Built on the 2025 Schedule SE, with the current 15.3% rate and the $176,100 Social Security wage base
Your self-employment tax, line by line
Schedule SE is where your net profit turns into Social Security and Medicare tax. Because you are both employer and employee, you pay the full 15.3 percent, but only on 92.35 percent of your earnings, and only up to the wage base for the Social Security half. Enter your net earnings and the generator applies the factor, splits the two parts, accounts for any W-2 wages, and shows the tax you owe and the half you can deduct. Preview the finished schedule, then print a Schedule SE ready to attach and file.
Preview before you payThe math done for youTax year 202524/7 support
Written and reviewed against the 2025 Schedule SE and its instructions by the ePaystubs editorial team · Updated · Sources
2025
Sch SESelf-Employment TaxTax Year 2025
Net SE earnings (line 3)$70,000.00
SE tax base (line 6)$64,645.00
Social Security 12.4% (line 10)$8,015.98
Medicare 2.9% (line 11)$1,874.71
Self-employment tax (line 12)$9,890.69
Half deductible (line 13)$4,945.34
Sample figures shown for illustration. Your schedule reflects the net earnings you enter.
How it works
Three steps from net profit to the tax you owe
No wrestling with the 92.35 percent factor, the wage base, or the W-2 offset by hand. Enter your net earnings and the generator lays out the completed Schedule SE, splits the Social Security and Medicare parts, and shows both the tax and the deductible half before you pay.
Bring your net profit from Schedule C, Schedule F, or a K-1, plus any W-2 Social Security wages you already earned this year, which count first toward the wage base.
Sch SE2025
Preview
2
Preview the completed Schedule SE
See the finished schedule with the 92.35 percent base, the Social Security part up to the wage base, the Medicare part with no cap, and the total on line 12, before you pay or print.
PDFSch SE
Print
With 1040
Download Schedule SE
3
Review, attach and file
Check the completed Schedule SE against your records, print it, and attach it to your Form 1040. The total carries to Schedule 2 and the deductible half to Schedule 1. File by mail, or use the figures to e-file.
Most schedules take a few minutes once your net profit is in hand. Sample entries shown; your form uses your real numbers.
Why this generator
Built so the parts that trip up a Schedule SE are the ones it handles
Self-employment tax goes wrong in a few familiar ways: forgetting the 92.35 percent factor, assuming Medicare has a cap, missing the W-2 wage offset, or overlooking the deductible half. Those are the parts this tool handles, with the 2025 numbers built in.
The 15.3 percent split, handled
The tool applies 12.4 percent for Social Security and 2.9 percent for Medicare to the right base, so the two halves of your self-employment tax come out correct.
The 92.35 percent base, applied for you
Only 92.35 percent of your net profit is taxed, the built-in offset for the employer share. The generator applies it automatically before figuring the rate.
The W-2 wage interaction
If you also draw a paycheck, those Social Security wages count first toward the wage base. The tool subtracts them so you are not taxed twice on the same cap.
The deductible half, carried across
Half of your self-employment tax is an above-the-line deduction. The tool computes it on line 13, ready to carry to Schedule 1, line 15, and lower your AGI.
Works from your other schedules
Net profit from Schedule C, Schedule F, or a partnership K-1 all feed Schedule SE. Combine multiple businesses, and a loss in one reduces the earnings of another.
Real support, around the clock
Not sure if you cross the $400 line, or how a W-2 job changes the math? Chat, call +1 857 444 9266, or email info@epaystubs.net any hour, any day.
Interactive guide
Every line of Schedule SE, explained
Schedule SE walks from your net earnings down to the tax and the deductible half. Tap or click a line to see what it does and the mistake to avoid.
Sch SE2025
Line 1aNet farm profit or loss
Line 1a carries your net farm profit or loss from Schedule F, line 34, plus your share of farm partnership earnings from a K-1. It is the farm side of your self-employment earnings before the tax is figured.
Watch forLine 1b lets certain farmers subtract Conservation Reserve Program payments if they receive Social Security retirement or disability benefits, so those payments are not double-taxed.
