What Is Self-Employment Tax?
When you're a W-2 employee, your employer automatically withholds 7.65% of your paycheck for Social Security and Medicare — and they match that with another 7.65% out of their own pocket. Together, that's 15.3% sent to the IRS.
When you're self-employed — a 1099 contractor, gig worker, freelancer, or sole proprietor — you are both the employee and the employer. That means you owe the full 15.3% yourself. This is called the self-employment tax, and it's in addition to your regular federal income tax.
The SE tax is reported on Schedule SE (Form 1040), and it applies to your net earnings from self-employment — your gross income minus eligible business expenses. For 2026, if your net earnings are $400 or more, you must file and pay SE tax.
First-year shock: Many gig workers are blindsided by SE tax. If you made $40,000 last year as a W-2 employee, your employer paid half of your payroll tax. This year, making the same $40,000 on 1099, you owe roughly $5,652 in SE tax alone — before income tax. Plan ahead.
The 15.3% Breakdown: Social Security + Medicare
The self-employment tax is really two separate taxes bundled together:
- Social Security (OASDI): 12.4% — Funds retirement, disability, and survivor benefits. This portion applies only up to the annual wage cap.
- Medicare (HI): 2.9% — Funds Medicare hospital insurance. This portion applies to all of your net earnings, with no cap.
Here's what each portion funds and where your money goes:
| Component | Rate | 2026 Cap | Funds |
|---|---|---|---|
| Social Security | 12.4% | $184,500 | Retirement, disability, survivors |
| Medicare | 2.9% | No cap | Hospital insurance (Part A) |
| Total SE Tax | 15.3% | — | — |
Key takeaway: Most gig workers never hit the Social Security wage cap. For the average Uber driver or DoorDash courier making $30,000–$60,000, the full 15.3% applies to nearly all their earnings. But understanding the cap matters for high earners and those with a W-2 side job.
Social Security Wage Cap ($184,500) & Additional Medicare Tax
For tax year 2026, the Social Security wage base is $184,500. This means the 12.4% Social Security portion only applies to the first $184,500 of your combined W-2 wages and self-employment income. Every dollar above that cap is not subject to the Social Security portion of SE tax.
How the Cap Works With Multiple Income Sources
If you have both W-2 wages and 1099 income, they're combined for the cap calculation. Here's the order of operations:
- Your W-2 employer withholds Social Security tax on your wages up to $184,500.
- If your W-2 wages already exceed the cap, your self-employment income is exempt from the 12.4% Social Security portion (you still pay the 2.9% Medicare portion).
- If your W-2 wages are below the cap, your SE income fills the remaining room before the cap kicks in.
Additional Medicare Tax: The Extra 0.9%
Starting at certain income thresholds, an Additional Medicare Tax of 0.9% kicks in on top of the base 2.9%. This applies to the amount exceeding:
| Filing Status | Threshold |
|---|---|
| Single / Head of Household | $200,000 |
| Married Filing Jointly | $250,000 |
| Married Filing Separately | $125,000 |
Combined W-2 wages and self-employment income count toward these thresholds. If your total earned income surpasses your filing threshold, the 0.9% Additional Medicare Tax applies to the excess — making your effective Medicare rate 3.8% on that portion.
How SE Tax Is Actually Calculated (The 92.35% Rule)
Here's where many first-time filers get confused. The IRS doesn't tax you on 100% of your net self-employment income. Instead, you multiply your net earnings by 92.35% before applying the 15.3% rate. Why?
When you're self-employed, the IRS allows you to deduct the "employer-equivalent" half of your SE tax from your income before calculating the tax itself. Since 7.65% of 100% is 7.65%, and 100% minus 7.65% equals 92.35%, that's the base used for the calculation.
Step 2: Taxable Base = Net SE Earnings × 92.35%
Step 3: SE Tax = Taxable Base × 15.3%
This 92.35% adjustment is automatic on Schedule SE — you don't have to calculate it manually. Your tax software handles it. But understanding it helps you see why your effective SE tax rate is closer to 14.13% (92.35% × 15.3%) rather than a full 15.3%.
Real Examples: $30K, $60K, and $120K Income
Let's walk through three realistic gig worker scenarios. All examples assume the worker files as Single with no other income and takes the standard deduction.
Scenario 1: $30,000 Net Business Income
Example: DoorDash Driver Making $30K Net
Taxable base: $30,000 × 92.35% = $27,705
SE tax: $27,705 × 15.3% = $4,239
Half-deduction (reduces income tax): $4,239 ÷ 2 = $2,120
Taxable income for income tax: $30,000 − $2,120 − $16,100 (standard deduction) = $11,780
Income tax (~10-12% bracket): ≈ $1,254
Total federal tax: $4,239 + $1,254 = $5,493 (18.3% effective)
Scenario 2: $60,000 Net Business Income
Example: Rideshare Driver Making $60K Net
Taxable base: $60,000 × 92.35% = $55,410
SE tax: $55,410 × 15.3% = $8,478
Half-deduction: $8,478 ÷ 2 = $4,239
Taxable income: $60,000 − $4,239 − $16,100 = $39,661
Income tax (12% bracket, partial 22%): ≈ $4,972
Total federal tax: $8,478 + $4,972 = $13,450 (22.4% effective)
Scenario 3: $120,000 Net Business Income
Example: Freelance Developer Making $120K Net
Taxable base: $120,000 × 92.35% = $110,820
SE tax: ($110,820 × 15.3%) — all under $184,500 cap = $16,955
Half-deduction: $16,955 ÷ 2 = $8,478
Taxable income: $120,000 − $8,478 − $16,100 = $95,422
Income tax (mixed brackets up to 22%): ≈ $16,107
Total federal tax: $16,955 + $16,107 = $33,062 (27.6% effective)
Pattern alert: As your income rises, your effective tax rate climbs. At $30K, you keep about 82% after federal taxes. At $120K, you keep about 72%. This is why tax planning matters — and why claiming every deduction you're entitled to can save thousands.
