This guide follows the final 2025 IRS form and instructions. It covers the calculation, the line groups, the optional methods, and the situations that call for a professional. All dollar figures are US dollars, as the IRS reports them.
Key Takeaways
- Schedule SE calculates Social Security and Medicare tax once net self-employment earnings reach $400.
- Start from net profit, apply the 92.35% adjustment, then factor in any W-2 wages.
- Self-employment tax goes to Schedule 2; the deductible half goes to Schedule 1.
- Check every rate, threshold and line number against the official IRS 2025 documents.
What Is Schedule SE and Who Must File It?
Self-employment tax is the Social Security and Medicare tax that self-employed people pay in place of the employer and employee withholding. It is separate from income tax, and most self-employed people owe both. The earnings you report also feed your Social Security record, which affects future benefits.
Who files
You generally file if you are:
- A sole proprietor or independent contractor
- A freelancer or gig worker, including part-time
- A partner in a trade or business
- Otherwise in business for yourself
The test is $400 or more on Schedule SE line 4c. It is an earnings test, not a gross-receipts or Form 1099 threshold. A separate trigger applies to qualifying church employees with $108.28 or more of church employee income. Ministers follow different rules.
Age does not matter. Self-employment tax applies even if you already receive Social Security or Medicare.
Gross receipts, Form 1099 and net earnings
These three numbers are not interchangeable:
- Schedule C line 1 reports gross receipts, including amounts shown on Forms 1099-NEC.
- Schedule C line 31 gives net profit or loss after expenses.
- Schedule SE works from net profit.
A Form 1099-K shows gross payments before fees, refunds and discounts, so match it to your own records. Income can also be reportable with no information form at all.
How the forms connect
Business profit goes to Schedule 1 line 3 and also into Schedule SE line 2. The tax from Schedule SE goes to Schedule 2, and the deductible half goes to Schedule 1. Each ends up on a different part of Form 1040, covered below.
How to Calculate 2025 Self-Employment Tax Before Completing Schedule SE
Gather your documents
- Completed Schedule C (or Schedule F for farms)
- Income and expense records
- Schedule K-1 (Form 1065), which reports a partner's share of partnership income, deductions and credits
- W-2s showing Social Security wages
- Church or farm income paperwork
- The 2025 Schedule SE instructions
Find net earnings
Take business income and subtract allowable business expenses. Do not start from gross receipts or total 1099 payments. A freelancer who billed $90,000 but had $30,000 of deductible costs has $60,000 of net profit.
If net profit is positive, multiply it by 92.35% (line 4a). The Social Security Administration treats this like employee wages: those wages never include the employer's share of the tax, so yours should not either.
The rates and caps
| Component | 2025 rule |
|---|---|
| Social Security | 12.4% on earnings up to the $176,100 wage base |
| Medicare | 2.9% on all earnings, no cap |
| Combined | 15.3% below the wage base |
| Additional Medicare Tax | 0.9%, calculated separately on Form 8959 |
Additional Medicare Tax thresholds are $250,000 for married filing jointly, $125,000 for married filing separately and $200,000 for other filers. Medicare wages and self-employment income are combined, and wages use up the threshold first.
W-2 Social Security wages count against the wage base. Once wages and self-employment earnings together reach $176,100, no more Social Security tax applies. Medicare tax continues.
Hypothetical example (educational only)
This is an illustration, not a result for any particular taxpayer. Assume a sole proprietor with no W-2 wages:
| Step | Amount |
|---|---|
| Gross receipts | $90,000 |
| Business expenses | $30,000 |
| Net profit (Schedule C line 31) | $60,000 |
| Adjusted earnings ($60,000 × 92.35%) | $55,410 |
| Social Security (12.4%) | $6,870.84 |
| Medicare (2.9%) | $1,606.89 |
| Self-employment tax | $8,477.73 |
| Deductible half | $4,238.87 |
The deductible half reduces income tax. It does not reduce the self-employment tax itself.
How to Fill Out Schedule SE (Form 1040) Line by Line
Use the 2025 form. It has two parts: Part I (Self-Employment Tax) and Part II (Optional Methods). The 2025 form has no separate "short" and "long" versions, so ignore advice built on older years.
Lines 1 to 4: earnings
- 1a: farm profit or loss, from Schedule F line 34 and farm K-1 box 14, code A. Non-farmers can leave it blank.
- 1b: Conservation Reserve Program adjustment for people receiving Social Security retirement or disability benefits.
- 2: nonfarm profit, from Schedule C line 31 and nonfarm K-1 box 14, code A.
- 3: combines 1a, 1b and 2. Multiple businesses go on one Schedule SE, and a loss in one reduces profit in another.
- 4a: line 3 × 92.35% if positive; otherwise carry line 3.
- 4b: optional-method earnings (lines 15 and 17).
- 4c: combines 4a and 4b. Generally stop if it is below $400, unless the church exception applies.
Lines 5 and 6: church income
- 5a: W-2 church income for qualifying church employees.
- 5b: line 5a × 92.35%; enter zero if the result is under $100. Keep the W-2 as support.
- 6: adds 4c and 5b.
Lines 7 to 9: the wage base
- 7: the $176,100 Social Security wage base.
