Low Duration Funds
Low duration funds, now officially called Ultra Short to Short Term Funds, are debt mutual funds that keep their portfolio's Macaulay duration between six and twelve months, suiting goals around a year away.
What Are Low Duration Funds?
A low duration fund is a debt mutual fund that invests in debt and money market instruments such that the Macaulay duration of the portfolio is between 6 months and 12 months.
These funds sit one step above ultra-short duration funds (3–6 months) and below short duration funds (1–3 years). They aim for somewhat higher returns than very short-term categories, in exchange for slightly more sensitivity to interest rate changes.
How Do Low Duration Funds Work?
- Portfolio mix: The fund holds money market instruments (T-bills, certificates of deposit, commercial paper) and bonds issued by the government, banks, PSUs and companies.
- Duration band: The manager keeps the overall portfolio's Macaulay duration between 6 and 12 months. Some individual bonds may mature later, provided the portfolio stays within range.
- Return sources: Mostly interest accrual, plus price gains or losses as market yields fall or rise.
- Credit choices: The manager decides the mix of AAA-rated, sovereign and lower-rated securities, within the scheme's stated limits.
- No InvITs: SEBI does not allow this category to invest its residual portion in InvITs.
Macaulay duration, in simple terms, is the weighted average time until a bond portfolio's cash flows are received. The higher the duration, the more the portfolio's value reacts to interest rate changes. SEBI requires that Macaulay duration be explained in the scheme information document and stated at the portfolio level.
Practical Example
Deepak sets aside ₹4,00,000 for his child's school admission fees due in about a year. He compares two categories, assuming a sudden 1 percentage point rise in market yields:
| Ultra-short fund | Low duration fund | |
|---|---|---|
| Modified duration (approx.) | 0.40 years | 0.80 years |
| Price impact of +1% yield | −0.40 × 1% = −0.40% | −0.80 × 1% = −0.80% |
| Loss on ₹4,00,000 | ₹1,600 | ₹3,200 |
| Assumed annual yield | 7.0% | 7.4% |
| Expected accrual over 1 year | ₹28,000 | ₹29,600 |
Steps for the low duration fund:
- Price impact = −0.80 × 1% = −0.80%
- Loss = 0.80% × ₹4,00,000 = ₹3,200
- One year's accrual at 7.4% = ₹4,00,000 × 7.4% = ₹29,600
Over a one-year holding, the higher yield can more than offset the temporary price dip (₹29,600 − ₹3,200 = ₹26,400 approximately, versus ₹28,000 − ₹1,600 = ₹26,400 for the ultra-short fund in this example). In this illustration the outcomes are similar, showing that the extra yield is compensation for the extra rate sensitivity. Actual results depend on how yields move and on credit events.
Why Are Low Duration Funds Important?
- Fits goals about 6–12 months or more away, such as an upcoming fee payment, annual insurance premium or a planned purchase.
- Moderate interest rate risk: More sensitive than liquid or ultra-short funds, but much less than medium or long duration funds.
- Credit risk varies: Portfolio quality differs across schemes; some chase yield with lower-rated papers.
- Tax: As funds investing more than 65% in debt and money market instruments, they are "specified mutual funds". For units bought on or after 1 April 2023, gains are taxed at your slab rate regardless of holding period. Check the latest rules or consult a tax adviser.
Key Features
| Feature | Details |
|---|---|
| Official category name | Ultra Short to Short Term Fund (formerly low duration fund) |
| Duration rule | Portfolio Macaulay duration of 6–12 months |
| Instruments | Debt and money market instruments |
| InvITs in residual portion | Not permitted |
| Interest rate risk | Low to moderate |
| Credit risk | Varies by scheme |
| Exit load | Usually none or minimal; check the scheme |
Benefits and Limitations
Benefits
- Potentially higher yield than liquid and ultra-short categories.
- Lower volatility than longer-duration debt funds.
- No lock-in.
Limitations
- NAV can dip when interest rates rise, especially over short holding periods.
- Exposure to credit downgrades or defaults in some portfolios.
- Gains taxed at slab rates for units bought from 1 April 2023.
- Returns are not guaranteed.
Comparison With Related Concepts
| Category (official name) | Duration/maturity rule | Key difference | Practical implication |
|---|---|---|---|
| Money Market Fund | Money market instruments up to 1 year | Only money market instruments | A few months to a year |
| Ultra Short Term Fund | Macaulay duration 3–6 months | Shorter duration | Around 3–6 months |
| Ultra Short to Short Term Fund (low duration) | Macaulay duration 6–12 months | Middle of the short-term range | Around 6–12 months |
| Short Term Fund | Macaulay duration 1–3 years | Higher rate sensitivity | 1–3 years |
| Floater Funds | Mainly floating rate instruments (65%+) | Coupons reset with rates | Alternative when rates may rise |
How Do Low Duration Funds Apply to Mutual Fund Investors?
