Schedule SE: Self-Employment Tax Form Line by Line

Schedule SE is the form self-employed people use to calculate self-employment tax, the 15.3% Social Security and Medicare tax on net earnings from your business. You take your net profit from Schedule C (or a partnership K-1), multiply it by 92.35%, apply 12.4% up to the Social Security wage base and 2.9% on everything, and carry the result to your Form 1040. Half of that tax then comes back to you as a deduction.

Our existing guide to self-employment tax covers the rate and the big picture. This post goes one level deeper and walks through the form itself, line by line, using the 2025 form filed in 2026 and the figures for 2026 and 2027 planning. It is general information, not tax advice; a tax professional can confirm how it applies to you.

Who must file Schedule SE

According to the IRS Schedule SE instructions, you file if:

• Your net earnings from self-employment (line 4c) are $400 or more, or
• You had church employee income of $108.28 or more.

Married couples filing jointly do not combine businesses on one Schedule SE; each spouse with self-employment income files their own. Spouses who run a business together can elect a qualified joint venture, each filing a separate Schedule C and Schedule SE, which also gives both spouses Social Security credit.

Schedule SE line by line

Line	What it is	Where the number comes from
1a	Net farm profit or loss	Schedule F, or farm partnership K-1
1b	Conservation Reserve Program payments	Only if receiving Social Security benefits
2	Net nonfarm profit or loss	Schedule C line 31, partnership K-1 box 14 code A
3	Combine lines 1a, 1b and 2	Total self-employment profit
4a	Line 3 x 92.35%	If line 3 is a loss, enter it as is
4b	Optional methods	Part II, if you use them
4c	Net earnings from self-employment	Stop here if under $400 (unless church income)
5a / 5b	Church employee income, x 92.35%	Form W-2 from an electing church
6	Add lines 4c and 5b	Base for Medicare part and Additional Medicare Tax test
7	Social Security wage base	Printed on the form for the tax year
8a	Social Security wages and tips from W-2s	W-2 boxes 3 and 7
8b	Unreported tips	Form 4137
8c	Wages subject to Social Security on Form 8919	Misclassified workers
8d	Add lines 8a to 8c
9	Line 7 minus line 8d	Remaining room under the wage base
10	Smaller of line 6 or 9, x 12.4%	Social Security portion
11	Line 6 x 2.9%	Medicare portion, no cap
12	Self-employment tax (10 + 11)	To Schedule 2 (Form 1040)
13	Deduction for half of SE tax (line 12 x 50%)	To Schedule 1 (Form 1040)

The Social Security wage base: 2025, 2026 and 2027

Tax year	Wage base (line 7)	Maximum 12.4% portion
2025	$176,100	$21,836.40
2026	$184,500	$22,878.00
2027	$192,300 (announced October 14, 2026)	$23,845.20

The 2027 figure comes from the Social Security Administration's annual announcement, reported by the Journal of Accountancy. Above the wage base you still pay the 2.9% Medicare tax, and if line 6 plus your wages exceeds $200,000 single, $250,000 married filing jointly or $125,000 married filing separately, a further 0.9% Additional Medicare Tax applies through Form 8959.

Worked example: a freelancer with $90,000 profit

Illustrative figures for tax year 2026. A designer's Schedule C shows gross receipts of $118,000 and expenses of $28,000, so net profit is $90,000.

1. Line 2: $90,000. Line 3: $90,000.
2. Line 4a: $90,000 x 0.9235 = $83,115. Line 4c and line 6: $83,115.
3. Line 7: $184,500. No W-2 wages, so line 9 is $184,500.
4. Line 10: $83,115 x 12.4% = $10,306.26.
5. Line 11: $83,115 x 2.9% = $2,410.34.
6. Line 12: self-employment tax of $12,716.60, carried to Schedule 2.
7. Line 13: deduction of $6,358.30 on Schedule 1, which lowers adjusted gross income.

Same freelancer with a $150,000 W-2 job

Now assume she also earned $150,000 in Social Security wages from an employer. Line 8a is $150,000, so line 9 is $34,500 ($184,500 minus $150,000). Line 10 becomes $34,500 x 12.4% = $4,278. Line 11 is unchanged at $2,410.34. Total self-employment tax falls to $6,688.34 because the employer's withholding already covered most of the wage base.

