Tax stands for the share that must be given up for belonging to something larger. Tradition reads it as duty, fairness and resentment over what is taken.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.