Data localisation has increased the security of the data generated within the boundaries of a specific economy where the data was generated. Data is huge mass data generated by various sectors and the safety of confidential data generated is a priority for any nation. The aim of the research is to study the data localisation effect, compare its effect on the GDP of various countries, and to normalise and predict the GDP after data localisation is implemented in a particular country. The outcome of the paper is that Nigeria and Vietnam have greater GDP compared to India. From the study, it is found that out of nine countries taken for the study, eight countries have data localisation effect on its GDP, while one has no effect even after implementation.