Although the Church teaches that offering some form of material support to the Church is obligatory for all Catholic adults who are able to do so, it doesn’t specify what percent of one’s income should be given. Remember, tithing (referring to 10%) was an Old Testament obligation that was incumbent on the Jews under the Law of Moses.
Christians are dispensed from the obligation of tithing ten percent of their incomes, but not from the obligation to help the Church.
In speaking about tithing and what we should give to the Church, we often forget that everything we have already belongs to God. Our money and possessions are not ours but His. All that we have is ours only because He allows us to have it.
If we in the world today were to place God first in our lives, there would be no question or problem about tithes because our hearts would be filled with charity and we would give to and support the Church in the best way that we were able to.
To paraphrase: God doesn’t demand a fixed amount of money from us; he wants us to give from the heart.
If people are forced by their church to give a certain percent of their income, that’s extortion. If they give freely and cheerfully the amount they are able, that’s a gift. (10:11)