The Half-Deduction: How You Get Some Back
One of the few bright spots in all of this: the IRS lets you deduct 50% of your self-employment tax as an above-the-line adjustment to income. This is not a refund or a credit — it reduces your adjusted gross income (AGI), which in turn lowers your regular income tax.
Here's what makes the half-deduction valuable:
- Above-the-line deduction: You don't need to itemize. Every 1099 filer gets it automatically.
- Reduces AGI: A lower AGI can help you qualify for other tax benefits with AGI phaseouts — like the Earned Income Tax Credit, IRA deductions, and education credits.
- Partial offset: While it doesn't eliminate the SE tax itself, it partially offsets the burden by reducing your income tax bill.
Example: Half-Deduction Value at $60K Income
SE tax: $8,478
Half-deduction: $4,239
Marginal tax bracket: 22% (for a portion of income)
Income tax reduction: $4,239 × 22% ≈ $933
Net SE tax burden after half-deduction benefit: $8,478 − $933 = $7,545
Effective SE rate after half-deduction: ~13.6%
W-2 vs. 1099: Payroll Tax Comparison
The single biggest tax difference between being an employee and a contractor is who pays the payroll tax. Here's a side-by-side comparison:
| Aspect | W-2 Employee | 1099 Contractor |
|---|---|---|
| Social Security (6.2%) | You pay from paycheck | You pay 12.4% on Schedule SE |
| Medicare (1.45%) | You pay from paycheck | You pay 2.9% on Schedule SE |
| Employer match (7.65%) | Employer pays | You pay this too |
| Total payroll tax burden | 7.65% (visible) | 15.3% (visible) |
| Half-deduction | Not applicable | Deduct 50% of SE tax from AGI |
| Withholding | Automatic per paycheck | You handle it (quarterly estimates) |
| Tax form | W-2 | Schedule C + Schedule SE |
| Business deductions | Limited (unreimbursed) | Full Schedule C deductions |
The "1099 premium": A common rule of thumb is that you need to earn roughly 30–40% more as a 1099 contractor to match the same after-tax, after-benefits take-home pay of a W-2 employee. This accounts for the extra 7.65% SE tax, lack of benefits, and unpaid time off. When negotiating rates, factor this in.
How Business Deductions Lower Your SE Tax
Every dollar of legitimate business expense you deduct on Schedule C reduces your net self-employment earnings — and therefore reduces your SE tax by 14.13 cents per dollar deducted (92.35% × 15.3%). This is why tracking every deductible expense is so critical for 1099 workers.
Common deductions that directly lower your SE tax:
- Mileage: At $0.725/mile in 2026, driving 15,000 business miles = $10,875 deduction. That alone saves ~$1,537 in SE tax.
- Phone & internet: The business-use percentage of your phone bill and data plan.
- Supplies & equipment: Hot bags, phone mounts, dash cams, cleaning supplies.
- Platform fees: Uber/Lyft service fees, Upwork commissions, Etsy transaction fees.
- Health insurance premiums: Deductible on your 1040 (not Schedule C) but still reduces AGI.
Example: The Power of Deductions
Without deductions: $60,000 gross → SE tax = $8,478
With $15,000 in deductions: $45,000 net → SE tax base = $41,558 → SE tax = $6,358
SE tax saved: $2,120 — just from tracking expenses
Plus income tax savings on top of that. See our full deductions checklist →
5 Strategies to Reduce Your SE Tax Legally
1. Track Every Business Mile
Mileage is the single largest deduction for most gig workers who drive. At $0.725/mile, the numbers add up fast. Use a mileage tracking app, keep a contemporaneous log, and never estimate. Learn more →
2. Max Out Retirement Contributions
Contributions to a SEP-IRA, Solo 401(k), or SIMPLE IRA reduce your net earnings on Schedule C (if structured as employer contributions) or reduce your AGI. A SEP-IRA lets you contribute up to 25% of net earnings, up to $70,000 for 2026.
3. Time Your Expenses
If you're close to a tax bracket boundary or expect higher income next year, consider accelerating deductible purchases into the current year. Buying that new laptop, phone, or equipment in December instead of January can reduce this year's SE tax.
4. Use the Home Office Deduction
If you have a dedicated space used regularly and exclusively for your gig business — even if it's just a desk in the corner for managing deliveries, tracking expenses, and filing taxes — you may qualify for the home office deduction. The simplified method gives you $5/sq ft up to 300 sq ft ($1,500 max).
5. Consider an S-Corp Election
If your net business income consistently exceeds $60,000–$80,000, electing S-Corp status may reduce SE tax. As an S-Corp, you pay yourself a reasonable salary (subject to payroll tax) and take the remaining profit as distributions (not subject to SE tax). This is complex and requires payroll setup, so consult a CPA.