Persons to whom this Regulation applies shall be subject to the legislation of a single Member State only. Such legislation shall be determined in accordance with this Title.

For the purposes of this Title, persons receiving cash benefits because or as a consequence of their activity as an employed or self-employed person shall be considered to be pursuing the said activity. This shall not apply to invalidity, old-age or survivors' pensions or to pensions in respect of accidents at work or occupational diseases or to sickness benefits in cash covering treatment for an unlimited period.

For the purposes of this Title, an activity as an employed or self-employed person normally pursued on board a vessel at sea flying the flag of a Member State shall be deemed to be an activity pursued in the said Member State. However, a person employed on board a vessel flying the flag of a Member State and remunerated for such activity by an undertaking or a person whose registered office or place of business is in another Member State shall be subject to the legislation of the latter Member State if he/she resides in that State. The undertaking or person paying the remuneration shall be considered as the employer for the purposes of the said legislation.

A person who pursues an activity as an employed person in a Member State on behalf of an employer which normally carries out its activities there and who is posted by that employer to another Member State to perform work on that employer's behalf shall continue to be subject to the legislation of the first Member State, provided that the anticipated duration of such work does not exceed 24 months and that he/she is not sent to replace another person.

A person who normally pursues an activity as a self-employed person in a Member State who goes to pursue a similar activity in another Member State shall continue to be subject to the legislation of the first Member State, provided that the anticipated duration of such activity does not exceed 24 months.

A person who normally pursues an activity as an employed person and an activity as a self-employed person in different Member States shall be subject to the legislation of the Member State in which he/she pursues an activity as an employed person or, if he/she pursues such an activity in two or more Member States, to the legislation determined in accordance with paragraph 1.

A person who is employed as a civil servant by one Member State and who pursues an activity as an employed person and/or as a self-employed person in one or more other Member States shall be subject to the legislation of the Member State to which the administration employing him/her is subject.

Persons referred to in paragraphs 1 to 4 shall be treated, for the purposes of the legislation determined in accordance with these provisions, as though they were pursuing all their activities as employed or self-employed persons and were receiving all their income in the Member State concerned.

Articles 11 to 13 shall not apply to voluntary insurance or to optional continued insurance unless, in respect of one of the branches referred to in Article 3(1), only a voluntary scheme of insurance exists in a Member State.

Where, by virtue of the legislation of a Member State, the person concerned is subject to compulsory insurance in that Member State, he/she may not be subject to a voluntary insurance scheme or an optional continued insurance scheme in another Member State. In all other cases in which, for a given branch, there is a choice between several voluntary insurance schemes or optional continued insurance schemes, the person concerned shall join only the scheme of his/her choice.

However, in respect of invalidity, old age and survivors' benefits, the person concerned may join the voluntary or optional continued insurance scheme of a Member State, even if he/she is compulsorily subject to the legislation of another Member State, provided that he/she has been subject, at some stage in his/her career, to the legislation of the first Member State because or as a consequence of an activity as an employed or self-employed person and if such overlapping is explicitly or implicitly allowed under the legislation of the first Member State.

Where the legislation of a Member State makes admission to voluntary insurance or optional continued insurance conditional upon residence in that Member State or upon previous activity as an employed or self-employed person, Article 5(b) shall apply only to persons who have been subject, at some earlier stage, to the legislation of that Member State on the basis of an activity as an employed or self-employed person.

Two or more Member States, the competent authorities of these Member States or the bodies designated by these authorities may by common agreement provide for exceptions to Articles 11 to 15 in the interest of certain persons or categories of persons.

A person who receives a pension or pensions under the legislation of one or more Member States and who resides in another Member State may at his/her request be exempted from application of the legislation of the latter State provided that he/she is not subject to that legislation on account of pursuing an activity as an employed or self-employed person.