S&P Global Ratings cut Belgium’s sovereign rating by one notch on Tuesday, moving it to AA-, its fourth‑highest grade, with a stable outlook. The downgrade marks the agency’s second rating action on the country within a week, reflecting concerns over Belgium’s persistent fiscal imbalance, the largest budget deficit in the euro zone. Analysts warn it may tighten banks’ capital buffers for Belgian loans.

Belgium’s structural deficit has hovered around 6% of GDP, forcing the government to rely on borrowing to fund public services and social security. Investors watch the rating closely because a lower grade can raise borrowing costs, tighten market access and pressure the sovereign bond market, where Belgium’s benchmark 10‑year yields already trade at a premium to peers and pension liabilities.

The downgrade adds to a string of fiscal pressures confronting euro‑zone members, prompting Brussels to urge tighter budget discipline. Belgium’s finance ministry signaled plans to curb spending, but any delay could see further rating pressure. Market participants will now price in the likelihood of higher yields, tightening financing conditions for both the public and private sectors, including corporate borrowers.