Medium duration funds are debt funds that invest in debt and money market instruments. As per SEBI's classification, a medium duration fund must maintain a Macaulay duration of 3 to 4 years. This is longer than short duration funds, which have a 1-3 year range.

These schemes are useful if you can leave your money invested for a few years' time. This is because the fund's portfolio has a longer duration. Its NAV can react more to interest-rate changes than shorter-duration debt funds.

However, this doesn't mean that the fund will always give higher returns to compensate for the extra risk. Debt fund returns are market-linked. The value of your investment can be volatile depending on interest rates, bond prices, credit ratings and other market conditions.

Investing in this category of mutual fund scheme may make sense if:

• You can stay invested for 3 years or more: These funds have a 3-4 year portfolio duration. They're therefore more suited if you don't need your money right away. If your goal is much shorter, low duration funds or money market funds may be worth considering.
• You want debt exposure without a longer-term commitment: These funds sit between short-duration funds and long-duration funds. They can be a good choice if you want debt exposure but only for a few years.
• You are comfortable with changes in NAV: These funds are not designed to perform like a fixed deposit. Interest rate movements can affect their NAV, so you should be okay with seeing the value change during your investment period.
• You want to diversify your equity portfolio: If you already have an SIP in a large-cap fund, multi-cap fund or other equity-oriented funds, medium duration schemes can add suitable debt exposure.

When you invest in a medium duration mutual fund, your money is combined with money from other investors. The fund manager then uses this pool of funds to invest in different debt and money market instruments.

The fund's portfolio is managed to maintain a Macaulay duration of 3 to 4 years. The securities may generate interest income, while favourable changes in their market prices contribute to capital gains.

For you, as an investor, the fund's earnings are reflected in the NAV. For example, imagine you invest ₹10,000 when the NAV is ₹25. You would receive 400 units of the fund (₹10,000/₹25).

Now, suppose the fund earns interest and capital gains, and its NAV rises to ₹25.75. Your 400 units would then be worth ₹10,300 (400 units x ₹25.75), giving you a profit of ₹300.

But the NAV can also drop. If it falls to, say, ₹24.50, your 400 units would be worth ₹9,800, giving you a temporary loss of ₹200. This is why you should not treat a medium duration fund as a fixed-return product.

Here are various benefits of these debt mutual funds:

• Scope for interest income and price gains: The securities held by the fund can earn interest. Also, if the bond prices move favourably, that can support the fund's return.
• A middle option within duration-based debt funds: Medium duration schemes give you a choice between shorter-duration categories and funds that take on longer duration. This can be useful when your investment horizon falls somewhere in the middle.
• Portfolio diversification: A fund spreads your money across multiple debt securities rather than putting everything into one bond. The exact mix depends on the scheme's investment strategy.
• Professional portfolio management: You don't have to research and manage individual bonds yourself. The fund manager decides which securities to buy, hold or sell based on the scheme's mandate.

Some risks that you must consider before investing include:

• Interest-rate risk can be higher: Bond prices generally move in the opposite direction to market interest rates. Since medium duration funds have a 3-4 year duration, changes in rates can have a bigger impact on their NAV.
• Credit risk still exists: The scheme may hold securities issued by companies and other entities. If an issuer faces financial trouble or defaults, the fund can be affected.
• Returns are not guaranteed: A debt fund does not promise you a fixed interest rate. Even if a fund has delivered positive returns in the past, future returns can be different.
• Larger moves in the NAV: Compared to low duration funds or money market funds, a medium duration fund can be more sensitive to changes in interest rates.

While all these funds invest in debt and money market instruments, their portfolio duration sets them apart. Here's a quick comparison between them:

If your needs are different, you can also explore other debt schemes such as corporate bond funds, gilt funds or dynamic bond funds. The right category depends on the type of debt exposure you want.

While searching for the best medium duration mutual funds, don't start with the highest return number you can find. Check a few important things first, such as:

• Check the portfolio quality: Look at the securities held by the fund and the credit ratings of those securities. This gives you a better idea of the type of credit risk you are taking.
• Understand the duration: Every medium-duration fund follows the 3-4 Macaulay duration range, but the portfolio can still sit at different points within that range. This matters when interest rates move.
• Look at performance across different periods: You can check the fund's rolling returns. It tells you how the fund has performed over different sets of periods in the past and whether it has been consistent or not.
• Check the fund's concentration: See whether a large part of the portfolio is concentrated in a small number of issuers. A more spread-out portfolio can reduce dependence on any single issuer.
• Compare costs: Check the expense ratio and any applicable exit load. These costs reduce what you ultimately earn from the fund.

The best medium duration funds for you are the ones that match your investment horizon. For shorter durations, you can explore various other debt funds such as liquid funds, low duration funds or money market funds.

Getting started with a medium duration fund SIP on Millions takes only a few steps:

• Get the Millions app from the iOS App Store or Play Store.
• Register with your mobile number, verify your details and finish KYC to create a free account.
• In the mutual funds section, search for curated schemes and select a medium-duration fund that matches your investment needs.
• Tap SIP and choose whether you want to invest daily, weekly, or monthly.
• Enter the amount, pick your SIP date and authorise the first payment.

That's all! A medium-duration fund is more about giving your money enough time to work. If you're new to debt mutual funds, start with an amount you're comfortable investing regularly. Once you understand how debt schemes work, you can explore other options such as corporate bond funds, credit risk funds or 10-year gilt funds for longer-term investing.