A worker who is exempt from U.S. or Portuguese social security coverage under the
agreement must obtain a certificate of coverage from the country where he or she will
be covered in order to document the exemption. A certificate of coverage issued by
one country serves as proof that the worker named on the certificate is:
subject to the laws of the country issuing the certificate and
exempt from social security coverage and contributions on the same earnings in the
issues the certificates of U.S. coverage.
The Portuguese social security regional center:
to which the worker contributes issues certificates of Portuguese coverage.