Self-Employment Tax: The 15.3% Most 1099 Earners Underestimate

Last updated: July 2026 | Covers tax years 2025 and 2026

The short answer

Self-employment tax is 15.3% of net earnings (92.35% of profit), split into 12.4% for Social Security (capped at the annual wage base) and 2.9% for Medicare (uncapped), and half of what you pay is deductible above the line.

15.3%
total SE tax rate
12.4%
Social Security portion
2.9%
Medicare portion
50%
of SE tax deductible above the line

Figures are IRS Schedule SE and Publication 334 rules for educational reference only.

Why this shocks new freelancers

When you work for an employer, 7.65% of your paycheck funds Social Security and Medicare (the "FICA" withholding) and your employer matches the other 7.65% behind the scenes. When you work for yourself, you pay both halves, 15.3% total, on top of your ordinary federal and state income tax. This is the single biggest reason first-year freelancers get hit with surprise tax bills in April: they budgeted for their income-tax bracket but forgot SE tax entirely. On $80,000 of net self-employment income, SE tax alone is over $11,300 before any income tax applies.

Source: IRS Sched SE (Self-Employment Tax) and Pub. 334 · Scope: federal payroll tax · Social Security wage base: $176,100 (2025), $184,500 (2026)

How the 15.3% rate breaks down

SE tax has two components: 12.4% for Social Security and 2.9% for Medicare, totaling 15.3%. The Social Security portion stops at the annual wage base ($176,100 for 2025; $184,500 for 2026, per the Social Security Administration's October 2025 announcement), so earnings above that cap face only the 2.9% Medicare tax. An additional 0.9% Medicare surtax applies to self-employment earnings above $200,000 ($250,000 for joint filers), with no upper limit. These surtax thresholds aren't indexed to inflation, so more households drift into the surtax each year.

The 92.35% adjustment

Before applying the 15.3% rate, you multiply net self-employment earnings by 92.35%. This is a bookkeeping trick that approximates the employer's half of FICA being deductible, it ensures self-employed workers don't pay tax on the "employer-side" portion of their own tax. In practice this means the effective SE tax rate on net earnings below the wage base is about 14.13%, not 15.3%.

Above-the-line deduction for half

You can deduct 50% of the SE tax you pay as an above-the-line adjustment (Schedule 1, Line 15). This reduces your adjusted gross income but not your SE tax itself. The deduction is automatic, no itemizing required, and it's one of the few tax breaks that benefits taxpayers regardless of whether they take the standard deduction or itemize. It does not reduce FICA-equivalent owed, only income tax owed on the same earnings.

Quarterly estimated payments

Self-employed workers generally pay estimated tax through quarterly payments due April 15, June 15, September 15, and January 15 of the following year. IRS safe-harbor rules (Form 1040-ES) define when underpayment penalties do not apply: typically 90% of the current year's tax or 100% of the prior year's (110% when prior-year AGI exceeded $150,000).

S-corporation wage and distribution rules (IRS)

An S-corporation owner who performs services for the corporation generally must receive reasonable compensation as wages subject to employment tax. Corporate distributions beyond wages are not subject to self-employment tax. The IRS evaluates whether reported wages reflect the work performed; insufficient wages on Form 1120-S can be recharacterized. Electing S-corp status also requires payroll filings, corporate returns, and state franchise fees where applicable.

Published retirement contribution limits

SEP-IRAs and Solo 401(k) plans allow self-employed workers to defer income for retirement under IRS limits. For 2026, employee deferrals in a Solo 401(k) may reach $24,500 (up from $23,500 in 2025), with an additional employer contribution of roughly 20% of net self-employment earnings, subject to an overall cap of $72,000 (up from $70,000 in 2025). Contributions reduce adjusted gross income for income tax but do not reduce self-employment tax on the same earnings.

What to do with this

The 92.35% adjustment and the 50% above-the-line deduction both apply automatically, but only if you know they exist.

  • On $80,000 of net self-employment income, SE tax alone is over $11,300 before any income tax applies, budget for it separately from your income-tax bracket. Tax calculator
  • Half of your SE tax is deductible above the line (Schedule 1, Line 15) automatically, no itemizing required, it reduces AGI but not the SE tax itself. Federal tax-rate reference
  • File quarterly, not annually: the same 100%/110% prior-year or 90% current-year safe harbor that applies to income tax also covers SE tax. Quarterly estimated taxes

Figures are IRS Schedule SE and Publication 334 rules for educational reference only; S-corp wage reasonableness and retirement-contribution elections depend on your own facts, this is not a filing recommendation.

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