What Is IG Spread?

What is IG Spread?

Investment Grade Credit Spread (ICE BofA IG OAS) is tracked in our framework because it captures a distinct dimension of US dollar liquidity. The DLI headline is built from the net-liquidity flow — the Fed balance sheet minus TGA minus ON RRP — plus an acute funding-stress override (SOFR-IORB, SRF). Policy and funding inputs drive that headline directly; credit and market-risk inputs are shown as context panels on the liquidity map alongside it.

The indicator uses a "higher_worse" direction, meaning rising values signal tightening liquidity conditions. This directional assignment is based on the historical relationship between the indicator's movement and subsequent risk asset performance.

BAMLC0A0CM — ICE BofA US Corporate Index Option-Adjusted Spread (Investment Grade). It tracks investment-grade-rated US corporate bonds and is published on the same daily, business-days-only cadence as the site's tracked hy-spread (BAMLH0A0HYM2), with roughly a one-business-day lag. Read alone it only says whether IG borrowing costs are cheap or expensive. Charted against hy-spread, the gap between the two is the real signal: it shows whether credit stress is confined to junk-rated borrowers or has spread up into investment grade.

Why IG Spread matters for risk assets

Changes in IG Spread influence the broader liquidity environment through both direct and indirect channels. Directly, it affects the cost or availability of funding. Indirectly, it shifts market expectations about future policy or credit conditions.

For Bitcoin and equities, the impact is most visible when IG Spread moves to extreme z-scores (above +1.5 or below -1.5). At these levels, the historical correlation with risk asset returns strengthens significantly. Moderate moves within the normal range tend to have weaker predictive power.

Cross-reference with HY Spread, 10Y Real Yield, SOFR-IORB, Dollar Index for multi-indicator confirmation. The strongest signals come when multiple related indicators move in the same direction.

How to interpret daily updates

On the indicator detail page, follow this 3-step process:

Step 1: Check the percentile (5Y) to understand historical context. Above the 75th percentile is noteworthy; above the 90th is extreme. Step 2: Review the 7-day and 30-day trend direction — trend matters more than any single reading. Step 3: Read it beside the DLI score, not inside it — IG Spread is reference context and never appears as a score driver, so its job is to explain or contradict what the headline is doing, not to move it.

Pay attention to divergence instead: when IG Spread moves hard while the DLI score stays flat, that gap is the signal. A context indicator earns its place precisely when it disagrees with the headline.

Common mistakes and better workflow

Mistake: assuming everything charted on this site feeds the score. IG Spread does not — it carries zero weight in the DLI and can never show up as a listed driver. Reading a move here as "so the score should have changed" is the single most common error with reference indicators.

Better workflow: Start with the score reading on the homepage. Then check the top drivers. Only then drill into IG Spread if it's flagged as significant. This top-down approach prevents single-indicator tunnel vision. Combine with HY Spread, 10Y Real Yield, SOFR-IORB, Dollar Index for the most complete assessment.