Ultra-Short Duration Funds
Ultra-short duration funds, now officially called Ultra Short Term Funds, are debt mutual funds that keep their portfolio's Macaulay duration between three and six months, suiting short-term parking.
What Are Ultra-Short Duration Funds?
An ultra-short 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 3 months and 6 months.
These funds sit between liquid funds (maturity up to 91 days) and low duration funds (duration 6–12 months). They aim to earn a little more than very short-term options by taking slightly more interest rate and credit risk, while keeping volatility low.
How Do Ultra-Short Duration Funds Work?
- Portfolio construction: The fund holds a mix of money market instruments (T-bills, certificates of deposit, commercial paper) and short-maturity bonds.
- Duration band: The fund manager keeps the portfolio's Macaulay duration within 3–6 months. Individual securities can have longer maturities, as long as the overall portfolio stays in the band.
- Returns: Mainly from interest accrual, plus small price changes as market yields move.
- Rebalancing: As securities mature or rates change, the manager buys and sells to keep the duration within range.
- No InvITs: SEBI does not permit ultra-short funds to invest their residual portion in InvITs.
What is Macaulay duration?
Macaulay duration is the weighted average time (in years or months) until you receive a bond's cash flows (interest and principal), weighted by the present value of each cash flow. For a portfolio, it indicates how long, on average, the money is committed. A related measure, modified duration, estimates price sensitivity: price change ≈ −modified duration × change in yield. For short durations, modified duration is slightly lower than Macaulay duration. SEBI requires Macaulay duration to be explained in the scheme information document and stated at the portfolio level.
Practical Example
Kavita invests ₹3,00,000 in an ultra-short fund with:
- Portfolio Macaulay duration: 5 months (≈ 0.42 years)
- Modified duration: about 0.40 years
- Portfolio yield after expenses: assumed 7% a year
Scenario: Market yields rise by 0.75 percentage points overnight
- Approximate price impact = −0.40 × 0.75% = −0.30%
- Loss in value ≈ 0.30% × ₹3,00,000 = ₹900
Recovery through accrual
- Monthly accrual ≈ 7% ÷ 12 ≈ 0.58%
- On ₹3,00,000, that is ≈ ₹1,750 a month
So the ₹900 dip would be recovered in roughly two to three weeks of interest accrual (assuming yields stay stable afterwards), showing why short-duration funds are less affected by rate changes.
Why Are Ultra-Short Duration Funds Important?
- Short-term goals: Suit money needed in roughly three to six months or a little longer.
- Interest rate risk is low but higher than in overnight or liquid funds.
- Credit risk varies: Some funds hold only top-rated paper, while others take some lower-rated exposure to earn more. Check the portfolio.
- Tax: These funds invest more than 65% in debt and money market instruments, so 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 Term Fund (formerly ultra-short duration fund) |
| Duration rule | Portfolio Macaulay duration of 3–6 months |
| Instruments | Debt and money market instruments |
| InvITs in residual portion | Not permitted |
| Interest rate risk | Low |
| Credit risk | Low to moderate, varies by scheme |
| Exit load | Usually none or minimal; check the scheme |
Benefits and Limitations
Benefits
- Potentially higher returns than overnight and liquid funds over several months.
- Low sensitivity to interest rate changes.
- No lock-in; can be redeemed on any business day.
Limitations
- Returns are not guaranteed; NAV can dip when yields rise or a holding is downgraded.
- Credit risk can be higher in some schemes seeking extra yield.
- Gains on units bought from 1 April 2023 are taxed at slab rates.
- Less suitable for very short parking (a few days) than overnight or liquid funds.
Comparison With Related Concepts
| Category (official name) | Rule | Key difference | Practical implication |
|---|---|---|---|
| Liquid Fund | Maturity up to 91 days | Shorter instruments | Weeks to a few months |
| 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 | Can hold bonds | Around 3–6 months |
| Ultra Short to Short Term Fund (low duration) | Macaulay duration 6–12 months | Longer duration | Around 6–12 months |
| Short Term Fund (short duration) | Macaulay duration 1–3 years | Much more rate sensitivity | 1–3 years |
How Do Ultra-Short Duration Funds Apply to Mutual Fund Investors?
