base, and the half-deduction are fixed by law; the only honest moves are real deductions and, for some, the S-corp structure.

How much to set aside from every payment

A practical rule keeps you out of trouble between quarters: when a client payment lands, move a fixed share of your profit straight into a separate tax account. SE tax alone is about 14.1% of net profit for most freelancers under the wage base (15.3% applied to 92.35%), so set-aside math has to start there and then add federal income tax on top.

For a freelancer in a middle income-tax bracket, a combined set-aside of roughly 25–30% of profit usually covers both SE tax and federal income tax — higher if you're in a high-tax state with its own income tax. Using the $70,000 example: $9,891 of that is SE tax, and your federal income tax sits on top of it (reduced by the $4,945 half-deduction). The exact split depends on your bracket, deductions and filing status, which is why the freelance tax calculator is worth running once your year takes shape rather than guessing a single percentage.

The discipline matters more than the precision. Freelancers who set aside per payment rarely scramble at quarterly deadlines; those who wait until April to "see how the year went" are the ones who get hit with both a big bill and an underpayment penalty at the same time. For a full breakdown of the right percentage by income level, see how much to set aside for freelance taxes.

Stop guessing your tax set-aside

The free calculator helps you price work that covers your taxes. When you want to project the actual dollars, the $9 Freelance Rate & Tax Calculator spreadsheet has a dedicated Self-Employment Tax tab — type in your net profit and it returns your SE tax, the deductible half, and your blended rate — plus a Quarterly Planner that splits the year into the four estimated-payment due dates so you always know what to send. Want the invoicing and rate worksheets too? Get everything in the $14 bundle →

Frequently asked questions

How is self-employment tax calculated?

Multiply your net self-employment profit by 0.9235 to get your SE-taxable earnings, then apply 15.3% (12.4% Social Security up to the annual wage base, plus 2.9% Medicare on all of it). On $70,000 of profit that's $64,645 × 15.3% = $9,891, and you can deduct half ($4,945) as an adjustment to income.

What is the self-employment tax rate for 2026?

The self-employment tax rate is 15.3% — 12.4% for Social Security plus 2.9% for Medicare — applied to 92.35% of your net profit. The Social Security portion only applies up to the annual wage base (which rises each year), while Medicare has no cap. Always confirm the current year's wage base and rates at irs.gov.

Do I pay self-employment tax AND income tax?

Yes. SE tax and federal income tax are separate. SE tax covers your Social Security and Medicare contributions; federal income tax is calculated on your taxable income using the regular brackets. You owe both, though half of your SE tax reduces the income that income tax is figured on.

When do I have to pay self-employment tax?

You owe SE tax once net self-employment earnings reach $400 for the year. It's reported on Schedule SE with your annual return, but the IRS expects payment through quarterly estimated taxes due around April 15, June 15, September 15, and January 15.

How can I lower my self-employment tax?

Because SE tax is based on net profit, claiming every legitimate business deduction lowers the base. For higher earners, electing S-corporation status can reduce the SE-taxable portion by splitting pay into salary and distributions — but it adds cost and complexity, so talk to a CPA before doing it.