Self-Employment Tax Calculator – Your Real 2026 Bill, and the Deduction That Hands Half of It Back
When you work for yourself, you pay both halves of Social Security and Medicare – the famous 15.3%. But the real bill is lower than the headline, and a day job changes it again. Enter your net earnings and any W-2 wages and this page runs the actual Schedule SE maths in front of you: the 92.35% rule, the 2026 wage base of $184,500, the extra 0.9% Medicare tax, and the half of the tax you get to deduct on your income tax return.
Your earnings
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Your self-employment tax for 2026
Where the money goes
Your consolation: deduct half of it back
$7,064.78 comes off your adjusted gross income on Schedule 1, line 15 – half of the Social Security and Medicare part of the tax, yours whether or not you itemize. Roughly what that deduction is worth in income tax:
If you pay quarterly estimates
$3,532.39 per quarter is the self-employment tax share of your estimated payments (total divided by 4). Your Form 1040-ES payment also carries your income tax, so the cheque you write is bigger – this is the SE slice of it.
Reading your result honestly
Your $100,000.00 of net earnings is charged on $92,350.00 – the 92.35% rule removed $7,650.00 from the base first, which is why your effective rate is 14.13% rather than 15.3%. Half of the Social Security and Medicare part – $7,064.78 – comes back as a deduction against your income tax. And remember: this tax is separate from income tax, and paying one does not cover the other.
Your Schedule SE, line by line
This is the shape of the IRS Schedule SE calculation, filled in with your numbers and updated live. If a tax program or a rival calculator gives you a different total, walk down this table and you will find the line where you disagree – it is usually line 5, the wage base room your W-2 job leaves behind.
| Schedule SE step | Amount |
|---|---|
| 1. Net self-employment earnings | $100,000.00 |
| 2. Multiply by 92.35% – the amount the tax is charged on | $92,350.00 |
| 3. Social Security wage base for 2026 | $184,500.00 |
| 4. Less W-2 wages already taxed for Social Security | $0.00 |
| 5. Wage base room left for your self-employment income | $184,500.00 |
| 6. Social Security tax: 12.4% of the smaller of lines 2 and 5 | $11,451.40 |
| 7. Medicare tax: 2.9% of line 2 (no cap) | $2,678.15 |
| 8. Additional Medicare tax: 0.9% of combined earnings over your threshold | $0.00 |
| 9. Total self-employment tax (lines 6 + 7 + 8) | $14,129.55 |
| 10. Deductible part: 50% of lines 6 and 7 – Schedule 1, line 15 | $7,064.78 |
Sources: Internal Revenue Service, Schedule SE (Form 1040) and Form 8959 (Additional Medicare Tax); Social Security Administration, 2026 wage base of $184,500 announced October 2025 (the 2025 base was $176,100). The additional Medicare tax in line 8 is figured on Form 8959 rather than Schedule SE – which is exactly why it is not part of the deductible half in line 10.
- Self-employment tax is charged on net earnings — what is left after business expenses, from Schedule C or Schedule F — not on receipts, so every legitimate expense lowers this tax as well as income tax.
- The base is cut to 92.35% to mimic the employer share an employee never sees, then 12.4% Social Security is charged up to whatever is left of the $184,500 wage base after W-2 wages, and 2.9% Medicare on top.
- The famous 15.3% headline overstates the real bill, and a day job changes it again — which is why the page runs the actual Schedule SE maths in front of you.
How it works, in 3 steps
Start with the profit, not the receipts
Self-employment tax is charged on net earnings – what is left after business expenses, from Schedule C or Schedule F. Every legitimate expense you deduct lowers this tax as well as your income tax.
Shrink it to 92.35%, then charge the parts
The base is cut to 92.35% to mimic the employer share an employee never sees. Then 12.4% Social Security is charged up to whatever is left of the $184,500 wage base after W-2 wages, 2.9% Medicare is charged on all of it, and 0.9% more lands on earnings above your threshold.
