Quick Definition

Overnight funds are open-ended debt mutual funds that invest exclusively in safe money market instruments maturing in exactly one business day. They provide risk-averse investors with a highly liquid avenue to park surplus capital for ultra-short horizons with near-zero interest rate sensitivity.

What Are Overnight Funds?
How Do Overnight Funds Work?
Example of How an Overnight Fund Works
Key Features of Overnight Funds
How to Choose the Best Overnight Fund
Top Overnight Funds in India (2026)
Benefits of Investing in Overnight Funds
Risks of Overnight Funds
Taxation of Overnight Funds
Tips for First-Time Investors
Overnight Funds vs Liquid Funds vs Savings Accounts
Common Mistakes Investors Make With Overnight Funds
Who Should Invest in Overnight Funds?
Conclusion
Frequently Asked Questions

What Are Overnight Funds?

At its core, an overnight fund is a specialised debt mutual fund designed to protect capital. In the broader mutual fund ecosystem, most debt schemes buy bonds that mature over months or years. Overnight funds operate differently: by Securities and Exchange Board of India (SEBI) mandate, they are restricted to purchasing financial securities that mature the very next business day.

This category exists to solve a common problem for both retail investors and corporate treasuries, avoiding idle cash sitting unused. Instead of letting cash sit unutilised over a weekend or during stock market corrections, these funds pool your money to provide short-term collateralised loans to banks and financial institutions. By operating at the shortest end of the maturity spectrum, these funds act as a highly liquid investment option, yielding market-linked interest daily.

How Do Overnight Funds Work?

The daily lifecycle of an overnight fund follows a simple process. The fund manager invests the money through a continuous, repeating cycle each day.

Step 1: Collecting Investor Money: The asset management company collects investment amounts from retail investors and corporate entities via direct online transfers before the daily debt market cutoff window.

Step 2: Daily TREPS Investment: The fund manager combines all the invested money and lends it out on the Tri-party Repo (TREPS) clearing platform. This cash is borrowed overnight by top-tier banking institutions, backed 100% by high-quality government securities as collateral.

Step 3: Maturity and Repayment of Funds: At the start of the very next business morning, the banks and financial institutions return the money along with one day’s worth of accrued interest back into the mutual fund’s pool.

Step 4: Compounding and Reinvestment: The recovered principal and interest are combined. The fund manager immediately repeats the cycle, reinvesting the combined amount into fresh 24-hour instruments so the interest keeps compounding.

Example of How an Overnight Fund Works

Suppose Priya receives ₹2 lakh from selling some shares. She plans to invest the amount in an equity mutual fund next week. Instead of leaving the money in her savings account for five days, she parks it in an overnight fund. During those few days, the money earns a small market-linked return while remaining easily accessible when she needs it.

If you’re planning to invest a lump sum like this, it also helps to understand a few key considerations before investing a large amount.

Key Features of Overnight Funds

Invests only in one-day maturity securities: The fund can only buy instruments that mature the very next business day, keeping the portfolio as short-term as a debt fund can get.
Very low interest rate risk: Because holdings reset every 24 hours, the fund is barely affected by changes in interest rates.
High liquidity (generally T+1 redemption): You can redeem your units on any business day, with money usually reaching your bank account the next day.
No lock-in period: There’s no minimum holding period, so you can invest and withdraw whenever you need to.
Suitable for parking idle money: This makes overnight funds a practical option for short-term cash rather than long-term goals.

If your investment horizon extends beyond just a few days, comparing overnight funds with other short-term debt fund categories can help you choose the right option.

SEBI-regulated debt mutual fund category: SEBI classifies and monitors overnight funds under its mutual fund regulations, which set clear rules on what these funds can invest in.
Mostly invests through TREPS-backed instruments: Most overnight funds lend through the Tri-party Repo (TREPS) market, which is backed by government securities as collateral.

How to Choose the Best Overnight Fund

Since most overnight funds look nearly identical on paper (same instruments, same maturity structure), a few practical factors separate the better options:

Fund size (AUM): Prefer funds with a large Asset Under Management, ideally above ₹10,000 crore, since this reduces the impact of a few large investors suddenly withdrawing money.
Expense ratio: Since overnight fund returns are already thin, even a small difference in expense ratio matters. Leading funds typically keep direct plan expense ratios between 0.05% and 0.11%.
Track record: Check how consistently the fund has performed relative to its category average over different periods, rather than looking at just the most recent week or month.
AMC reputation: Established fund houses with strong risk management tend to run these portfolios more conservatively, which matters even in a low-risk category like this.
Portfolio quality: Check where the fund actually lends its money. Most reputable overnight funds lend almost entirely through TREPS, backed by government securities as collateral, rather than to less-regulated counterparties.

