If you are a U.S. citizen living abroad, Social Security tax is one of the most confusing pieces of the puzzle. Many expats assume that because they no longer live in the United States, they are off the hook for Social Security. In reality, whether you owe Social Security tax depends less on where you live and more on who you work for and whether you are an employee or self-employed. Understanding the rules can save you thousands of dollars and help you protect your future benefits.
Quick Answer Summary
Short answer:
Yes, many U.S. expats still have to pay Social Security tax, but not all. It depends on your work situation:
Employee of a U.S. employer abroad: Your wages are generally subject to U.S. Social Security (FICA) and Medicare taxes, even if all of your work is performed overseas. IRS
Employee of a foreign employer abroad: Your wages are usually not subject to U.S. Social Security and Medicare tax (local rules and treaties still apply). IRS
Self-employed U.S. expat: You are typically subject to U.S. self-employment tax (15.3% up to the annual wage base), even if you exclude your foreign earned income from income tax, unless a totalization agreement shifts coverage to the foreign country. Taxes for Expats+1
In my view, most expats are better off treating Social Security tax as part of their overall retirement strategy, not just as a cost to escape. Paying in strategically can preserve valuable benefits later.
How Social Security Tax Works for Americans Abroad
The United States is unusual because it taxes citizens and resident aliens on worldwide income, whether they live in the U.S. or not. You must report all taxable income and may also be subject to employment taxes (including Social Security and Medicare), unless a specific exemption or treaty applies. IRS+1
Key concepts:
Social Security and Medicare tax on wages (FICA):
Paid by employees and employers on U.S. “covered” wages.
Self-employment tax (SECA):
Paid by self-employed individuals at a combined rate of 15.3% (12.4% Social Security + 2.9% Medicare), up to the annual Social Security wage base. 1040 Abroad
Foreign Earned Income Exclusion (FEIE):
Lets qualifying expats exclude up to about $130,000 of foreign earned income in 2025 from income tax – but it does not erase U.S. Social Security/self-employment tax. Wikipedia+1
That last point trips up many expats: you can exclude income from income tax, but still owe Social Security/self-employment tax on the same earnings.
Rule #1: Who Your Employer Is Matters
1. U.S. Employer Abroad
If you are a U.S. citizen or resident working outside the U.S. for an American employer, your wages are generally still subject to U.S. Social Security and Medicare tax. IRS+1
An “American employer” typically includes:
A U.S. corporation
A U.S. partnership with at least two-thirds U.S. partners
A U.S. government entity
Certain foreign affiliates where a U.S. parent has elected coverage
Example:
You move to Portugal but stay on W-2 payroll for your California tech company, working fully remote. Even though you never set foot in the U.S. during the year, your paycheck still has FICA and Medicare withholding. You’re treated just like a U.S.-based employee for Social Security purposes.
2. Foreign Employer Abroad
If you work abroad as an employee of a foreign employer, your wages are generally not subject to U.S. Social Security and Medicare tax. Instead, you pay into the foreign country’s social security system (if required). IRS
Example:
You are a U.S. citizen hired locally by a German company in Berlin. You are paid in euros, have a German employment contract, and are covered by the German social security system. In most cases, no U.S. Social Security tax is due on those wages—though you still must consider U.S. income tax rules.
3. Special Case: U.S. Parent Company & Form 2032
Sometimes, a U.S. company has a foreign affiliate that employs U.S. citizens locally. That U.S. parent can elect to have those workers covered under the U.S. Social Security system by filing Form 2032 (Contract Coverage Under Title II of the Social Security Act). IRS
This can be good for employees who want to keep building U.S. credits, but it means FICA gets withheld even though they are technically working for a foreign affiliate.
Rule #2: Self-Employed Expats Usually Still Pay U.S. Social Security
If you are a self-employed U.S. person living abroad (consultant, freelancer, digital nomad, small business owner), the default rule is:
You pay U.S. self-employment tax on your net self-employment income, even if all your clients are foreign and you live entirely outside the U.S. Taxes for Expats+1
Important details:
Rate: 15.3% on net earnings up to the annual Social Security wage base.
FEIE and Foreign Tax Credit: You can use FEIE or foreign tax credits to reduce income tax, but they do not eliminate self-employment tax.
Reporting: You file Schedule SE with your Form 1040.
