A Termination With Cause letter is a formal business document used to inform an employee that their position is being terminated due to a violation of company policy or due to unsatisfactory performance. The letter should be clear, concise, and unambiguous in explaining why the termination is taking place. It should also serve as a warning that similar behavior in the future could result in further disciplinary action. This type of measure should only be taken after other options, such as counseling and warnings, have not been successful in addressing the issue.