Deduct half, and pay in quarters
Half of the Social Security and Medicare part comes back as an adjustment to income on your tax return. The tax itself is usually paid through quarterly estimated payments, Form 1040-ES, alongside your income tax estimates.
The maths, with three earners worked in full
Example one – the default above. A freelancer with $100,000 of net earnings and no job. The base is $100,000 x 92.35% = $92,350. Social Security takes 12.4% of that, $11,451.40, and Medicare takes 2.9%, $2,678.15. Nothing crosses the $200,000 additional Medicare threshold. Total: $14,129.55 – an effective rate of 14.13%, not 15.3%, because the 92.35% rule shrank the base first. Half of the tax, $7,064.78, is deductible against income tax.
Example two – the side business next to a good job. The same $100,000 of self-employment profit, but also $150,000 of W-2 wages. The wages have already used $150,000 of the wage base, leaving only $34,500 of room – so Social Security is 12.4% of $34,500 = $4,278.00, not $11,451.40. Medicare is unchanged at $2,678.15. Combined earnings of $242,350 pass the $200,000 single threshold by $42,350, adding 0.9% on the self-employment slice of that excess: $381.15. Total: $7,337.30. A calculator that never asks about the day job overstates this bill by almost $6,800.
Example three – the high earner the cap protects. Net earnings of $300,000, single, no job. The base is $277,050. Social Security stops at the wage base: 12.4% of $184,500 = $22,878.00, the most anyone pays for 2026. Medicare keeps going at 2.9% of the full base, $8,034.45, and the 0.9% additional tax applies to the $77,050 above $200,000: $693.45. Total: $31,605.90 – an effective rate of just 10.54%. Past the cap, each extra dollar of profit is charged 2.9% plus the 0.9% surcharge, not 15.3%.
Deep dives
An employee never sees the full 15.3%. Their payslip shows 7.65% – 6.2% Social Security and 1.45% Medicare – and the employer quietly pays the same again on top. Work for yourself and there is no employer: Schedule SE charges you both halves, 12.4% and 2.9%. That is the whole reason the self-employment tax feels so heavy next to a payslip, and it is also what the money buys – the same Social Security credits and the same future benefit, earned on the same terms as an employee’s.
Two rules keep the comparison honest. First, the 92.35% factor: an employee is never taxed on the employer’s half, so your base is reduced by 7.65% before any rate is applied. Second, the deductible half: an employer deducts its share as a business expense, so you deduct half of the Social Security and Medicare part of your tax as an adjustment to income, on Schedule 1, line 15. It does not reduce the self-employment tax itself – it reduces the income tax charged on the same profit. Between them, the two rules are worth about $2,720 on $100,000 of net earnings compared with a naive 15.3% of the full amount.
One boundary on the softening: the additional 0.9% Medicare tax has no employer equivalent, so it gets neither a base reduction beyond the usual 92.35% nor a place in the deductible half. This calculator keeps it out of line 10 of the table for exactly that reason.
The $184,500 wage base is a single allowance shared by everything you earn from work in 2026 – every job and your business combined. Schedule SE handles its own side of the coordination automatically: W-2 wages go in first, and the 12.4% is charged only on the room remaining, which is why this page asks for them. Medicare, by contrast, has no cap at all, and the 0.9% additional tax is worked out on Form 8959 against your combined earnings and filing status.
Employers, though, cannot see each other. With two W-2 jobs, each employer withholds Social Security tax as if it were your only job, and if the two together pass $184,500 you will have too much withheld. That excess is not lost – it comes back as a credit on your Form 1040 – but it is yours to notice and claim, and plenty of people never do. The self-employment side never overpays this way, because the schedule does the netting for you.
Two smaller rules round out the picture. If your net self-employment earnings for the year are under $400, you generally owe no self-employment tax at all – the calculator zeroes itself and tells you. And farmers and some others can elect optional methods that deliberately report higher or lower earnings to protect benefit credits; those elections are beyond a calculator’s reach and belong in the Schedule SE instructions themselves.
