Does the Foreign Earned Income Exclusion remove self-employment tax?

No. Section 911 excludes foreign earned income from income tax only. Self-employment tax under Schedule SE is computed on 92.35% of your net self-employment earnings before the exclusion is applied, so a freelancer abroad can exclude every dollar of income from income tax and still owe roughly 15.3% in self-employment tax.

How do I avoid paying social security twice?

A totalization agreement assigns social-security coverage to exactly one country. The United States has 30 such agreements in force. If you contribute to your country of residence's system and it has an agreement, you obtain a certificate of coverage from that country's social security authority and keep it with your records — that is what removes the US self-employment tax.

What is a certificate of coverage?

It is a document issued by the social security authority of the country whose system covers you, stating that you contribute there. It is the evidence that the totalization agreement assigns your coverage away from the United States. The agreement existing is not enough on its own — without the certificate the IRS default is that US self-employment tax applies.

What if my country has no totalization agreement?

US self-employment tax generally applies in full on your net earnings, and you may also be liable into the local system. That double charge is precisely what agreements exist to prevent, and there is no substitute relief: the foreign tax credit does not offset self-employment tax, because self-employment tax is not an income tax.

Do I have to make quarterly estimated payments?

Usually yes. Self-employment tax is not withheld by anyone, so it typically has to be paid through quarterly 1040-ES estimated payments. Underpayment penalties apply even when the annual return is filed on time under the automatic expat extension.

US Self-Employment Tax Abroad Calculator

US self-employment tax for freelancers abroad

Estimate the US self-employment tax on your freelance or contractor earnings abroad — and see why the Foreign Earned Income Exclusion does not remove it, and what does.

Self-employment tax under §1401 has two parts, applied to 92.35% of your net self-employment income (§1402(a)(12)):

OASDI, 12.4%, up to the Social Security wage base for the year. Any W-2 wages consume that base first.
Medicare, 2.9%, with no ceiling.

One-half of the resulting tax is deductible against income tax under §164(f), which the result reports separately.

This uses the same function as the paid Atamatax package — computeSelfEmploymentTax in the tax engine — rather than a second copy of the rates and wage-base table. A free tool that quotes a different number than the product it feeds is worse than no tool.

Where the totalization result comes from

The country list records agreements the Social Security Administration reports as in force, and distinguishes them from agreements merely signed. Mexico is the case that matters: an agreement was signed in 2004 and has never entered into force, so it provides no relief today. Verify your own position against SSA's agreement overview.

Limitations

The 0.9% Additional Medicare Tax (Form 8959) above the filing-status threshold is not included.
Church employee income, optional methods and farm income are not modelled.
Income earned through a foreign corporation follows different rules and may bring Form 5471 into scope.
This does not decide whether your engagement is self-employment or foreign employment — a question your contract and local law answer.

Sources

IRC §1401, §1402(a)(12), §164(f) — self-employment tax and the deductible half.
SSA annual OASDI contribution and benefit base.
SSA, U.S. International Social Security Agreements.

Before you rely on this result

What would settle it, and what covers it

Documents or facts needed

• Net self-employment profit for the year
• The country whose social system covers you
• A certificate of coverage, if one exists

Where this leads

Simple · $299 — prepares Schedule C and Schedule SE with the exclusion or credit.

Also possible: Complex ($799). The cheapest route that covers your facts is the right one; a package never covers more than one tax year.

How to read a status

Likely:: The facts entered meet the published test; confirm the inputs before acting.
Possible:: Some facts point this way and others are missing; more information decides it.
Needs review:: These inputs leave it open; a person should look before filing.
Not currently indicated:: Nothing entered triggers it this year; a changed fact can change the answer.
Outside supported scope:: This item is routed to a professional for preparation.

Scope. Self-employment tax on the profit entered; a totalization certificate can remove it and is not assumed. This is a computation on the answers you gave, not individualized tax advice.

What changes the result

This answer changes if…

Whether the exclusion or the credit is the better route

…your foreign income tax rate is above the U.S. rate on the same income — the foreign tax credit tends to leave no U.S. tax and carries excess credit forward; the exclusion cannot.
…you were in the United States for more than 35 days in the twelve-month period — the physical-presence test for the exclusion is lost for that period.
…the income is a pension, a distribution or investment income rather than earned income — the exclusion covers earned income only; the credit covers foreign tax on any category.
…you claimed the exclusion in a prior year and now revoke it — a revocation locks the exclusion out for five years without IRS consent.
…you have self-employment income — the exclusion does not reduce U.S. self-employment tax; a totalization certificate does.

Whether the 3.8% net investment income tax applies

…your modified adjusted gross income is below the threshold for your filing status — the tax applies only to the lesser of net investment income and the excess over the threshold. Check it
…you claim the foreign earned income exclusion — excluded wages are added back for the threshold test.
…you rely on a treaty to credit foreign tax against this tax — the credit against the net investment income tax rests on a treaty article and on litigated positions, not on Form 1116.
…a PFIC is under a QEF election — QEF inclusions enter net investment income only under a separate election (the 'section 1.1411-10(g)' election).

Each line names a fact that moves the result; what it moves to depends on the rest of your facts. Nothing here is a determination.

How Atamatax calculations are produced — the tests applied, statutory sources and review cadence — is documented in the methodology, and how the engine is validated in accuracy & review. Calculation fixes are recorded in the changelog.

Authorities cited

IRC §1401 — IRC §1401 — Rate of self-employment tax
U.S.–Switzerland Totalization Agreement — U.S.–Switzerland Social Security (Totalization) Agreement
IRS Publication 54 — About Publication 54 — Tax Guide for U.S. Citizens and Resident Aliens Abroad

Primary sources (Cornell Legal Information Institute for the US Code and CFR; IRS.gov for forms, procedures, and treaty documents). This page is general information, not individualized tax or legal advice.