- 8a to 8d: Social Security wages and tips (W-2 boxes 3 and 7) and other covered compensation, totalled on 8d.
- 9: line 7 minus 8d, never below zero.
This is where people with both a job and a side business slip up. Your employer already took Social Security tax on those wages, and line 9 stops you paying it twice.
Lines 10 to 13: the tax
- 10: 12.4% of the smaller of line 6 or line 9.
- 11: 2.9% of line 6.
- 12: total self-employment tax (10 + 11).
- 13: deductible half, which is 50% of line 12.
Where the results go
| Amount | Destination |
|---|---|
| Business profit | Schedule 1 line 3, total on line 10, then Form 1040 line 8 |
| Farm income | Schedule 1 line 6 |
| Self-employment tax (line 12) | Schedule 2 line 4, total on line 21, then Form 1040 line 23 |
| Half deduction (line 13) | Schedule 1 line 15, total on line 26, then Form 1040 line 10 |
Form 1040 lines 8, 10 and 23 also carry other items, so none of them is purely a self-employment line.
Special Situations and Optional Methods
Optional methods
Part II lets some filers report higher earnings than they actually had, which can help earn Social Security coverage credit in a low-income year. The cost is a higher tax bill that year. The maximum optional earnings for 2025 are $7,240.
- Farm method: gross farm income of $10,860 or less, or net farm profit under $7,840. Two-thirds of gross income, capped at $7,240.
- Nonfarm method: net profit under $7,840 and under 72.189% of gross nonfarm income, plus at least $400 of actual net earnings in two of the previous three years. Usable for a maximum of five years.
If you use both methods, combined optional earnings stay capped at $7,240.
Spouses, partners and multiple activities
- Each spouse with self-employment income files a separate Schedule SE, even on a joint return.
- Partners use K-1 box 14, code A. Limited partners include guaranteed payments for services actually performed.
- Statutory-employee Schedule C profit stays out of line 2, while the related W-2 wages go on line 8a.
Working abroad
US citizens and residents generally owe self-employment tax even when working outside the US. The foreign earned income exclusion does not remove earnings from the calculation.
A totalization agreement between the US and another country can prevent double contributions, but exemption usually needs a certificate of coverage from the foreign authority. Attach a copy to your Form 1040 each exempt year, and check the IRS's list of agreements for your country.
When to get professional review
Consider a tax professional if you have:
- Multiple businesses or fluctuating or negative income
- Optional methods in play
- International income
- Entity changes
- Prior-year omissions
- Uncertainty about deductible expenses
VJM Global supports US individual taxpayers and business owners with Form 1040 preparation and tax compliance. Its team of CPAs, Chartered Accountants and US-compliant professionals can review Schedule SE and the related Form 1040 reporting.
What to Do After Completing Schedule SE
Filing and payment
Attach Schedule SE to Form 1040, or let your e-file software include it. For most calendar-year taxpayers the 2025 filing and payment deadline is April 15, 2026.
An automatic six-month extension extends the time to file, not the time to pay. Unpaid tax accrues interest and penalties.
Estimated tax for 2026
Self-employed people usually pay as they earn, using Form 1040-ES. The 2026 instalments are due:
- April 15, 2026
- June 15, 2026
- September 15, 2026
- January 15, 2027
You generally need estimates if you expect to owe at least $1,000 after withholding and credits. The safe harbour is the smaller of 90% of 2026 tax or 100% of 2025 tax.
That figure rises to 110% if 2025 adjusted gross income exceeded $150,000 (or $75,000 if married filing separately for 2026). Farmers and fishers follow a different rule.
Mistake checklist
- Using gross receipts instead of net profit
- Missing business expenses
- Ignoring W-2 Social Security wages on line 8a
- Forgetting the half-tax deduction
- Using a prior-year form
- Leaving out a second business or a spouse's separate schedule
Records
The IRS recordkeeping guidance sets these periods:
- Generally 3 years for income and deduction records
- 6 years if you omitted more than 25% of gross income
- Indefinitely if you filed no return or a fraudulent one
Keep receipts, invoices, deposit records and Forms 1099-NEC. Property and basis records should be kept through the limitations period for the year you dispose of the asset.
Frequently Asked Questions
How do I show my income when I'm self-employed?
Start with business records and report them on Schedule C (or F). Gross receipts and net profit are separate figures. Profit goes to Schedule 1 and into Schedule SE.
What is Schedule SE for?
It calculates Social Security and Medicare tax on net self-employment earnings. It also produces the deduction for half of that tax and gives the SSA earnings information for benefits.
What line on 1040 shows self-employment income?
Business profit flows through Schedule 1 line 3 into Form 1040 line 8. The self-employment tax itself comes from Schedule SE through Schedule 2 line 4 into Form 1040 line 23.
What are Schedule 1 lines 3 and 6?
On the 2025 Schedule 1, line 3 is business income or loss (Schedule C), and line 6 is farm income or loss (Schedule F). Neither is the tax; that is on Schedule 2.
Is there a PDF version of Schedule SE (Form 1040)?
Yes. The IRS publishes the 2025 Schedule SE and separate 2025 instructions. Confirm both say tax year 2025 before you use them.
