Send a US employee to work in France without filing the right paperwork, and you’ll pay social security in both countries — roughly 22% to France’s URSSAF plus 7.65% to the US IRS. That’s nearly 30% of gross salary going to duplicate coverage. Totalization agreements exist to prevent exactly this.
A totalization agreement is a bilateral treaty between two countries that eliminates double social security taxation. The US has agreements with about 30 countries, including the UK, Germany, France, Canada, Japan, and South Korea. The EU operates its own coordination framework (EC Regulation 883/2004) that handles social security across all member states. These agreements typically cover assignments up to 5 years — after that, the worker transitions to the host country’s system.
The mechanics work through Certificates of Coverage. A US employer sends someone to Germany; they file Form USA/D-101 with the US Social Security Administration. Once approved, the employee stays in the US system and is exempt from German social security contributions. Without this certificate, the German employer (or EOR) must withhold German statutory benefits contributions, and the employee still owes US FICA. Both systems collect. Neither refunds automatically.
Countries without totalization agreements create genuine cost problems. China, India, and Brazil — three of the largest markets for international expansion — have no agreement with the US. An American working in India through an EOR will contribute to India’s Provident Fund and still owe US Social Security on their worldwide income.
Why It Matters for EOR
For companies using an EOR, totalization agreements can dramatically affect cost calculations. If your US-based company hires a US citizen to work in France through an EOR, the totalization agreement may exempt them from French social security for up to 5 years — reducing employer costs by roughly 40% of gross salary. But the exemption requires proactive filing. Many EOR providers don’t handle this automatically.
Ask your EOR specifically: do you manage Certificate of Coverage filings? Remote and a few other providers with owned entities in major markets are more likely to handle this natively. Providers using partner networks often punt to a third-party tax advisor — which adds $2,000–$5,000 per filing and introduces delays.
If you’re comparing EOR costs across providers, factor in whether they manage totalization paperwork. The cheapest per-employee fee means nothing if you’re paying duplicate social security contributions because nobody filed a certificate.
For the full list of US totalization agreements and filing procedures, see the US Social Security Administration’s international agreements page.
For practical use of this concept, see EOR vs PEO explained and remote jobs by country.
Further Reading
- Hiring in the United States: social security treaties and Certificate of Coverage — The US has totalization agreements with about 30 countries, each with specific filing requirements for exemptions.
- Hiring in Canada: CPP coordination and bilateral social security rules — Canada’s CPP system coordinates with multiple treaty partners, affecting employer contribution calculations.
- EOR comparisons
- Read Deel review
- EOR vs PEO explained
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