I found this on the subject:
Can. 1262 The faithful are to give support to the Church by responding to appeals and according to the norms issued by the conference of bishops.
Can. 222 §1. The Christian faithful are obliged to assist with the needs of the Church so that the Church has what is necessary for divine worship, for the works of the apostolate and of charity, and for the decent support of ministers.
The Catechism puts this obligation in this way:
Code:
CCC 2043 The faithful also have the duty of providing for the material needs of the Church, each according to his abilities.