Social Security Totalization Agreement
A bilateral agreement between the US and a foreign country that prevents double Social Security contribution on the same wages and may allow combining work credits across countries to qualify for benefits.
Detailed Explanation
The US has totalization agreements with roughly 30 countries. The agreement typically uses an assignment-duration rule: a US worker temporarily assigned abroad (typically up to 5 years) continues paying US Social Security and is exempt from foreign social security; a foreign worker assigned to the US does the reverse. A Certificate of Coverage (issued by the home country social security agency) proves the exemption to the host country employer. Self-employed cross-border workers also benefit. Combining work credits can help qualify for benefits even when neither country alone would qualify the person.
Key Points
- Prevents double Social Security taxation of the same wages across two countries.
- The US has agreements with roughly 30 countries.
- A temporary assignment (typically up to 5 years) keeps the worker in the home-country system only.
- A Certificate of Coverage proves the exemption to the host-country employer or tax authority.
- Can combine work credits across countries to qualify for benefits neither would grant alone.
Practical Example
A US company sends an employee to Germany for a 3-year assignment. Without a totalization agreement, both US and German social security could apply to her wages. Under the US-Germany agreement she stays in the US system, obtains a Certificate of Coverage, and is exempt from German social security contributions for the assignment.
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Learn about International TaxationRelated Terms
FICA Tax
The Federal Insurance Contributions Act payroll tax funding Social Security and Medicare, withheld from wages and matched by the employer.
Self-Employment Tax
The Social Security and Medicare tax (15.3% combined) paid by self-employed taxpayers on their net earnings from self-employment.
Tax Treaty
A bilateral agreement between the United States and a foreign country that allocates taxing rights and provides benefits to reduce or eliminate double taxation on cross-border income.
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