Top Overnight Funds in India (2026)

Fund Name	AUM (₹ Cr)	Expense Ratio (%)	1-Year Return (%)	Risk Level
SBI Overnight Fund	26,839	0.09	5.29	Low
ICICI Prudential Overnight Fund	10,066	0.10*	5.3	Low
HDFC Overnight Fund	9,991	0.11	5.3	Low
Aditya Birla Sun Life Overnight Fund	8,574	0.09	5.33	Low
Axis Overnight Fund	8,216	0.10*	5.4	Low
Nippon India Overnight Fund	6,785	0.10	5.35	Low
Kotak Overnight Fund	6,260	0.10*	5.3	Low

*Note: Expense ratios for some funds may vary slightly depending on the source and daily fluctuations. The listed ratios are typical for direct plans in this category, often hovering around 0.09% to 0.11%. Always verify with the AMC before investing.

Benefits of Investing in Overnight Funds

Better use of idle money for short periods
Easy entry and redemption
Suitable before STPs or lump-sum investments
Useful for emergency funds that may be needed soon
Minimal interest rate risk, since holdings reset every 24 hours
Can be suitable for businesses managing temporary surplus cash

Investors with a slightly longer investment horizon of a few weeks to three months may also consider exploring the best liquid funds in India for potentially higher returns.

Many investors first park money in an overnight fund before gradually transferring it into equity funds through a Systematic Transfer Plan.

Risks of Overnight Funds

While overnight mutual funds are designed to preserve capital with very low risk, they are not entirely risk-free.

Inflation Risk: The average yield on overnight funds tracks closely with the RBI repo rate (currently 5.25%). With returns hovering around this level, long-term investments in this category will lag behind real inflation or active equity returns.
No Fixed Return Guarantee: Unlike bank fixed deposits, overnight funds do not promise a predetermined future return; yields change based on interbank daily liquidity requirements.

Since debt fund taxation rules have changed in recent years, investors should also understand how debt mutual fund taxation affects their post-tax returns.

Tips for First-Time Investors

If you are transitioning your short-term reserves from a savings account to the best overnight funds category for the first time, keep these practical tips in mind:

Always Choose Direct Plans: Always opt for the Direct Plan – Growth version of the fund. Regular plans charge an ongoing commission to brokers, which can erode up to 10% of your daily yields over time.
Track the Daily Cutoff Window: Submit your online transaction requests before the official mutual fund transaction cutoff times on working days to ensure your cash is deployed into that same evening’s lending cycle.
Use AMC Instant Redemption Apps: Look for fund houses that offer an “Instant Redemption” feature, which allows you to instantly liquidate up to ₹50,000 or 90% of your total balance back into your bank account 24/7, even on public holidays.

Overnight Funds vs Liquid Funds vs Savings Accounts

To help you clarify exactly where to park short-term money in India 2026, this table breaks down how overnight funds stack up against immediate alternatives.

Feature Metric	Overnight Mutual Funds	Liquid Mutual Funds	Standard Savings Account
Maturity of Assets	Exactly 1 Business Day	Up to 91 Days Maximum	Immediate bank liability
Return Potential	Depends on overnight money market rates	Generally higher than overnight funds but varies	Fixed by the bank
Exit Load Penalty	Zero	Graded fee up to Day 6	None
Interest Rate Sensitivity	Near Nil	Low to Moderate	None
Principal Capital Safety	Extremely High (TREPS backed)	High (Commercial Paper)	DICGC insured up to ₹5 Lakh

Historical returns vary and should not be considered guaranteed. Check AMFI or fund house websites for current yield data before investing.

Common Mistakes Investors Make With Overnight Funds

Chasing Marginal Yields in Small Funds: Beginners often choose small overnight funds simply because their trailing returns look a fraction higher. In debt instruments, prioritise massive fund scale (AUM) over historical fractional returns to safeguard liquidity.
Using Overnight Funds for Long-Term Goals: Keeping capital parked inside an overnight strategy for months or years causes a severe opportunity cost loss compared to equity or corporate bond options.
Miscalculating Tax Outflows: Remember that capital gains are taxed at your marginal income slab rate. Factor this in when calculating your precise net portfolio yields.

Who Should Invest in Overnight Funds?

Overnight funds are ideal for active stock market traders who have closed out equity positions and want to earn steady interest on their cash margins before their next entry setup. They are also highly effective for self-employed professionals or retail investors holding temporary lump-sum allocations for upcoming near-term commitments like advance tax clearances, insurance premiums, or property payments due within a 1- to 7-day window.
Overnight funds can also form a part of an emergency corpus, although investors should compare them with other emergency fund investment options before making a choice.

Conclusion

Overnight funds can be a practical option for parking surplus money for a few days while maintaining liquidity. They are not meant for long-term wealth creation but can be useful for short-term cash management when chosen based on your investment needs.