Three earners, worked in full, for tax year 2026
Self-employment tax is Schedule SE, and its construction has exactly three steps, each of which the calculator displays separately so that an unexpected total can be traced to the step that produced it. First, shrink the net earnings to 92.35 percent, because the tax is charged on net earnings minus the employer’s half of the tax, expressed as a percentage, rather than on the full net figure. Second, charge Social Security at 12.4 percent on the shrunken figure, but only up to the 2026 wage base of $184,500 announced by the Social Security Administration in October 2025, shared with any W-2 wages, and charge Medicare at 2.9 percent on the whole shrunken figure, with no cap. Third, add the additional Medicare tax of 0.9 percent on the portion of the shrunken figure, plus any W-2 wages, above the filer’s threshold. This calculator covers federal tax only, for tax year 2026, and every figure below was produced by this page’s own calculator, so you can reproduce it by typing the same net earnings, W-2 wages and filing status in. This is general information about how Schedule SE works, not tax advice for any individual return.
| Earner (single, no W-2 job) | Taxable base (× 92.35%) | Social Security 12.4% | Medicare 2.9% | Additional 0.9% | Total SE tax | Effective rate |
|---|---|---|---|---|---|---|
| $50,000 net | $46,175.00 | $5,725.70 | $1,339.08 | $0.00 | $7,064.78 | 14.13% |
| $100,000 net (default) | $92,350.00 | $11,451.40 | $2,678.15 | $0.00 | $14,129.55 | 14.13% |
| $200,000 net | $184,700.00 | $22,878.00 | $5,356.30 | $0.00 | $28,234.30 | 14.12% |
| $250,000 net | $230,875.00 | $22,878.00 | $6,695.38 | $277.88 | $29,851.26 | 11.94% |
The first two rows show the headline rate working exactly as advertised, and why it is below 15.3 percent. At $50,000 of net earnings, the base is $46,175.00, Social Security is 12.4 percent of that, $5,725.70, Medicare is 2.9 percent, $1,339.08, and the total is $7,064.78, which is 14.13 percent of the net earnings, not 15.3 percent, because the 92.35 percent rule removed $3,825.00 from the base first. At the default $100,000, the same pattern doubles exactly: base $92,350.00, Social Security $11,451.40, Medicare $2,678.15, total $14,129.55, again 14.13 percent, and the deductible half of the Social Security and Medicare part is $7,064.78, which is the figure that comes back as an above-the-line deduction on the income tax return. That half is not a refund of the tax; it is a deduction against income tax, worth whatever the filer’s marginal income tax rate makes it worth, and the page is careful to describe it that way, because a deduction and a credit are different kinds of relief and confusing them overstates the benefit.
The $200,000 row is where the wage base first bites, and it bites in a subtle place. The taxable base is $184,700.00, which is $200 above the $184,500 wage base, so Social Security is charged on $184,500 only, giving $22,878.00, while Medicare, which has no cap, is charged on the full $184,700.00, giving $5,356.30. The additional Medicare line is $0.00, even though the net earnings are exactly $200,000, the single-filer threshold, because the calculator compares the shrunken base, $184,700.00, plus any W-2 wages, against the threshold, and $184,700.00 is below $200,000. The total is $28,234.30, at an effective rate of 14.12 percent, barely below the 14.13 percent of the lower rows, because only $200 of base has escaped Social Security so far. The $250,000 row shows the cap and the additional tax both fully engaged: Social Security stays at $22,878.00, because the wage base is exhausted, Medicare rises to $6,695.38 on the full $230,875.00 base, and the additional Medicare tax appears, at $277.88, which is 0.9 percent of the $30,875.00 by which the base exceeds the $200,000 threshold, giving a total of $29,851.26 at an effective rate of only 11.94 percent. The effective rate falls as earnings rise past the wage base, because each additional dollar past the base pays Medicare only, at 2.9 percent, plus the additional 0.9 percent where it applies, instead of the combined 15.3 percent headline, and that falling effective rate is the most important shape in the whole table for high earners to understand.
