Which phrase signifies being financially stable?

Being financially stable can be signified by the phrase "to be in the black." This expression refers to a situation where an individual or organization has positive financial health, meaning they have more income than expenses. In accounting terms, being "in the black" indicates that a person has published their financial statements showing that they are making a profit and can meet their financial obligations comfortably.

The other phrases have different meanings in financial contexts or are unrelated to financial stability. "To be in the red" indicates a deficit or loss, signifying financial struggle. "To keep your chin up" is an idiomatic expression used to encourage someone to stay positive during difficult times, but it doesn't relate to financial status. "To keep track of" means to monitor or manage something but does not specifically address financial stability.