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Schedule SE: Self-Employment Tax Calculation Guide

Tax information is for educational purposes only and does not constitute tax advice. Consult a licensed tax professional for your specific situation.

Schedule SE is the IRS form used to calculate self-employment (SE) tax, which covers Social Security and Medicare contributions for people who work for themselves. If you are a freelancer, independent contractor, gig worker, or sole proprietor with net self-employment earnings of $400 or more, you must file Schedule SE alongside your Form 1040. For a broader overview of self-employment taxes including quarterly estimated payments and planning strategies, see our self-employment tax guide.

This guide explains exactly how Schedule SE works, line by line.

Where to Get Schedule SE

Download Schedule SE and its instructions at irs.gov/forms-pubs/about-schedule-se-form-1040. Tax preparation software calculates Schedule SE automatically when you have self-employment income.

Who Must File Schedule SE?

You must file Schedule SE if:

Your net self-employment earnings are $400 or more
You received a Form 1099-NEC and reported income on Schedule C
You are a general partner in a partnership with self-employment income
You earned income from a trade or business as a sole proprietor

You do NOT file Schedule SE if:

You are an S corporation shareholder (you pay yourself a W-2 salary instead)
You are a limited partner (limited partners generally do not owe SE tax on partnership income)
Your only income is from wages, salaries, or tips (those are already covered by FICA withholding)

Understanding the 15.3% Rate

Self-employment tax is the self-employed equivalent of FICA taxes that employees and employers split. As a self-employed person, you pay both halves.

Component	Employee Rate	Employer Rate	Combined SE Rate
Social Security	6.2%	6.2%	12.4%
Medicare	1.45%	1.45%	2.9%
Total	7.65%	7.65%	15.3%

Social Security wage base (2026): The 12.4% Social Security portion applies only to the first ~$174,900 of combined wages and self-employment income. Once you hit that ceiling, you stop paying the Social Security portion (but Medicare has no cap).

Additional Medicare Tax: If your self-employment income combined with other earned income exceeds ~$200,000 (single) or ~$250,000 (MFJ), you owe an additional 0.9% Medicare surtax on the amount over the threshold. This is reported on Form 8959, not Schedule SE, but it is directly related.

Schedule SE: Line-by-Line Walkthrough

Part I: Self-Employment Tax (Short Schedule SE)

Most self-employed individuals use the short version of Schedule SE. The long version (Part II) is only needed in specific situations like church employee income or prior-year SE tax methods.

Line 1a: Net Farm Profit or Loss

From Schedule F (farming income). Enter zero if you are not a farmer.

Only applies if you also receive tips reported on Form W-2 — rare for most Schedule SE filers.

Line 2: Net Profit from Schedule C

This is the key line for most filers. Enter the net profit (or loss) from your Schedule C, Line 31. If you have multiple Schedule C businesses, combine the net profit/loss from all of them.

Also include net self-employment income from partnerships (Schedule K-1, Box 14, Code A).

Line 3: Combine Lines 1a, 1b, and 2

Your total net self-employment income. If this is less than $400, stop here — you do not owe SE tax and do not need to file Schedule SE.

Line 4a: The 92.35% Factor

Multiply Line 3 by 92.35% (0.9235).

Why 92.35%? This adjustment simulates the employer-equivalent portion of FICA. When you work for an employer, the employer’s share of FICA is not included in your taxable wages. The 92.35% multiplier gives self-employed individuals a comparable treatment — you are effectively paying SE tax on the “employee” portion only.

Example: If your net SE income is $100,000: $100,000 x 0.9235 = $92,350 (this is your SE tax base)

Line 4b: Wage Base Adjustment

If you also received W-2 wages subject to Social Security tax, the Social Security portion of SE tax only applies to the amount needed to reach the ~$174,900 wage base.

Example: If you earned $140,000 in W-2 wages and $60,000 in SE income:

Social Security already covered on: $140,000 of wages
Remaining wage base room: ~$174,900 - $140,000 = ~$34,900
Only ~$34,900 of your SE income is subject to the 12.4% Social Security tax
All of your SE income is still subject to the 2.9% Medicare tax

Line 5: Self-Employment Tax Before Deduction

For most filers without W-2 wages:

If Line 4a is ~$174,900 or less: Line 4a x 15.3% = SE tax
If Line 4a exceeds ~~$174,900: (~~$174,900 x 12.4%) + (Line 4a x 2.9%) = SE tax

Line 6: Deductible Part of Self-Employment Tax

Multiply Line 5 by 50%. This is the employer-equivalent portion that you deduct as an above-the-line adjustment on Schedule 1, Line 15, which reduces your AGI.

