Investor-State Dispute Settlement (ISDS) is a concept and a mechanism of public international law that allows a foreign investor to bring a claim directly against the host state where they have made an investment, typically for an alleged breach of an international investment agreement. The mechanism most often takes the form of international arbitration, bypassing the host state's domestic courts.
The system emerged with the development of Bilateral Investment Treaties (BITs) in the mid-twentieth century, with the UK's earliest BIT containing ISDS provisions dating to 1975 with Egypt, and Germany's to 1962 with Turkey. The core problem ISDS was created to solve was the political risk to foreign direct investment (FDI), ensuring that investors would be protected from arbitrary actions like expropriation or discriminatory treatment, especially in countries where the judiciary was not fully independent. The 1966 Convention on the Settlement of Investment Disputes between States and Nationals of Other States (ICSID Convention), formed under the World Bank, was a key development to encourage private investment in developing countries.
The mechanism works by granting the investor the right to initiate arbitration proceedings under international law, often under the rules of institutions like the International Centre for Settlement of Investment Disputes (ICSID) or the United Nations Commission on International Trade Law (UNCITRAL). The legal basis for a claim is found in an international investment agreement, such as a BIT or a Free Trade Agreement (FTA) with an investment chapter. The arbitral tribunal, typically composed of three arbitrators, determines if the state has violated treaty obligations, such as the requirement for Fair and Equitable Treatment (FET) or protection against indirect expropriation, and can award monetary damages to the investor.
In India, the ISDS landscape has changed significantly following adverse arbitral awards, such as the White Industries Australia Limited v. The Republic of India (UNCITRAL, 2011) case, where the tribunal ruled against India for failing to provide an effective domestic remedy. In response, India terminated around 75 BITs in 2016 and 2017 and adopted a more restrictive 2016 Model BIT. This model introduced a mandatory requirement for the exhaustion of local remedies for five years before an investor could commence international arbitration. However, recent treaties show a shift: the 2024 India–UAE BIT retains ISDS but reduces the local remedies waiting period to three years and protects portfolio investments, signaling a move towards a "more investor-friendly" revised Model BIT. Conversely, India's new trade agreements with the European Free Trade Association (EFTA), Oman, and the UK exclude investor-State arbitration entirely, channeling disputes through State-to-State mechanisms.