The Judaic law of tithing is no longer binding on the Christian, however, the Precepts of the Church are binding upon all Catholic. Here they are, with Precept 5 highlighted for your edification:
Precepts of the Catholic Church
Precepts of the Church are binding obligations for Catholics. They are expectations set up by the Catholic Church. Each of the seven precepts of the Church will be reviewed each week through the summer months.
The First Precept of the Church:
You shall attend Mass on Sundays and Holy days of Obligation. We are to keep holy the day of the Lord’s Resurrection by participating at Mass on Sundays and Holy days.
The Second Precept of the Church:
Catholics are to lead a sacramental life by receiving Holy Communion frequently and the Sacrament of Reconciliation regularly. Catholics must confess serious or mortal sins before they are able to receive Holy Communion.
The Third Precept of the Church:
Catholics are to receive Holy Communion at least once a year. This should be done especially between the first Sunday of Lent and Trinity Sunday.
The Fourth Precept of the Church:
Catholics are to observe the marriage laws of the church.
**The Fifth Precept of the Church:
Catholics have a responsibility to financially support their own parish community, their parish priests, the world-wide Catholic Church, and the Holy Father. **
The Sixth Precept of the Church:
Catholics are to observe the prescribed days of fasting and penance.
The Seventh Precept of the Church:
Catholics are to join in the missionary spirit and apostolate of the Catholic Church.
Note that there is no percentage or mandatory amount given, only that each Catholic has an obligation to support the Church. If you have a gut feeling that you aren’t doing enough, you probably aren’t.