The Bank Account of SpongeBob SquarePants is a book that only appears in the episode "The Card."
It is a light brown book and the title is in a darker shade of brown. Underneath, the cover has pictures of yellow and green flowers and pink bunnies on it. SpongeBob was embarrassed about this, saying that he actually wanted kittens on it.
Role in the episode
SpongeBob took out this book when he was asked by Quincy so that he can purchase Mermaid Man and Barnacle Boy cards. Quincy was able to take out money for SpongeBob but SpongeBob kept rejecting dollars due to their condition much to the annoyance of Quincy and the other customers. SpongeBob was then eventually kicked out of the bank and it can be assumed that he took his bank account book back with him.
The title on the book has some words misspelled: "Sponge Bob" should be "SpongeBob," and the "P" in "Squarepants" should be capitalized.