Real-life example:
Maria, a U.S. citizen, moves to Thailand and works as a self-employed online marketing consultant. She qualifies for the Foreign Earned Income Exclusion and excludes most of her income from U.S. income tax. She’s shocked when her preparer tells her she still owes several thousand dollars in self-employment tax—because FEIE doesn’t erase Social Security obligations.
The only major exception: if a totalization agreement shifts your Social Security coverage to the foreign country (see the next section).
Rule #3: Totalization Agreements Can Prevent Double Social Security Tax
The U.S. has bilateral Social Security agreements, known as totalization agreements, with about 30 countries. Social Security+2Social Security+2
These agreements have two big goals:
Eliminate dual Social Security taxation – so you aren’t forced to pay into both systems on the same income.
Protect and combine benefits – so your work history in both countries can be coordinated for benefit eligibility.
How They Work in Practice
If you are sent abroad temporarily by a U.S. employer to a treaty country, you typically stay under U.S. Social Security for a limited time (often up to 5 years), and are exempt from that country’s system.
If you are hired locally in a treaty country or are self-employed there, you may fall under the foreign system instead and be exempt from U.S. Social Security tax.
The exact rules depend on the specific agreement, your role, and the length of your assignment.
Certificate of Coverage
To prove you are covered by one system and exempt from the other, you usually need a certificate of coverage:
If coverage should be foreign only, you get the certificate from the foreign social security authority.
The IRS notes that to establish your self-employment income is subject only to foreign social security taxes (and exempt from U.S. SE tax), you must request a certificate of coverage from the foreign country’s agency. IRS
Without this certificate, you may end up paying both U.S. and foreign Social Security, which is the exact outcome totalization agreements are designed to avoid.
Example: self-employed expat in a treaty country
John, a U.S. citizen, moves to France and registers as self-employed there. Because the U.S. and France have a totalization agreement, he can be covered exclusively by the French system and exempt from U.S. self-employment tax—provided he obtains and keeps the proper certificate of coverage.
Example: self-employed expat in a non-treaty country
Lisa, a U.S. expat in Thailand (no totalization agreement), is self-employed and pays into the Thai system. She still owes U.S. self-employment tax because there’s no treaty to shift coverage.
How Paying (or Not Paying) Affects Your Future Social Security Benefits
Paying into Social Security is not just a burden; it also buys you future benefits.
To qualify for U.S. retirement benefits, you generally need 40 credits (about 10 years of work under the U.S. system).
Work covered under certain foreign social security systems can be combined with U.S. coverage under totalization agreements to help meet eligibility, though the U.S. benefit is based on your actual U.S.-covered earnings. Greenback Expat Tax Services+2Social Security+2
If you spend decades abroad paying only into a foreign system (with no totalization agreement), you might find that you’ve paid nothing into U.S. Social Security and therefore do not qualify on your own record.
In my opinion, expats who are close to the 40-credit threshold should think very strategically about whether continuing to pay U.S. Social Security tax for a few more years is worth it. For many, securing lifetime retirement and survivor benefits is a powerful reason to stay covered.
Common Expat Scenarios (With Examples)
Here are some typical situations and how Social Security tax usually works:
Remote employee of a U.S. company, living abroad long-term
Status: Employee of an American employer.
Likely result: U.S. FICA and Medicare tax still withheld.
Planning tip: If assigned to a treaty country, FICA may still apply; the main benefit is coordinated benefits later.
Locally hired employee of a foreign company
Status: Foreign employer, foreign social security system.
Likely result: No U.S. Social Security tax; pay into local system.
Planning tip: Consider how this affects your ability to qualify for U.S. benefits.
Self-employed digital nomad with clients worldwide
Status: Self-employed U.S. person.
Likely result: Subject to U.S. self-employment tax, unless protected by a totalization agreement. Taxes for Expats+1
Short-term assignment abroad from U.S. parent company
Status: Temporarily posted to a treaty country by a U.S. employer.
Likely result: Stay under U.S. Social Security for the temporary period; exempt from foreign system based on the agreement.
Married expat with a small side business
Status: Spouse with small self-employment income abroad.
Likely result: Self-employment tax applies unless a totalization agreement places them solely under the foreign system with proper documentation.
Practical Steps for U.S. Expats
Identify your employment status clearly
Are you an employee or self-employed?
