What does the TED spread measure, and why is it considered a barometer of financial stress?

The TED spread is one of the classic financial stress indicators and is straightforward once you understand its components.

Definition:

TED Spread = 3-month LIBOR (or SOFR equivalent) - 3-month T-bill yield

'TED' originally stood for T-bills vs. Eurodollar deposits (ED), but the concept applies to any interbank rate vs. government rate comparison.

What It Captures:

T-bill yield = Return on lending to the US government (virtually zero default risk)

3-month LIBOR = Return on lending to a major bank for 3 months (some default risk)

The spread between them represents the premium that banks charge each other above the risk-free rate. When banks are nervous about each other's solvency, this premium widens dramatically.

Interpreting the TED Spread:

Historical Episodes:

• Pre-2007: TED spread averaged ~25-30 bps
• August 2007 (BNP Paribas freezes funds): TED jumped to ~200 bps overnight
• September 2008 (Lehman Brothers): TED spiked to ~460 bps — banks essentially refused to lend to each other
• March 2020 (COVID-19): TED spiked to ~140 bps before Fed intervention
• Normal 2024-2026: ~15-30 bps

Why TED Spread Matters for Fixed Income Investors:

1. Credit spread forecasting — TED widening predicts corporate bond spread widening
2. Liquidity risk — A rising TED spread means funding is becoming more expensive and scarce
3. Flight to quality — When TED rises, T-bill yields often fall as investors pile into safety
4. Monetary policy signal — A persistently wide TED spread may prompt central bank intervention (emergency lending facilities)

Example: In March 2025, Fortuna Fixed Income Fund observes the TED spread widening from 20 bps to 75 bps over two weeks. Their credit analyst interprets this as:

• Banking system stress is building
• Corporate bond spreads will likely follow
• Reduce credit risk in the portfolio
• Move toward higher-quality, shorter-duration positions

Post-LIBOR Note: With the transition to SOFR, the traditional TED spread calculation has evolved. Many practitioners now use the 3-month SOFR rate or overnight SOFR compounded over 90 days as the interbank rate component.

Exam Tip: Know the definition, interpret different levels, and understand that TED spread is a leading indicator of broader credit market stress.

Learn more about credit indicators in our CFA Level II fixed income modules.