You are an admirable young man to consider “tithing”. God will surely use your generous spirit to His purpose! God Bless you.
Every parish and every diocese and the universal church is accountable for how it spends its funds. Your local parish is required by Canon Law to have a Finance Council [also called Administrative Council or some other name] to porvide for the financial administration of parish funds - what is called “transparency, accountability and fiscal responsibilty” Ask your parish priest for an accounting…
Now to the requirement that 65% of parish funds be applied to charitable causes…
Do you parents use 65% of their income [operating funds] to benefit charitable causes?
What is the level of support that they provide to the parish? Support is more than just financial…time, talent and treasure are expected.
That said, how should one allocate the gifts from God to the world Tithing 10% is a good placce to start. Tithing was expected of the Jewish people who were given the Law and the Prophets. They were provided manna frm heaven and ransomed form savery in Egypt. How much more have we [as Christians] been given? The True Bread from heaven, the Blood of Christ fromthe cross, ransomed and saved y Christs atoning sacrifice?
So most catholics who practice this ‘tithe’ begin with parish support of 5-6%. It is your parish where you receive the Eucharist each week, Baptisms, Confirmations, Marriages Reconcilliation. The parish provides religous education and houses the priest [who provides the Sacramens including the Annointing] We should want our communal home to be maintained, welcoming, and available.
The other 4-5% should be contributed to other charitable causes. This can be through the Second collections for various causes [homelessness, pro-life causes, food banks, missions, etc.] that are a part of the church’s mission and through other charitable organizations. Be sure to research charitable organizations and donate onlly to those whos administrative costs are 5% or less of every dollar donated. This ensures that your contribution goes to the purpose for which it was solicited. Some charities have operating costs of 95%, which means that only 5 cents goes to the charitabe cause!