Sovereign default: what it means, how it happens, what follows

A sovereign is in default when it fails to make a scheduled principal or interest payment within the grace period specified in the debt contract, or when it unilaterally changes the terms of that contract in a way that is disadvantageous to the creditor. Rating agencies also treat a distressed debt exchange (one accepted by creditors only because the alternative is worse) as a default.

Because sovereigns cannot be forced into liquidation, default is not extinguishment. The debt continues to exist and to accrue interest until restructured. Litigation risk depends on the debt's governing law: New York and English law bonds are enforceable in those jurisdictions and have produced landmark cases (Argentina vs. NML Capital).

Sovereign defaults cluster around three drivers. First, external shocks, commodity price collapses, sudden stops in capital inflows, or a sharp appreciation of the currency in which debt is denominated. Second, fiscal profligacy compounded by short average maturity and a heavy foreign-currency debt stock. Third, political events: war, revolution, or a change of regime that repudiates prior obligations.

The trigger is almost always a liquidity event (inability to roll over maturing debt) even when underlying solvency was already impaired. That is why debt sustainability analyses focus on gross financing needs, not just the debt-to-GDP ratio.

S&P uses 'SD' (Selective Default) when a specific issue is in default while others perform, and 'D' when the sovereign is in general default. Moody's uses 'Ca' for likely default and 'C' for confirmed default. Fitch uses 'RD' (Restricted Default) and 'D'. Ratings drop to these levels only on the actual missed payment or the announcement of a distressed exchange, they lag the market by design.

A sovereign can be rated CCC or B- for years without defaulting. Conversely, once in default, the recovery to a performing rating (typically B- or B) happens quickly, within months of the exchange closing.

Historical recovery on defaulted sovereign eurobonds averages 40-50 cents on the dollar in present-value terms, with a wide dispersion. The 2012 Greek PSI produced a recovery near 25 cents. The 2020 Ecuadorian exchange landed around 55. The recent Zambian deal on eurobonds settled near 45.

For an investor, the useful signals ahead of a likely default are: rising credit default swap spreads above 1,000 basis points sustained over months, the sovereign's own admission of unsustainable debt in an IMF Article IV or DSA, the announcement of a debt-management adviser retention (Lazard, Rothschild, Newstate), and the opening of formal talks with the Paris Club or the G20 Common Framework.