Self-Employment Tax for US Expats: How to Avoid Paying Social Security Twice

Self-employment is one of the most tax-penalized situations for US expats. While the Foreign Earned Income Exclusion (FEIE) can eliminate your federal income tax on up to $132,900 (2026), it does nothing for self-employment tax. A self-employed US expat earning $100,000 abroad could owe $14,130 in SE tax alone, even if their income tax is zero after the FEIE.

The good news: if you live in one of the 30 countries that have a totalization agreement with the US, you can legally avoid this double taxation. Here is exactly how it works, what documents you need, and how to survive an IRS audit.

What Is Self-Employment Tax?

Self-employment tax is the Social Security and Medicare tax that self-employed individuals pay. Employees split this cost with their employer (each pays 7.65%), but self-employed people pay both halves:

• Social Security: 12.4% on net earnings up to $176,200 (2026 cap)
• Medicare: 2.9% on all net earnings (no cap)
• Additional Medicare: 0.9% on earnings above $200,000 (single) or $250,000 (married filing jointly)

SE tax is calculated on Schedule SE and added to your Form 1040. It is separate from income tax and is not affected by the FEIE, the Foreign Tax Credit, or tax treaty provisions.

Totalization Agreements: The Legal Way Out

The US has signed bilateral Social Security agreements (totalization agreements) with 30 countries. The core principle: you only pay social security tax to one country, not both. For self-employed expats, the general rule is:

• If you live and work in a totalization agreement country, you pay into that country's system only.
• If you live abroad but your principal business activity is in the US, you pay US SE tax.
• If you work in both countries, the agreement specifies rules based on where your principal activity is.

The 30 Totalization Agreement Countries

Notable absences: Mexico, UAE, Thailand, Singapore, Indonesia, Israel, India, China, and most of Southeast Asia and the Middle East. If you live in a non-agreement country, you owe US SE tax in full, regardless of what you pay locally.

How to Claim the SE Tax Exemption: Step by Step

Step 1: Register with the Local Social Security System

You must be actively enrolled and contributing to the host country's social security system. Simply living in a totalization agreement country is not enough. Examples:

• France: Register as auto-entrepreneur or travailleur independant with URSSAF. Pay quarterly cotisations.
• Germany: Register with the Deutsche Rentenversicherung (German pension insurance).
• UK: Pay Class 2 or Class 4 National Insurance contributions to HMRC.
• Canada: Contribute to CPP (Canada Pension Plan).

Step 2: Obtain a Certificate of Coverage

Request an official Certificate of Coverage from the host country's social security agency. This is the document that proves to the IRS that you are covered under the foreign system. Each country has its own process:

• France: Request a certificat de detachement or attestation from URSSAF/CPAM.
• Germany: Apply through the Deutsche Rentenversicherung.
• UK: Request form CA3822 from HMRC.
• General: Contact the host country's social security administration and ask for a "Certificate of Coverage under the US-[Country] Totalization Agreement."

Step 3: File Your US Tax Return with the Exemption

On your Form 1040:

• Attach a photocopy of the Certificate of Coverage.
• On the line for self-employment tax (Schedule SE), write "Exempt, see attached statement".
• Include a brief statement explaining that you are exempt under the US-[Country] Totalization Agreement and are contributing to [Country]'s social security system.

Do not simply omit Schedule SE. The IRS needs to see that you actively claimed the exemption with supporting documentation.

What to Keep in Case of IRS Audit

The IRS can challenge your SE tax exemption. Here is what you need to have ready:

Country Spotlight: France

France is one of the most common destinations for US expats. Here is how the totalization agreement works in practice for self-employed Americans in France:

• Registration: Register with URSSAF as travailleur independant (or micro-entrepreneur for small businesses). This is mandatory within 8 days of starting activity.
• Cotisations: French social charges (cotisations sociales) range from ~22% for micro-entrepreneurs to ~45% for the regime reel. This covers health insurance (assurance maladie), retirement (retraite), disability, and family allocations.
• Certificate: Request an attestation de couverture sociale from URSSAF or your CPAM. Specify that it is for the US-France totalization agreement.
• Result: You pay French cotisations (which are often higher than US SE tax) but are exempt from US SE tax. You still owe US income tax (reduced by FEIE or FTC).

For more on France-specific tax obligations, see our US Expat Taxes in France guide.

No Totalization Agreement? Your Options Are Limited

If you live in a country without a totalization agreement (UAE, Thailand, Singapore, Mexico, etc.), you owe US SE tax in full, even if you also pay local social security contributions. This means genuine double taxation on the social security component, with no relief.

Your only options:

• Structure as a corporation: If you incorporate your business (e.g., as an S-Corp or C-Corp), you receive a salary instead of SE income. You pay employer + employee FICA on the salary, but can keep some earnings as distributions not subject to SE tax. Consult a CPA.
• Relocate to a totalization country: If SE tax is a significant cost and you have flexibility, moving to a country with an agreement can save 15.3% of your earnings.
• Deduct half of SE tax: You can deduct 50% of your SE tax on your 1040 (line 15). This reduces your income tax but not the SE tax itself.

Which Tax Software Handles SE Tax Exemption?

Not all tax software supports the totalization agreement exemption correctly. See our Best Tax Filing Services guide for a full comparison. In summary:

• MyExpatTaxes: Supports totalization agreements and SE tax exemption.
• TurboTax: Can handle the exemption but requires manual entry -- you must know what to do.
• H&R Block Expat (CPA tier): A tax professional will handle it for you.
• Greenback / TFX / CPAs for Expats: Full-service CPAs handle all totalization agreement claims.

Bottom Line

Self-employment tax is the biggest hidden cost for US expats working independently abroad. The FEIE does not help. But if you live in one of the 30 totalization agreement countries and are paying into the local system, you can legally eliminate the 15.3% US SE tax. The key is documentation: get your Certificate of Coverage, keep your proof of payments, and attach everything to your return.

If you are behind on this, the Streamlined Filing Compliance Procedure allows you to retroactively claim the exemption for prior years without penalties. Consult a CPA specializing in expat taxes.