The United States no longer holds the top credit rating from all major agencies. S&P downgraded the US from AAA to AA+ in 2011; Fitch followed in 2023. Moody’s maintains Aaa but with a negative outlook. Despite these downgrades, Treasury yields showed no lasting increase—raising questions about what sovereign ratings actually signal and whether they matter for investors.
Current US Ratings
| Agency | Rating | Outlook | Last Action |
|---|---|---|---|
| S&P | AA+ | Stable | Downgrade August 2011 |
| Moody’s | Aaa | Negative | Outlook change November 2023 |
| Fitch | AA+ | Stable | Downgrade August 2023 |
What AA+ means: Second-highest rating tier. Indicates “very strong capacity to meet financial commitments” but slightly more susceptible to adverse conditions than AAA.
What the ratings do not mean: They do not indicate any meaningful default risk for a country that borrows in its own freely floating currency.
The 2011 S&P Downgrade
What Happened
On August 5, 2011, S&P lowered the US rating from AAA to AA+, citing:
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Debt ceiling brinksmanship: Congress came within days of potential default during the 2011 debt ceiling standoff.
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Fiscal trajectory: Rising debt-to-GDP ratios and insufficient deficit reduction plans.
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Political dysfunction: Inability of political system to address long-term fiscal challenges.
Market Reaction
Contrary to expectations, Treasury yields fell after the downgrade:
- 10-year Treasury yield: 2.56% on August 5 → 2.11% on August 10
- Flight to quality amid European debt crisis and US economic weakness
Key insight: The downgrade didn’t reflect new information about US creditworthiness—markets had already priced in fiscal concerns through the debt ceiling crisis.
The 2023 Fitch Downgrade
What Happened
On August 1, 2023, Fitch lowered the US rating from AAA to AA+, citing:
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Repeated debt ceiling standoffs: The 2023 crisis came within days of X-date.
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Fiscal deterioration: Deficits running 6%+ of GDP at near-full employment.
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Governance erosion: “Steady deterioration in standards of governance over the last 20 years.”
Market Reaction
Again, muted:
- 10-year Treasury yield: Rose modestly from 4.03% to 4.18% over following week
- Effect was difficult to separate from other factors (BOJ policy shift, strong data)
- No forced selling or liquidity disruption
Why Ratings Matter Less for the US
Reserve Currency Status
The US dollar is the world’s primary reserve currency:
- ~60% of global foreign exchange reserves held in dollars
- Treasury securities are the dominant safe asset globally
- No alternative exists at comparable scale and liquidity
Implication: Even with a downgrade, demand for Treasuries remains structurally strong because there’s nowhere else to go for risk-free dollar-denominated assets.
Borrowing in Own Currency
The US borrows in dollars, which it can create:
- No foreign currency mismatch risk
- Technical default is a political choice, not an economic constraint
- Inflation risk exists, but solvency risk does not
Key distinction: Countries like Argentina or Greece faced genuine solvency risk because they couldn’t print euros or dollars. The US faces no such constraint.
Market Size and Liquidity
The Treasury market is the largest and most liquid bond market globally:
- ~$27 trillion in publicly held debt
- Average daily trading volume: ~$700 billion
- Deep derivative markets (futures, options, swaps)
Implication: Institutional mandates requiring “investment grade” or “AAA” holdings typically treat US Treasuries as special cases regardless of rating.
What Ratings Do Signal
Governance and Political Risk
Rating agencies increasingly emphasize political factors:
- Debt ceiling dysfunction
- Inability to address structural deficits
- Polarization affecting fiscal policymaking
These concerns are legitimate—but they’re about political risk, not credit risk in the traditional sense.
Relative Fiscal Position
Downgrades signal that the US fiscal position has deteriorated relative to:
- Other AAA-rated countries (Germany, Australia, Switzerland)
- The US’s own historical fiscal trajectory
Long-Term Trajectory Concerns
Rating agencies highlight:
- Rising interest costs as share of budget
- Entitlement spending growth
- Structural deficits even at full employment
These trends are real, even if default risk is negligible.
Rating Agency Methodology
Key Factors Assessed
| Factor | Weight | US Assessment |
|---|---|---|
| Institutional strength | High | Mixed (rule of law strong; governance weakened) |
| Fiscal strength | High | Weakening (rising debt-to-GDP) |
| Economic strength | High | Strong (large, diverse economy) |
| Susceptibility to event risk | Moderate | Low (reserve currency, domestic borrowing) |
Limitations of Sovereign Ratings
Track record: Rating agencies failed to predict most sovereign crises (Asian financial crisis, Argentina 2001, Greece 2010).
Lagging indicators: Ratings typically change after markets have already moved.
Judgment calls: Political assessments are inherently subjective.
Investor Implications
What to Monitor
Debt ceiling dynamics:
- Ratings are most likely to change around debt ceiling crises
- Monitor Congressional calendar and X-date estimates
Fiscal trajectory:
- Watch CBO projections for debt-to-GDP trends
- Track interest costs as share of revenues
Political developments:
- Bipartisan fiscal reform efforts (rare)
- Further governance deterioration
Portfolio Considerations
Short-term: Rating changes have minimal direct portfolio impact. No forced selling occurs because Treasuries are treated as special asset class.
Long-term: Sustained fiscal deterioration could eventually manifest in:
- Higher term premium (investors demanding more yield for duration risk)
- Weaker dollar
- Inflation expectations
Checklist for Rating Events
When a rating action occurs:
- Read the full press release for specific concerns
- Note whether outlook is stable, positive, or negative
- Assess whether markets have already moved
- Check for any policy response from Treasury or Congress
- Monitor Treasury auction results in following weeks
Common Pitfalls
Pitfall 1: Expecting immediate yield spikes
Both 2011 and 2023 downgrades produced minimal lasting yield increases. Treating sovereign downgrades like corporate downgrades leads to incorrect expectations.
Pitfall 2: Conflating rating with default risk
US Treasuries carry effectively zero default risk regardless of rating. The rating reflects fiscal trajectory and governance, not solvency.
Pitfall 3: Ignoring the asymmetry
A US upgrade back to AAA would require sustained fiscal improvement. A further downgrade would require materially worse conditions than already exist. The rating is sticky.
Pitfall 4: Overweighting rating agency credibility
The same agencies rated subprime mortgage bonds AAA before 2008. Their sovereign analysis deserves appropriate skepticism.
Summary
US sovereign ratings have declined from AAA at two of three major agencies, primarily due to political dysfunction around debt ceilings and deteriorating fiscal trajectory. Market impact has been limited because the US retains reserve currency status, borrows in its own currency, and offers unmatched market liquidity. Ratings signal governance and fiscal concerns worth monitoring, but they don’t indicate meaningful default risk. Investors should treat rating changes as one data point among many, not as triggers for portfolio action.
Related Articles
- Debt Ceiling Mechanics and Contingency Plans
- Budget Deficits, Surpluses, and Debt-to-GDP
- Treasury Issuance Schedules and Auctions
References
S&P Global Ratings (2011). United States of America Long-Term Rating Lowered.
Fitch Ratings (2023). Fitch Downgrades the United States’ Long-Term Ratings to ‘AA+’.
Moody’s Investors Service (2023). Moody’s changes outlook on United States’ Aaa ratings to negative.
