Must all contracts be in writing? No, not all contracts have to be in writing. However, the law does require that contracts for the sale of land and long-term leases be in writing. Information is power. Share it!FacebookTwitterGoogle+PinterestRelated Topics What is a contract? Can I make a contract before turning 18? What are some of the advantages of a written contract? What are some of the disadvantages of written contracts? What are some general rules to follow when asked to sign a contract?