Collective Action Clauses and Holdout Creditors

When a country cannot pay its debts, it needs bondholders to agree to a restructuring — usually accepting less money, later, or both. But a bond is held by thousands of scattered investors, and unlike corporate bankruptcy, there is no international court that can force a sovereign restructuring on everyone. A collective action clause (CAC) is the contractual fix: it lets a supermajority of bondholders (commonly 75%) approve a restructuring that then binds all bondholders in that bond, including the ones who voted no.

Without a CAC, a single investor could refuse the deal, keep the original bond's full face value claim, and later sue for full repayment plus interest — a strategy known as being a holdout creditor. Holdouts don't need many bonds to cause damage: they only need patience and a legal system willing to enforce sovereign debt contracts, since many sovereign bonds are issued under New York or English law specifically to make them enforceable in court.

The most famous case is Argentina, where a small group of holdout funds refused the 2005 and 2010 restructurings, sued in New York, and eventually won a ruling blocking Argentina from paying any other bondholders until the holdouts were paid in full — a standoff that took until 2016 to resolve. Modern CACs (post-2014) added "single-limb" aggregation across multiple bond series specifically to make this kind of holdout blockade harder.