You are not required to sign a termination letter. In most cases where an employee has been wrongfully terminated, it is wise for him or her not to sign a termination letter. The letter may make it more difficult to prove wrongful termination in the future if you acknowledged the details of the letter, agreed to the facts purported by the letter or agreed to legal terms which often have you waive legal claims under state and federal law. If you are given a termination letter to sign along with a severance offer, then contact a severance attorney before you agree to either.