We have only once source of income. Am I being selfish by tithing on the net instead of gross? I know it may sound like splitting hairs and I want to please God most of all. He has ALWAYS taken care of us, but we have no money left at the end of the month.
It all boils down to this.
Give, and it will be given to you. A good measure, pressed down, shaken together and running over, will be poured into your lap. For with the measure you use, it will be measured to you (Luke 6:38)
You decide what you want to give and the Lord will respond accordingly. No guilt, no splitting hairs, no fancy interpretations, just cause and effect. By the way, you shouldn’t worry about not having some money left at the end of the month. Many people still have some month left at the end of the money. The Lord said if you first seek His kingdom and His righteousness He would see to your needs (Matt. 6:31-33). It sounds like He’s doing that for you.