Self-employment tax is 15.3%, but it applies to 92.35% of net earnings, and you can deduct half of that tax from AGI.
Source: IRS IRC §1401; IRS Rev. Proc. 2025-32; SSA 2026 wage base; OBBBA P.L. 119-21
Being self-employed means you pay both sides of FICA. That is the employer half and the employee half. That is the core of self-employment tax. Three things dramatically reduce what you actually owe: the 92.35% adjustment, the SE deduction from AGI, and the QBI deduction. The OBBBA made the QBI deduction permanent in 2026. This guide covers all of it with exact math, every 2026 deduction, quarterly due dates, and worked examples at four income levels.
In this guide
- What is self-employment tax?
- How SE tax is calculated - the exact formula
- The SE deduction - deducting half from AGI
- 2026 OBBBA changes for self-employed
- Worked examples at $50k, $75k, $100k, $150k
- Quarterly estimated tax payments - 2026 dates
- Every Schedule C deduction for 2026
- Self-employed retirement accounts - the best tax reducers
- Self-employed vs W-2: the real tax comparison
- Frequently asked questions
1. What Is Self-Employment Tax?
When you work as a W-2 employee, your employer splits FICA taxes with you. They pay 7.65%. You pay 7.65%. When you are self-employed, there is no employer. You pay both halves. That is self-employment (SE) tax: the full 15.3% to fund Social Security and Medicare for yourself.
| Tax component | W-2 employee pays | Employer pays | Self-employed pays |
|---|---|---|---|
| Social Security (OASDI) | 6.2% | 6.2% | 12.4% |
| Medicare (HI) | 1.45% | 1.45% | 2.9% |
| Total FICA / SE tax | 7.65% | 7.65% | 15.3% |
| Additional Medicare surtax | 0.9% over $200k | - | 0.9% over $200k |
2. How SE Tax Is Calculated - The Exact Formula
You do not pay 15.3% on 100% of your net self-employment income. The IRS applies a 92.35% adjustment first. This gives self-employed workers the same treatment as W-2 employees, who do not pay income tax on their employer's FICA contribution.
Step 2: × 92.35% = Net earnings subject to SE tax
Step 3a: Net earnings × 12.4% = Social Security tax (on first $184,500)
Step 3b: Net earnings × 2.9% = Medicare tax (all earnings, no cap)
Step 4: SS tax + Medicare tax = Total SE tax (filed on Schedule SE)
Step 5: SE tax ÷ 2 = Above-the-line deduction from AGI (Schedule 1, Line 15)
| Net SE income (Schedule C profit) | $80,000 |
| × 92.35% adjustment | $73,880 |
| Social Security tax (12.4% × $73,880) | $9,161.12 |
| Medicare tax (2.9% × $73,880) | $2,142.52 |
| Total SE tax (Schedule SE) | $11,303.64 |
| SE deduction (50% of SE tax - reduces AGI) | −$5,651.82 |
| Adjusted gross income after SE deduction | $74,348 |
Source: IRS IRC §1401, §1402; IRS Schedule SE instructions; SSA 2026 wage base $184,500. Cite: IRC §1402(a) defines net earnings subject to SE tax.
3. The SE Deduction - Deducting Half of SE Tax from AGI
Here is the relief Congress built in: you can deduct 50% of your SE tax from your adjusted gross income. This is an above-the-line deduction. It works whether you itemize or take the standard deduction. It reduces your income tax, not your SE tax.
Net SE income
$80,000
SE tax owed
$11,304
SE deduction (50% of SE tax)
−$5,652
Saves ~$1,243 at 22% bracket
4. 2026 OBBBA Changes for Self-Employed Workers NEW
The One Big Beautiful Bill Act (P.L. 119-21, signed July 4, 2025) made several significant changes affecting self-employed workers starting in 2026. These are now permanent law - not expiring provisions.
