The U.S.-United Kingdom agreement requires each country to issue certificate of coverage forms for workers who, without the agreement, would have to pay social security taxes to both countries on the same earnings. The certificate serves as proof that the worker named on the certificate is:

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  subject to the social security taxation and coverage laws of the country issuing the certificate; and

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  exempt from social security coverage and contributions on the same earnings in the other country.

Advise inquirers that when writing to obtain a certificate of coverage, they should provide the following information:

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  full name;

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  Social Security number (U.S. number for U.S. certificate and United Kingdom number for United Kingdom certificate);

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  country of citizenship;

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  date and place of birth;

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  country of permanent residence;

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  name and address of employer in both countries (if self-employed, address of trade or business in both countries);

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  date and place of hire by sending company, if employed; and

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  beginning date and ending date (if known) of employment or self-employment in the other country.