Credit Spread
The yield premium demanded by the market for a non-sovereign bond over a comparable-maturity Government Security (G-Sec), compensating investors for default risk, liquidity risk, and credit-rating uncertainty.
Definition
A credit spread is the difference in yield between a corporate (or quasi-sovereign) bond and a Government Security (G-Sec) of equivalent maturity and currency. It is expressed in basis points (bps), where 1 bps = 0.01%:
Credit Spread = YTM(Corporate Bond) − YTM(Benchmark G-Sec)
Credit spreads compensate bond investors for: (1) default risk — the probability that the issuer fails to pay coupon or principal; (2) liquidity risk — corporate bonds trade less frequently than G-Secs, so investors demand a premium to hold illiquid paper; and (3) uncertainty risk — even an AAA-rated issuer carries more cash-flow uncertainty than the Government of India. SEBI's ILDS Regulations 2008 require issuers to disclose credit ratings from at least two SEBI-registered Credit Rating Agencies (CRAs) — CRISIL, ICRA, CARE, India Ratings, or Brickwork — before listing corporate bonds on exchanges.
How it is computed
The benchmark G-Sec is selected by matching tenor: the 10-year G-Sec (currently GOI 7.26% 2033) is the standard benchmark for 10-year corporates; 5-year and 3-year G-Secs serve shorter-dated paper. NSE's India Bond platform and RBI's FBIL (Financial Benchmarks India Pvt. Ltd.) publish daily G-Sec par yields and OIS rates that serve as the clean risk-free reference. FBIL's T-Bill yield is used as the conventional 91-day T-bill yield (academic "risk-free rate" proxy) for very short-dated spread calculations. Credit spreads vary by: CRA rating (AAA spreads ~40–80 bps over G-Sec; BBB+ spreads ~150–250 bps; sub-investment grade much wider), sector (NBFC spreads tend to be 20–40 bps wider than equivalent-rated manufacturing firms post-2018 ILFS crisis), and tenor (typically wider at longer maturities due to cumulative default probability).
Why it matters for investors
Credit spreads are the primary lever for total-return enhancement in debt portfolios beyond duration. When spreads compress (narrow), existing bondholders earn capital gains on top of coupon income — this drove strong returns for credit-risk and corporate-bond funds during RBI easing cycles (2019–20, 2020–21). When spreads widen, NAVs fall even if G-Sec yields are unchanged. Key uses: (1) Fund category comparison — Credit Risk Funds (SEBI-defined: minimum 65% in below-AA bonds) deliberately exploit wide spread opportunities but carry higher volatility; (2) Corporate bond pricing — primary market issuers must clear the prevailing secondary-market spread or pay a new-issue premium; (3) Portfolio stress testing — a 50-bps sudden spread widening on a 5-year bond with MD 4.5 causes ~2.25% NAV decline, on top of any rate-driven duration loss.
Worked example
On a reference date, the 5-year G-Sec yields 7.15%. Three bonds of similar 5-year maturity trade as follows:
| Issuer | Rating | YTM | Spread over G-Sec |
|---|---|---|---|
| NABARD | AAA (Sovereign-guaranteed) | 7.52% | 37 bps |
| Bajaj Finance | AAA (Corporate) | 7.78% | 63 bps |
| Aditya Birla Finance | AA+ | 8.10% | 95 bps |
| Indiabulls Housing Finance | A | 9.60% | 245 bps |
The 58-bps gap between AAA corporate (Bajaj Finance) and the sovereign-guaranteed NABARD bond reflects pure corporate credit risk. The 182-bps gap between AA+ and AAA illustrates a single notch downgrade premium in a stressed NBFC sector environment.
Caveats
Rating cliff risk: CRA downgrades can cause spreads to gap wider overnight (e.g., IL&FS Sept 2018: spread from AA+ to default in weeks). Liquidity illusion: In stress periods, even AAA-rated bonds can see spreads widen 100+ bps simply due to liquidity flight, not default probability change. Callable/putable structures: Embedded options alter the spread vs. equivalent bullet bonds — use option-adjusted spread (OAS) for apples-to-apples comparison. Sector concentration: SEBI's debt mutual fund diversification norms (10% single-issuer cap) exist precisely to limit the impact of a single credit event on fund NAV.
See also
- Yield to Maturity (YTM)
- Callable Bond
- Yield Curve
- Debt Funds in India — Complete Guide
- Tax on Investments in India
Primary source
- SEBI ILDS Regulations 2008 / NCS Regulations 2021: sebi.gov.in — NCS Regulations 2021
- FBIL benchmark rates: fbil.org.in
- RBI G-Sec primary auction results: rbi.org.in
MintByte is registered with AMFI (ARN-314872) and APMI (APRN-01658). This glossary entry is for educational purposes only and does not constitute investment advice or a recommendation to buy or sell any security.