Dated G-Secs: Coupons, Maturity & Yield

What Exactly Is a Dated Government Security?

A dated government security is a debt obligation of the central government of India, distinguished from other government borrowing instruments primarily by its long tenor and the presence of a specific maturity date. The word "dated" in the name refers to this maturity date - the day on which the government repays the face value of the bond to the holder.

The most common face value (also called par value or nominal value) for Indian G-Secs is ₹100. Every characteristic of the security is expressed relative to this face value. If a G-Sec has a coupon rate of 7.26%, it pays ₹7.26 per year for every ₹100 of face value, typically in two equal semi-annual instalments of ₹3.63 each.

Tenors of dated G-Secs issued by the Government of India range from 2 years at the short end to 50 years at the long end, though the most common benchmarks are the 5-year, 10-year, 14-year, and 30-year securities. The 10-year G-Sec is considered the benchmark bond in India and its yield is quoted extensively in financial media as a proxy for the overall interest-rate environment.

Each G-Sec is identified by its coupon rate and maturity year in its name. For example, a security named "7.26% GS 2032" is a Government of India security with a coupon rate of 7.26% per annum maturing in 2032. The ISIN (International Securities Identification Number) assigned by SEBI provides the unique identifier used in trading and settlement systems.

It is important to distinguish dated G-Secs from Treasury Bills (T-Bills). T-Bills are short-term instruments with maturities of 91 days, 182 days, or 364 days, and they do not carry a coupon - they are issued at a discount to face value and redeemed at face value, with the difference being the investor's return. Dated G-Secs, by contrast, always have a coupon and a maturity of at least two years.

State governments also issue bonds - called State Development Loans (SDLs) - through a similar auction mechanism. SDLs carry a small spread over the corresponding G-Sec yield, reflecting the marginally higher credit risk of states compared to the central government, although both are considered sovereign-backed instruments.

The central government's dated G-Secs are issued under the Government Securities Act, 2006 and the Government Securities Regulations, 2007. The RBI is the debt manager and the registrar of these securities. Settlement of G-Sec trades happens on a T+1 basis in the NDS-OM system, and the securities are held in dematerialised form in the Subsidiary General Ledger (SGL) accounts maintained by the RBI or in Constituent SGL (CSGL) accounts, as well as in demat accounts at NSDL and CDSL for retail investors.

The Anatomy of a Coupon: How Interest Works on G-Secs

The coupon is the most visible feature of a dated G-Sec. It is the contractual interest rate fixed at the time of issuance and expressed as a percentage of the face value. Unlike bank fixed deposit rates, the coupon on a G-Sec does not change over the life of the security (for fixed-rate bonds) - it is locked in on the day of issue regardless of what happens to market interest rates subsequently.

In India, G-Sec coupons are paid semi-annually, on two fixed dates each year. For example, a security that was issued on 14 January would pay coupons on 14 January and 14 July every year until maturity. This is different from some global markets where annual coupon payments are the norm. The semi-annual schedule means investors receive a steady stream of cash flows rather than waiting a full year.

The coupon amount is calculated simply: Annual coupon = Coupon Rate × Face Value. Each semi-annual payment = Annual coupon ÷ 2. For a ₹10,000 face value holding in a 7.26% G-Sec, the annual interest is ₹726, paid as ₹363 every six months.

Beyond fixed-rate G-Secs, the Government of India has also issued floating-rate bonds (FRBs), where the coupon is linked to a benchmark - typically the average cut-off yield of 182-day T-Bills over a reference period - and is reset periodically. Inflation-indexed bonds (IIBs) are another variant, where the principal itself is adjusted for inflation (measured by the Consumer Price Index or Wholesale Price Index), so the coupon, though a fixed percentage, is applied to an inflation-adjusted principal. These variants provide hedges against interest-rate and inflation risks respectively, though they trade in a less liquid secondary market than vanilla fixed-rate G-Secs.

When a G-Sec changes hands in the secondary market between two coupon dates, the buyer must compensate the seller for the interest that has accrued from the last coupon date to the settlement date. This is called accrued interest, and the total amount paid by the buyer is the dirty price (clean price + accrued interest). Market convention and financial media typically quote the clean price; the actual settlement happens at the dirty price. Understanding this distinction matters when calculating your effective return on a secondary-market purchase.