A W-2 job changes everything, and filing status changes one line
A W-2 job uses the same wage base first, and the calculator gives the self-employment Social Security charge only on the room the W-2 wages leave behind. Take $100,000 of net self-employment earnings with $100,000 of W-2 wages, as a single filer. The self-employment base is still $92,350.00, but Social Security is charged on only $84,500.00 of it, which is the $184,500 wage base minus the $100,000 already used by the W-2 job, giving $10,478.00 instead of the $11,451.40 charged with no W-2 job, while Medicare stays at $2,678.15 on the full base, and the total falls to $13,156.15, at an effective rate of 13.16 percent. Push the W-2 wages to $200,000, past the wage base entirely, and Social Security on the self-employment earnings falls to $0.00, because no room is left, while Medicare stays at $2,678.15 and the additional Medicare line rises to $831.15, which is 0.9 percent of the full $92,350.00 base, because the W-2 wages have already filled the $200,000 threshold, so the whole base counts for the additional tax. The total in that case is $3,509.30, at an effective rate of only 3.51 percent, which looks startling until the mechanism is seen: the Social Security part has already been paid through the W-2 job, so the self-employment bill is Medicare plus the additional tax only, and the two jobs together have paid Social Security exactly once, on the wage base, as the system intends.
Filing status, on this page, sets only one thing: the threshold for the additional 0.9 percent Medicare tax, $200,000 for single, head of household and qualifying surviving spouse filers, $250,000 for joint filers, and $125,000 if filing separately. The $250,000 single-filer total above, $29,851.26, becomes $29,573.38 as a joint filer, because the base of $230,875.00 is below the $250,000 joint threshold, so the additional Medicare line falls from $277.88 to $0.00, and nothing else changes: Social Security and Medicare are identical, because neither depends on filing status. At $300,000 of net earnings, the joint-filer additional line is $243.45, which is 0.9 percent of the $27,050.00 by which the $277,050.00 base exceeds the $250,000 threshold, giving a total of $31,155.90, while a married-filing-separately filer at the same earnings pays an additional $1,368.45, which is 0.9 percent of the $152,050.00 by which the same base exceeds the $125,000 separate threshold, giving a total of $32,280.90. The same earnings, the same business, three different additional-tax lines, differing only by the threshold the status sets, and the calculator’s status selector exists for exactly that line, which is why changing it changes nothing else on the page.
Two practical consequences follow, and both are worth stating before the quarterly-payment question, because they decide how much cash to keep aside. First, the deductible half is half of the Social Security and Medicare part only, not half of the total including the additional Medicare tax, which is why the default’s deductible half is $7,064.78, exactly half of $11,451.40 plus $2,678.15, with the additional line, $0.00 at the default, contributing nothing either way. Second, the quarterly estimated payment that carries the self-employment tax is the total divided by four for the self-employment slice alone: at the default, $14,129.55 divided by four is $3,532.39 per quarter, as the page’s own result states, and the cheque actually written each quarter is bigger, because the Form 1040-ES payment also carries income tax, which this calculator does not compute. Keep the self-employment slice separate in your own accounting, at $3,532.39 a quarter for the default earner, and the income tax slice separate beside it, and neither will surprise you at filing time. The sources behind the figures here are IRS Schedule SE for the construction, the Social Security Administration’s 2026 wage base of $184,500, announced in October 2025, replacing the 2025 base of $176,100, and the additional Medicare tax thresholds as stated above, all for tax year 2026, federal tax only.
Quarterly estimated payments: the four dates that matter
Self-employment tax is not withheld from anything, so it is paid through estimated tax payments, four times a year: April 15, June 15, September 15, and January 15 of the following year, for the preceding period’s income. The payment covers both income tax and self-employment tax together, on Form 1040-ES. Miss a payment or pay too little and the underpayment penalty applies, computed quarter by quarter — paying the whole year’s tax in April does not cure a missed January payment, because the penalty looks at each quarter separately.
The safe harbour is the practical rule most self-employed people use: pay at least 90% of the current year’s tax, or 100% of the prior year’s tax (110% if prior-year adjusted gross income exceeded $150,000), in four equal instalments, and no underpayment penalty applies even if the final bill is larger. When income is uneven — a big fourth quarter, say — the annualised income method lets you match payments to when income was actually earned, at the cost of a more complex form. The calculator estimates the annual figure; dividing it by four is the starting point, not the whole planning job.
