For the United States, the agreement applies to Social Security taxes under the RSDHI
            program (i.e., FICA taxes for employment and SECA taxes for self-employment, including
            the Medicare portion). Thus, if an individual is exempt from U.S. Social Security
            coverage under this agreement, neither the employee or employer share of the FICA
            tax nor the SECA tax, in the case of a self-employed person, has to be paid.