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A corporate bond rating is an agency’s opinion of the issuer’s or bond’s relative credit risk—not a guarantee of repayment or a verdict on whether the bond is a good investment. Before investing, identify the rating agency and the exact issue-level rating, then weigh it alongside the bond’s terms, price, yield, maturity, liquidity and the issuer’s financial disclosures.
Start with the agency and the bond being rated
Credit rating agencies use their own symbols and methodologies to assess the relative credit risk of an issuer or a particular debt obligation. Check whether a rating applies to the company generally or to the specific bond you are considering; those ratings can differ. Also note the agency, its symbol system and the date of the rating action. The SEC’s Investor Bulletin on credit ratings explains that ratings reflect agency models, assumptions, expectations and judgment, which may not match an investor’s own assessment.
How to read the rating scale
On common long-term scales that use plus and minus notches, the ratings generally descend from AAA to D. S&P and Fitch use BBB− as the bottom of investment grade; Moody’s uses Baa3. The SEC describes the broad boundary as between the BBB and BB categories. Moody’s long-term global scale instead runs from Aaa to C, so do not treat similarly placed symbols across agencies as identical. Confirm the scale and the precise rating with the named agency; a notch is a relative ranking, not a precise probability that a particular bond will default.
- Investment grade: BBB− or higher at S&P and Fitch, or Baa3 or higher at Moody’s, on the relevant long-term scale.
- Non-investment grade: below that boundary; also called speculative grade or high yield.
A higher rating generally means the agency assesses lower relative credit risk than it does for lower-rated debt. It does not establish that a bond is fairly priced or suitable for you. Moody’s describes its ratings as forward-looking opinions of relative credit risk, based on sector- or category-specific methodologies and quantitative and qualitative factors. The agency reports an average one-year default and loss position (AP) of 95% for 2024 and 91% for the average since 1983, describing the measure as an indicator of its predictive quality and rank ordering. Those are Moody’s self-reported measures, not an individual bond’s chance of repayment or a guarantee.
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Separate the rating from outlooks and watches
An outlook or watch is a signal about possible future rating action; it is not the rating itself, and it cannot be relied on as a complete early-warning system. Moody’s outlook categories are Positive, Negative, Stable and Developing. Moody’s says Stable indicates a low likelihood of a rating change over the medium term, while the other categories indicate a higher likelihood. In most cases, Moody’s follows up on an outlook change in about 12–18 months; that timing is specific to Moody’s and should not be assumed for other agencies.
Ratings may change at any time, and an outlook or watch may not precede a rating action. If agencies disagree, record each agency’s rating, scale and date and investigate the differences; averaging notches does not resolve the disagreement or show which rating is definitive. A downgrade means the agency has changed its assessment of relative creditworthiness, not that the bond is automatically unsuitable or unattractively priced.
What a rating does not tell you
A rating is not investment advice or a buy, sell or hold recommendation. It does not assess the price at which a bond is offered or sold, and it does not capture every investment risk, including market and liquidity risk. Even a highly rated bond can default. As the SEC’s October 12, 2017 bulletin puts it: “A credit rating is not a guarantee that a financial obligation will be repaid.”
High-yield bonds generally offer higher rates to compensate for greater default risk, but a higher yield does not prove that the bond is cheap or that the compensation is adequate. Investors also face interest-rate, economic and liquidity risks. Longer maturities generally expose bonds of similar credit quality to more interest-rate risk than shorter maturities.
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Review the bond’s documents and terms
Read the prospectus or other offering documents, along with the issuer’s financial disclosures and relevant industry information. For registered public offerings, prospectuses are available through SEC EDGAR. Check these items for the specific bond:
- Rating: Agency, exact issue-level symbol, outlook or watch, and date of action.
- Maturity and rate exposure: Maturity date and duration or other available measure of interest-rate sensitivity.
- Price, yield and calls: Current price and yield in relation to call dates and call protection. If a bond is called before maturity, you may receive principal early and be unable to reinvest it at a similar rate.
- Seniority and security: Whether the bond is secured, senior unsecured or subordinated, and where it ranks among the issuer’s obligations.
- Covenants and payment terms: Restrictions on actions such as dividends or additional borrowing, payment-in-kind provisions, and any conditions under which payments may be skipped. Covenant-lite terms deserve attention.
- Liquidity and issuer condition: How readily the bond may be sold and what the issuer’s disclosures indicate about its financial condition.
There is no universal weighting formula for these factors. The appropriate comparison depends on the bonds’ terms and your own objectives and ability to bear risk.
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Why treat ratings as one input
Agencies can face conflicts of interest: many are paid by the issuers or obligors they rate, while subscriber-paid models can also create conflicts related to investors’ holdings and trading positions. SEC registration as a nationally recognized statistical rating organization (NRSRO) is not SEC endorsement of an agency or its ratings. Use a rating as a starting point for document review, not as a substitute for it. For educational background, see the SEC’s credit ratings bulletin, its corporate bonds overview, and its high-yield bond bulletin. Moody’s explains its scale and outlook terminology in its ratings FAQ.
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