Debt Funds Decoded: Navigating 16 Categories and the Risks That Matter
Debt funds are not all the same, and they are not all safe. Understanding duration, credit risk, and the 2020 Franklin Templeton episode can save you from a serious mistake.
When investors say "I want a safe option with better returns than FD," they usually end up in a debt fund. What they often do not realise is that debt funds carry two distinct risks that FDs do not: interest rate risk (NAV can fall when rates rise) and credit risk (the underlying bonds can default). Understanding these two risks is the entire key to navigating debt funds correctly.
The 16 SEBI-Defined Debt Categories
| Category | Duration / Maturity | Suitable For |
|---|---|---|
| Overnight | 1 day | Parking idle cash; ultra-short-term |
| Liquid | Up to 91 days | Emergency fund; STP source into equity |
| Ultra Short Duration | 3–6 months Macaulay | Short-term parking; beat savings rate |
| Low Duration | 6–12 months Macaulay | 6–12 month goals |
| Money Market | Up to 1 year maturity | Slightly better than ultra-short |
| Short Duration | 1–3 years Macaulay | 1–2 year goals; stable accrual |
| Medium Duration | 3–4 years Macaulay | Moderate rate sensitivity |
| Medium-Long Duration | 4–7 years Macaulay | Falling rate cycle play |
| Long Duration | Above 7 years Macaulay | Highest rate sensitivity; rate bet |
| Gilt | Only Government securities | Zero credit risk; pure rate play |
| Gilt 10-yr Constant Duration | Always 10-year tenor | Maximum rate sensitivity |
| Corporate Bond | Min 80% AA+ bonds | Accrual + yield pickup; quality credit |
| Banking & PSU Debt | Min 80% bank / PSU bonds | Safe accrual; liquid quality paper |
| Credit Risk | Min 65% below AA bonds | Higher yield; high credit risk |
| Dynamic Bond | Flexible — manager decides | Active rate management |
| Floater | Min 65% floating rate | Rising rate environments |
Interest Rate Risk: The Maths You Must Understand
Modified Duration measures how sensitive a fund's NAV is to changes in interest rates. The formula is simple: Modified Duration × 1% rate change = approximate NAV % change.
Duration risk in numbers
Short Duration fund (2.5 year duration): If RBI raises rates by 1%, NAV falls ~2.5% Long Duration fund (8 year duration): If RBI raises rates by 1%, NAV falls ~8% The inverse is also true: rate cuts cause equivalent NAV gains This is why long duration funds are only suitable when you expect rates to fall — not as a safe parking option
Credit Risk: Small Extra Yield, Catastrophic Downside
Credit risk debt funds invest in bonds rated below AA — they offer 0.5–0.75% higher yield than equivalent AAA bonds. This sounds attractive. The problem is that credit downgrades and defaults are asymmetric: the upside (extra 0.75%) is capped, the downside (complete write-off of the bond) is not.
The Franklin Templeton saga of April 2020 is the defining case study. Franklin wound up 6 debt schemes overnight, freezing approximately ₹28,000 crore of investor money — money that was supposed to be "safe" fixed income. The cause: illiquid credit bonds that could not be sold even at deep discounts during the COVID liquidity crisis. Investors recovered their money over 4–5 years, not the days a debt fund withdrawal is supposed to take.
Recommendation for most investors
Stick to Banking & PSU, Short Duration, Gilt, and Corporate Bond (AA+ only) for any meaningful allocation. Credit Risk funds should be avoided by retail investors — the incremental yield does not compensate for the tail risk.
Rate Environment Strategy
| Interest Rate Direction | Recommended Category | Why |
|---|---|---|
| Rising rates (RBI hiking) | Liquid / Ultra-Short / Floater | Low duration = low NAV impact; earn accrual |
| Falling rates (RBI cutting) | Long Duration / Gilt | Lock in high yields + NAV appreciation as bond prices rise |
| Uncertain / Neutral (current) | Short / Medium Duration, Banking & PSU | Stable accrual; manageable rate sensitivity |
| Any time for retail investors | Avoid Credit Risk | Asymmetric downside not worth extra 0.5–0.75% |
One Important Tax Change (Post April 2023)
Until April 2023, debt funds held for 3+ years qualified for long-term capital gains with indexation — a significant tax advantage over FDs. The Finance Act 2023 removed this: all debt fund gains are now taxed at slab rate, regardless of holding period. Debt funds and FDs now have equivalent tax treatment for most investors. The case for debt funds today is diversification, liquidity, and accrual returns — not tax efficiency.
This article is for educational purposes only. It does not constitute investment advice. Mutual fund investments are subject to market risks — please read all scheme-related documents carefully before investing.