- Check duration and yield: The factsheet shows Macaulay duration, average maturity and yield to maturity (YTM).
- Check credit quality: Look at the share of AAA/A1+ and sovereign holdings versus lower-rated paper.
- Match your horizon: Aim for a holding period at least similar to the fund's duration.
- Watch the name change: After SEBI's 2026 rationalisation, schemes in this category may carry "Ultra Short Term Fund" in their names.
- Use for STP or emergency buffer layering: Some investors keep immediate needs in liquid funds and the next layer in ultra-short funds.
Common Mistakes and Misconceptions
- "Duration means how long I must stay invested." Correct view: duration measures the portfolio's interest rate sensitivity and cash-flow timing; there is no lock-in. Why it matters: you can redeem anytime, but aligning your horizon with duration reduces rate risk.
- "Ultra-short funds cannot lose money." Correct view: credit downgrades or defaults can cause sharp NAV falls, even in short-duration funds. Why it matters: credit quality is as important as duration.
- "All ultra-short funds hold only very short instruments." Correct view: the duration rule is at the portfolio level; individual bonds can be longer. Why it matters: read the portfolio, not just the category name.
- "Ultra Short Term Fund is a new type of fund." Correct view: it is the new official name of the same 3–6 month duration category. Why it matters: avoid confusion when comparing schemes after the renaming.
Important Terms to Know
- Debt Mutual Funds: Funds investing in bonds and money market instruments.
- Interest Rate Risk: Bond prices falling when rates rise.
- Credit Risk: The chance of an issuer defaulting or being downgraded.
- Liquid Funds: Funds with maturity up to 91 days.
- Low Duration Funds: Funds with Macaulay duration of 6–12 months.
- Money Market Funds: Funds holding money market instruments up to one year.
- Expense Ratio: The fund's annual cost.
Key Takeaways
- Ultra-short duration funds keep portfolio Macaulay duration between three and six months.
- Since SEBI's February 2026 circular, the official name is "Ultra Short Term Fund".
- They have low interest rate risk, but credit quality varies across schemes.
- Gains on units bought from 1 April 2023 are taxed at slab rates.
Related Glossary Terms
- Debt Mutual Funds
- Liquid Funds
- Money Market Funds
- Low Duration Funds
- Short Duration 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 see how duration shapes debt fund risk, explore our guides on Interest Rate Risk and Debt Mutual Funds.
Frequently Asked Questions
What is the duration rule for ultra-short duration funds?
SEBI requires these funds to invest in debt and money market instruments such that the portfolio's Macaulay duration is between three and six months. The rule applies to the overall portfolio, so individual securities can have longer maturities as long as the portfolio stays within the band.
Why is it now called Ultra Short Term Fund?
SEBI's circular dated 26 February 2026 revised category names to standardise terminology, renaming the category "Ultra Short Term Fund" while keeping the 3–6 month Macaulay duration band. Existing schemes had six months to align names and parameters, and such changes were not treated as fundamental attribute changes.
Are ultra-short duration funds safer than liquid funds?
Generally no. Liquid funds invest in instruments maturing up to 91 days, so they usually carry lower interest rate risk. Ultra-short funds take a little more duration and sometimes more credit risk to aim for slightly higher returns. Both are relatively low-risk categories.
Who may consider ultra-short duration funds?
Investors with money to park for roughly three to six months or a little longer, who want low volatility and can accept modest NAV fluctuations, may consider them. They can also serve as a layer after liquid funds in an emergency or short-term reserve.
How are ultra-short duration funds taxed?
They are specified mutual funds, as 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 rules or consult a tax adviser.
What should I check before investing?
Look at the portfolio's Macaulay duration, yield to maturity, credit ratings of holdings, expense ratio and any exit load. Also review the riskometer and potential risk class disclosed by the AMC to understand interest rate and credit risk levels.
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.