Sources: IRS Schedule SE (Form 1040) · IRS Topic 751 (Social Security wage base) · Rev. Proc. 2025-32 (2026 standard deduction, brackets, QBI thresholds) · IRS Form 1040-ES (2026)
The Invisible 15.3%: What Employees Don't See
Every employed worker pays 7.65% in FICA taxes — 6.2% for Social Security and 1.45% for Medicare — deducted from each paycheck. Their employer pays an identical 7.65% on their behalf. The employee never sees the employer's contribution because it comes out of the employer's payroll budget, not the worker's paycheck. When you become self-employed, you are the employer. You pay both the employee (7.65%) and employer (7.65%) portions — 15.3% combined — on your net self-employment income. This is self-employment tax.
The 92.35% Calculation: Why Not 100% of Net Income?
SE tax is applied to 92.35% of net self-employment income — not 100%. This sounds arbitrary, but it has a logical basis: the deductible half of SE tax (explained below) creates a circularity in the calculation. To avoid iterative math, the IRS uses a flat 92.35% multiplier as the SE base.
Formula:
SE base = Net SE income × 92.35% SE tax = SE base × 15.3% Simplified: SE tax ≈ Net SE income × 14.13%
SE Tax at Four Income Levels
| Gross Income | Business Deductions | Net SE Income | SE Base (×92.35%) | SE Tax (×15.3%) | SE Tax Rate on Gross |
|---|---|---|---|---|---|
| $30,000 | $5,000 | $25,000 | $23,088 | $3,532 | 11.8% |
| $50,000 | $8,000 | $42,000 | $38,787 | $5,934 | 11.9% |
| $80,000 | $12,000 | $68,000 | $62,798 | $9,608 | 12.0% |
| $120,000 | $18,000 | $102,000 | $94,197 | $14,412 | 12.0% |
Note: The Social Security portion of SE tax (12.4%) only applies to the first $184,500 of combined wages and SE earnings (after the 92.35% adjustment) in 2026 (IRS Topic 751; up from $176,100 in 2025). The Medicare portion (2.9%) applies to all earnings. High earners above $200,000 (single) / $250,000 (married filing jointly) also owe an additional 0.9% Medicare tax — these thresholds are set by statute and not indexed for inflation.
The SE Tax Deduction: A Partial Offset
The IRS gives self-employed workers a partial concession: you can deduct half of your SE tax from your gross income on Form 1040. This above-the-line deduction reduces both federal income tax and, by reducing AGI, may improve eligibility for other deductions.
Example (2026, single filer): $50,000 gross income, $8,000 business deductions, SE tax = $5,934
- SE deduction = $5,934 ÷ 2 = $2,967
- Adjusted gross income: $50,000 − $8,000 − $2,967 = $39,033
- Minus 2026 standard deduction ($16,100 single; $32,200 married filing jointly): $22,933
- Minus QBI deduction — the lesser of 20% of QBI ($39,033 × 20% = $7,807) or 20% of taxable income ($22,933 × 20% = $4,587): taxable income = $18,346
- Federal income tax: 10% × $12,400 + 12% × $5,946 = ~$1,954 (2026 single brackets)
- Total tax: $5,934 (SE) + $1,954 (federal) = $7,888
- Effective rate on gross income: 15.8%
SE Tax vs. Income Tax: The Stack
Many first-time freelancers are shocked to discover that SE tax is in addition to income tax — not instead of it. On $50,000 of gross income ($42,000 net) in 2026, a single freelancer in a state with no income tax owes approximately:
- SE tax: ~$5,900
- Federal income tax: ~$2,000
- Total federal tax: ~$7,900 (15.8% of gross)
In a state with 5% income tax, add roughly $2,000 more, bringing total taxes to ~$9,900 (19.8% of gross). This is why "set aside 25% of every payment" is common advice — it covers federal + SE + moderate state tax for most freelancers at typical income levels.
Quarterly Estimated Tax Payments
Since taxes aren't withheld from freelance income, you're required to pay them yourself quarterly. If you expect to owe $1,000 or more in federal taxes, you must make quarterly estimated payments using Form 1040-ES. The 2026 due dates are:
| Period | Due Date |
|---|---|
| January 1 – March 31 | April 15, 2026 |
| April 1 – May 31 | June 15, 2026 |
| June 1 – August 31 | September 15, 2026 |
| September 1 – December 31 | January 15, 2027 |
Safe harbor rule: To avoid underpayment penalties, pay either (1) 100% of last year's total tax liability divided into 4 payments, or (2) 90% of the current year's expected tax. High earners (AGI > $150,000 in prior year, or $75,000 if married filing separately) must pay 110% of prior year's tax under the safe harbor. You can skip the January 15, 2027 payment if you file your 2026 return by February 1, 2027 and pay the full balance due (Form 1040-ES).
Use the Rideshare Driver Tax Calculator or Freelance Developer Tax Calculator to estimate your quarterly payments based on income and state.
S-Corp Election: Reducing SE Tax for High Earners
At net SE income above approximately $60,000–$80,000, an S-Corp election may reduce SE taxes. With an S-Corp, you pay yourself a "reasonable salary" (subject to FICA on both sides) and take the remainder as an S-Corp distribution (not subject to SE tax).
Example: $100,000 net profit. Salary = $60,000 (FICA taxes apply). Distribution = $40,000 (no SE tax). SE tax savings ≈ $40,000 × 14.1% = ~$5,640 per year. S-Corp administrative costs (payroll processing, separate return, accountant fees) typically run $1,500–$3,000/year. Net benefit starts around $2,500–4,000/year at $100K income. Consult a CPA before electing S-Corp status.
This is general information, not tax, legal or financial advice. How we source our data · Report an error