The two deductions that soften the bill
Two features reduce the effective burden, and both are frequently misunderstood. First, only 92.35% of net self-employment earnings is subject to the tax, because the law lets you reduce net earnings by 7.65% — the employer-equivalent share — before applying the rate. On $100,000 of Schedule C profit, the taxable base is $92,350, and the tax is $14,130, an effective rate of 14.13% on the profit, not 15.3%. Second, you may deduct half of the self-employment tax paid as an adjustment to income on your return, which lowers income tax (though not the self-employment tax itself). On that same $100,000 of profit, the $7,065 deduction saves income tax at your marginal rate — $1,552 at a 22% marginal rate, for example.
Retirement contributions and the qualified business income deduction interact with the calculation in ways worth noting. The qualified business income deduction reduces income tax but does not reduce self-employment tax — the full net earnings remain subject to SE tax. Retirement contributions to a SEP IRA or Solo 401(k) reduce income tax and, for the employee portion of a Solo 401(k), are made from earnings that have already borne SE tax. Plan contributions for income-tax saving, not for SE-tax saving, and keep the two taxes conceptually separate.
Self-employment tax questions, answered
What is the self-employment tax rate in 2026?
The headline rate is 15.3%: 12.4% for Social Security plus 2.9% for Medicare. But it is not charged on every dollar you earn. It applies to 92.35% of your net self-employment earnings, and the 12.4% Social Security part stops at the 2026 wage base of $184,500 – W-2 wages from a job count toward that cap first. Above $200,000 of combined earnings ($250,000 married filing jointly, $125,000 married filing separately), an extra 0.9% Medicare tax applies. Put together, most freelancers pay an effective rate somewhere under the 15.3% headline: on this page’s default example, $100,000 of net earnings produces $14,129.55 of tax, an effective rate of 14.13%.
How is self-employment tax calculated?
In five moves, following Schedule SE. Start with your net self-employment earnings – profit after business expenses. Multiply by 92.35% to get the amount the tax is charged on. Charge 12.4% Social Security on that amount, up to what is left of the $184,500 wage base after any W-2 wages. Charge 2.9% Medicare on the whole amount, with no cap. Then add 0.9% on the part of your combined earnings above your filing-status threshold, if any. The calculator above runs exactly these steps and shows each line, so you can follow your own numbers down the table.
Why is only 92.35% of my income taxed?
Because employees never pay tax on the part their employer pays. When you work for someone else, your wages are taxed for Social Security and Medicare, but your employer’s matching 7.65% is paid on top and never counts as your wages. As your own employer, you would otherwise be taxed on both halves. The 92.35% factor – 100% minus 7.65% – removes the employer-equivalent share from your taxable base before the 15.3% is charged, putting you on roughly the same footing as an employee. On $100,000 of net earnings it takes $7,650 out of the base, which is worth about $1,170 of tax.
Can I deduct half of my self-employment tax?
Yes. You deduct one half of the Social Security and Medicare part of the tax as an adjustment to income – on Schedule 1, line 15 of Form 1040 – whether or not you itemize. It lowers your adjusted gross income, so it reduces your income tax, not the self-employment tax itself. On the default example the deduction is $7,064.78, worth about $1,554 of income tax at a 22% marginal rate. One fine point this calculator handles correctly: the additional 0.9% Medicare tax is not part of the Schedule SE tax, so it is not included in the deductible half.
I also have a W-2 job. Does that change my self-employment tax?
It can change it a lot. The $184,500 Social Security wage base is shared between your job and your self-employment: W-2 wages taxed for Social Security use it up first, and your self-employment income is only charged the 12.4% on whatever room is left. Say you earn $150,000 in W-2 wages and $100,000 self-employed: only $34,500 of wage base remains, so your Social Security tax is $4,278.00 instead of $11,451.40, and your total bill falls from $14,129.55 to $7,337.30. That is why this page asks about W-2 wages – a calculator that skips the question overstates your tax. Medicare has no cap, so the 2.9% is unaffected.
