Credit Spreads
The extra yield over a government bond of the same maturity. It compensates for default risk and for liquidity, and it is one of the better-watched indicators of financial conditions.
MadStockAlerts Research · Updated August 29, 2026
What to take away
- The spread is the compensation for everything other than the risk-free rate.
- It is measured in basis points and quoted against a matched-maturity government yield.
- Spreads widen in stress and compress in calm, sometimes to very low levels.
- They frequently move before equity markets and before ratings.
- Option-adjusted spread strips out the effect of embedded options.
MAD Academy Training Video · 0:46
The Market's Live Fear Gauge
A credit spread is the extra yield demanded over a government bond, and it reprices continuously while ratings do not.
This lesson is part of a Stock Alerts + Tools plan.
The measure
A credit spread is the difference between a bond's yield and the yield on a government bond of comparable maturity, expressed in basis points. A corporate bond yielding 6.2 percent against a 4.2 percent Treasury has a two hundred basis point spread.
| Variant | What it adjusts for |
|---|---|
| Nominal spread | Nothing. A simple yield difference |
| Z-spread | The shape of the whole yield curve rather than one point |
| Option-adjusted spread | Any embedded call or put option in the bond |
| Asset swap spread | Expressed against a floating reference rate |
The third row matters for any callable bond. A call option benefits the issuer, so a callable bond yields more than an otherwise identical bullet bond, and the option-adjusted spread removes that difference to leave the credit component.
What the spread compensates for
- Expected loss from default, which is the probability of default multiplied by the loss given default.
- Uncertainty about that expected loss, which is a risk premium on top of the expectation.
- Liquidity, since a bond that is difficult to sell requires additional compensation.
- Any structural features, including subordination and covenant weakness.
Empirically, spreads have generally exceeded what realised default losses alone would justify, which is usually attributed to the second and third components. The gap is the reason credit has produced a return above governments over long periods.
Spreads as a conditions indicator
Credit spreads are widely watched as a measure of financial conditions, and they have a reasonable record of moving early. Credit markets are dominated by institutional participants analysing the same balance sheets that equity holders do, with a claim that is senior to theirs.
| Spread behaviour | Conventional reading |
|---|---|
| Widening while equities rise | A divergence worth noticing. Credit is more sensitive to solvency |
| Compressing to historic lows | Ample risk appetite, and little compensation for the risk being taken |
| Widening sharply | Tightening financial conditions, and a rising cost of capital for issuers |
| High-yield widening more than investment grade | Stress concentrated in weaker issuers, which is the usual pattern |
The relationship is a tendency rather than a rule, and divergences have persisted for long periods without resolving in the direction credit implied.
Scroll the chart sideways to see all of it.
- High yield
- Investment grade
Why spread and yield can move apart
A corporate bond's yield has two components, and they frequently move in opposite directions. In a flight to quality, government yields fall while credit spreads widen, and the corporate yield can end anywhere.
- Falling government yields with stable spreads: corporate yields fall, prices rise.
- Stable government yields with widening spreads: corporate yields rise, prices fall.
- Falling government yields with sharply widening spreads: the usual crisis pattern, and corporate prices fall despite the rate move.
The third case is what makes corporate credit behave like equity in a downturn. Government bonds provided a diversification that corporate bonds did not, because the spread component swamped the rate component.
Reading spreads across the market
Aggregate spread indices are published for broad segments of the credit market, and the relationships between them carry more information than any single level.
- Investment grade against high yield: the ratio widens sharply in stress, as weaker issuers are repriced first.
- The lowest-rated tier against the rest of high yield: the earliest place distress usually appears.
- Financials against industrials: a divergence points at the banking system rather than at the economy.
- New issuance volume: a market that stops issuing has effectively closed, which is a stronger signal than any spread level.
The fourth item is worth watching alongside the prices. A primary market that has closed means issuers cannot refinance, which turns a spread widening into a solvency question for anything with a near-term maturity.
Spread levels are also compared against their own history rather than in absolute terms, since the compensation required varies with the rate environment and with the composition of the index.