What Are Corporate Bond Funds?

When companies need to borrow money for expansion, working capital, or refinancing existing debt, they have two primary options: go to a bank or issue bonds to investors. Corporate bonds are the second route. They are debt instruments issued by companies that promise to pay a fixed or floating rate of interest over a specified period and return the principal at maturity.

Corporate bond funds are mutual funds that pool investor money and invest it in a portfolio of such bonds. They sit in the middle of the debt fund risk spectrum: safer than credit risk funds that invest in lower rated bonds, and offering more yield than government bond funds that carry zero credit risk.

Understanding what corporate bond funds are, what they hold, what can go wrong, and when they are the right choice requires understanding the credit quality rules that define them.

Corporate bond funds are a distinct category under SEBI’s 2017 mutual fund categorisation circular. The defining regulatory requirement is that at least 80 percent of the fund’s total assets must be invested in the highest rated corporate bonds. SEBI specifies this as instruments rated AA plus or above. This single requirement is the most important thing to understand about the category, because it defines both the return potential and the risk profile of these funds.

The AA plus or above rating means the fund is legally required to concentrate its portfolio in bonds issued by companies that credit rating agencies have assessed as having the highest quality of debt. An AA plus rated bond carries a very low probability of default according to the rating agency’s assessment at the time of rating.

The rating hierarchy in India runs from D (default) at the bottom through C, B, BB, BBB, A, AA, and AAA at the top. AA plus and AAA are the two highest tiers. Corporate bond funds must hold at least 80 percent in these two tiers, which collectively represent the most creditworthy segment of India’s corporate bond market.

The remaining 20 percent can be invested in other debt and money market instruments, which gives the fund manager some flexibility. In practice, most corporate bond funds hold nearly all of their assets in AA plus and AAA rated bonds, using the 20 percent buffer sparingly and only for liquidity management purposes.

The average maturity of the portfolio is not mandated by SEBI for this category, which gives fund managers discretion over duration, and duration risk is therefore a variable that differs between funds within the same category.

The portfolio of a corporate bond fund consists predominantly of bonds issued by large, well established Indian corporates with strong financial profiles. In practice, the issuers tend to be a combination of large private sector companies, government owned enterprises, and financial sector entities including large non banking finance companies and housing finance companies. Because the mandate requires AA plus and above, the issuer universe is concentrated among the highest quality names in India’s debt market.

The bonds held can be of varying maturities, from short term paper with one to two years remaining to maturity to medium term bonds with three to five year maturities. The fund manager’s view on interest rate direction typically influences the average maturity of the portfolio.

A fund manager who expects interest rates to fall will tend to hold longer maturity bonds, because falling rates cause bond prices to rise and longer maturity bonds benefit more from this price appreciation. A manager who expects rates to remain stable or rise will tend to hold shorter maturity bonds to reduce the price sensitivity.

The specific instruments held include non convertible debentures issued by corporates, bonds issued by public sector undertakings, bonds issued by financial institutions, and in some cases perpetual bonds or subordinated debt from banks. Each holding is individually assessed by the fund’s internal credit team to ensure the issuer’s financial health justifies the rating. The monthly factsheet of any corporate bond fund will list the top holdings, average maturity, modified duration, and credit rating distribution, all of which are essential reading before investing.

Corporate bond funds carry two distinct types of risk, and conflating them leads to misunderstanding how the fund behaves. Credit risk and interest rate risk are different in origin, different in impact, and different in how they are managed.

Credit risk is the risk that an issuer of a bond held in the fund’s portfolio fails to pay interest or repay principal on time. Because corporate bond funds are required to hold at least 80 percent in AA plus and above rated instruments, the credit risk is intentionally low. AA plus and AAA rated issuers have historically had very low default rates in India. However, the keyword is historically, and rating agencies have been wrong before.

The IL&FS crisis of 2018 and several NBFC stress events between 2019 and 2021 showed that highly rated entities can experience rapid credit deterioration that outpaces rating agency downgrades. Several debt funds that held AA rated bonds in these entities saw sharp NAV declines when the credit quality deteriorated faster than the ratings reflected. Corporate bond funds, with their AA plus and above mandate, are better insulated than lower quality funds but not entirely immune if a significant issuer in the portfolio faces unexpected stress.

Monitoring the credit quality of a corporate bond fund’s portfolio requires looking beyond the headline credit rating distribution. The concentration of the portfolio in any single issuer, the diversity of sectors represented, and the proportion of perpetual bonds or subordinated debt (which rank lower in the capital structure and are more vulnerable in distress) all affect the actual credit risk more granularly than the average rating alone.