Line 2Net business profit or loss
Line 2 carries your net profit or loss from Schedule C, line 31, and your share of non-farm partnership earnings from a K-1. For most filers this is the main figure, straight from their business.
Watch forUse the net profit after expenses, not gross receipts. Every legitimate business expense you claim on Schedule C lowers this number, and with it your self-employment tax.
Line 3Combined net earnings
Line 3 combines your farm and non-farm earnings from lines 1a, 1b, and 2. If you run more than one business, they are netted here, so a loss in one offsets a profit in another.
Watch forThis is a combined figure across all your self-employment, but each spouse files a separate Schedule SE. Don't merge two people's earnings onto one form.
Line 4aThe 92.35 percent factor
Line 4a multiplies your positive net earnings by 92.35 percent. This built-in adjustment removes an employer-equivalent share of payroll tax, so you are taxed on 92.35 cents of every dollar of profit, not the full dollar.
Watch forIf the result on line 4c is under $400, you generally owe no self-employment tax. The $400 test is applied here, after the factor, not to your gross income.
Line 6Self-employment tax base
Line 6 is the base the tax is figured on, your 92.35 percent earnings plus any church employee income. Both the Social Security and Medicare parts are calculated from this figure.
Watch forThis line 6 base, not your raw profit, is what the 0.9 percent Additional Medicare Tax threshold of $200,000 or $250,000 is measured against on Form 8959.
Line 7Social Security wage base
Line 7 is the maximum amount of earnings subject to the 12.4 percent Social Security tax for the year. For 2025 that ceiling is $176,100. Earnings above it are not subject to the Social Security part.
Watch forThis is a preprinted figure that changes every year. The Medicare part has no equivalent ceiling, so it keeps applying above this amount.
Line 8aW-2 Social Security wages
Line 8a is the total Social Security wages and tips from your W-2 forms, box 3 plus box 7, along with any railroad retirement compensation. It matters because those wages use up part of the wage base first.
Watch forIf you had a job as well as a business, filling this in correctly keeps you from paying the 12.4 percent twice on the same capped earnings. Leaving it blank can overstate your tax.
Line 9Social Security base remaining
Line 9 subtracts your W-2 Social Security wages from the wage base, leaving the room still available for the 12.4 percent tax on your self-employment earnings. If it is zero, no Social Security part applies.
Watch forWhen your W-2 wages already reach the wage base, this line is zero and you skip straight to the Medicare-only calculation. The Medicare part still applies in full.
Line 10Social Security part, 12.4 percent
Line 10 applies the 12.4 percent Social Security rate to the smaller of your base or the remaining wage-base room. This is usually the larger of the two parts of your self-employment tax.
Watch forThe rate is 12.4 percent because you pay both the employee and employer halves, 6.2 percent each. That is why self-employment tax feels steep compared with a paycheck.
Line 11Medicare part, 2.9 percent
Line 11 applies the 2.9 percent Medicare rate to your entire line 6 base, with no cap. Every dollar of your 92.35 percent earnings is subject to it, however high your income.
Watch forA common error is assuming Medicare stops at the wage base like Social Security. It doesn't. High earners also add the separate 0.9 percent surtax on Form 8959.
Line 12Total self-employment tax
Line 12 adds the Social Security and Medicare parts into your total self-employment tax. This figure carries to Schedule 2, line 4, and then to Form 1040, line 23, as part of your other taxes.
Watch forThis tax is on top of your income tax, not instead of it. Because nothing was withheld during the year, it is the number that most often drives a balance due in April.
Line 13Deductible half
Line 13 is half of your self-employment tax, an above-the-line deduction that carries to Schedule 1, line 15. It lowers your adjusted gross income and your income tax, though not the self-employment tax itself.
Watch forYou get this deduction even with the standard deduction. Skipping it, or forgetting to carry it to Schedule 1, means paying more income tax than you owe.
The basics
What is Schedule SE?
