The Fed is the best defense against U.S. sovereign downgrade, says rating agency

S&P Global reaffirmed the U.S. AA+ sovereign credit rating, but explicitly warned that maintaining this hinges on the Federal Reserve's continued independence. Despite projections of U.S. government deficits averaging 6% of GDP and debt exceeding 100% of GDP by 2028, the rating agency views the Fed's credibility, flexibility, and role in preserving the dollar's reserve status as crucial mitigants to these fiscal weaknesses. The report indicates that political developments diminishing the Fed's independence, amid a lack of bipartisan fiscal consensus, could lead to a downgrade, underscoring the central bank's unique role in stabilizing U.S. creditworthiness and preventing a scenario akin to countries with compromised central bank autonomy.

Analysis

S&P Global has reaffirmed the U.S. sovereign credit rating at AA+, but the report underscores that this rating is critically dependent on the institutional independence of the Federal Reserve. The analysis highlights a significant divergence between the country's strong monetary framework and its weak fiscal profile, with government deficits projected to average 6% of GDP through 2028 and total government debt expected to exceed 100% of GDP by the same year. S&P explicitly states that without the Fed's credibility and its crucial role in maintaining the U.S. dollar's dominant reserve currency status—which accounts for 60% of global central bank reserves—the rating would likely be materially lower. The primary risk identified is political, with S&P's institutional assessment for the U.S. noted as being "below that of some peers" due to political polarization and a lack of bipartisan consensus to address fiscal deterioration. The report warns that a downgrade could be triggered if political developments were to diminish the Fed's independence, drawing a sharp contrast with Turkey (BB-), where political interference in monetary policy led to currency collapse and severe inflation.

Key Decisions for Investors

• Investors should closely monitor any political rhetoric or legislative proposals that could be perceived as threatening the Federal Reserve's independence, as this is explicitly cited as the primary trigger for a potential sovereign credit downgrade.
• Given the deteriorating fiscal outlook, it is crucial to track the yield spread between U.S. Treasurys and other sovereign bonds; any sustained narrowing of this spread without a corresponding improvement in U.S. fiscal metrics could signal eroding market confidence in its "exorbitant privilege."
• Long-term investors should consider the stability of the U.S. dollar's reserve status as a key variable, as any erosion of Fed credibility could impact the currency, suggesting a potential strategic case for portfolio diversification into other currencies or asset classes.