Interest rate risk is the risk that the market value of bonds in the fund’s portfolio falls when interest rates rise. All bonds, regardless of their credit quality, are subject to this risk. When market interest rates rise, the present value of a bond’s future cash flows falls, which reduces the bond’s price. The longer the maturity of the bond, the more sensitive its price is to interest rate movements.

This sensitivity is measured by the fund’s modified duration: a fund with a modified duration of 3.5 years will experience approximately a 3.5 percent fall in NAV for every 1 percentage point rise in interest rates, and approximately a 3.5 percent rise in NAV for every 1 percentage point fall in rates.

Unlike credit risk, which can produce permanent losses if an issuer defaults, interest rate risk is typically temporary. If interest rates rise and the bond’s NAV falls, holding the bond to maturity will ultimately return the principal and accrued interest as promised, provided there is no credit event.

The NAV decline is a mark to market effect, not a permanent impairment. However, an investor who needs to redeem during a period of elevated interest rates will crystallise that mark to market loss, which is why the holding period matters significantly for corporate bond fund investors.

Risk Type	Source	How to Manage It
Credit risk	Issuer fails to pay interest or principal.	SEBI mandates 80%+ in AA plus or above. Choose funds with diversified issuers and no excessive concentration in any single name.
Interest rate risk	Bond prices fall when market interest rates rise.	Choose funds with duration matching your investment horizon. A 3 year horizon investor should prefer funds with 2 to 4 year duration.
Liquidity risk	Difficulty selling bonds at fair value during market stress.	Larger funds with well known issuers have more liquid portfolios. Avoid funds concentrated in obscure or thinly traded instruments.

Corporate bond fund returns have two components. The first is the yield to maturity of the portfolio, which represents the return the fund would earn if every bond were held to maturity and all issuers met their obligations. The second is mark to market gains or losses from changes in bond prices as interest rates move.

In a falling rate environment, the portfolio appreciates beyond the yield to maturity as bond prices rise. In a rising rate environment, the portfolio may temporarily earn less than the yield to maturity as bond prices fall.

As of 2025 and early 2026, leading corporate bond funds have been delivering annualised returns in the range of 7.5 to 8.5 percent over a three to five year holding period. This is meaningfully higher than liquid funds at 6.5 to 7.3 percent and savings accounts at 2.5 to 4 percent, reflecting the additional duration risk and modest credit risk premium that corporate bond funds carry.

The yield advantage over government bond funds is the credit spread, which represents the additional return investors demand for accepting corporate credit risk relative to risk free government bonds.

Importantly, the returns are not guaranteed and can be negative in the short term during sharp interest rate rising cycles. In the calendar year 2022, when the RBI raised the repo rate by 190 basis points in response to inflation pressures, many medium to long duration debt funds including some corporate bond funds delivered negative returns for the year.

Investors who held through that period and continued to hold recovered and went on to earn positive returns as rates stabilised and eventually fell. But those who redeemed at the bottom locked in real losses.

Comparison Point	Corporate Bond Fund	Liquid Fund
Typical yield (2025 to 2026)	7.5 to 8.5% annualised	6.5 to 7.3% annualised
Source of yield advantage	Longer duration and corporate credit spread	No duration or credit risk premium
Volatility	Moderate. NAV can move up or down with rates.	Very low. Near straight line NAV growth.
Ideal holding period	2 to 4 years minimum	1 week to 3 months
Can deliver negative returns	Yes, in rising rate environments	Extremely unlikely. Near impossible.
Tax treatment	Slab rate on all gains post April 2023	Slab rate on all gains post April 2023

For investments made on or after April 1, 2023, all gains from corporate bond funds are taxed at the investor’s applicable income tax slab rate, regardless of the holding period. This change, introduced through Section 50AA of the Income Tax Act via the Finance Act 2023, removed the long term capital gains benefit and the indexation advantage that debt fund investors previously enjoyed after holding for more than three years. There is no distinction between short term and long term capital gains for corporate bond funds purchased from April 2023 onwards.

In practical terms, this makes corporate bond funds broadly equivalent to fixed deposits from a tax efficiency standpoint, since FD interest is also taxed at slab rate. The primary advantage of corporate bond funds over FDs is not tax efficiency but return potential: corporate bond funds can deliver 7.5 to 8.5 percent over a medium term holding period, which exceeds most bank FD rates for comparable tenures, and the returns are not locked in at a single rate but can benefit from capital appreciation when interest rates fall.