Who is your legal employer: U.S. entity, foreign entity, or both?
Check if there is a totalization agreement
Look up your country on the Social Security Administration’s international agreements site. Social Security+2Social Security+2
Determine which system should cover you
Review the specific agreement (if any) and your assignment terms.
For self-employed expats in treaty countries, confirm whether you’re covered by the foreign system only.
Obtain documentation (certificate of coverage)
If you should be under the foreign system only, apply for a certificate of coverage from the foreign authority, as the IRS recommends. IRS
File correctly with the IRS
Use Form 1040 plus Schedule SE if self-employed.
If your income qualifies for FEIE or foreign tax credits, still check whether employment taxes apply. IRS+2IRS+2
Consider professional help
If you’re in a complex situation (dual status, multiple countries, mixed employment types), getting an expat-focused tax professional is often worth the cost.
FAQs: Social Security Tax for U.S. Expats
1. If I use the Foreign Earned Income Exclusion, do I still owe Social Security tax?
Usually yes. FEIE only reduces income tax, not FICA or self-employment tax. If you are an employee of an American employer or self-employed and not covered solely by a foreign system under a totalization agreement, Social Security tax still applies.
2. Can I avoid Social Security tax by forming a foreign corporation?
Simply forming a foreign company does not automatically eliminate U.S. Social Security or self-employment tax. The IRS looks at the substance of the arrangement, where services are performed, and whether you’re truly an employee of that foreign entity. Aggressive structures can backfire.
3. What happens if I pay into both U.S. and foreign Social Security systems?
If you are in a country with a totalization agreement, you can often fix dual coverage by showing a certificate of coverage and having one system refund contributions where appropriate. Without a treaty, you may be stuck paying both.
4. Do Social Security taxes apply to my foreign pension, rental income, or investments?
No. Social Security and self-employment taxes apply to earned income (wages and self-employment), not to passive income like interest, dividends, most rental income, or pension payments. However, those amounts may still be subject to income tax.
5. I’ve lived abroad for years and never paid Social Security. Can I still qualify for benefits?
You may, if you previously earned enough U.S. credits or if a totalization agreement lets you combine coverage periods. But if you have almost no U.S.-covered earnings and no relevant treaty, you might not qualify on your own record.
Sources
Internal Revenue Service – “Social Security and Medicare Tax for U.S. Citizens and Residents Employed Abroad by American Employers” and “Social Security Tax Consequences of Working Abroad.” IRS+1
Internal Revenue Service – “Persons Employed by a Foreign Employer.” IRS
Internal Revenue Service – “Self-Employment Tax for Businesses Abroad” and related expat self-employment guidance. IRS+2Taxes for Expats+2
Social Security Administration – International Programs and Totalization Agreements. Social Security+2Social Security+2
IRS Publication 54 – “Tax Guide for U.S. Citizens and Resident Aliens Abroad.” IRS+2IRS+2
Greenback Expat Tax Services – Social Security and expats overview. Greenback Expat Tax Services+1
IRS / YouTube – “Tax Obligations of U.S. Individuals Living and Working Abroad.” IRS
Video Section: Helpful Videos on Expat Social Security & Taxes
Here are some useful videos you can watch for more context (always double-check current rules):
“Tax Obligations of U.S. Individuals Living and Working Abroad” – IRS
https://www.youtube.com/watch?v=wk4sqzZJoUU IRS“How US Expats Can Maximize Their Social Security Benefits”
https://www.youtube.com/watch?v=hpdXF7SaGig YouTube“Self-Employment Taxes for US Expats: Understanding the Foreign Earned Income Exclusion”
https://www.youtube.com/watch?v=o1A5GJ6622U YouTube“Expat Social Security: How to Maximize Your Benefits”
https://www.youtube.com/watch?v=ipoX7DG5mK0 YouTube“US Expat Taxes for Self-Employed and Small Business Owners” (playlist)
https://www.youtube.com/playlist?list=PLlhUFn4yRNXz5vi5zYM2B3eNpdhWsjJ_3 YouTube
Disclaimer
This article is for general educational purposes only and does not constitute tax, legal, or financial advice. U.S. expat tax and Social Security situations can be complex and highly fact-specific. Always consult with a qualified tax professional or Social Security specialist before making decisions about your own situation.