Quick answer
Schedule SE (Form 1040), Self-Employment Tax, figures the Social Security and Medicare tax you owe on self-employment earnings. A W-2 employee splits those payroll taxes with an employer; a self-employed person pays both halves, a combined 15.3 percent. Schedule SE applies that rate to 92.35 percent of your net profit, and the total carries to Schedule 2, line 4, while half the tax deducts on Schedule 1, line 15.
When you work for an employer, they withhold 7.65 percent of your pay for Social Security and Medicare and quietly pay a matching 7.65 percent themselves. When you work for yourself, there is no one to pay the other half, so you cover both, which is why the self-employment rate is 15.3 percent. It is the same Social Security and Medicare system, just paid in one place.
The tax is figured on your net profit, the figure from Schedule C, Schedule F, or a partnership K-1, after your business expenses. Two features soften it. First, only 92.35 percent of that profit is taxed. Second, you deduct half of the resulting tax as an above-the-line adjustment, which lowers your income tax. Neither changes the fact that the full self-employment tax is still owed.
One more piece: the Social Security half has a ceiling and the Medicare half does not. For 2025, the 12.4 percent Social Security part applies only up to $176,100 of earnings, and any W-2 wages you earned count against that ceiling first. The 2.9 percent Medicare part applies to everything, with a small extra surtax for high earners handled on a separate form.
Why 92.35 percent
The factor is not arbitrary. A W-2 employee is never taxed on the employer's share of payroll tax, which is 7.65 percent of wages. Multiplying your net profit by 92.35 percent, which is 100 percent minus 7.65 percent, strips out an equivalent employer share before the 15.3 percent rate applies. Without it, a self-employed person would effectively be taxed on money an employee never sees taxed.
The rates
How the 15.3 percent breaks down
Self-employment tax is not one flat rate on your whole profit. Here are the pieces, the rate each carries, and what it applies to for 2025.
Piece
Rate
What it applies to
The 92.35% factor
—
Reduces net profit to the taxable base first
Social Security
12.4%
The base, up to $176,100 for 2025, less W-2 SS wages
Medicare
2.9%
The entire base, with no cap
Additional Medicare
0.9%
Base above $200k single, $250k joint, on Form 8959
Deductible half
50%
Of the 15.3% tax, carried to Schedule 1, line 15
Swipe the table sideways for the full text →
Put together, the arithmetic is short. Take your net profit, multiply by 92.35 percent to get the base, then apply 15.3 percent up to the wage base and 2.9 percent on anything above it. For $10,000 of net profit, the base is $9,235 and the tax is about $1,413. For $70,000, the base is $64,645 and the tax is roughly $9,891, before any W-2 wage offset.
The wage base is the moving part. Because it caps only the Social Security half, your marginal self-employment rate drops sharply once your earnings pass $176,100, from 15.3 percent down to the 2.9 percent Medicare part alone. And if you also hold a job, your W-2 Social Security wages fill that cap first, so the 12.4 percent may apply to only part of your self-employment earnings, or none.
Quick rule
Self-employment tax is 15.3 percent of 92.35 percent of your net profit, with the Social Security half capping at $176,100 for 2025 and the Medicare half running with no cap. Business expenses lower the base; income tax deductions do not. Half the tax comes back as an adjustment on Schedule 1.
Try it
Estimate your self-employment tax
Enter your net self-employment earnings and any W-2 Social Security wages you already earned this year. The tool applies the 92.35 percent factor, the 2025 wage base, and the two rates, then shows your tax and the deductible half.
Net earnings are your profit after business expenses, from Schedule C, Schedule F, or a K-1. W-2 Social Security wages come from box 3 of any W-2; they count first toward the $176,100 wage base, so leave this at zero if you have no job. This estimate uses the 2025 wage base and doesn't include the 0.9 percent Additional Medicare Tax or the optional methods. It isn't tax advice.