One strategic consideration under the current tax framework is using the annual Rs 1.25 lakh LTCG exemption from equity investments to offset the absence of a similar benefit in debt funds. Investors who hold a mix of equity and debt funds can structure their redemptions to harvest equity LTCG within the exemption limit each year, effectively reducing the overall portfolio tax burden even though the debt component carries no tax benefit of its own.

Corporate bond funds suit investors who have a medium term investing horizon of two to four years, want returns meaningfully higher than savings accounts or liquid funds, and are willing to accept moderate NAV volatility from interest rate movements while avoiding the credit risk of lower rated bond funds.

• Investors parking money for a goal that is two to four years away: a house renovation fund, a vehicle purchase corpus, or a goal with a defined medium term timeline. The holding period aligns with the duration risk of the fund, reducing the probability of redeeming during a temporary NAV dip caused by rising rates.

• Conservative investors who want better than FD returns without equity exposure: corporate bond funds have historically delivered 50 to 150 basis points more than comparable bank FDs over medium term holding periods. For investors who cannot accept equity volatility but find FD rates inadequate, they offer a genuine alternative.

• Investors who are using debt funds as the stable component of a larger portfolio that also includes equity: in a portfolio context, corporate bond funds provide the stability and yield that anchor the debt side, complementing the growth and volatility of equity funds.

• Investors who understand interest rate risk and are investing in a period when rates are expected to remain stable or fall: the additional duration risk in corporate bond funds compared to liquid or ultra short funds creates the most value when rates are falling or stable. Investing when rates are already high and expected to fall produces better total returns than investing when rates are low and may rise.

Given that corporate bond funds within the same category can differ significantly in portfolio construction, duration, and issuer concentration, evaluation requires looking beyond the category label.

• Credit rating distribution: confirm that at least 80 percent is in AA plus and AAA, as required. Check what proportion is in AAA versus AA plus, since AAA is a stronger credit quality and a higher proportion of AAA reduces credit risk. Also check whether any perpetual or subordinated bonds are present, as these carry additional structural risk.

• Modified duration: this tells you how much the NAV will move for a given change in interest rates. A fund with a modified duration of 3 years will fall approximately 3 percent if rates rise by 1 percent. Match this to your own view on rates and your time horizon. If you are investing for 2 years and rates may rise in the near term, a fund with a duration closer to 2 years is more appropriate than one with 4 to 5 year duration.

• Issuer concentration: if any single issuer accounts for more than 10 to 15 percent of the portfolio, the fund has meaningful single issuer concentration risk. A credit event at that issuer could cause a disproportionate NAV impact. Prefer funds with diversified issuers across multiple sectors.

• Expense ratio: since corporate bond fund returns are driven by yields that are largely similar across funds in the category, the expense ratio has a direct impact on net returns. A difference of 0.3 to 0.5 percent in expense ratio between a direct plan and a regular plan of the same fund, or between two similar funds, compounds materially over a three to four year holding period.

• Fund house track record in credit management: the 2018 to 2021 period exposed the difference in credit risk management quality across fund houses significantly. Fund houses that avoided or quickly exited stressed credits during that period demonstrated genuine credit discipline.

Reviewing a fund’s factsheets from that period, or checking whether any credit downgrades or defaults occurred in its portfolio, provides useful insight into the quality of the fund house’s credit analysis.

Corporate bond funds occupy a well defined and genuinely useful position in the debt fund spectrum. They are not the safest debt product available: that title belongs to overnight and liquid funds. But they are significantly safer than credit risk funds that reach into lower rated paper, and they offer a meaningful yield premium over pure government bond funds and savings accounts.

The premium exists because investors accept two sources of risk: the credit risk of corporate issuers relative to the government, and the interest rate risk of holding medium maturity bonds that are sensitive to RBI rate movements.

For the investor with a two to four year horizon who understands these risks and is investing in a rate environment where stability or falling rates are plausible, corporate bond funds offer a compelling risk and return profile within the debt fund universe. The slab rate taxation under the post April 2023 framework reduces their relative advantage over FDs on the tax dimension, but their return potential and flexibility remain genuine differentiators.

The key is to match the fund’s duration to your time horizon, verify the credit quality of the underlying portfolio, and hold for the full intended period rather than redeeming during temporary NAV dips caused by interest rate movements.

Disclaimer: This article is for educational purposes only and does not constitute investment advice. Corporate bond fund returns are market linked and not guaranteed. Credit ratings are not a guarantee against default. Tax treatment is based on the Income Tax Act as amended by Finance Act 2023 and is subject to change. Always read the Scheme Information Document and consult a SEBI registered financial advisor and a chartered accountant before investing.