In today's competitive environment it is essential to be ahead of the rest or, put differently, to be ahead of the first. In the past years in Kosovo, there has been a development of banking and telecom industry along with an increase in competitiveness and greater service offerings from these companies. With increased marketing communication and expenditure as well as an increased sales force in order to better serve the client, there is an ample need to study the interrelationship of these departments affecting business performance. This research studies the relationship between marketing and sales departments in the banking and telecom industry in Kosovo and the impact of this relationship on business performance.