Letter Of The Law Puns

Doing a crossword with my father in law and mother in law. He told me that he completed The Times crossword (which is apparently one of the hardest crosswords) the other day all except one clue. Mother in law says "go on then darling tell me the clue I bet I'll work it out" He says the clue is "heavily laden postman" She says "how many letters" He says "hundreds and hundreds I should think" Dead

Using this image, can you give me a good catch phrase that is punny using around 7 letters or fewer, and having something to do with taxes, finance, helping people. The t-shirt is for a volunteer group at a law school that helps indigent people file taxes and participates in community education and advocacy in the area of financial literacy.

Thanks for all of your help!