- Horizon matching: Prefer a holding period of at least the fund's duration, ideally a little longer.
- Read the factsheet: Check Macaulay duration, yield to maturity, average maturity and credit rating breakdown.
- Assess credit risk: A higher yield than peers often signals lower-rated holdings.
- Note the name change: Schemes may now carry "Ultra Short to Short Term Fund" in their name after SEBI's 2026 rationalisation.
- Compare costs: In a category where return differences are small, the expense ratio matters.
Common Mistakes and Misconceptions
- "Low duration means low risk in every way." Correct view: duration only measures interest rate sensitivity; credit risk is separate. Why it matters: a fund can have low duration and still hold risky papers.
- "Low duration funds are the same as liquid funds." Correct view: liquid funds are capped at 91-day maturity; low duration funds run 6–12 months of duration. Why it matters: low duration funds can show small negative returns over short periods.
- "Ultra Short to Short Term Fund is a new category." Correct view: it is the new official name of the low duration category, with the same 6–12 month band. Why it matters: avoid confusing it with the Ultra Short Term Fund (3–6 months).
- "I can pick the fund with the highest yield." Correct view: higher yield usually reflects higher credit or duration risk. Why it matters: yield alone can mislead.
Important Terms to Know
- Debt Mutual Funds: Funds investing in bonds and money market instruments.
- Interest Rate Risk: The effect of rate changes on bond prices.
- Credit Risk: The chance of default or downgrade.
- Ultra-Short Duration Funds: Funds with 3–6 month duration.
- Short Duration Funds: Funds with 1–3 year duration.
- Floater Funds: Funds investing mainly in floating rate instruments.
- Investment Horizon: How long you plan to stay invested.
Key Takeaways
- Low duration funds keep portfolio Macaulay duration between six and twelve months.
- SEBI's February 2026 circular renamed the category "Ultra Short to Short Term Fund".
- They carry low-to-moderate interest rate risk; credit risk depends on the portfolio.
- Gains on units bought from 1 April 2023 are taxed at slab rates.
Related Glossary Terms
- Debt Mutual Funds
- Ultra-Short Duration Funds
- Short Duration Funds
- Money Market Funds
- Floater Funds
- Interest Rate Risk
- Credit Risk
References
- SEBI circular: Categorization and Rationalization of Mutual Fund Schemes (26 February 2026)
- SEBI circular text (PDF)
- SEBI circular on revised Monthly Cumulative Report format (19 May 2026), listing the renamed debt categories
- Income Tax Department: Section 50AA, Income-tax Act, 1961 (specified mutual funds)
Educational Disclaimer
This article is published by FynnChintan Finserv, an AMFI-registered mutual fund distributor, for educational and informational purposes only. It is not personalised investment, tax or legal advice, and it does not recommend any specific scheme. Mutual fund investments are subject to market risks; read all scheme-related documents carefully. Regulations and tax rules change from time to time, so please check the latest SEBI and Income Tax rules, and consider your financial goals, risk profile and the scheme documents (or consult a qualified tax adviser) before making a decision.
To compare neighbouring debt categories, explore our guides on Ultra-Short Duration Funds and Short Duration Funds.
Frequently Asked Questions
What is the duration range of a low duration fund?
SEBI requires the portfolio's Macaulay duration to be between six and twelve months. The fund invests in debt and money market instruments, and individual holdings may mature later as long as the overall portfolio stays within the band.
What is an Ultra Short to Short Term Fund?
It is the official name SEBI gave to the low duration category in its circular dated 26 February 2026. The 6–12 month Macaulay duration rule did not change. It should not be confused with the Ultra Short Term Fund, which has a 3–6 month duration band.
Can low duration funds give negative returns?
Yes, over short periods. If interest rates rise sharply or a holding is downgraded or defaults, the NAV can fall. Over holding periods matching or exceeding the fund's duration, interest accrual usually offsets temporary rate-driven dips, though credit losses may not be recovered.
How long should I stay invested in a low duration fund?
A horizon of about six months to a year or more is generally suitable, matching the fund's duration band. For shorter needs, overnight, liquid or money market funds may fit better.
How are low duration funds taxed?
They are specified mutual funds because they invest more than 65% in debt and money market instruments. For units bought on or after 1 April 2023, gains are taxed at your slab rate regardless of holding period. Check the latest Income Tax rules or consult a tax adviser.
How do I judge the credit risk of a low duration fund?
Check the factsheet's rating breakdown, the share of sovereign and AAA/A1+ securities, concentration in individual issuers, and the potential risk class matrix that AMCs disclose. A noticeably higher yield than peers often signals higher credit risk.
This explanation is for general education only and is not investment advice. Mutual fund investments are subject to market risks; read all scheme-related documents carefully.