Introduction
Freelancers face a tax structure different from W-2 employees. The biggest surprise is self-employment (SE) tax — a 15.3% charge on net earnings that arrives on top of regular income tax.
Definitions
- Self-Employment Tax: Social Security (12.4%) + Medicare (2.9%) = 15.3% on net SE earnings, per IRS guidance.
- 1099-NEC: IRS form clients issue for payments ≥ $600 to non-employees.
- Quarterly Estimated Tax: Required prepayments to the IRS (Form 1040-ES) if you expect to owe ≥ $1,000.
- Schedule C: Business profit/loss reported on the individual return.
Why It Matters
A freelancer who treats their gross revenue as take-home will be 30–45% short when tax season arrives. Failing to pay quarterly triggers underpayment penalties.
How It Works
- Track gross income from all clients.
- Subtract deductible business expenses → net profit (Schedule C).
- Compute SE tax on 92.35% of net profit.
- Net profit is added to other income; total is taxed at federal + state rates.
- Pay quarterly: April 15, June 15, September 15, January 15.
Formula
Self-Employment Tax
$$ \text{SE Tax} = \text{Net Profit} \times 0.9235 \times 0.153 $$
Deductible Half of SE Tax (adjusts AGI)
$$ \text{Deduction} = \text{SE Tax} \times 0.5 $$
Variable Definitions
- 0.9235 — IRS adjustment so SE tax is computed only on the employee-equivalent portion
- 0.153 — combined SS (12.4%) + Medicare (2.9%) rate
- Net Profit — Schedule C line: revenue minus deductible expenses
Worked Example
- Gross revenue: $100,000
- Deductible expenses: $20,000
- Net profit: $80,000
SE tax = 80,000 × 0.9235 × 0.153 = $11,304 Deductible half = $5,652
Then federal income tax applies on (net profit − $5,652) using regular brackets.
Common Deductions
| Category | Examples |
|---|---|
| Home office | Pro-rated rent, utilities |
| Equipment | Computer, monitor, phone (or §179 deduction) |
| Software/Subscriptions | SaaS, design tools |
| Health insurance | Self-employed deduction (above-line) |
| Retirement | Solo 401(k), SEP-IRA contributions |
| Mileage | $0.67/mile in 2024 (IRS standard) |
| Professional services | Accountant, legal |
Quarterly Estimated Tax
Safe-harbor: pay 100% of prior year's tax (110% if AGI > $150k) to avoid penalties. Use Form 1040-ES.
Common Mistakes
- Not setting aside 25–35% of every invoice for taxes
- Missing quarterly deadlines (triggers Form 2210 penalty)
- Mixing personal and business bank accounts (kills audit defense)
- Forgetting state and local taxes (varies by jurisdiction)
Related Calculators
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Conclusion
Treat taxes as a fixed 30%+ cost of doing business. Open a separate tax savings account, automate transfers per invoice, and pay quarterly. This is not optional — it is the cost of independence.