Written byA credit rating is an independent assessment of how likely a government, company or debt issue is to meet its obligations on time, graded from AAA down to D.
Also known as: issuer rating, issue rating, sovereign rating, corporate credit rating
Key points
- It is not a personal credit score: scores measure an individual's borrowing behaviour for retail lending, while ratings cover larger issuers and instruments.
- S&P, Moody's and Fitch dominate; AAA/Aaa is the top grade, BBB-/Baa3 the lowest investment grade, and D means in default.
- A higher rating usually lowers the spread an issuer pays; a downgrade can push out investors whose mandates only allow investment-grade holdings.
- Agencies attach outlooks (positive, stable, negative) and watchlists that signal the likely direction of a rating before it changes.
- For households and small businesses, changes in bank or sovereign ratings can flow through to loan margins via wholesale funding costs.
Why credit ratings matter
Ratings influence the cost and availability of capital. A higher rating usually means a lower spread over the benchmark on new bonds or loans, while a lower rating raises the yield investors demand. Pension funds, insurers and banks often have mandates restricting them to investment-grade holdings, so a downgrade below that line can shrink demand for an issuer's bonds and drain liquidity.
Ratings are also a quick proxy for credit risk in markets: significant rating actions can move bond and equity prices and affect counterparty relationships. Regulators such as APRA and ASIC sometimes reference ratings in capital and exposure limits, and credit derivatives are priced off rating-implied default probabilities. For a small business or household, a change in the sovereign or bank rating can flow through to loan margins via wholesale funding costs.
Types of ratings and the scale
A sovereign rating assesses a national government's capacity to repay; a corporate rating assesses a company's overall creditworthiness; municipal ratings cover states and public sector bodies. An issue or loan rating applies to a specific bond, commercial paper program or loan and can differ from the issuer rating depending on seniority, security and covenants. Short-term ratings focus on liquidity; long-term ratings on solvency over several years. Structured finance ratings, for securitisations, assess each tranche's credit enhancement and recovery prospects.
On the long-term scale, AAA (Aaa at Moody's) is the highest quality with extremely low default risk, AA and A are very high and strong, and BBB/Baa is lower-medium grade, the last rung of investment grade. BB/Ba and B are speculative, CCC to C mean default is a real possibility, and D is in default. Modifiers (+/- or 1/2/3) add granularity.
How agencies decide, and their limits
Agencies combine quantitative and qualitative analysis: macro and sovereign factors, business profile and industry structure, financial metrics such as leverage (debt to EBITDA), interest cover, free cash flow and liquidity, governance quality, legal and structural features including seniority and collateral, stress tests, and expected recovery in a default. An outlook signals the likely direction over the next six months to two years, a watchlist signals a possible near-term action, and stated triggers, such as leverage rising above a set level, tell you what would prompt a change.
Ratings are useful but not infallible. Agencies are usually paid by the issuers they rate, ratings can lag market prices, models can miss structural shifts, and issuers can shop for the friendliest agency. Treat a rating as one input alongside bond spreads, due diligence and stress testing of your own.
Example
A large company rated BBB is downgraded to BB, falling below investment grade. Funds restricted to investment-grade bonds sell, secondary-market liquidity drops, and the company's next bond issue has to offer a wider spread, raising its future borrowing costs. It may need to draw on bank lines or shorten its maturities, which affects its cash flow planning. In the reverse case, a bank upgraded from BBB- to BBB+ sees the margin on its commercial paper and senior debt fall, and refinances maturing bonds at lower spreads.
Not to be confused with
- Credit risk
- credit risk is the lender's exposure to a borrower not paying; a credit rating is an agency's grade that summarises that risk for an issuer
- Comprehensive credit reporting (CCR)
- comprehensive credit reporting is the system that builds an individual's credit file and score; a credit rating grades governments, companies and bond issues
Frequently asked questions
What is the difference between a credit rating and a credit score?
A credit rating is an agency's assessment of a government, company or specific debt instrument, used by institutional investors, banks and regulators in capital markets. A credit score is a number summarising an individual consumer's borrowing and repayment behaviour, drawn from their credit file and used for retail lending decisions such as personal loans and credit cards.
Who are the major credit rating agencies?
S&P Global Ratings, Moody's Investors Service and Fitch Ratings are the three globally referenced agencies; national and specialist agencies also operate. Their assessments matter because they shape investor demand, regulatory treatment and borrowing costs, and many investment mandates are written by reference to their rating scales.
What do ratings like AAA, BBB and C mean?
AAA (Aaa at Moody's) is the highest credit quality with extremely low default risk. BBB/Baa is the lowest investment-grade band, so a fall below it moves an issuer into speculative territory. BB and B are speculative, CCC to C signal that default is a real possibility, and D means the issuer is in default.
How does a downgrade affect borrowing costs?
A downgrade reduces demand from investors whose mandates require higher grades, which lowers liquidity and raises the yield, or spread, that new debt has to offer. That increases the issuer's cost of new borrowing and can lift the cost of existing variable-rate funding. Borrowers further down the chain can feel it through higher bank funding costs.
What is a rating outlook or watchlist?
An outlook (positive, stable or negative) indicates the likely direction of a rating over the medium term, typically the next six months to two years. A watchlist is a shorter-term status signalling a higher probability that the agency will upgrade or downgrade soon. Both are worth reading before planning finance, hedging or refinancing.
Related terms
Credit risk
Credit risk is the possibility that a borrower or counterparty will default on their contractual repayments, leaving the lender or investor with a loss.
Read definitionComprehensive credit reporting (CCR)
Comprehensive credit reporting (CCR) is the system under which lenders share positive credit information, such as repayment history and credit limits, as well as defaults, on your credit file.
Read definitionCredit
Credit is the ability to borrow money or receive goods and services now in return for a promise to repay later, usually with interest and fees on agreed terms.
Read definitionDefault
A default is a borrower's failure to meet the terms of a credit contract, usually by missing repayments, which lets the lender demand the balance and enforce its security.
Read definitionSpread (finance)
A spread is the difference between two related rates or prices, such as a lender's rate and its benchmark, or an asset's buy and sell price.
Read definitionProbability of default (PD)
Probability of default (PD) is an estimate of the chance that a borrower will fail to meet their contractual repayments within a set period, usually one year.
Read definitionGo deeper
Sources
This article is general information only and is not financial advice.