any church-related expenses such as funding institutions and foundations or paying ministers. The church tax is only paid by members of the respective church, although the concept of “membership” is far from clear, and it may be asked what right the secular state has to tell the faithful what contribution they should make to their own denomination. People who are not members of a church tax-collecting denomination do not have to pay it. Members of a religious community under public law may formally declare their wish to leave the community to state (not religious) authorities. The obligation to pay church taxes ends once such a declaration has been made. Some communities refuse to administer marriages and burials of (former) members who had declared to leave it. The money flow of state and churches is distinct at all levels of the procedures. The church tax is not meant to be a way for the state to directly support churches, but since expenses for church tax are fully deductible (as are voluntary expenses for the Church, for charity or a bundle of other privileged aims) in fact such support occurs on a somewhat large scale. The effort of collecting itself, done by the State, is entirely paid for by the Churches with a part of the tax income. The church tax is historically rooted in the pre-Christian Germanic custom where the chief of the tribe was directly responsible for the maintenance of priests and religious groups. During the Christianization of Western Europe, this custom was adopted by the Christian churches (Arian and Catholic) in the concept of "Eigenkirchen" (churches owned by the landlord) which stood in strong contrast to the central church organization of the Roman Catholic Church. Despite the resulting medieval conflict between emperor and pope, the concept of church maintenance by the ruler remained the accepted custom in most Western European countries. In Reformation times, the local princes in Germany became officially heads of the church in Protestant areas and were legally responsible for the maintenance of churches. Not until the 19th century, were the finances of churches and state regulated to a point where the churches became financially independent. At this point, the church tax was introduced to replace the state benefits the churches had obtained previously. The church tax was reaffirmed in Article 13 of the Reichskonkordat between Nazi Germany and the Vatican, where it is understood that