Investor-State Dispute Settlement (ISDS) is a legal mechanism that grants foreign investors the right to initiate international arbitration proceedings directly against a host state for alleged breaches of investment protections. It is a provision typically embedded within Bilateral Investment Treaties (BITs) or Free Trade Agreements (FTAs).
The concept emerged in the post-World War II era, as developed nations sought to protect their Foreign Direct Investments (FDI) in developing countries from risks like arbitrary expropriation. The first BIT, signed between Pakistan and Germany on November 25, 1959, did not include an ISDS clause. The first investment treaty to include a clause allowing a private investor to sue a state is generally considered to be the 1969 Chad–Italy BIT. The mechanism was created to provide a neutral forum, outside of potentially biased domestic courts, to ensure the host state's treaty obligations were enforceable.
The mechanism works through international arbitration: if an investor claims a state action—such as a new regulation or policy change—violates treaty-guaranteed protections like "fair and equitable treatment" or protection against expropriation, they can initiate a claim. The dispute is heard by an ad hoc tribunal, often administered by institutions like the International Centre for Settlement of Investment Disputes (ICSID) or the United Nations Commission on International Trade Law (UNCITRAL). The tribunal's binding decision can award monetary compensation to the investor.
Recently, the system has undergone significant reform. The European Union (EU) is replacing the ad hoc arbitration model with the Investment Court System (ICS), which features a permanent court with appointed judges. India, in response to multiple arbitration cases, introduced the 2016 Model Bilateral Investment Treaty (BIT). This new model is more restrictive, notably excluding the Most-Favoured-Nation (MFN) clause and requiring investors to exhaust all local remedies for five years before initiating international arbitration. Furthermore, the 2016 Model BIT replaced the broad Fair and Equitable Treatment (FET) standard with a narrower provision that only covers specific violations of customary international law, such as denial of justice.