Your self-employment tax, roughly
SE tax base (line 6)$64,645.00
Social Security, 12.4% (line 10)$8,015.98
Medicare, 2.9% (line 11)$1,874.71
Self-employment tax (line 12)$9,890.69
Deductible half (line 13)$4,945.34
An estimate to plan with, not tax advice or a filed return. It uses the 2025 wage base and standard rates, and doesn't include the 0.9 percent surtax or optional methods. The generator builds the full Schedule SE, and the Form 1040 generator puts it in context.
Schedule SE feeds your return in two directions at once. Follow both in four moves and the whole picture fits together.
1
Figure the tax on Schedule SE
Your net earnings become the 92.35 percent base, the two rates apply, and the total self-employment tax lands on line 12, with half of it computed on line 13.
Schedule SE, lines 12 and 13
2
Carry the total to Schedule 2
The full self-employment tax from line 12 goes to Schedule 2, line 4, the schedule for other taxes that don't sit on the face of the 1040.
Schedule 2, line 4
3
It lands on your 1040
From Schedule 2, the tax flows to Form 1040, line 23, and joins your income tax in the total you owe. It is on top of income tax, not instead of it.
Form 1040, line 23
4
Deduct half on Schedule 1
Separately, half the tax from line 13 carries to Schedule 1, line 15, as an above-the-line adjustment that lowers your AGI and your income tax.
Schedule 1, line 15
The two directions
The same schedule both adds and subtracts. The full self-employment tax raises what you owe, flowing through Schedule 2 to your 1040. Half of it comes back as a deduction on Schedule 1, trimming your income tax. The deduction softens the blow, but the whole self-employment tax is still due.
Dates and penalties
2025 deadlines and quarterly tax
Schedule SE files with your 1040, so it shares the same calendar. But because self-employment income has no withholding, the dates that usually matter most are the quarterly ones.
The dates that matter
The 2025 return was due April 15, 2026, and an extension on Form 4868 moves the filing deadline to October 15, 2026. That extension is to file, not to pay, so any tax owed for 2025, self-employment tax included, was still due in April. If you extended, October 15 is the date that still matters for you now.
The bigger issue for the self-employed is estimated tax. No employer withholds anything from your business income, so the IRS expects you to pay as you go. If you expect to owe $1,000 or more when you file, you generally make quarterly payments using Form 1040-ES, due around April 15, June 15, September 15, and the following January 15. Those payments need to cover both your self-employment tax and your income tax.
It is easy to underestimate, because self-employment tax alone runs to 15.3 percent before any income tax. A common rule of thumb is to set aside 25 to 30 percent of net profit for federal tax, more in a state with income tax. Falling short during the year can bring an underpayment penalty, even if you pay the full balance in April.
If you're late
When you owe and file late, the failure-to-file penalty is usually 5 percent of the unpaid tax for each month or part of a month, up to 25 percent, with a separate failure-to-pay penalty of 0.5 percent per month alongside it, plus interest. Underpaying quarterly estimates carries its own penalty, figured on Form 2210. When you're owed a refund there's no late-filing penalty, but you generally have three years from the original due date to claim it.
For tax year 2025
New for 2025
A couple of numbers moved, and one widely misunderstood point is worth stating plainly: the new deductions do not touch self-employment tax.
Higher wage base
The Social Security cap rose to $176,100. For 2025 the 12.4 percent Social Security part applies to earnings up to $176,100, up from $168,600 in 2024. More of a higher earner's profit falls under the Social Security tax before the Medicare-only band begins.
Tips and overtime
The new deductions don't cut SE tax. The 2025 write-offs for tips and overtime are income tax deductions on Schedule 1-A. A self-employed worker with tip income still owes the full 15.3 percent self-employment tax on those tips, even while deducting them for income tax.
Additional Medicare
The 0.9 percent surtax threshold holds. The extra 0.9 percent Medicare tax still applies to earnings above $200,000 for single filers and $250,000 for joint filers. It is figured on Form 8959, not on Schedule SE, and the deductible half does not apply to it.
