Gilt Funds at a Glance

How Do Gilt Funds Work?

The flow behind a gilt fund is straightforward once broken into steps:

• The Central or State Government has a borrowing requirement to fund its expenditure.
• The RBI, acting as the government's debt manager, conducts auctions through which government securities are issued to the market.
• Banks, primary dealers, institutions and mutual funds — including gilt fund schemes — bid for and purchase these securities.
• The gilt fund's portfolio earns periodic coupon (interest) income, and the market price of the securities it holds changes as interest rates and yields move.
• These two effects together move the scheme's daily NAV.
• The investor's return is the change in NAV (plus any IDCW paid out) over the holding period, net of expenses.

To be precise: the RBI does not simply "borrow money and lend it to the government." It manages the government's market borrowing programme, thereby announcing the issuance calendar, conducting auctions, and operating the secondary market and settlement infrastructure while the actual lenders are the investors (including mutual funds) who buy the securities.

What Do Gilt Funds Invest In?

1. Central Government Dated Securities (G-Secs)

Issued by the Central Government, these are medium- to long-term instruments (commonly 5 to 40 years to maturity) that pay a fixed coupon. They form the largest part of most gilt fund portfolios and their value moves inversely with market interest rates.

2. Treasury Bills

Short-term Central Government instruments (91, 182 or 364 days) issued at a discount and redeemed at face value. Funds may hold these for liquidity management or when the strategy favours shorter maturities.

3. State Development Loans (SDLs)

Issued by State Governments to fund their borrowing programmes, SDLs work similarly to G-Secs but typically trade at a small yield premium. Some gilt fund mandates include them alongside Central Government securities.

4. Cash, Repo and Other Permitted Liquid Instruments

A small portion of assets may sit in cash, reverse repo or similar instruments to manage day-to-day redemptions and subscriptions without disturbing the core portfolio.

How Do Investors Earn Returns from Gilt Funds?

Mutual fund return is not the same thing as the coupon rate on the bonds or the prevailing market yield. Several elements combine to produce the investor's actual return:

• Coupon or interest accrual on the securities held by the scheme
• Mark-to-market changes in bond prices as yields move
• Realised gains or losses when the fund manager buys or sells securities within the portfolio
• Reinvestment of coupon income back into the portfolio
• Reduction for the scheme's expense ratio, which is deducted before NAV is computed

Under the Growth option, all of this is reflected in a rising (or falling) NAV. Under the IDCW (Income Distribution cum Capital Withdrawal) option, part of the gains may be paid out periodically, which reduces the NAV by the amount distributed.

Why Do Gilt-Fund NAVs Rise and Fall?

Bond prices and market interest rates generally move in opposite directions. A simplified illustration: suppose interest rates fall after a bond was issued at a higher coupon. New bonds now offer lower coupons, so the existing higher-coupon bond becomes relatively more attractive. Demand for it may rise, pushing up its market price — and, in turn, the gilt fund's NAV that holds it.

The reverse can also happen. If interest rates rise, newly issued bonds offer higher coupons, making older, lower-coupon bonds relatively less attractive. Their market price may fall, and the gilt fund's NAV may decline as a result.

This is a simplified illustration only, not a forecast or a guaranteed mechanism. Actual price movement also depends on the security's maturity, the portfolio's duration, shifts in the shape of the yield curve, market liquidity and the fund manager's positioning decisions.

What are Duration, Maturity and Yield?

These four terms are often used loosely but mean different things:

Analogy: Think of duration as how far a see-saw plank extends from its centre. A short plank barely moves when you push down; a long plank swings widely for the same push. A higher-duration gilt portfolio reacts more sharply to the same change in interest rates than a low-duration one.

What are the Different Types of Gilt Funds?

SEBI's mutual fund categorisation framework recognises two government-securities debt categories:

• Gilt Fund: invests a minimum of 80% of total assets in G-Secs across maturities, without a fixed duration mandate, giving the fund manager flexibility to adjust duration.
• Gilt Fund with 10-year Constant Duration: invests a minimum of 80% of total assets in G-Secs, with the portfolio's Macaulay duration maintained at around 10 years on an ongoing basis.

A 10-year constant-duration mandate is not the same as buying a single 10-year bond and holding it until maturity. As that bond ages and its remaining maturity shortens, the fund manager must keep replacing or rebalancing holdings so that the portfolio's overall duration stays close to ten years, which means the fund remains continuously exposed to interest-rate movements rather than "locking in" a fixed outcome.

What are the Potential Benefits of Gilt Funds?

