Sustainability reporting is increasing rapidly, nowadays corporations face larger and larger requirements that they work with sustainability and that they present their sustainability work. Both legally required and not legally required expectations and requirements changes how the corporations work and drives the change forward. Previous studies show that the new laws in sustainability reporting often are very difficult, complicated and demanding to follow for the corporations. This study examines how the corporation's sustainability work has changed and which of the legal and non legal requirements has driven the change. This study is abductive with a qualitative approach, this study used a case study of two companies in the automotive industry to be able to answer the research question. The result of this study showed in contrast to the previous literature that the two companies in the case study weren’t highly affected by the legal requirements in sustainability reporting that were introduced. This was mainly because the two already had adopted a great sustainability routine in their work. This finding was the biggest difference from the previous literature and theories. Further it was found that the non legal requirements were the biggest and the most driving changes for the corporations. The non legal requirements were the ones that were driving the change and were the most demanding for the two corporations. This study resulted in that the legal requirements weren't as complicated and difficult for the corporations as the previous literature suggested, instead it was the non legal requirements in the form of stakeholders that was driving the change for the corporations.