When people plan a move abroad they obsess over income tax and forget social security — the payroll-type contributions that fund pensions and disability benefits. Without coordination, you can end up paying into two systems at once. The fix is a totalization agreement.
What a totalization agreement does
A totalization agreement is a bilateral treaty — separate from an income tax treaty — that coordinates two countries’ social-security systems. It does two jobs:
- Avoids double contributions. It assigns your social-security liability to one country (usually where you work, or your home country for a temporary posting), so you don’t pay both.
- Combines credits. It lets you “totalize” work credits earned in each country to qualify for a pension you’d otherwise miss by being short in either alone.
It does not touch income tax. That is handled by the income tax treaty and the Foreign Tax Credit.
Who has one with the US — and who doesn’t
The US has roughly 30 totalization agreements. The split matters because the gaps are exactly the popular expat destinations.
| Has US totalization | No US totalization |
|---|---|
| Germany, France, Spain, Italy, Portugal, Ireland | UAE, Qatar, Saudi Arabia (Gulf states) |
| UK, Switzerland, Netherlands, Sweden, Norway, Denmark | Thailand, Malaysia, Singapore, Hong Kong |
| Canada, Australia, Japan, South Korea | Mexico, Cyprus, Malta, India, New Zealand |
| Greece, Czech Republic, Poland, Chile, Brazil, Uruguay | Andorra, Monaco, Georgia, Croatia |
Status as of mid-2026, per the SSA totalization list. Romania’s agreement was signed and enters into force 1 September 2026. Verify the current status on the SSA site. You can also see each country’s status on its profile page.
Why the gaps bite
Self-employed US citizens are the most exposed. A US freelancer in Portugal (totalization: yes) pays into one system. The same freelancer in Dubai or Thailand (no totalization) can owe US self-employment tax of about 15% on top of any local contributions — because there is no agreement to assign liability to one side. Note that several no-totalization countries levy no employee social charges at all, which softens the blow for employees but not for the US self-employment tax.
What to check before you move
- Will you keep paying into the foreign system? Employees usually do; check whether a totalization agreement exempts you.
- Are you self-employed? Without an agreement, expect to keep paying US self-employment tax.
- Are you near a pension milestone? An agreement may let you combine credits to qualify.
- Confirm the live status on the SSA site — agreements are added (and dates shift) over time.
A totalization agreement is easy to overlook but can be worth thousands a year. Pair this with the FEIE vs FTC guide and the country profiles — and, as always, confirm with a cross-border adviser.