Gilt funds — pure interest-rate plays

Gilt funds invest at least 80% of their assets in government securities (G-Secs). Because the Indian government is the issuer, the credit risk is essentially nil — the central government has never defaulted on its rupee-denominated obligations. What remains is pure interest rate risk. Gilt funds are the cleanest mutual fund instrument for taking a duration view — gaining when rates fall, losing when rates rise.

SEBI's definition

• At least 80% of assets in government securities issued by central and state governments.
• No credit limits within G-Sec (all G-Sec is treated as same credit).
• Duration is at the fund manager's discretion.

A sub-category — "Gilt Fund with 10-year Constant Duration" — must maintain a Macaulay duration of approximately 10 years. This makes the duration position explicit and stable.

What G-Sec is

Government securities (also called gilts) include:

• Government of India dated securities (bonds with specified coupon and maturity).
• State Development Loans (SDLs) — bonds issued by state governments.
• Treasury Bills (T-Bills) for very-short-end exposure.

The Indian G-Sec market is among the deepest in emerging markets, supported by RBI's active management and substantial institutional participation.

Why no credit risk

The central government can always meet its INR obligations because:

• It can tax its citizens.
• RBI can act as lender-of-last-resort.
• It has its own currency.

State government bonds (SDLs) have a tiny implicit credit premium over central G-Sec but in practice are also treated as effectively risk-free.

Pure duration exposure

Without credit risk, all the volatility in a Gilt fund comes from interest rate movements:

Rate cuts

When RBI cuts the repo rate, market interest rates typically fall too. Bond prices rise. Long-duration Gilt funds can deliver 8-15% returns in a single year during major rate-cut cycles.

Rate hikes

When rates rise, bond prices fall. Long-duration Gilt funds can lose 5-10% in a sharp rate-hike cycle. The 2022-2023 RBI hiking cycle produced negative returns in long-duration Gilt funds.

Stable rates

When rates are flat, the fund earns just the running coupon (yield-to-maturity), typically 6.5-7.5%.

Interest rate sensitivity by duration

Direction: rate up → NAV down. Rate down → NAV up. Typical Indian Gilt funds run 5-8 year duration.

The 10-year constant duration sub-category

SEBI created this specifically for investors wanting consistent exposure to the long end of the curve:

• Always maintains approximately 10-year duration.
• Periodically rebalances as bonds approach maturity.
• Most predictable duration exposure.
• Highest interest rate sensitivity in the Gilt fund category.

Returns history

Indian Gilt fund returns vary dramatically by year:

• Strong rate-cut years (2019, 2020): 10-14% returns.
• Moderate years: 7-9%.
• Rate-hike years (2018, 2022): 0% to -3%.

The volatility is the trade-off for the credit safety and yield-curve play.

Where Gilt funds excel

Tactical rate plays

When you expect a rate-cut cycle, allocating to long-duration Gilt captures the price appreciation. A timely allocation before the 2019 rate cuts delivered 15%+ over 18 months.

Core safe portion of debt allocation

For investors who want absolute credit safety. The duration volatility is the cost; the safety is the benefit.

Diversification within debt

Different from corporate debt funds — Gilt return drivers (rate movements) are different from credit drivers. Adding Gilt diversifies the debt portfolio.

Where they don't excel

• Short-horizon goals: rate volatility can produce negative returns over 1-2 year periods.
• Stable income for retirees: the income (coupon) is stable but NAV swings can disturb the "stable" appearance.
• Risk-averse investors: the duration volatility may exceed expectations.

Tax treatment

Gilt funds are debt funds. Post-Finance Act 2023:

• Units bought on or after 1 April 2023: slab rate, regardless of holding period.
• Pre-April 2023 units: previous regime applies.

The post-2023 tax change eroded the tax appeal. For tax-favored allocation, equity-oriented funds (including hybrid and arbitrage) now compete.

How to position Gilt allocation

For rate cycle views

• Expecting rate cuts in the next 12-24 months → allocate to 10-year-duration Gilt.
• Expecting rate hikes → reduce Gilt allocation or shift to short-duration debt.
• No strong view → moderate 5-7 year duration Gilt for income.

Position sizing

• 10-25% of debt allocation as tactical Gilt position.
• 5-10% as permanent diversification component.
• Higher allocations for investors actively managing rate views.

The duration timing challenge

Predicting rate cycles is notoriously difficult. Most investors who try to time their Gilt allocations end up:

• Buying near the end of rate-cut cycles (after most gains).
• Selling near the bottom of rate-hike cycles (after most losses).

Long-duration buy-and-hold typically delivers better outcomes than frequent rate-based switching.

Comparison to other debt categories

Reading the yield curve

Gilt fund managers position along the yield curve based on their view:

• Flat curve (similar yields across maturities) → no strong duration preference.
• Steep curve (long bonds much higher yield than short) → opportunity for "carry" and "rolldown" by holding long bonds.
• Inverted curve (short higher than long) → unusual in India; signals expected rate cuts.

SDL exposure

Some Gilt funds hold significant State Development Loans (SDLs) — bonds issued by state governments. SDLs typically yield 25-50 bps more than central G-Sec for similar maturity, reflecting marginal credit premium and lower liquidity. AMCs vary in how much SDL exposure they take.

Operational notes

• Expense ratios: 0.30-0.80% for Direct plans.
• Standard SEBI cut-off times.
• NAV publication: daily.
• No exit load typical for Gilt funds.

The unique role

Gilt funds are the only major fund category where you get credit safety AND meaningful expected return variation. The variation comes from duration risk, which can be managed by matching your investment horizon to the fund's duration. Used thoughtfully, they're an important component of a diversified debt allocation.