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mutual-funds · Last reviewed 2026-05-14

Overnight Fund

An Overnight Fund is a category of debt mutual fund in India that invests predominantly in debt and money market instruments with a maturity of just one day, aiming for high liquidity and minimal risk.

Understanding Overnight Fund

An Overnight Fund is a category of debt mutual fund in India that predominantly invests in debt and money market instruments with a maturity of just one day. Regulated by SEBI, these funds aim to provide high liquidity and capital preservation for investors seeking to park their surplus funds for a very short duration, typically a few days or weeks.

The portfolio of an Overnight Fund primarily consists of instruments like overnight reverse repos, tri-party repo (TREPS), and other money market instruments that mature on the next business day. Due to the extremely short maturity period, these funds are considered to have the lowest interest rate risk among all debt mutual funds, as the impact of interest rate fluctuations on their Net Asset Value (NAV) is minimal.

Returns in an Overnight Fund are generated primarily through the interest income earned on these overnight instruments. The NAV of an Overnight Fund typically moves up steadily each day, reflecting the accrued interest, with very little volatility. This makes them suitable for investors who need immediate access to their funds without significant risk of capital erosion.

These funds are a popular choice for corporate treasuries, high net-worth individuals, and retail investors who have idle cash for a short period and want to earn slightly better returns than a traditional savings bank account, while maintaining almost instant liquidity. They are classified by SEBI as "Overnight Funds: investing in overnight securities" under its mutual fund categorisation framework.

Why it matters

For an Indian investor, an Overnight Fund matters as it offers a highly liquid and low-risk avenue to park surplus funds for a very short duration, such as a few days or weeks. It can be a better alternative to a savings bank account for emergency funds or temporary cash holdings, potentially offering marginally higher returns while ensuring capital safety and easy access to funds, without the volatility associated with longer-duration investments.

Example

Numeric example

Suppose an investor, Aarti, invests ₹1,00,000 in an Overnight Fund on Monday. The fund's current annualised return is 3.5%. To calculate the approximate daily return: Daily return rate = Annualised return / 365 = 0.035 / 365 ≈ 0.00009589 Amount earned in one day = ₹1,00,000 * 0.00009589 = ₹9.59 So, Aarti's investment value would increase to ₹1,00,009.59 by the end of Tuesday. If the NAV on Monday was ₹100.00, the NAV on Tuesday would be approximately ₹100.00 * (1 + 0.00009589) = ₹100.009589. This calculation is illustrative and assumes a constant daily return. Actual returns may vary based on market conditions, and past performance is not indicative of future returns.

Rohan, a 28-year-old software engineer in Bengaluru, recently received a bonus of ₹75,000. He plans to use this money to pay his landlord his annual advance rent in about 10 days. Instead of letting the ₹75,000 sit idle in his savings account, which offers a low interest rate, he decides to invest it in an Overnight Fund. He knows the money is safe, highly liquid, and will likely earn a slightly better return over the 10 days compared to his savings account, without the risk associated with equity or longer-duration debt funds. When the rent payment is due, he can redeem his investment, usually receiving the funds in his bank account on the next business day, ensuring his capital is preserved and has earned a little extra.

How to use it

Overnight Funds are ideal for individuals and institutions looking to park surplus funds for a very short period, typically ranging from one day to a few weeks. They can be used for building an emergency corpus that needs to be highly liquid, holding funds for an upcoming large expense (like a down payment, tax payment, or loan EMI), or simply as a temporary parking spot for cash before deploying it into longer-term investments.

Investors can use these funds as a more efficient alternative to a traditional savings bank account for short-term cash management. They offer better liquidity than fixed deposits and generally lower risk than liquid funds, making them suitable for investors who prioritise capital preservation and immediate access to their money.

Common mistakes

  • ·Expecting high returns; these funds are for capital preservation and liquidity, not significant wealth creation.
  • ·Confusing them with Liquid Funds, which invest in instruments with slightly longer maturities (up to 91 days) and thus carry marginally higher interest rate risk.
  • ·Using them for long-term investment goals, as their returns are typically insufficient to beat inflation over extended periods.
  • ·Not understanding the tax implications; gains are taxed as per the investor's income tax slab if redeemed within three years (short-term capital gains).
Overnight Fund · last reviewed 2026-05-14
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