Do U.S. self-employed expats have to pay self-employment tax if the country has no totalization agreement?

Yes. Without a totalization agreement between the U.S. and your country of residence, you owe the full 15.3% U.S. self-employment tax on net earnings of $400 or more, even if you are also paying into the foreign social security system. This creates a double social-security burden that can approach 30% combined.

The 15.3% U.S. SE tax breaks down as:

• 12.4% Social Security (on earnings up to the annual Social Security wage base)
• 2.9% Medicare (uncapped)
• Additional 0.9% Medicare surtax on earnings above $200,000 (single) or $250,000 (MFJ)

You can deduct half the SE tax as an adjustment to income, which partially softens the hit.

Countries with totalization agreements (current list; verify at SSA.gov): Australia, Austria, Belgium, Brazil, Canada, Chile, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Japan, Luxembourg, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, South Korea, Spain, Sweden, Switzerland, United Kingdom, and Uruguay.

Countries without a U.S. totalization agreement where expats frequently live include the UAE, Singapore, Hong Kong, Thailand, Mexico, Colombia, Costa Rica, Panama, Vietnam, Indonesia, Malaysia, Taiwan, New Zealand, and most of Africa.

Workarounds when no agreement exists:

• Structure your activity through a foreign corporation that employs you (paying a reasonable salary may or may not trigger U.S. tax depending on CFC/GILTI rules)
• Incorporate a U.S. C-corp and pay yourself W-2 wages (FICA applies, but employer and employee portions are split formally)
• Accept the double-tax cost if structure changes are not practical

For strategy on reducing SE tax abroad, see our Totalization Agreements Guide.