What Is a Credit Spread? Corporate, High-Yield and Sovereign Spreads Explained

A credit spread is the extra yield a bond pays over a safer benchmark bond of similar maturity, usually a government bond, quoted in basis points (bp).

It is the market's price for lending to a borrower that might not pay in full, plus compensation for other differences such as how easily the bond trades. This page covers how a spread is calculated, the main kinds (corporate investment grade, high yield and sovereign), what an option-adjusted spread is, what a spread is made of, why spreads are watched as a gauge of financial conditions, and how Kresmion uses them in its macro regime engine and its sovereign spread table. It is descriptive throughout.

How a credit spread is calculated

Take an illustrative 10-year corporate bond yielding 5.30 percent and a 10-year Treasury yielding 4.20 percent. The spread is 5.30 minus 4.20, or 1.10 percentage points, which is 110 basis points (one basis point is 0.01 percentage point). The bond explainer works through the same idea with a 150 basis point example.

The benchmark must match the bond's maturity, since a 10-year bond compared with a 2-year Treasury mixes credit risk with the shape of the yield curve. And a spread is a difference between yields, so it can widen because the risky bond's yield rose, because the benchmark's yield fell, or both. A wider spread means investors demand more extra yield for the same maturity; a tighter one means they demand less.

The main kinds of credit spread

Investment grade corporate spreads. Bonds rated above the high yield line, BBB minus or higher by S&P and Fitch (Baa3 or higher by Moody's), are investment grade. Their spreads are the narrowest of the corporate market.

High yield spreads. Bonds rated below that line, BB or lower by S&P and Fitch or Ba or lower by Moody's, are high yield, also called junk bonds. The SEC's Investor.gov glossary describes them as bonds believed to have a higher risk of default, typically issued at a higher yield than more creditworthy bonds. High yield spreads are wider, and they move further when conditions change.

Sovereign spreads. The same subtraction works between two governments. Inside the euro area, a country's 10-year yield over Germany's 10-year Bund is read mainly as a credit and liquidity spread (plus, at times, the risk of a country leaving the euro), because both bonds pay in euros. Between countries with different currencies, the gap also carries differences in expected inflation and currency, so it is not a pure credit measure.

Option-adjusted spreads

Many corporate bonds can be redeemed early by the issuer, which makes them worth less to a holder than an otherwise identical bond without that option. An option-adjusted spread (OAS) estimates the spread after removing the value of such embedded options, so that callable and non-callable bonds can be compared on the same footing. It is measured against a whole curve of government rates rather than a single benchmark yield, so it is not quite the simple yield difference in the example above. Widely followed high yield spread series are OAS measures: the ICE BofA US High Yield Index OAS, published on FRED, is described as the spread between an OAS index of all bonds in the below investment grade category and a spot Treasury curve. Its constituents are rated below investment grade, based on an average of Moody's, S&P and Fitch.

What a spread is made of

A spread compensates for more than expected default losses.

• Expected loss. The chance of default multiplied by how much would be lost if it happened.
• A risk premium. Extra compensation for carrying credit risk at all, which rises when investors are less willing to take risk.
• Liquidity. A bond that is harder to sell quickly at a fair price is worth less to a holder, and investors want to be paid for that.

Federal Reserve researchers have estimated the part of corporate bond spreads that is not directly attributable to expected default risk, which they call the excess bond premium, and describe it as a measure of investor sentiment or risk appetite in the corporate bond market. They use it to estimate the probability of a US recession within the next 12 months, a link the recession explainer covers.

Why spreads are watched

Because spreads move with both default expectations and risk appetite, they are read as a gauge of financial conditions. Wider spreads raise borrowing costs for companies, especially lower-rated ones that refinance often. A quick widening shows that lenders are asking more to take credit risk. Spreads do not say why: a sector shock, a rise in risk aversion, a liquidity squeeze or a change in the benchmark yield can each widen them.

How Kresmion uses credit spreads

In the macro regime engine. Kresmion's macro regime engine takes the high yield option-adjusted spread as one of its inputs. It measures how much the spread has moved over its last five readings compared with the usual size of such moves, and a spread widening faster than usual pulls the score toward risk-off. The input sits in both the liquidity and the risk appetite factors. The current label and score are on the free macro regime page, and the factor breakdown opens with a free account. The regime score explainer covers how the inputs are combined.

In the sovereign spread table. Kresmion's sovereign spreads page lists each covered country's 10-year government bond yield and its spread over the German Bund and over the US 10-year Treasury, in basis points, with 1-month and 12-month changes. The yields are monthly averages published by the ECB, the OECD and the Federal Reserve; the spreads are a Kresmion calculation from those published yields, not a credit rating, and no rating agency is involved. In August 2026, Italy's 10-year yield was about 80 basis points over the Bund and France's about 82 (the table rounds to whole basis points). Japan's sat about 24 basis points below the Bund that month, a gap that partly reflects a different currency and inflation outlook rather than a judgment that Japan is a better credit than Germany.

Honest limitations

A spread is a market price, so it moves with liquidity and risk appetite as well as default risk, and a single reading cannot separate them. Index spreads change composition as bonds are upgraded, downgraded, issued and repaid, so a long history compares different baskets. Kresmion's sovereign table uses monthly averages that trail the market by several weeks, and outside the euro area its spreads mix credit with currency and inflation expectations. In the regime engine, on days when the official spread series cannot be fetched, Kresmion falls back to the price of a high yield bond ETF, HYG, which is a coarse stand-in and not the spread itself.

Key takeaways

Frequently asked questions

What does it mean when credit spreads widen?

Investors are demanding more extra yield to lend to riskier borrowers than to the government. That can reflect higher expected defaults, lower appetite for risk, poorer market liquidity, or a mix. The spread itself does not say which.

What is the difference between a credit spread and a credit rating?

A credit rating is an agency's opinion of an issuer's ability to pay, revised from time to time. A credit spread is a market price that changes every trading day. Bonds with the same rating can trade at different spreads.

Is a credit spread the same as an option-adjusted spread?

An option-adjusted spread is one way of measuring a credit spread. It strips out the value of options embedded in a bond, such as the issuer's right to redeem it early, so that bonds with and without such features can be compared.

Are Kresmion's sovereign spreads credit ratings?

No. Kresmion subtracts one published 10-year government bond yield from another. Inside the euro area that difference is close to a credit and liquidity spread; across currencies it also reflects inflation and currency expectations.

Do credit spreads predict recessions?

They are one of several indicators watched for that purpose, and Federal Reserve research uses a component of corporate spreads in a recession probability model. A model probability is not a forecast that a recession will happen.

This page is information, not investment advice.

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Source: SEC, Investor.gov glossary, High-yield Bond (or Junk Bond), https://www.investor.gov/introduction-investing/investing-basics/glossary/high-yield-bond-or-junk-bond ; FRED, ICE BofA US High Yield Index Option-Adjusted Spread (BAMLH0A0HYM2), series notes, https://fred.stlouisfed.org/series/BAMLH0A0HYM2 ; Federal Reserve, FEDS Notes, "Updating the Recession Risk and the Excess Bond Premium" (2016), https://www.federalreserve.gov/econres/notes/feds-notes/updating-the-recession-risk-and-the-excess-bond-premium-20161006.html ; ECB Data Portal, IRS (long-term interest rates for convergence purposes), https://data.ecb.europa.eu/data/datasets/IRS ; OECD Main Economic Indicators, long-term interest rates, https://data-explorer.oecd.org/ ; Kresmion sovereign spread calculation (August 2026 monthly averages) and macro regime engine. The 110 basis point example uses illustrative yields.

Kresmion Research.