Looking ahead
The base rises again for 2026. The Social Security wage base is set to climb to $184,500 for 2026. It matters for planning, but your 2025 Schedule SE uses the $176,100 figure, so keep the two years straight when you estimate.
The point to remember: self-employment tax is figured on your net profit before any income tax deductions. The 20 percent QBI deduction, retirement contributions, the standard deduction, and the new tips and overtime write-offs all lower income tax, but none of them lower the self-employment tax on this schedule.
Lower your SE tax
What reduces self-employment tax, and what doesn't
This is the most common source of confusion. Many deductions cut your income tax without touching your self-employment tax. Here is what actually moves each one.
Move
Cuts SE tax?
Why
Business expenses
Yes
Lower your net profit, the base the tax is figured on
The 92.35% factor
Yes, built in
Taxes 92.35 cents of each dollar, not the full dollar
S corporation election
Yes, in part
Profit taken as distributions avoids SE tax; salary doesn't
Half-SE deduction
No
Lowers income tax on Schedule 1, not the SE tax itself
QBI (20%) deduction
No
An income tax deduction, applied after SE tax is set
Retirement contributions
No
SEP, SIMPLE and solo 401(k) cut income tax only
Standard or itemized deduction
No
Applied to taxable income, well after SE tax
Tips and overtime deductions
No
Income tax only; tips still owe the full 15.3%
Swipe the table sideways for the full text →
The pattern is clear once you see it: self-employment tax is figured early, on net profit, so only things that change net profit change the tax. That means business expenses are your main lever. Every legitimate deduction on Schedule C or Schedule F, from mileage to equipment to a home office, lowers the base and saves about 14.1 cents of self-employment tax per dollar, on top of income tax savings.
The bigger structural move is an S corporation election. An owner pays themselves a reasonable salary, which is subject to payroll tax, and takes remaining profit as distributions that are not subject to self-employment tax. It can save real money, but it adds payroll filings, a separate return, and compliance cost, so it generally only pays off above roughly $80,000 to $100,000 of steady profit, and the salary must be truly reasonable for the work.
Quick rule
If a deduction lowers your net business profit, it lowers your self-employment tax. If it only lowers your taxable income later on the 1040, it doesn't. Track every business expense, and treat the QBI deduction, retirement contributions and the standard deduction as income tax savings, not SE tax savings.
Avoid these
The mistakes that cost Schedule SE filers
Most self-employment tax errors, whether a surprise balance due or an overpayment, come from the same short list. Clear these and your schedule is both correct and cheaper.
Taxing 100 percent of profit
Forgetting the 92.35 percent factor and applying 15.3 percent to your full net profit overstates the tax. Only 92.35 cents of every dollar of profit is subject to it.
Assuming Medicare has a cap
The Social Security part stops at the wage base, but the 2.9 percent Medicare part does not. Every dollar of your base is subject to it, and high earners add a 0.9 percent surtax on top.
Skipping the W-2 wage offset
If you also hold a job, your W-2 Social Security wages count first against the wage base. Leaving line 8a blank can make you pay the 12.4 percent twice on the same capped earnings.
Thinking deductions cut SE tax
The QBI deduction, retirement contributions and the new tips and overtime write-offs all lower income tax, not self-employment tax. SE tax is figured earlier, on net profit.
Forgetting the deductible half
Half your self-employment tax is an above-the-line adjustment, but it only helps if you carry line 13 to Schedule 1, line 15. Miss it and you pay more income tax than you owe.
Not paying quarterly
No one withholds tax from self-employment income, so waiting until April can bring an underpayment penalty on top of the bill. If you'll owe $1,000 or more, pay estimated tax through the year.
One more
If you're married and you both have self-employment income, you each file your own Schedule SE under your own Social Security number. Self-employment earnings are never combined onto one spouse's form, and each of you is tested against the $400 threshold and the wage base separately.
Filing it
How to file your Schedule SE
Schedule SE is never filed on its own. It attaches to your Form 1040, so filing the schedule means filing the whole return. Here are the routes, including the free ones, and where this tool fits.
