For you tithe mint and rue and all manner of herbs, and pass by justice and the love of God. These you ought to have done, without leaving the others undone . Jesus was saying that giving is not just a matter of obligation but of the heart. The New Testament does not Specify a Percentage . It was a holy tax.
Some believers stick rigidly with the tithe.
Others see the tithe as legalism and realize that under grace they are no longer bound to the law. Yet, this often becomes an excuse for poor stewardship. Though the tithe is a good rule of thumb, you should start where you are. I am afraid the only safe rule is to give more than we can spare . How much you give is between you and God.