In June 2014, the Human Rights Council passed a resolution establishing an inter-governmental working group to discuss a legally binding instrument relating to transnational corporations and other business enterprises. In this article, I outline four arguments for why such an instrument is desirable. Identifying the purpose of such a treaty is crucial in outlining a vision of what it should seek to achieve and in determining its content. The arguments indicate that a treaty is necessary to provide legal solutions to cure serious lacunae and ambiguities in the current framework of international law which have a serious negative impact upon the rights of individuals affected by corporate activities. The emphasis throughout is upon why a bindi...