| Change | Before OBBBA | 2026 (OBBBA) | Impact |
|---|---|---|---|
| QBI deduction (§199A) | Expires end of 2025 | Permanent | Major - plan around it forever now |
| QBI phase-in threshold (single) | ~$47,600 | $75,000 | More earners get full deduction |
| QBI phase-in threshold (MFJ) | ~$95,000 | $150,000 | Couples benefit significantly |
| Minimum QBI deduction | None | $400 (if ≥$1,000 QBI) | Floor for lower earners |
| 1099-NEC filing threshold | $600 | $2,000 | Fewer forms - still taxable income |
| SE tax rate | 15.3% | 15.3% (unchanged) | No change |
QBI Deduction Explained - The Most Powerful Tax Break for Self-Employed 2026
The QBI deduction (IRC §199A) lets most self-employed workers deduct 20% of their qualified business income from federal taxable income. It does NOT reduce SE tax - only income tax. At $80,000 net SE income with $5,652 SE deduction, your adjusted income is $74,348. The QBI deduction is 20% of your QBI: approximately $14,870. Apply that and your federal taxable income drops to ~$59,478 - all the way down from $80,000 gross.
Most sole proprietors, freelancers, and 1099 contractors qualify. Exceptions: lawyers, consultants, financial advisors, and other Specified Service Trade or Business (SSTB) owners whose taxable income exceeds $225,000 (single) or $450,000 (MFJ) in 2026. Source: IRS Rev. Proc. 2025-32; OBBBA P.L. 119-21.
5. Worked Examples - Total Tax at 4 Income Levels
All examples: single filer, standard deduction ($16,100), no state income tax, no other income, QBI deduction claimed when eligible. This is what you actually owe - not the gross SE rate.
| Net SE Income | SE Tax | SE Deduction | QBI Deduction | Federal Income Tax | Total Tax | Eff. Rate | Set Aside/qtr |
|---|---|---|---|---|---|---|---|
| $50,000 | $7,065 | −$3,533 | −$9,293 | $2,787 | $9,852 | 19.7% | $2,463 |
| $75,000 | $10,597 | −$5,299 | −$13,940 | $6,087 | $16,684 | 22.2% | $4,171 |
| $100,000 | $14,130 | −$7,065 | −$18,587 | $10,073 | $24,203 | 24.2% | $6,051 |
| $150,000 | $21,196 | −$10,598 | −$27,880 | $20,241 | $41,437 | 27.6% | $10,359 |
Single filer, standard deduction $16,100, QBI deduction claimed, no state tax, no pre-tax retirement. Source: IRS Rev. Proc. 2025-32; IRC §1401; IRC §199A (OBBBA). Your actual totals depend on deductions - use our paycheck calculator.
The "set aside" rule of thumb - by income level:
Under $40k net
25%
of each payment
$40k-$75k net
27%
of each payment
$75k-$150k net
30%
of each payment
Over $150k net
35%
of each payment
These are federal-only estimates for no-income-tax states. Add your state's rate if applicable. Reduce by 2-5% if you contribute to a Solo 401(k) or SEP-IRA.
6. Quarterly Estimated Tax Payments - 2026 Due Dates
Self-employed workers have no employer withholding taxes from a paycheck. The IRS requires you to pay taxes as you earn income. That means four payments per year. If you expect to owe $1,000 or more in federal tax, you must make quarterly payments or face an underpayment penalty (currently 8% annualized).
| Quarter | Income Period | Due Date | How to Pay |
|---|---|---|---|
| Q1 | Jan 1 - Mar 31, 2026 | April 15, 2026 | IRS Direct Pay / EFTPS |
| Q2 | Apr 1 - May 31, 2026 | June 16, 2026 | IRS Direct Pay / EFTPS |
| Q3 | Jun 1 - Aug 31, 2026 | September 15, 2026 | IRS Direct Pay / EFTPS |
| Q4 | Sep 1 - Dec 31, 2026 | January 15, 2027 | IRS Direct Pay / EFTPS |
Safe Harbor Rule - Avoid Penalties
Pay the lesser of:
- • 90% of your estimated 2026 tax liability, OR
- • 100% of your 2025 tax liability (from last year's return)
- • 110% of 2025 liability if your 2025 AGI exceeded $150,000
If you meet safe harbor, the IRS cannot charge an underpayment penalty - even if you owe more at filing.