Optional methods (Part II)

The farm and nonfarm optional methods let people with low or negative earnings report more net earnings, which can secure Social Security credits or increase credits like the earned income credit. For 2025, the nonfarm method requires net nonfarm profits under $7,840 and less than 72.189% of gross nonfarm income, and that you were regularly self-employed (net earnings of $400 or more in two of the prior three years). It can be used for only five years in total. Combined optional earnings cannot exceed $7,240 for 2025. The optional methods increase self-employment tax, so use them only when the benefit is clear.

How Schedule SE connects to the rest of your return

• Schedule C drives everything. Every legitimate expense you claim on Schedule C lowers line 2 and cuts self-employment tax by about 14.1 cents per dollar on top of income tax savings.
• Home office and depreciation count. Deductions from Form 8829 and Form 4562 reduce net profit before Schedule SE.
• Health insurance and retirement do not. The self-employed health insurance deduction and SEP-IRA contributions reduce income tax only.
• Estimated taxes include SE tax. Your quarterly estimated payments must cover self-employment tax as well as income tax, or you may owe an estimated tax penalty.

Records that support your Schedule SE

Schedule SE has no attachments of its own, but every number on it traces back to Schedule C, so the records that support your profit support your self-employment tax. Keep a numbered invoice for every sale, bank statements that show the deposits, receipts for each expense, and your mileage log if you deduct vehicle costs. If the IRS questions your income, it typically compares deposits with reported gross receipts; invoices that match deposits one for one make that review short. Also keep copies of any Forms 1099-NEC and 1099-K you received and a note reconciling them with your gross receipts, since platform forms can include sales tax, refunds or amounts that belong to another year.

Common Schedule SE mistakes

• Applying 15.3% to full profit. Skipping the 92.35% step overstates tax by about 7.65%.
• Forgetting W-2 wages on line 8a. High earners with a day job can overpay hundreds or thousands of dollars.
• Combining spouses. Each spouse needs a separate Schedule SE.
• Missing the line 13 deduction. Software handles it, but hand-prepared returns sometimes omit it.
• Assuming S corp distributions are exempt automatically. They are not subject to SE tax, but the IRS expects a reasonable salary first.
• Treating 1099 thresholds as filing thresholds. The $2,000 Form 1099-NEC threshold for 2026 payments is what clients report; the $400 SE threshold applies to you regardless of whether you got a form. See the 1099-NEC threshold post.

Schedule SE for partners, LLC members and S corporation owners

Not every business owner starts from Schedule C. How you reach Schedule SE depends on your entity:

Entity	Source of self-employment income	Files Schedule SE?
Sole proprietor or single-member LLC	Schedule C net profit	Yes
General partner or active LLC member (partnership)	Schedule K-1 (Form 1065), box 14, which includes guaranteed payments	Yes
Limited partner	Generally only guaranteed payments for services	Sometimes
S corporation shareholder-employee	W-2 salary (payroll taxes withheld); distributions are not SE income	No, for the S corp income
Statutory employee	W-2 with box 13 checked; Schedule C, but no SE tax on that income	No, for that income

The S corporation row is why many profitable freelancers consider electing S status: only the salary is subject to payroll tax. The catch is that the salary must be reasonable for the work done, and the S corporation adds payroll, a separate return and state costs. Our guides to S corp reasonable salary and Form 2553 cover the trade-offs.

Estimating self-employment tax during the year

Because no employer withholds for you, Schedule SE is effectively a year-end true-up of the tax you should have paid in quarterly estimates. A practical method is to set aside a fixed share of every client payment as it arrives. Using the example above, $12,716.60 of SE tax on $90,000 of profit is about 14.1% of profit, before any income tax. Many freelancers keep 25% to 30% of each payment in a separate savings account to cover both, then adjust once they see their actual bracket. Paying on time each quarter, rather than in April, is what keeps the underpayment penalty away.

Your income tax bracket for 2026 also interacts with the line 13 deduction, which lowers adjusted gross income. If you expect income to jump in 2027, remember the wage base rises to $192,300, so the Social Security portion can grow even when rates stay the same.

What if your business had a loss?

If line 3 is a loss, you owe no self-employment tax for that business, and you skip most of the form. A loss from one business can offset profit from another on line 3, but it cannot offset W-2 wages for SE tax purposes. If you have a low or loss year and want to keep earning Social Security credits, review the optional methods with a professional.

Accurate gross receipts on Schedule C start with complete, numbered invoices that match your bank deposits. Create them with our free invoice generator, with no sign-up, and download each invoice as a PDF so your income records are ready when you fill in Schedule SE.