Brendan: It is possible, with consent of the bishop (or his delegate).
I have also heard this happening for senior citizens, when a civil marriage would result in a loss of pension benefits that the senior needed to live on. A Sacramental marriage is performed without a civil marriage.
Phemie: I doubt that. The Church would be suborning fraud against the government. It may not seem fair but decreasing someone's benefits when they marry doesn't violate natural law. Two may not live as cheaply as one, but two together can live more cheaply than two apart.
Brendan: It is not fraud against the government because the government does not make the reception of a Sacrament a condition of benefits. Yes the government will recognize the priest as a legitimate witness to the civil contract of marriage, but that did not happen and no one is claiming that it did.
Phemie: It is fraud because the only reason for a religious only wedding is to not lose benefits and defraud the State
Brendan: In some countries, such as France, only civil weddings are recognized, so a couple will undertake both a church wedding, followed by a Justice of the Peace wedding.
Phemie: No, they must first marry civilly and then they can marry in the Church. That's the law and the Church follows it because it is not unjust.
Brendan: It the case of the civil authority, France does not require that the civil ceremony happen first, in fact the civil authorities generally couldn't care less if you had a religious ceremony first, second or not at all. Are you somehow referring to Canon Law?
Phemie: No, French law. The Church in France will only marry those who are already civilly married. The priest will require a marriage certificate before he proceeds with the religious ceremony.