Investment grade

Not every bond carries the same risk of the issuer failing to pay. Credit rating agencies grade that risk on a scale from AAA (the highest degree of safety, lowest credit risk) down to D (in default or expected to default soon). The XXI-A workbook groups this scale into two broad bond markets: investment grade, and non-investment grade, which it also calls the speculative bond market.

An investment-grade rating is, in effect, the market's shorthand for "a rating agency has assessed this issuer as reasonably likely to pay on time." It does not mean risk-free — even the workbook's top rating band, AAA, is described only as "lowest credit risk," not "no credit risk."

Chapter 4's Box 4.1 sets out the long-term rating scale a candidate needs: AAA (highest degree of safety), AA (high degree of safety, very low credit risk), A (adequate degree of safety, low credit risk), BBB (moderate degree of safety, moderate credit risk), then BB, B, C (increasing risk of default) and D (in default or expected to be soon). Modifiers of "+" or "−" can be added to AA through C to show standing within a band. A parallel scale in Box 4.2 rates short-term instruments from A1 (very strong safety) down to D.

The workbook states the investment-grade/non-investment-grade split exists but does not itself draw the line at a specific letter within this scale — it says only that bonds are classified "as investment grade and non-investment grade (speculative) bond market" based on the rating. A candidate should treat the rating scale (Box 4.1) and the fact of the split as workbook fact, and treat any specific cut-off letter given in a question as information supplied by that question.

Fund manager Deepak Sinha is choosing between two corporate bonds for a PMS client's fixed-income sleeve, each with a face value of Rs 10,00,000.

Company Y's higher 11.5% coupon compensates for a rating the workbook's own scale places well below AA — moderate risk of default rather than very low credit risk. If Deepak's mandate with this client restricts the portfolio to investment-grade paper only, the BB-rated Company Y bond is the one the mandate rules out, regardless of how attractive the extra 3.3 percentage points of coupon looks; the workbook's own rating definitions are the basis for that exclusion, not a market rumour about the issuer.

Chapter 4 (Investing in Fixed Income Securities) sets out the credit rating framework immediately after bond safety determinants, because rating is how the market prices default risk into a bond's yield. Questions typically ask a candidate to place a described issuer on the AAA-to-D scale, or to identify that a rating in the BB-to-D range signals higher default risk than one in the AAA-to-BBB range — using the descriptions in Box 4.1 rather than a memorised numeric threshold the workbook does not give.

• The workbook does not name the exact rating letter that divides investment grade from non-investment grade. Do not state a specific cut-off (such as "BBB and above") as a workbook fact — treat it as information a question would have to supply.
• Rating is given to an instrument, not to the issuing firm. The same company can have differently rated bonds outstanding at the same time.
• A higher rating means lower default risk, and a lower rating means higher credit risk — the direction is easy to reverse under exam pressure.
• "AAA" is the safest rating on the scale, not a guarantee of zero risk. The workbook's own wording for AAA is "lowest credit risk," not "no credit risk."
• The long-term scale (Box 4.1, AAA to D) and the short-term scale (Box 4.2, A1 to D) are different scales for instruments of different original maturity — do not answer a short-term-instrument question with a long-term rating symbol.