Money Market Funds: One Year Debt, Explained Simply
A money market fund is a SEBI defined debt category that invests only in money market instruments with a maturity of up to one year. That single rule sets the whole character of the product: short paper, low price volatility, and returns that track short term interest rates closely.
Money market instruments in the SEBI framework include treasury bills, certificates of deposit issued by banks, commercial paper issued by companies, commercial bills, tri-party repo and other instruments the RBI specifies, each with residual maturity within a year.
Think of it as the step above a liquid fund. Slightly more yield, slightly more movement in NAV, and money you do not need this week.
Where it sits among short term debt categories
| Category | SEBI definition | Typical use |
|---|---|---|
| Overnight fund | Securities maturing in 1 day | Idle cash, one to seven days |
| Liquid fund | Instruments maturing within 91 days | Emergency corpus, one to three months |
| Money market fund | Money market instruments up to 1 year maturity | Money needed in three to twelve months |
| Ultra short duration | Macaulay duration of 3 to 6 months | Three to six month parking |
| Low duration | Macaulay duration of 6 to 12 months | Six to eighteen month horizon |
Notice the difference in how the rules are written. Money market funds are defined by the maturity of the instruments they buy. Ultra short and low duration funds are defined by Macaulay duration, which is the weighted average time to receive a bond’s cash flows. A money market fund can therefore hold a 360 day certificate of deposit that an ultra short fund would find too long.
How the returns are generated
Almost all of the return is accrual. The fund buys, say, a 270 day bank certificate of deposit at a discount and earns the implied yield as the instrument moves towards maturity. There is no duration bet and no credit adventure in a well run scheme in this category.
As an illustration, if 364 day treasury bills are yielding somewhere near 6.8 percent and one year bank certificates of deposit yield a little more, a money market fund charging 0.20 percent in its direct plan would land in that broad neighbourhood over a full year. Those numbers are illustrative. Look up current yields and the scheme’s own yield to maturity in the latest factsheet.
Why the NAV can dip
SEBI requires debt securities to be valued on a mark to market basis rather than by simply amortising the purchase price. When short term yields spike, the value of existing holdings falls, and a money market fund can post a flat or slightly negative week. Accrual then pulls it back. Investors who watch daily returns often mistake this for something being wrong.
Risks that are real but small
- Credit risk: commercial paper is unsecured corporate borrowing. A downgrade or default hits the NAV directly, as several Indian debt funds learned in 2018 and 2019.
- Rate risk: limited, because everything matures within a year, but not zero.
- Liquidity risk: SEBI requires open ended debt schemes other than overnight and gilt schemes to keep a minimum portion in liquid assets such as cash, government securities, treasury bills and repo on government securities.
- No insurance: a mutual fund is not a bank deposit. There is no DICGC cover and no assured return.
Every debt scheme also publishes a potential risk class matrix that places it in a cell defined by maximum credit risk and maximum interest rate risk. For a money market fund you want a cell with low interest rate risk, and you should check whether the manager has taken on more credit risk than you expected.
Practical uses
- Money with a date: an insurance premium due in eight months, an advance tax instalment.
- The source of a systematic transfer plan: park a lump sum here and transfer a fixed amount into an equity fund every month.
- Second tier emergency money: the first tier sits in a savings account or liquid fund, the next tier earns a little more here.
Exit loads in this category are usually nil, but that is a scheme level decision, so confirm it in the scheme information document.
Tax follows the debt scheme rules. Those rules were changed from April 2023 and refined again afterwards for schemes investing predominantly in debt and money market instruments, so check the current provisions of the Income Tax Act before you redeem a large amount.
Frequently Asked Questions
Is a money market fund better than a savings bank account?
It has usually offered a higher yield than a savings account, at the cost of a NAV that can move slightly and money that takes a working day to reach you. Keep genuinely immediate cash in the bank and use the fund for the layer behind it.
Can a money market fund give a negative return?
Over a day or a week, yes, if short term yields jump or a holding is downgraded. Over a six to twelve month period a negative outcome would be unusual and would usually point to a credit event rather than rates.
How is it different from an arbitrage fund for short parking?
An arbitrage fund is taxed as equity and earns from the cash to futures spread, which varies with market conditions. A money market fund is a debt scheme with steadier accrual. The right choice depends on your tax slab and how predictable you want the outcome.
Do money market funds have a lock in?
No lock in applies to the category. Some schemes may levy a small exit load for very early redemption, so read the scheme information document before you invest a large sum for a short period.
Key Takeaways
- SEBI defines money market funds as investing in money market instruments maturing within one year.
- Returns are accrual driven and track short term rates such as treasury bill yields.
- Mark to market valuation means small NAV dips are normal, not a defect.
- Commercial paper brings genuine credit risk, so check the rating profile and risk class matrix.
- Suits money needed in three to twelve months, and is not a substitute for a bank deposit.