Accrued interest in India is calculated on an actual/actual basis - that is, the actual number of days elapsed is divided by the actual number of days in the coupon period. This contrasts with the 30/360 convention used in some other markets. The precision matters when calculating costs for large institutional trades, but retail investors should at minimum understand that buying a G-Sec on a day after a coupon payment means they are effectively pre-paying the seller for interest already earned.

One nuance worth noting is the concept of ex-dividend dates. In Indian G-Sec markets, there is typically a one-day lock-in period before a coupon payment - buyers on that date will receive the coupon, but sellers will not. The practical implication for retail investors is that the price may behave slightly differently around coupon dates.

How G-Secs Are Issued: The RBI Auction Process

The Government of India announces its borrowing calendar at the start of each financial year (April), outlining the total amount to be borrowed through dated G-Secs over the year, typically split across two half-year tranches. The RBI issues a weekly auction notification detailing the security being issued or re-issued, the notified amount, and the auction date.

There are two main types of auctions for G-Secs: yield-based auctions and price-based auctions. In a yield-based auction, bidders quote the yield at which they are willing to buy, and the government accepts bids from the lowest yield upward (since a lower yield means higher price, the government prefers to borrow at the lowest cost). In a price-based auction, bidders quote a price for a security with a pre-announced coupon.

Within each auction type, there are two formats:

Uniform Price Auction (also called Dutch Auction): All successful bidders pay the same price - the cut-off price corresponding to the cut-off yield at which the government decides to stop accepting bids. This is the format used for most dated G-Sec auctions in India today.

Multiple Price Auction (also called French Auction): Each successful bidder pays the price corresponding to their own bid. This format was used historically and is still occasionally applied.

The cut-off yield established at the auction becomes the coupon rate for new issuances (for new securities) or determines the premium/discount at which a re-opened security is issued (for existing securities being re-opened). Re-opening is the practice of issuing additional amounts of a previously issued security with the same ISIN, coupon, and maturity date. Re-opening improves liquidity by concentrating trading in a smaller number of securities.

Primary Dealers (PDs) play a crucial role in G-Sec auctions. Recognised by the RBI, they are obligated to submit bids in each auction for a minimum percentage of the notified amount. PDs include entities such as standalone primary dealer firms and banks. Their mandatory participation ensures that the government's borrowing is fully subscribed even if other market participants hold back.

Retail and non-institutional investors can participate in G-Sec auctions through the non-competitive bidding (NCB) facility. Under NCB, small investors bid for a quantity (up to ₹2 crore per security per auction for individual investors) without specifying a yield - they simply receive allotment at the weighted average cut-off yield determined by the competitive bids. The NCB window is accessible through commercial banks, stock exchanges (NSE and BSE have facilitated NCB for retail investors), and the RBI Retail Direct platform.

After issuance, G-Secs enter the secondary market. The NDS-OM platform is the primary wholesale secondary market, where trades happen electronically between banks, PDs, and large institutions. Retail investors can access the secondary market through their demat accounts and broker platforms connected to NSE or BSE, or directly through the Gilt Account on RBI Retail Direct.

Understanding Yield: The Investor's True Return

The coupon rate tells you the interest the government has promised to pay on the face value. The yield tells you the actual return you will earn given the price you pay in the market. These two numbers are often different, and understanding why is central to understanding the entire bond market.

If you buy a G-Sec at exactly its face value of ₹100, and the coupon rate is 7.26%, your yield equals the coupon rate: 7.26%. But if the prevailing market interest rate rises after the bond is issued - say to 8% - new investors will want an 8% return. To attract them to the older 7.26% bond, its price must fall below ₹100 so that the fixed coupon payments represent a higher yield on the lower purchase price. Conversely, if interest rates fall to 6%, the old bond paying 7.26% becomes attractive, and investors will bid its price above ₹100, pushing the yield below the coupon rate.

This inverse relationship between bond prices and yields is the single most important concept in fixed-income investing: when yields go up, prices go down, and vice versa.

There are several yield measures used in the G-Sec market:

Current Yield: Annual coupon divided by current market price. For a 7.26% G-Sec trading at ₹98, current yield = 7.26/98 = 7.41%. This is a quick approximation but ignores the capital gain or loss at maturity.

Yield to Maturity (YTM): The most comprehensive yield measure. YTM is the single discount rate that equates the present value of all future cash flows (coupons plus face value repayment) with the current market price. It is effectively the internal rate of return (IRR) of holding the bond to maturity, assuming all coupon payments are reinvested at the same YTM rate. YTM is the standard yield quoted for dated G-Secs in India.

