Self-Employment Tax Explained (2026): The 15.3% Nobody Warns You About

The first year you're self-employed, there's a nasty surprise waiting in your tax bill. It's called self-employment tax, it's 15.3%, and almost nobody warns you about it until it's too late to plan for.

Here's exactly what it is, why it exists, and how to legally shrink it once you're making real money.

Why self-employment tax exists¶

When you have a normal job, Social Security and Medicare (together called FICA) are split between you and your employer:

When you're self-employed, you're both the employee and the employer — so you pay both halves. That's the whole surprise in one sentence: your former employer used to quietly cover half of this, and now you're on the hook for all of it.

What the 15.3% breaks down into¶

Social Security (up to the cap)12.4%

Medicare (no cap)2.9%

• 12.4% Social Security — but only on net self-employment earnings up to $184,500 in 2026 (the "wage base"). Earnings above that aren't hit by this portion.
• 2.9% Medicare — on all your net earnings, with no cap. An additional 0.9% Medicare tax applies above $200,000 (single) or $250,000 (married filing jointly).

A worked example¶

Say your business nets $80,000 in profit. Roughly:

1. 1

   Start with net profit

   $80,000 in net self-employment earnings. Self-employment tax isn't calculated on all of it — it applies to 92.35%, which is $73,880.

2. 2

   Apply 15.3% to that figure

   $73,880 × 15.3% = $11,303.64 in self-employment tax, before a dollar of income tax. That splits as $9,161.12 Social Security and $2,142.52 Medicare.

3. 3

   Then add income tax

   Your regular federal (and usually state) income tax stacks on top of that, based on your bracket.

4. 4

   Take the deductions

   You deduct the employer-equivalent half — $5,651.82 on this example — as an above-the-line deduction, which lowers your income tax. It softens the blow but doesn't reduce the self-employment tax itself.

How an S-corp legally reduces the bill¶

This is the entire reason the S-corp election exists. As a default LLC, you pay the 15.3% on all your profit. With an S-corp election, you split your income:

• A reasonable salary — which pays payroll (self-employment) tax
• Distributions — which do not pay self-employment tax

Frequently asked questions¶

Self-employment tax is the price of being your own boss. It's real, it's 15.3%, and the people who plan for it sleep fine in April. It's just business — set the money aside.

Sources

1. IRS — Self-Employment Tax (Social Security and Medicare Taxes)
   +How this was checked

   Confirms the 15.3% rate as '12.4% for social security (old-age, survivors, and disability insurance) and 2.9% for Medicare (hospital insurance)'; that the Medicare portion has no cap, applying to 'all your net earnings'; that an additional 0.9% Medicare Tax applies above $200,000 (single) or $250,000 (married filing jointly); that you 'can deduct the employer-equivalent portion' of the tax; and that the filing requirement applies if 'your net earnings from self-employment (excluding church employee income) were $400 or more.' Confirmed by direct fetch.

2. Social Security Administration — Contribution and Benefit Base
   +How this was checked

   Source of the wage base figures: $168,600 (2024), $176,100 (2025) and $184,500 (2026). SSA states the base 'limits the amount of earnings subject to taxation for a given year' and that 'the same annual limit also applies when those earnings are used in a benefit computation,' adjusting yearly with 'changes in the national average wage index.' Confirmed by direct fetch. The worked example in this piece was computed rather than cited and is reproducible: $80,000 net profit x 92.35% = $73,880 of net earnings subject to the tax; x 15.3% = $11,303.64, comprising $9,161.12 Social Security (12.4%) and $2,142.52 Medicare (2.9%), with a deductible employer-equivalent half of $5,651.82. As a check on method, SSA's own stated 2026 figure of $11,439.00 in OASDI tax at the taxable maximum reproduces exactly as $184,500 x 6.2%.