1
Attach it to your 1040
File Schedule SE with your Form 1040, along with the schedule that produced your net earnings, Schedule C or Schedule F, plus Schedule 2 for the tax and Schedule 1 for the deductible half. The complete return goes to the IRS as one package.
Part of the return
2
Free and low-cost e-file
IRS Free File offers guided software free if your income is 89,000 dollars or less, and Free File Fillable Forms are open to any income. Nearly all commercial software includes Schedule SE and moves the totals to Schedule 2 and Schedule 1 automatically.
e-File options
3
Software or a preparer
A W-2 job alongside a business, multiple ventures, or an S corporation question can complicate the wage-base math quickly. Commercial software or a preparer can keep the pieces straight and help you weigh whether restructuring is worth it.
When it's worth it
Where this tool fits
This generator helps you fill out and produce a completed Schedule SE that you can review, attach to your Form 1040, and file, or use to estimate what you'll owe before you enter it elsewhere. It does not transmit anything to the IRS, it isn't a substitute for tax software or a preparer, and it isn't tax advice. You're responsible for the accuracy of your figures and for keeping the records behind them.
Keep the records behind your Schedule SE, the Schedule C or Schedule F that produced your net profit, your 1099-NEC and 1099-K forms, and any W-2 if you also held a job, since box 3 feeds the wage-base offset. Remember the two carries: the full tax to Schedule 2, line 4, and half of it to Schedule 1, line 15. One filing option is gone: IRS Direct File, the government-run pilot from 2024 and 2025, is not available for the 2026 filing season. E-filing generally gets any refund out faster than mailing.
Need the forms around your Schedule SE?
Schedule SE starts from your business net profit and feeds your 1040. Whatever your return needs, from Schedule C to the full 1040, it's a click away, all with the same preview-first approach.
The questions filers ask most about the rate, the wage base, the deductible half, and what actually lowers the tax.
Schedule SE (Form 1040), Self-Employment Tax, is the form that figures the Social Security and Medicare tax owed on self-employment earnings. Employees split those taxes with an employer, but a self-employed person pays both halves, a combined 15.3 percent. Schedule SE applies that rate to 92.35 percent of your net earnings, and the total carries to Schedule 2, line 4, while half the tax deducts on Schedule 1, line 15.
You must file Schedule SE if your net earnings from self-employment were $400 or more for the year, or if you had church employee income of $108.28 or more. The $400 test applies to net profit, not gross receipts, so it is your income after business expenses. This applies to sole proprietors, independent contractors, gig workers, freelancers, farmers, and active partners, regardless of age or whether you already collect Social Security.
The self-employment tax rate is 15.3 percent, made up of 12.4 percent for Social Security and 2.9 percent for Medicare. It applies to 92.35 percent of your net self-employment earnings, not the full amount. So $10,000 of net profit is taxed on a base of $9,235, giving roughly $1,413 of self-employment tax before any wage-base cap or W-2 wage offset.
The 92.35 percent factor exists to mirror how employees are treated. An employer pays half of an employee's payroll tax, 7.65 percent, and the employee is not taxed on that employer share. Multiplying your net profit by 92.35 percent removes an equivalent employer-share slice before the 15.3 percent rate applies, so you are not taxed on money a W-2 worker would never see taxed.
Only on the Social Security part. The 12.4 percent Social Security portion applies to your earnings up to the annual wage base, which is $176,100 for 2025. Earnings above that are not subject to the 12.4 percent. The 2.9 percent Medicare portion has no cap and applies to every dollar of your 92.35 percent base, and a 0.9 percent Additional Medicare Tax can apply on top at higher incomes.
Your W-2 Social Security wages count first toward the $176,100 wage base. Schedule SE subtracts them, so the 12.4 percent Social Security rate applies only to the remaining room, if any. If your W-2 Social Security wages already reach or exceed $176,100, no Social Security part applies to your self-employment income. The 2.9 percent Medicare part still applies to all of your self-employment base.
