Every bond carries a risk that fixed deposit advertising rarely says out loud: the chance that the issuer may not repay you on time or in full. This is credit risk, and it's one of the main reasons some bonds offer higher returns than others. The good news is that you don't have to assess this risk yourself. Independent rating agencies do that for you and publish the result as a simple letter grade.
Think of it as a riskometer
Agencies like CRISIL, ICRA, ACUITE, BRICKWORK, INFOMERICS, CARE and INDIA Ratings (all SEBI-registered) evaluate an issuer's cash flows, debt levels, business stability and repayment track record, then assign a rating that tells you, at a glance, how likely the issuer is to pay on time. It's the same judgment you'd make when lending money to two different businesses, one financially strong and one financially stressed. Credit ratings simply make that assessment systematic and easier to compare.
The rating scale
| Rating | What it means |
|---|---|
| AAA | Highest safety |
| AA+ / AA / AA- | High safety |
| A+ / A / A- | Adequate safety |
| BBB+ / BBB / BBB- | Moderate safety |
| BB+ / BB / BB- | Moderate risk |
| B+ / B / B- | High risk |
| C+ / C / C- | Very high risk |
| D | Default |
Bonds rated BBB or higher are considered investment-grade bonds, meaning they meet a minimum standard of credit quality.
BB+ and below are non-investment-grade bonds (often called high-yield or junk bonds), where higher coupons are intended to compensate investors for taking on a meaningfully greater risk of default.
Government bonds and State Development Loans typically do not carry domestic credit ratings, because they are backed by sovereign or state governments and are generally considered among the lowest-credit-risk instruments available.
Why lower-rated bonds pay more
The logic is straightforward: investors demand higher returns when there is greater uncertainty about repayment. A AAA-rated issuer can borrow at lower rates because lenders have a high degree of confidence in its ability to repay. A BBB-rated issuer generally has to offer a higher coupon to attract investors. When a bond's yield looks unusually high compared with similar bonds, the credit rating is often the first place to look for an explanation.
Ratings aren't permanent
A rating is periodically reviewed and can be upgraded or downgraded as the issuer's financial position changes. Even if the issuer continues making all payments on time, a downgrade can cause the bond's market price to fall as investors demand a higher return for the increased risk. That's why it's worth keeping an eye on rating actions even after you've bought the bond.
Even FDs carry this risk — it's just not labelled
A bank could, in theory, fail to honour its obligations, and Deposit Insurance and Credit Guarantee Corporation (DICGC) insurance protects deposits only up to INR 5 lakh per depositor per bank. Larger and better-capitalised banks are generally viewed as safer than smaller or weaker institutions, reflecting the same underlying credit-risk principles that apply to bonds. The difference is that bonds make this risk explicit and measurable, whereas FDs often leave it in the background.
What this means for your bond selection
Credit rating is one of the three numbers that matter most when choosing a bond, alongside yield and tenure. A higher yield is only attractive once you've understood what level of credit risk you're being compensated for taking. For most investors, a well-diversified portfolio across multiple issuers is usually more resilient than concentrating too heavily on a single high-yield bond.