In order to eliminate the double taxation of Social Security and Medicare taxes, the United States has entered into international agreements (known as the "taben-up agreement") with 25 countries. Aggregation agreements exempt salaries from Federal Insurance Contributions Act (FICA) taxes, including Social Security taxes and Medicare taxes, when a person`s income is subject to taxes or contributions for similar purposes under a foreign country`s social security system. A similar exemption is underway for taxes under the Self-Employment Contributions Act (SECA). The agreements allow SSA to add up U.S. and foreign coverage credits only if the worker has at least six-quarters of U.S. coverage. Similarly, a person may require minimum coverage under the foreign system for having attributed U.S. coverage to meeting foreign benefit eligibility requirements. However, please do not call these numbers if you wish to inquire about an individual entitlement to benefits. The goal of all U.S. totalization agreements is to eliminate dual social security and tax coverage while maintaining coverage for as many workers as possible under the regime of the country where they probably have the greatest attachment, both at work and after retirement. .