The Thomson Reuters Foundation's work in Southeast Asia continues to prove that social entrepreneurs are at the forefront of driving change and creating social impact. The legal structure that social entrepreneurs choose for their venture can have a significant bearing on their ability to achieve social change. The guide identifies the advantages and disadvantages of each structure and sets out the relevant registration procedures, regulatory and governance considerations, tax treatment as well as finance and fundraising options – an understanding of all of this is so crucial to ensuring the sustainability, good governance and success of a social venture.