A pair of working papers published in early 2026, one from the International Monetary Fund’s Fiscal Affairs Department, the other from the Inter-American Development Bank, attempts to isolate the effect of credible anti-corruption institutional reform on sovereign bond spreads in Latin America. The estimated benefit is modest, but no longer trivial: 35 to 60 basis points for the cleanest cases, controlling for fiscal stance, external accounts and global risk-on/risk-off.

What “credible reform” means in the data

The authors construct a composite index of operational anti-corruption reform, meaning concrete actions such as the creation of a specialised prosecution body, completion of high-profile prosecutions of incumbent or recent ministers, ratification and active use of asset-recovery treaties, and OECD Anti-Bribery Convention monitoring scores. They deliberately exclude rhetorical commitments and reform plans that have not produced indictments.

The countries that score most highly on this operational index over the 2020-2025 period are Costa Rica, Uruguay and Brazil; the lowest-scoring include Argentina, Mexico (especially in 2024-2025) and Venezuela.

The spread effect

Using a propensity-score-matched difference-in-differences design, the IMF paper estimates that a one-standard-deviation move on the operational index over five years is associated with a 35-60 basis point tightening in 10-year USD sovereign spreads, all else equal. The effect is larger in countries with higher baseline external borrowing and smaller in countries running fiscal surpluses, which is consistent with a risk-premium interpretation rather than a growth-fundamentals interpretation.

The IDB paper, using more granular corporate-bond data, finds a similar effect for state-owned enterprises, with the largest tightening among utilities and integrated oil and gas companies.

Why this matters now

Markets have, throughout 2025 and into 2026, treated anti-corruption news from emerging markets as overwhelmingly noise. The Bolsonaro indictment in Brazil, the Kirchner conviction in Argentina, and the SPAK prosecutions in Albania all moved markets by less than 25 basis points on the day. The new work suggests that, while individual events may be priced as noise, the cumulative institutional trajectory is being capitalised, but slowly, and with a lag.

Caveats

Two caveats are worth flagging. First, the operational-reform index is constructed by researchers, not by sovereign analysts, and contains judgment calls that other researchers might code differently. Second, the IMF working-paper series carries an explicit disclaimer that the views expressed are not the institution’s. None of the figures cited here should be read as IMF or IDB policy positions.

Even so, the direction of travel is clear enough that emerging-market sovereign desks should treat credible anti-corruption institution-building as a slow-moving positive carry trade, not as a binary catalyst, but as a structural shift in risk premium.