Updated for the 2026-2027 CFA® Level I curriculum.
A rating condenses an agency's credit opinion into a familiar scale. That makes it useful for screening bonds, but the investor still needs to assess current conditions, bond terms, and price before reaching a decision.
Quick Answer
Credit ratings express an agency's opinion of relative creditworthiness. Investors use them for screening, comparison, mandate limits, and communication. A major disadvantage of credit rating analysis is that ratings can lag fast-moving conditions and do not measure every source of investment risk.
Key Takeaways
Ratings help compare default risk across issuers and issues.
Mandates and regulations may refer to rating categories.
Ratings are opinions, not guarantees or recommendations.
They can change or lag sudden events.
Equal ratings do not imply equal liquidity, value, or total risk.
What You Need to Know for CFA Level I
Explain what an issuer or issue rating communicates about relative creditworthiness.
Recognize that a downgrade can reflect worsening credit conditions but may follow the market's earlier reassessment.
Distinguish a broad issuer assessment from an issue rating affected by security and seniority.
Identify risks a rating does not settle, including liquidity, market price, and changes since the last review.
What Does a Credit Rating Measure?
A rating summarizes relative creditworthiness using a defined scale. It reflects an agency's view of the issuer's or issue's capacity and willingness to meet obligations.
How Investors and Markets Use Credit Ratings
Ratings let investors screen eligible bonds and compare broad credit categories. Mandates may use rating thresholds, so a rating change can affect which investors may hold an issue. A rating is an opinion about creditworthiness, not a live market price or a recommendation to buy. Check the bond's current terms, liquidity, and yield as well.
What Are the Limitations of Credit Ratings?
Ratings are opinions formed from available information and can change after conditions deteriorate. The table links each limitation to the risk of relying on the rating alone.
Limitation | Why it matters |
|---|---|
Information and model limits | The agency may not capture every risk |
Lag | A sudden event can occur before a rating change |
Migration | Ratings can be upgraded or downgraded |
Narrow scope | Market price, liquidity, and suitability are separate |
How to Use Ratings in Credit Analysis
Combine the rating with current financial data, industry conditions, management actions, security ranking, covenants, liquidity, valuation, and scenario analysis. Treat an external credit rating as a starting point, not the final decision.
Working Example
Bonds A and B both carry the same rating. Bond A is a large, liquid senior issue with protective covenants. Bond B is smaller, subordinated, and rarely traded.
The rating helps place both in a broad credit category, but it does not establish equal recovery, liquidity, or value. An investor still needs issue-specific analysis.
Common Exam Traps
Treating a rating as a buy or sell recommendation
Ratings summarize credit opinion; they do not tell an investor whether the bond's price, yield, liquidity, or fit is attractive.
Assuming equal ratings imply equal total risk
Bonds with the same rating can have different interest-rate sensitivity, liquidity, currency exposure, or issue-specific terms.
Assuming a rating never changes
An issuer's credit condition can deteriorate before a rating action; use current financial evidence rather than relying solely on a historical grade.
Ignoring issue-specific features
Secured claims, subordination, and guarantees can make an individual bond's rating differ from the issuer's general rating.
Calling a high rating a guarantee against default
A rating is an opinion based on available information, and unexpected losses or changes in conditions can still produce a default.
Practice Question
Which statement best describes a limitation of credit ratings?
They guarantee that a rated issuer will not default
They can lag rapid changes in an issuer's credit condition
They directly determine a bond's coupon payment
Correct Answer: Option B
Explanation: Credit ratings can lag rapid changes because they are opinions based on information available at the time of analysis.
Option A: A credit rating is not a guarantee that an issuer will avoid default.
Option C: A bond’s coupon payment is set by its contractual terms, not directly by its credit rating.
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FAQs About Credit Ratings Uses and Limitations
What are credit ratings used for?
They support credit comparison, screening, mandate controls, and market communication.
What is a disadvantage of credit rating analysis?
Ratings may lag events and do not capture every source of investment risk.
Are credit ratings investment recommendations?
No. They are credit opinions, not buy or sell recommendations.