Credit Ratings & High-Yield Debt: Default Risk & Spreads

Two bonds, same maturity, and one pays three points more than the other. That gap isn't generosity or a mispricing waiting to be collected — it's a price the market has quoted for a specific risk, and the question is whether it's enough.

Last verified 2026-07-28

Where the line sits, and what it means

Rating agencies grade an issuer's ability to pay. FINRA states the boundary precisely: bonds rated below Baa3 by Moody's, or below BBB by S&P and Fitch, are considered speculative grade — commonly called high-yield, and less commonly called junk by people being blunt.

So BBB−/Baa3 is the lowest investment grade rung and BB+/Ba1 is the first speculative one. Those two sit one notch apart and describe issuers that aren't dramatically different, yet the line moves real money: many institutional mandates forbid speculative-grade debt, so a downgrade across it forces selling.

Worth keeping in view that a rating is an opinion about credit quality, not a guarantee and not a measure of price risk. An AAA bond with a long maturity can still lose a great deal of value when rates rise — that's the previous lesson's risk, and a rating says nothing about it.

The spread is the price of the risk

FINRA defines a credit spread as the difference between a bond's yield and that of a relatively risk-free U.S. Treasury bond of the same maturity, measured in basis points, where one basis point is 0.01 percent.

Matching the maturity is what makes the comparison mean anything. Compare a five-year corporate against a five-year Treasury and the difference isolates credit risk, because both carry the same exposure to rate moves. Compare it against a thirty-year Treasury and you've mixed two different risks into one number.

What's left after that isolation is the market's quoted price for the chance this issuer doesn't pay. That reframes the decision usefully: the question is never 'is 7.5% a good yield', it's 'is 350 basis points enough compensation for this issuer's default risk' — and both halves of that sentence are needed to answer it.

High yield fails at the moment you need it not to

The default risk in a high-yield bond is real, but the more useful observation is about timing. Companies with weak balance sheets struggle in recessions — which is when equities are also falling.

FINRA describes the market behaviour: when the economy gets shaky, investors may rush to shed high-yield bonds for safer ones such as Treasuries, and prices drop as supply outruns demand. So the losses tend to arrive alongside your stock losses rather than offsetting them.

That's the case against treating high yield as the bond half of a portfolio. Its job in most allocations — cushioning equity drawdowns — is precisely what it does worst, because it behaves partly like equity. Investment-grade and Treasury holdings are what perform that role, and it's a reason to look at what a 'bond fund' actually holds rather than trusting the label.