Self-employed abroad: why you can owe US tax on income you excluded

The foreign earned income exclusion can wipe out your US income tax, but it doesn't lift a finger for self-employment tax.

The short version

• If your net self-employment earnings are $400 or more, you owe US self-employment (SE) tax, wherever you live [1][2].
• The IRS is direct: you pay SE tax "on all your net profit, even if you claimed the foreign earned income exclusion" [1].
• SE tax is Social Security (12.4%) plus Medicare (2.9%) [3]. The Social Security part stops at $176,100 of earnings for 2025 and $184,500 for 2026 [3].
• If you live in one of the 31 countries with a US totalization agreement, you may pay into only one system. You prove it with a certificate of coverage [4].
• In a country with no agreement, such as Mexico or Thailand, you may pay into both.

Why the exclusion doesn't help

The foreign earned income exclusion on Form 2555 lets you exclude up to $130,000 of foreign earned income for 2025 and $132,900 for 2026 [5]. It reduces income tax. Self-employment tax is a separate tax that funds Social Security and Medicare, figured on Schedule SE.

The Schedule SE instructions say self-employment income earned abroad "can't be reduced by the foreign earned income exclusion" when you compute SE tax [2]. Foreign tax credits work against your income tax too, not against SE tax. So a freelancer in Lisbon earning USD 60,000 could have zero US income tax after the exclusion and still owe several thousand dollars of SE tax.

That surprises employees who went freelance abroad, because back in the States an employer paid half of the 15.3% and withheld the rest from their paycheck. When you work for yourself, you're the boss and the employee, so you pay both halves.

How the tax is figured

On Schedule SE, net profit from Schedule C (or your share of partnership income) is multiplied by 92.35% to get net earnings from self-employment. The tax is then:

The Additional Medicare Tax is reported on Form 8959 [2]. You can deduct half of your SE tax as an adjustment to income, but if your income tax is already zero because of the exclusion, that deduction won't save you a dime.

A worked example (2026)

A US citizen freelances as a designer in Lisbon, with a net profit of USD 60,000 in 2026:

1. Net earnings from self-employment: USD 60,000 x 92.35% = USD 55,410.
2. SE tax: USD 55,410 x 15.3% = about USD 8,480.
3. Income tax: likely zero, if she qualifies for the exclusion.

In this case Portugal has a US agreement [4], so the picture changes. Stay tuned.

Totalization agreements: the main way out

The US has Social Security agreements, often called totalization agreements, with 31 countries. Under them, "dual coverage and dual contributions (taxes) for the same work are eliminated" [1]. The SSA lists them with the date each came into force [4]:

Mexico, Thailand, the Philippines, Costa Rica, Colombia and the UAE are not on the list [4].

Which country gets you?

For employees, the rules turn on who sends you where. For the self-employed, the SSA says some agreements "eliminate dual coverage of self-employment by assigning coverage to the worker's country of residence," while others let you temporarily move your self-employment between the two countries [4]. Italy is a special case: coverage is based mainly on nationality, so a self-employed US citizen in Italy generally stays under US Social Security [4]. Each agreement has its own page on the SSA site, and that's where you confirm the rule for your country. Don't take a friend's word for it; the details really do vary.

How to claim the exemption

If your agreement puts you in the foreign system:

1. Register and pay in your host country. You're now paying into its social security system as a self-employed person.
2. Get a certificate of coverage from the foreign agency. The Schedule SE instructions say to get one from the foreign country, and if it won't issue one, to ask the SSA [2].
3. Don't complete Schedule SE. Instead attach a copy of the certificate or statement to your return, check box 3 on Schedule 2 (Form 1040), line 4, and enter "EAS" [2].
4. Repeat every year. The IRS says to attach a photocopy to your Form 1040 each year you're exempt [1]. Set a reminder, the way you would for any annual chore.

If your agreement puts you in the US system instead, you pay SE tax as usual and can use a US certificate to stay out of the foreign system. Self-employed people request it from the SSA by mail, giving their country of residence and the nature of their work [4].

When you're in a country without an agreement

Here you may owe both US SE tax and the host country's social contributions on the same income. There's no treaty fix, and yes, it stings. A few practical points:

• The US credits still count. Paying SE tax builds US Social Security credits and future benefits, which may be worth more to you than the foreign system if you plan to retire stateside.
• Business structure matters. Some freelancers abroad form a local company and pay themselves a salary, because a foreign employer's wages aren't subject to US SE tax in the same way. This can create other US reporting, such as Form 5471, and should be planned with a US expat tax preparer and a local accountant.
• Pay as you go. Uncle Sam expects estimated tax payments during the year on Form 1040-ES. SE tax counts toward the amount due.

Common mistakes

• Assuming the exclusion covers everything. It covers income tax only [1][2].
• Paying into both systems in an agreement country. Without a certificate on file, you can end up paying twice for years.
• Forgetting the $400 threshold. Even a small side business triggers Schedule SE at $400 of net earnings [2].
• Not attaching the certificate. The exemption has to be shown on each year's return [1][2].
• Mixing up employees and the self-employed. The 5-year rule for employees sent abroad is an employer rule; the SSA doesn't present it as applying to the self-employed [4].

Sources

1. IRS, Self-employment tax for businesses abroad
2. IRS, Instructions for Schedule SE (Form 1040) (2026)
3. SSA, Contribution and benefit base
4. SSA, U.S. international Social Security agreements
5. IRS, Figuring the foreign earned income exclusion

Keep reading

• Tax treaties and totalization agreements
• Foreign earned income exclusion vs foreign tax credit
• Social Security abroad: payments and restrictions
• Filing a US tax return from abroad