Unrated bonds
Bonds carrying no current, valid rating from an external credit rating agency — more illiquid than rated bonds, and consequently priced to offer a higher yield.
In plain language
Most bonds bought by institutional and retail investors carry a credit rating — a rating agency's opinion, reduced to a symbol, on how likely the issuer is to pay on time. Unrated bonds are the opposite case: bonds with no current or valid rating by an external rating agency at all.
How it works
Because there is no independent, published opinion on the issuer's creditworthiness, unrated instruments are more illiquid than rated instruments of similar tenor — fewer investors are willing or permitted to hold them without that third-party check. That illiquidity, and the extra credit uncertainty, mean the yield on unrated instruments is higher than a comparable rated bond would carry, to compensate the investor for taking on both the unknown credit risk and the difficulty of exiting the position.
SEBI has issued specific guidelines governing mutual fund investment in unrated debt instruments, recognising that a scheme cannot simply treat an unrated bond as equivalent to a rated one of similar coupon.
A worked example
Two three-year corporate bonds are on offer, both from mid-sized manufacturing companies, both carrying a coupon linked to prevailing market rates.
| Bond | Rating | Indicative yield |
|---|---|---|
| Suvarna Industries NCD | AA (rated) | 8.2% |
| Konark Fabricators NCD | Unrated | 10.5% |
The 2.3 percentage point yield gap between the two is not a pricing anomaly — it is the market's way of compensating an investor for the absence of an independent rating and for the extra difficulty of selling the Konark paper if the investor needs to exit early. A mutual fund scheme considering the Konark NCD would need to satisfy SEBI's specific guidelines on mutual fund investment in unrated debt before it could be added to the portfolio.
Why NISM asks about it
Chapter 3, section 3.6.1 (Unrated Bonds), immediately after the standardised rating symbols tables. Expect a definitional question (no current or valid external rating) and a conceptual one on the direction of the yield effect (unrated bonds yield more, not less, because they are less liquid and carry unassessed credit risk).
Common exam traps
- Unrated does not mean default-risk-free or safe — it means the credit opinion has simply not been formed or published by an external agency; the underlying risk could be anywhere on the spectrum.
- Higher yield compensates for illiquidity as well as unassessed credit risk — do not attribute the entire yield premium to credit risk alone.
- Mutual funds face specific SEBI guidelines on unrated debt investment — an unrated bond is not automatically ineligible for a scheme, but it is not treated the same as a rated one either.
- Do not confuse an unrated bond with a bond carrying a provisional rating — a provisional rating is still a rating, pending some compliance step; an unrated bond has no rating opinion at all.
Where this is taught
- Series II-A · Chapter 3: Characteristics of Debt Securitiesintroduced here
- Series II-B · Chapter 3: Characteristics of Debt Securitiesintroduced here
Related terms
- Credit ratingAn opinion on how likely a borrower is to service an instrument on time, reduced to a symbol by a SEBI-registered rating agency — and reviewed continuously, not fixed for the life of the bond.
- Provisional ratingA credit rating marked "provisional" because some compliance or documentation is still pending — prefixed to the symbol on every rating letter, press release and rationale until resolved.
- Floating rate bondA bond whose coupon is not fixed but reset at intervals against a benchmark rate plus a stated mark-up — so the interest paid moves with market rates over the life of the bond.
- Corporate Fixed DepositA fixed-term deposit placed with a company, financial institution or NBFC rather than a bank, under Section 76 of the Companies Act — unsecured, leaving a defaulting company's depositor nothing to recover against.