How and when do I pay self-employment tax?
Usually quarterly, with Form 1040-ES estimated tax payments – one combined payment that covers both your self-employment tax and your income tax, due in April, June, September and January. This page splits your self-employment tax into four equal payments so you can see the SE share of each one: $3,532.39 a quarter on the default example. Two more things worth knowing: if your net self-employment earnings are under $400, you generally owe no self-employment tax at all, and self-employment tax is separate from income tax – paying one does not cover the other.
Why is my effective rate below 15.3 percent?
Because of the 92.35 percent rule. At the default $100,000 of net earnings, the taxable base is $92,350.00, Social Security is $11,451.40 and Medicare is $2,678.15, giving a total of $14,129.55, which is 14.13 percent of the net earnings, not 15.3 percent. The 92.35 percent rule removes $7,650.00 from the base first, which is why the effective rate sits below the headline, and it falls further past the wage base, to 11.94 percent at $250,000 of net earnings for a single filer, because earnings past the base pay Medicare only.
Does a W-2 job reduce my self-employment tax?
It reduces the Social Security part, because the W-2 wages use the $184,500 wage base first. With $100,000 of net self-employment earnings and $100,000 of W-2 wages, Social Security is charged on only $84,500.00 of the $92,350.00 base, giving $10,478.00 instead of $11,451.40, and the total falls to $13,156.15. With $200,000 of W-2 wages, the base is used up entirely, Social Security on the self-employment earnings falls to $0.00, and the total is $3,509.30, Medicare plus additional Medicare tax only. The two jobs together have paid Social Security exactly once, on the wage base, as the system intends.
Why does filing status change only the additional Medicare line?
Because on this page, status sets only the threshold for the additional 0.9 percent Medicare tax: $200,000 for single filers, $250,000 for joint filers, $125,000 if filing separately. At $250,000 of net earnings, a single filer pays an additional $277.88, while a joint filer pays $0.00, because the $230,875.00 base is below the joint threshold, and the total falls from $29,851.26 to $29,573.38 with Social Security and Medicare unchanged. At $300,000, the joint additional line is $243.45 and the separate additional line is $1,368.45, on the same base, differing only by the threshold.
How much should I set aside each quarter?
The self-employment slice alone is the total divided by four: at the default, $14,129.55 divided by four is $3,532.39 per quarter. The cheque you actually write each quarter is bigger, because the estimated payment also carries your income tax, which this calculator does not compute. Keep the self-employment slice separate from the income tax slice in your own accounting, and neither will surprise you at filing time. This is general information, not tax advice, and the figures here are federal, for tax year 2026.
Do I owe self-employment tax if I also have a W-2 job?
Yes, on your self-employment earnings, but the Social Security wage base is shared. Wages on which Social Security tax was already withheld use up part of the $184,500 wage base for 2026, so less of your self-employment income is subject to the 12.4% Social Security portion. The 2.9% Medicare portion applies to all of it regardless.
What is the $400 threshold for self-employment tax?
If your net earnings from self-employment are $400 or more in the year, you owe self-employment tax and must file Schedule SE. Below $400, no SE tax is due — though income tax may still apply, and church-employee and certain other special rules differ.
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An estimate – not tax advice or a tax return.
Every figure on this page is the Schedule SE method applied to the amounts you enter, using 2026 rates: a $184,500 Social Security wage base (Social Security Administration), the 92.35% factor, 12.4% and 2.9% rates, and the Form 8959 additional Medicare thresholds. It covers the standard case for sole proprietors and single-member LLCs reporting on Schedule C or Schedule F. It does not cover the optional farm and nonfarm methods, ministers and church employees, household employees, partners with guaranteed payments, or any state tax, and self-employment tax can be owed in a year when no income tax is due. CalcFolk is not affiliated with the Internal Revenue Service or the Social Security Administration. If your situation involves any of these, work through the Schedule SE instructions or talk to a tax professional before you rely on a number.