This is a critical benefit: The deduction reduces your adjusted gross income, which affects eligibility for other deductions and credits. You do NOT need to itemize to claim it.

Full Calculation Example

Sarah is a freelance graphic designer. She has no W-2 wages. Her Schedule C net profit is $85,000.

Step	Calculation	Amount
Net SE income	Schedule C, Line 31	$85,000
Apply 92.35% factor	$85,000 x 0.9235	$78,497.50
Social Security tax	$78,497.50 x 12.4%	$9,733.69
Medicare tax	$78,497.50 x 2.9%	$2,276.42
Total SE tax	$9,733.69 + $2,276.42	$12,010.11
Deductible half	$12,010.11 x 50%	$6,005.06

Sarah owes $12,010.11 in self-employment tax. She deducts $6,005.06 on her Form 1040 to reduce her AGI. Her effective SE tax rate on $85,000 of income is approximately 14.1%.

How Schedule SE Connects to Form 1040

Schedule SE feeds into two places on your tax return:

Schedule 2, Line 4 — The total self-employment tax (Line 5 of Schedule SE) flows here and adds to your total tax liability on Form 1040
Schedule 1, Line 15 — The deductible half (Line 6 of Schedule SE) is subtracted as an above-the-line adjustment to reduce your AGI

This means SE tax affects your return in two ways: it increases your tax owed AND decreases your AGI (which can help with other deductions and credits).

Estimated Tax Payments

Because no employer withholds taxes from your self-employment income, you are generally required to make quarterly estimated tax payments using Form 1040-ES if you expect to owe $1,000 or more in combined income and SE tax.

2026 estimated tax due dates:

Q1: April 15, 2026
Q2: June 16, 2026
Q3: September 15, 2026
Q4: January 15, 2027

Underpayment penalties apply if you do not pay at least 90% of current-year tax or 100% of prior-year tax (110% if prior-year AGI exceeded ~$150,000) through withholding and estimated payments. You can manage payments through your IRS online account.

Check our tax filing deadlines guide for all key dates.

Common Mistakes to Avoid

Forgetting to file Schedule SE — If your Schedule C shows a net profit of $400 or more, you owe SE tax. This is in addition to income tax.
Not accounting for the W-2 wage base — If you have both W-2 wages and SE income, you may not owe the Social Security portion on all of your SE income.
Missing the deductible half — Many DIY filers forget to claim the above-the-line deduction for half of SE tax. This deduction reduces your AGI and saves money on income tax.
Ignoring the Additional Medicare Tax — If your combined earned income exceeds ~$200,000 (single) or ~$250,000 (MFJ), you owe an extra 0.9% on the excess. This is calculated on Form 8959.
Not making estimated payments — SE tax can be a shock at filing time. Quarterly payments spread the burden and avoid penalties.

E-Filing Schedule SE

Tax software calculates Schedule SE automatically based on your Schedule C net profit and any W-2 wages. It will:

Apply the 92.35% factor
Account for the Social Security wage base
Calculate the deductible half
Flow the amounts to the correct lines on Form 1040
Flag whether you need Form 8959 for Additional Medicare Tax

Frequently Asked Questions

Is self-employment tax the same as income tax?

No. Self-employment tax is separate from income tax. SE tax covers Social Security and Medicare contributions. You owe both SE tax and income tax on your self-employment earnings, though the deductible half of SE tax reduces your income tax.

Can I reduce my SE tax?

The most direct way is to reduce your net self-employment income through legitimate business deductions on Schedule C. Retirement plan contributions (SEP-IRA, Solo 401(k)) reduce income tax but do not reduce SE tax because SE tax is calculated before the retirement deduction.

What if I have both W-2 wages and self-employment income?

You pay FICA on your W-2 wages and SE tax on your self-employment income, but the Social Security wage base (~$174,900 for 2026) is a combined limit. If your W-2 wages already exceed the wage base, you only owe the 2.9% Medicare portion of SE tax.

Do S corporation owners pay self-employment tax?

S corporation shareholders do not pay SE tax on distributions. However, they must pay themselves a “reasonable” W-2 salary, which is subject to FICA taxes. The IRS scrutinizes S corps where the owner takes minimal salary and large distributions to avoid payroll taxes.

Does rental income trigger self-employment tax?

Generally no. Rental income reported on Schedule E is not subject to self-employment tax. However, if you provide substantial services to tenants (making the activity a business rather than a rental), the income may be reclassified and subject to SE tax.

Tax information is for educational purposes only and does not constitute tax advice. Consult a licensed tax professional or visit irs.gov for official guidance on your specific tax situation.