How to Pay
- IRS Direct Pay - free, instant, at irs.gov/payments
- EFTPS - Electronic Federal Tax Payment System (free, scheduled)
- Form 1040-ES - mail a check (slowest, not recommended)
- IRS2Go app - mobile payment option
Select "Estimated Tax" and tax year "2026" when making each payment. Keep records of every payment confirmation.
7. Every Schedule C Deduction for 2026
Schedule C deductions reduce your net self-employment income - which reduces both your SE tax AND your income tax. These are dollar-for-dollar reductions before SE tax is calculated. A $1,000 deduction at $100k net income saves approximately $153 in SE tax AND $220 in income tax (22% bracket) = $373 total tax saved per $1,000 deducted.
| Deduction | 2026 Limit / Rule | Reduces SE Tax? |
|---|---|---|
| Home office deduction | Simplified: $5/sq ft up to 300 sq ft ($1,500 max). Regular method: actual %. Must be used exclusively and regularly for business. | Yes ✅ |
| Mileage deduction | 67¢/mile for 2026 (IRS standard rate - verify IRS Notice for 2026 rate). Must log each business trip: date, miles, purpose, destination. | Yes ✅ |
| Health insurance premiums | 100% of premiums for you, spouse, dependents. Above-the-line deduction (Schedule 1, not Schedule C). Cannot exceed net SE income. IRC §162(l). | No ❌ (income tax only) |
| Retirement contributions | SEP-IRA: up to 25% of net SE income, max $70,000. Solo 401(k): up to $23,500 employee + 25% employer, max $70,000 total. SIMPLE IRA: up to $16,500. | No ❌ (income tax only) |
| Business meals | 50% deductible. Must have a business purpose. Document: who, what was discussed, when, where. No entertainment (concerts, sports) deductible. | Yes ✅ |
| Software & subscriptions | 100% deductible if business use. Prorated if mixed personal/business (e.g., Adobe CC, project management tools, Zoom, QuickBooks). | Yes ✅ |
| Professional services | CPA/accountant fees, attorney fees, business consulting - 100% deductible if for business purposes. Your own CPA fees for preparing Schedule C are deductible. | Yes ✅ |
| Education & training | Courses, books, conferences that maintain or improve skills required in your current business. Does not qualify if it's for a new profession. 100% deductible. | Yes ✅ |
| Equipment & devices | Section 179: deduct full cost in year of purchase (up to $1,220,000 for 2026). Computers, cameras, phones, printers - prorated for personal use. Bonus depreciation: 40% in 2026. | Yes ✅ |
| Internet & phone | Business-use portion deductible. If phone is 80% business: 80% of bill deductible. If internet is home-only: deduct via home office calculation instead. | Yes ✅ |
| Advertising & marketing | Website costs, Google Ads, social media ads, business cards, domain registration, logo design - 100% deductible if for business promotion. | Yes ✅ |
| Bank & payment fees | Business bank account fees, PayPal/Stripe processing fees, wire transfer fees - 100% deductible. Personal account fees not deductible. | Yes ✅ |
| Business insurance | Professional liability (E&O), general liability, business property insurance - 100% deductible. Does not include personal life insurance. | Yes ✅ |
| Travel (business) | Flights, hotels, rental cars for business trips - 100% deductible. Mixed business/personal trips: only business days' expenses. Day trips: no overnight = no lodging deduction. | Yes ✅ |
| Startup costs | Deduct up to $5,000 in the first year of business (phases out above $50,000). Remaining costs amortized over 180 months. Includes legal fees, market research, website launch costs. | Yes ✅ |
8. Self-Employed Retirement Accounts - The Best Way to Reduce Taxes
Retirement contributions are the single most powerful above-the-line tax reduction available to self-employed workers. They reduce federal income tax without reducing your QBI deduction - making them doubly efficient.
