Corporate bond funds are debt mutual funds that mainly invest in bonds issued by companies. Companies borrow money by issuing bonds. In return, they agree to pay interest and return the borrowed amount according to the terms of the bond. A corporate bond fund buys a collection of these bonds.

SEBI requires a corporate bond fund to invest at least 80% of its total funds in corporate bonds rated AA+ and above. The remaining portion can be invested in other permitted debt and money market instruments.

The high credit rating requirement is an important part of this category. It means these funds focus on relatively high-quality corporate debt rather than deliberately taking large bets on lower-rated issuers, like credit risk funds.

However, these bonds can still lose value when interest rates rise. There is also some credit risk because even highly rated companies can face financial difficulties.

Corporate bond mutual funds can suit you if:

• You want a debt investment focused on highly rated companies: These funds must keep at least 80% of their assets in AA+ and above-rated corporate bonds. That makes credit quality an important part of this category.
• You have a medium-term goal: These funds are commonly considered for medium-term debt allocation. Your exact holding period should depend on the scheme's duration, risk profile and your financial goal.
• You want to add debt to an equity portfolio: If you have a SIP in a large-cap fund, flexi-cap funds or other equity schemes, a corporate bond fund can give you exposure to a different asset class.
• You don't want to take as much credit risk: Corporate bond schemes have a higher-rated bond requirement, unlike credit risk funds, which specifically invest a large portion in lower-rated corporate bonds.

When you invest in a corporate bond scheme via SIP or lump sum, the fund manager uses that money to mainly buy bonds. These bonds may be issued by banks, financial companies, manufacturing businesses and other eligible companies. You don't directly own each bond in the portfolio. Instead, you own units of the mutual fund.

Let's say you invest ₹10,000 when the fund's NAV is ₹20. You receive 500 units. Now imagine the bonds in the portfolio gain value and the NAV rises to ₹21. Your 500 units would then be worth ₹10,500. If bond prices move the other way and the NAV falls to ₹19.50, the same units would be worth ₹9,750.

The fund can earn interest from the bonds it holds. At the same time, changes in bond prices affect its NAV. Your return is therefore not fixed.

• You can spread your money across many issuers: Buying individual corporate bonds can require more research and a big sum of money. A mutual fund lets you access a portfolio of bonds with a single investment.
• Professional credit research: The fund manager monitors issuers, yields and market conditions. You don't have to assess every company bond yourself.
• Potential for income plus capital gains: Bonds can generate interest income for the portfolio. Changes in bond prices can also affect the NAV and contribute to returns.
• Useful as a middle ground within debt funds: These funds offer you more credit-quality focus compared to other debt schemes. But if you are looking for more allocation to safer government securities, you can explore gilt funds.

• Interest-rate risk can affect the NAV: When interest rates rise, existing bond prices generally fall. The impact depends on the duration of the fund's portfolio.
• Liquidity can become a problem: Some corporate bonds may not trade frequently. During difficult market conditions, selling them quickly can become harder.
• Concentration risk: A fund may have significant exposure to certain companies, sectors or groups. If the portfolio isn't diversified, the risk can be higher.
• Inflation can reduce your real return: Even when the scheme generates a positive return, high inflation can reduce the purchasing power of your money.
• Credit risk still exists: AA+ and above-rated bonds are considered higher-quality debt, but ratings can change. A downgrade or default by an issuer can hurt the fund.

Both categories invest in debt instruments, but their portfolios focus on different things. Here's a quick comparison:

If neither fits your needs, you can also consider other debt schemes such as short-duration funds, money market funds, credit risk funds, gilt funds or dynamic bond funds.

The best corporate bond mutual funds are not simply the ones with the highest recent returns. You should look at various factors before investing, such as:

• Check the credit ratings: Start with the portfolio. See how much is invested in AAA, AA+ and other eligible ratings. Also look for rating changes over time.
• Study the top holdings: Don't stop at the average credit rating. Check the biggest issuers in the portfolio. A large exposure to a single company can increase concentration risk.
• Look at the fund's duration: Two corporate bond mutual funds can have different interest-rate sensitivity. A fund with a longer duration can react more strongly when rates change.
• Compare rolling returns: Rolling returns show how the fund performed across multiple periods instead of using just one start and end date. This can give you a better picture of consistency.
• Compare expense ratio: Fund expenses come out of the scheme's assets. When comparing similar funds, costs are worth checking alongside performance and portfolio quality.
• Read the riskometer: Every mutual fund displays a riskometer. Use it to understand the risk level of the scheme.
• Check the exit load: Some schemes charge an exit load if you redeem within a specified period. Know the rule before investing.

Most importantly, don't choose a fund just because someone calls it one of the best corporate bond funds. Your goal, time frame and comfort with debt-market risk matter too.

Once you've picked the corporate bond fund to invest in, setting up a SIP on Millions takes a few simple steps on your smartphone:

• First, get the Millions app from Google Play Store or iOS App Store.
• Then create your free account by entering your mobile number and completing the KYC.
• After logging in, search through the list of handpicked mutual funds and select a corporate bond fund that fits your requirements.
• Tap 'SIP' and pick a daily, weekly or monthly frequency.
• Enter your investment amount, preferred date, then confirm the payment.

You don't need to begin with a big amount. What matters first is understanding what your chosen fund owns. Once you're comfortable with investing, you can explore other categories such as hybrid funds or index funds to start a new SIP. Each mutual fund category works differently, so always match your investment with the level of risk you can afford to take.