Tax Help Center

What Is Self-Employment Tax?

Self-employment tax is one of the biggest surprises for people who move into 1099 or self-employed income. The phrase sounds technical, but the planning question is simple: why is the tax bill bigger than expected?

Quick answer

Self-employment tax is the federal tax self-employed people generally pay for Social Security and Medicare when they are not having those amounts withheld by an employer.

Who this page is for

Professionals, freelancers, contractors, and 1099 earners trying to understand why self-employed income often needs a larger set-aside than expected.

Last reviewed April 2026 Self-employment tax basics Built for 1099 and self-employed planning

Use this page as educational planning guidance. When the stakes are high, verify final filing positions with current IRS instructions or a qualified tax professional.

When to use this page

Use this page when you have 1099 or self-employed income and need to understand why your tax savings target may be higher than expected.

When to get extra help

Get extra help when multiple income types overlap, expenses are unclear, or you need help estimating the year instead of just defining the term.

Official sources

What to gather

  • 1099 forms
  • Income totals from statements or bookkeeping
  • Any estimate of deductions or business expenses

Best first move

If you are self-employed, do not treat your tax rate like a simple income-tax-only number. Start with a planning tool or calculator that considers self-employment tax too.

Next steps

  1. Review your 1099 and business income totals.
  2. Estimate likely deductions so net self-employment income is clearer.
  3. Use the quarterly or set-aside pages to decide what to save next.

Why people miss this tax

Many people compare 1099 income to a paycheck and forget that no employer is withholding Social Security and Medicare taxes on the front end.

Why it matters for planning

Self-employment tax changes how much cash feels truly available. It is one reason a simple savings percentage can be too low if the picture is incomplete.

How TaxHackAI helps

TaxHackAI helps professionals keep statement activity, likely deductions, and 1099 totals visible so the set-aside decision is grounded in real numbers instead of vague fear.

How TaxHackAI works

1. Upload
Import a bank statement or save a 1099 so your tax picture starts from real source documents.
2. Review
Check likely deductions and resolve anything uncertain so transfers or mixed-use spending do not distort the estimate.
3. Plan
Use the latest-day view, deduction output, 1099 totals, and quarter gap to decide what still needs to be set aside.

Common questions

Straight answers for professionals comparing tax tracking, deductions, 1099s, and quarterly planning.
FAQ

Is self-employment tax the same as income tax?

No. It is separate from income tax and is one reason self-employed planning often needs a larger savings target.

Does it apply only to contractors?

No. It generally applies to self-employed earnings more broadly, not just one label of worker.

Why does this matter for 1099 planning?

Because 1099 earners often need to save for more than just federal income tax.