• Very low sovereign credit risk in the domestic context, since the issuer is the government rather than a corporate borrower
• Exposure to a professionally managed, diversified portfolio of government securities without having to track auctions individually
• Potential benefit during periods of declining yields, when existing bond prices may rise — though this is not assured
• A useful building block for portfolio diversification within the debt allocation of a portfolio
• Liquidity typical of open-ended mutual funds, with redemption generally available on any business day
• Regulatory transparency, with mandatory disclosure of portfolio holdings, duration and other metrics
• A possible tactical or strategic role for investors actively managing duration within their broader asset allocation

None of these benefits make a gilt fund "safe," "stable" or "ideal" in an unqualified sense — each comes with the risks discussed below.

What are the Potential Risks of Gilt Funds?

1. Interest-Rate Risk

The most significant risk: NAV can fall when market interest rates rise, because existing bond prices generally move opposite to yields.

2. Duration Risk

Longer-duration portfolios amplify the impact of a given change in interest rates, in both directions.

Short-term NAV Volatility

Even within a generally favourable rate environment, NAVs can fluctuate over weeks or months due to changing expectations.

3. Reinvestment Risk

When coupons or maturing securities are reinvested at lower prevailing yields, future income may be lower than before.

4. Yield-Curve Risk

Shifts in the shape of the yield curve (not just its overall level) can affect different-maturity securities differently.

5. Liquidity or Market-Price Risk

Particular securities or maturities can occasionally see wider bid-ask spreads, affecting transaction prices during portfolio adjustments.

6. Inflation Risk

If inflation rises faster than the fund's return, the real, inflation-adjusted return can turn negative even when the nominal NAV is rising.

7. Fund-Management or Portfolio-Positioning Risk

Within the permitted mandate, a fund manager's duration or security-selection calls can affect relative performance versus peers.

8. Concentration in One Broad Issuer Category

Because the portfolio is concentrated in government paper, it offers little diversification away from sovereign interest-rate movements specifically.

9. Timing Risk for Lump-Sum Investors

A lump sum invested just before a sharp rate increase can see an immediate, if temporary, NAV decline.

10. Tax and Regulatory-Change Risk

Taxation rules, SEBI categorisation norms and other regulations can change, affecting future outcomes.

The absence of meaningful corporate-credit risk does not eliminate the possibility of negative returns — interest-rate movements alone can produce losses over certain periods.

Can Gilt Funds Deliver Negative Returns?

Yes. A gilt fund can post a negative return over a given period, even though the underlying issuer cannot realistically default.

This happens because a sharp and sustained rise in interest rates can push down the market price of the bonds in the portfolio by more than the coupon income earned during that period. The risk is generally greater over shorter holding periods, since there is less time for coupon income to offset any price decline. Longer-duration funds tend to react more sharply to the same change in rates than shorter-duration ones.

It is also worth noting that the fact a bond in the portfolio will eventually mature at face value does not protect an investor who redeems mutual fund units earlier — at that point, the investor receives the prevailing NAV, which reflects current market prices, not the eventual maturity value of individual bonds.

SIP vs. Lump-Sum Investment in Gilt Funds

SIP reduces single-entry-point risk by averaging across multiple NAVs, but it does not eliminate the underlying interest-rate or duration risk of the scheme itself.

How are Gilt Funds Taxed?

Tax rules verified as of 30 June 2026 for FY 2025-26 (AY 2026-27); please confirm current provisions before investing, since these can change.

Gilt funds fall under the "Specified Mutual Fund" definition in Section 50AA of the Income-tax Act, 1961, since they invest predominantly in debt and money-market instruments. This affects how capital gains are computed on redemption.

Key Takeaways

• A gilt fund is a debt mutual fund investing at least 80% of assets in government securities across maturities, regulated under SEBI's mutual fund categorisation framework.
• Sovereign credit risk (the chance of government default) is very low, but this is distinct from interest-rate risk, which can still cause meaningful NAV fluctuation.
• Duration is the key driver of interest-rate sensitivity — longer duration generally means larger NAV swings for a given change in yields.
• Gilt funds can deliver negative returns over certain periods, especially shorter ones during rising-rate phases.
• Suitability depends on matching the scheme's duration with the investor's goal and horizon, not on the label "government-backed" alone.
• Units acquired on or after 1 April 2023 are taxed at the investor's income-tax slab rate irrespective on redemption, with no indexation benefit.
• Evaluating a gilt fund requires looking beyond one-year returns to duration, YTM, expense ratio, drawdown history and consistency of strategy.
• SIP can smooth entry timing but does not remove the fund's underlying interest-rate or duration risk.

Final Thoughts

Gilt funds offer Indian investors a way to access government securities through a professionally managed, liquid mutual fund structure, with very low exposure to corporate-credit risk. That benefit, however, comes paired with genuine interest-rate and duration risk — the same government backing that makes default unlikely does not prevent the fund's NAV from declining when interest rates move against the portfolio. Deciding whether to research a gilt fund further should rest on your specific goal, time horizon, risk tolerance and how well the scheme's duration matches your needs, rather than on the comforting idea that "government-backed" automatically means risk-free.

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