| Plan | 2026 Max Contribution | Best for | Deadline |
|---|---|---|---|
| Solo 401(k) | $70,000 ($23,500 employee + 25% employer) |
High earners. No employees. Maximum tax deferral. | Dec 31 to establish; Apr 15 to fund |
| SEP-IRA | $70,000 (25% of net SE income) |
Simple setup. No annual filing. Works with employees. | Tax filing deadline (Oct 15 with extension) |
| SIMPLE IRA | $16,500 (+$3,500 catch-up if 50+) |
Self-employed with a few employees. Modest admin. | Must establish by Oct 1 |
| Traditional IRA | $7,000 (+$1,000 catch-up if 50+) |
Lower earners. May be limited by income (MAGI). | Apr 15, 2027 for 2026 tax year |
Max employee contribution: $23,500. Max employer contribution (25% of $100k): $25,000. Total: $48,500.
Tax savings at 22% bracket: $48,500 × 22% = $10,670 in federal income tax avoided.
Plus the QBI deduction on the remaining $51,500 adds another ~$2,263 in savings.
Total tax reduction: ~$12,933 by maxing Solo 401(k) - vs $24,203 total tax without it.
9. Self-Employed vs W-2: The Real Tax Comparison
"Contractors pay more" is often said - and often misunderstood. Here's an honest side-by-side at the same gross income level, showing why a $100,000 1099 contract does NOT equal a $100,000 W-2 salary.
| Tax/benefit | W-2 employee ($100k salary) | Self-employed ($100k net) |
|---|---|---|
| FICA/SE tax (employee share) | $7,650 (7.65%) | $14,130 (14.13% of $100k) |
| Employer FICA (employer pays) | $7,650 (invisible to you) | You pay this too - it's in your $14,130 |
| SE deduction from AGI | Not applicable | −$7,065 |
| Federal income tax | ~$13,372 | ~$10,073 (lower because of deductions) |
| Health insurance | Employer subsidizes (avg $7k/yr) | You buy it ($5k-$15k/yr) |
| Retirement match | Employer match (avg 3-5% of salary) | Self-funded only |
| QBI deduction | Not available | −$18,587 (reduces income tax) |
| Total federal tax burden | ~$21,022 | ~$24,203 (before retirement deductions) |
| Break-even contractor rate needed | $100,000 salary | ~$125,000-$135,000 gross contract |
The general rule: multiply your W-2 target salary by 1.25-1.40 to get a break-even contractor rate - covering extra SE tax, health insurance, no 401(k) match, and no paid leave. This is why "contractor pays more" is only true if the rate is high enough to cover all the hidden costs.
10. Frequently Asked Questions
What taxes do self-employed workers pay in 2026?
How often should I pay estimated taxes?
Can self-employed workers deduct business expenses?
Related guides on PaycheckSense
Sources and methodology
Self-employment tax rates, Schedule SE rules, quarterly estimated payment dates, and QBI provisions verified against IRS and SSA sources for 2026. Worked examples use single filer, standard deduction, and no state income tax unless noted. Educational only - not tax or financial advice.
- IRS: Self-Employment Tax (Social Security and Medicare Taxes)
- IRS Schedule SE - Self-Employment Tax
- IRS Publication 334 - Tax Guide for Small Business (2026)
- IRS Rev. Proc. 2025-32 - 2026 tax year adjustments
- One Big Beautiful Bill Act (OBBBA) - QBI provisions
- SSA: 2026 Social Security wage base ($184,500)
- IRC §1401 - Self-Employment Tax Rate
- IRC §199A - Qualified Business Income Deduction FAQs
Disclaimer: This guide is for informational purposes only. Tax situations vary. The QBI deduction, SE deduction, and deductible expenses are subject to eligibility rules, income thresholds, and phase-outs not fully detailed here. The worked examples use estimates and should not be used as a substitute for professional tax advice. Consult a CPA, enrolled agent, or tax attorney for guidance on your specific situation.
Sources: IRS IRC §1401, §1402, §199A (OBBBA P.L. 119-21); IRS Publication 334 (2026); IRS Rev. Proc. 2025-32; SSA 2026 wage base announcement; IRS Schedule SE and 1040-ES instructions.