You can deduct half of it. Schedule SE line 13 computes 50 percent of your self-employment tax, and that amount carries to Schedule 1, line 15, as an above-the-line adjustment that lowers your adjusted gross income. It reduces your income tax, not the self-employment tax itself, mirroring the deduction an employer gets for its share of payroll tax. You keep it even with the standard deduction.
No. The 2025 deductions for tips and overtime are income tax deductions claimed on Schedule 1-A. They do not reduce self-employment tax at all. A self-employed worker with tip income still owes the full 15.3 percent self-employment tax on those tips, even if the same tips are deducted for income tax. Self-employment tax is figured on your net profit before any of those income tax deductions.
No. The 20 percent qualified business income deduction and contributions to a SEP, SIMPLE or solo 401(k) all reduce your income tax, but none of them reduce self-employment tax. Self-employment tax is figured earlier, on your net business profit, before those income tax deductions are applied. Only business expenses that lower your net profit, and the built-in 92.35 percent factor, reduce the self-employment tax base.
Two things. First, legitimate business expenses on Schedule C or Schedule F lower your net profit, which is the base the tax is figured on. Second, the 92.35 percent factor is built into the form. Beyond that, some higher earners elect S corporation status and pay themselves a reasonable salary, so that profit taken as distributions is not subject to self-employment tax, though that adds payroll and compliance costs and only tends to pay off above a certain profit level.
Yes, if your net self-employment earnings are $400 or more, you owe self-employment tax on them regardless of your day job. Your W-2 wages affect only the Social Security part, because they count first toward the wage base. The Medicare part applies to your full self-employment base either way. A side business, freelance work, or gig income all trigger Schedule SE once net earnings reach $400.
It is an extra 0.9 percent tax on earned income above $200,000 for single filers, $250,000 for married filing jointly, or $125,000 for married filing separately. For self-employment income, it applies when your 92.35 percent base passes the threshold, and it is figured separately on Form 8959, not on Schedule SE. The deductible half of self-employment tax does not apply to this 0.9 percent surtax.
Your total self-employment tax from Schedule SE, line 12, carries to Schedule 2, line 4, which flows to Form 1040, line 23, as part of other taxes. Separately, half of the tax from Schedule SE, line 13, carries to Schedule 1, line 15, as an adjustment that lowers your adjusted gross income. So the same schedule both adds a tax and provides a partial deduction.
Usually. Self-employment income has no withholding, so if you expect to owe $1,000 or more when you file, the IRS generally wants quarterly estimated payments using Form 1040-ES, due in April, June, September and January. Those payments should cover both your self-employment tax and your income tax. Missing them can bring an underpayment penalty even if you pay in full at filing.
No. The generator helps you fill out and produce a completed Schedule SE that you can review, attach to your Form 1040, and file, or use to estimate what you will owe. It does not transmit anything to the IRS, it is not a substitute for tax software or a preparer, and it is not tax advice. You are responsible for the accuracy of your figures and for keeping the records behind them.
Sources
Where these rules come from
Every rate, threshold, and line on this page traces back to primary government guidance. Verify any of it at the source.
This page is educational and doesn't provide legal, tax, or financial advice, and isn't affiliated with the IRS. A Schedule SE should reflect your true net earnings from self-employment for the year. Rates, thresholds, and the wage base change, so confirm current figures against the IRS sources above or a qualified tax professional. The estimator is a rough planning figure using the 2025 wage base and standard rates, and doesn't include the 0.9 percent surtax or optional methods.
Support
Not sure if you owe, or how a W-2 job changes it? A person answers, day or night
Whether you cross the $400 line, how the wage base works with a paycheck, and what actually lowers the tax all trip people up, so you can reach a person any hour.
Live chat, 24/7
Fastest for a quick question mid-schedule. Start a chat from any page and keep filling out the form while you wait.
Call us
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Email
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Figure your self-employment tax the clear way
Enter your net earnings, let the tool apply the 92.35 percent factor, split the Social Security and Medicare parts, and account for any W-2 wages, then download a Schedule SE ready to review, attach to your 1040, and file.
