Debt mutual funds invest in fixed-income instruments: government securities, treasury bills, corporate bonds, commercial paper and certificates of deposit. They are often described as "safe", but that word hides a lot. Debt funds can and do lose value at times, and the type of fund you pick decides how much risk you take.
This article explains the main types of debt funds, the two risks that matter most, and how debt mutual fund taxation works for units bought after 1 April 2023.
How a debt fund earns returns
A debt fund earns money in two ways:
- Interest (accrual). The bonds in the portfolio pay interest, which adds to the fund's NAV every day.
- Price changes. Bond prices move when interest rates change or when a borrower's credit quality changes. These gains or losses also flow into the NAV.
Unlike a fixed deposit, there is no fixed rate promised. The NAV moves daily, and your return depends on what happens to the bonds the fund holds.
Main types of debt mutual funds
SEBI defines 16 debt fund categories. Here are the ones most people come across:
| Category | What it holds | Typical use |
|---|---|---|
| Overnight | Securities maturing in 1 day | Parking money for days |
| Liquid | Securities maturing in up to 91 days | Short-term parking, part of an emergency fund |
| Ultra short / low duration | Portfolio duration of roughly 3–12 months | Money needed within a year |
| Money market | Money market instruments up to 1 year | Short-term needs |
| Short duration | Portfolio duration of 1–3 years | 1–3 year goals |
| Corporate bond | At least 80% in the highest-rated (AA+ and above) corporate bonds | Medium-term goals with high credit quality |
| Banking & PSU | At least 80% in debt of banks, PSUs and public financial institutions | Medium-term goals |
| Credit risk | At least 65% in bonds rated below the highest grade | Higher yield, higher default risk |
| Gilt | At least 80% in government securities | No credit risk, but can be rate-sensitive |
| Dynamic bond | Duration changed actively by the manager | Depends on the manager's calls |
Target maturity funds are a separate, passive option. They track a bond index made of securities that mature around a fixed date — say, 2030 — and the fund itself winds up on that date. If you hold until maturity, your return will be close to the yield at which you invested (minus costs and tracking error), which makes them easier to plan around. If you exit early, you face market prices.
Interest-rate risk: why duration matters
When interest rates rise, existing bonds become less attractive, so their prices fall. When rates fall, prices rise. The sensitivity of a fund to these moves is measured by modified duration, which every fund publishes in its monthly factsheet.
A rough rule: a 1 percentage point change in interest rates moves the fund's NAV by about its modified duration, in the opposite direction.
Worked example.
- Fund A, a liquid fund, has a modified duration of 0.1 years.
- Fund B, a gilt fund, has a modified duration of 7 years.
If interest rates rise by 1 percentage point overnight:
- Fund A's NAV falls by about 0.1%, which a few days of interest income can make up.
- Fund B's NAV falls by about 7%. On a ₹5 lakh investment, that is a loss of roughly ₹35,000 on paper.
The reverse is also true: if rates fall, Fund B gains much more. That is why long-duration and gilt funds can look excellent in one year and disappointing the next.
Gilt funds carry no default risk, but they can be some of the most volatile debt funds because of their sensitivity to interest rates.
Credit risk: the borrower might not pay
Credit risk is the chance that a company whose bonds the fund holds is downgraded or defaults. When that happens, the bond's value can fall sharply, and the NAV drops with it.
Ways to gauge credit risk:
- Look at the credit rating breakdown in the factsheet (sovereign, AAA, AA, and so on).
- Check for concentration: a large holding in one issuer adds risk.
- Remember that higher yield usually means more risk. A credit risk fund's higher yield is a payment for taking that risk.
Overnight, liquid and gilt funds generally have very low credit risk; credit risk funds have the most.
Taxation of debt funds bought after 1 April 2023
Tax is where debt funds changed the most in recent years. The rules for FY 2025-26:
- Units bought on or after 1 April 2023: gains are taxed at your income tax slab rate, however long you hold the units. There is no long-term rate and no indexation benefit.
- Units bought before 1 April 2023: if held for more than 24 months, gains are long-term and taxed at 12.5% without indexation (for transfers on or after 23 July 2024). If held for 24 months or less, gains are taxed at slab rate.
- IDCW payouts are added to your income and taxed at slab.
This means debt funds and fixed deposits are now taxed similarly for new investments. The main tax difference left is timing: FD interest is taxed every year as it accrues, while debt fund gains are taxed only when you redeem. For details, read our guide to capital gains tax on mutual funds and shares. Tax laws change often, so check the current rules before you invest or redeem.
Where debt funds fit
- Emergency money: liquid or overnight funds can hold part of an emergency fund, alongside a savings account for instant access.
- Short-term goals: for money needed in one to three years, low-duration or short-duration funds can be considered.
- Portfolio stability: debt funds can balance equity holdings in a long-term portfolio.
- Gradual equity entry: a lump sum can sit in a liquid fund and move into equity through an STP.
Mutual fund investments are subject to market risks; read all scheme-related documents carefully.
Frequently asked questions
Are debt mutual funds safe?
They are generally less volatile than equity funds, but not risk-free. Interest-rate changes and credit events can reduce the NAV. Shorter-duration, high-quality funds carry the least risk.
How are debt funds taxed now?
For units bought on or after 1 April 2023, all gains are taxed at your slab rate regardless of holding period. Older units held over 24 months are taxed at 12.5% without indexation.
What is the difference between a liquid fund and an overnight fund?
An overnight fund holds securities that mature the next day, so it has almost no interest-rate or credit risk. A liquid fund holds securities maturing in up to 91 days, which can earn slightly more but with slightly more risk.
Do debt funds have an exit load?
Some do. Liquid funds have a small graded exit load for redemptions within seven days. Other categories vary, so check the scheme documents.
Key takeaways
- Debt funds earn from interest and from bond price changes; returns are not fixed.
- Duration drives interest-rate risk; credit quality drives default risk.
- Liquid and overnight funds suit short-term parking; longer-duration funds can be volatile.
- Debt fund units bought from 1 April 2023 are taxed at slab rate, regardless of holding period.
- Match the fund's duration to when you need the money.
If you would like to understand which debt categories suit your time frame, our team can walk you through the options on our investments page.