Yield to Call (YTC): Applicable for callable bonds, which give the issuer the right to redeem the bond before maturity. While not common for standard G-Secs, some special government bonds have had embedded options.

Hold-to-Maturity Yield: Conceptually the same as YTM if you actually hold to maturity and reinvest coupons at YTM. In practice, reinvestment rates will differ, creating reinvestment risk.

The daily YTM of the benchmark 10-year G-Sec is closely tracked by traders, economists, and policymakers. When the RBI changes the repo rate - its key short-term policy rate - it affects expectations about future short-term rates, which flows through the yield curve and affects G-Sec YTMs across all maturities. A rate hike typically pushes G-Sec yields higher and prices lower; a rate cut does the opposite.

For retail investors, the practical implication is straightforward: if you plan to hold a G-Sec to maturity, the YTM at your purchase price is your locked-in return (subject to reinvestment risk on coupons). If you might sell before maturity, you face market price risk - your actual return could be higher or lower than the YTM depending on where yields are when you sell.

The Yield Curve: Reading India's Interest-Rate Landscape

The yield curve is a graphical representation of the yields on G-Secs of different maturities at a single point in time. On the x-axis are the tenors (from 1 year to 40 or 50 years); on the y-axis are the corresponding YTMs. The shape of this curve tells investors and policymakers a great deal about current monetary conditions and expectations for the future.

A normal (upward-sloping) yield curve means longer-term bonds have higher yields than shorter-term ones. This is the typical shape and reflects the fact that investors demand extra compensation for the uncertainty and inflation risk associated with lending money for a longer period. India's G-Sec yield curve is usually upward-sloping.

A flat yield curve - where short-term and long-term yields are nearly equal - can indicate that the market expects interest rates to remain stable or that economic growth is expected to slow. Investors are not demanding much extra yield for extending maturity.

An inverted yield curve - where short-term yields exceed long-term yields - is relatively rare in India but has occurred during periods of very tight monetary policy. An inverted curve is often read as a signal of an impending economic slowdown, since markets are anticipating future rate cuts that will lower long-term yields.

The RBI publishes the Zero Coupon Yield Curve (ZCYC) derived from G-Sec prices, which is used as a reference for valuing debt securities across the financial system. Insurance companies, pension funds, and mutual funds all use G-Sec yield curves to mark their bond portfolios to market.

The spread between yields at different maturities has practical uses for investors. The 10-2 spread - the difference between the 10-year and 2-year G-Sec yields - is closely watched as an indicator of economic expectations. A widening spread suggests markets expect growth and inflation to pick up; a narrowing spread suggests the opposite.

Liquidity also affects the yield curve. The benchmark 10-year G-Sec trades with very tight bid-ask spreads and high daily volumes on NDS-OM. Off-the-run securities (older securities with the same approximate tenor) are less liquid and may trade at a slight yield premium to reflect this. Retail investors should be aware that buying illiquid off-the-run securities in the secondary market may come with wider bid-ask spreads, increasing transaction costs.

During periods of high government borrowing - which in India tends to coincide with periods of fiscal stress or large infrastructure spending programmes - the supply of long-tenor G-Secs increases, which can push long-end yields higher. This is sometimes called the "crowding out" effect, as government borrowing competes with private-sector borrowing for available funds, potentially keeping private-sector interest rates elevated.

For retail investors constructing a fixed-income portfolio, understanding the yield curve helps in deciding which tenor to focus on. Buying at the steep part of the curve (where you get meaningfully more yield for a small increase in maturity) can be efficient, while buying at the flat or inverted part of the curve may not reward you for the additional duration risk you are taking.

Bond Pricing: Why G-Sec Prices Fluctuate

Many new investors are surprised to learn that the price of a government bond - supposedly the safest investment - fluctuates every day. This fluctuation is not driven by credit risk (the government is not going to default on a domestic-currency obligation) but entirely by interest-rate movements. Understanding the mathematics of bond pricing clarifies why this happens.

The price of a bond is the present value of all its future cash flows, discounted at the current market yield. Mathematically:

Price = Sum of [Coupon / (1 + r/2)^t] + [Face Value / (1 + r/2)^T]

...where r is the current market yield (YTM), t is the coupon period number, and T is the total number of coupon periods. This formula makes the inverse relationship between price and yield mathematically explicit: a higher r in the denominator lowers each present value, reducing the total price.

Two concepts - duration and convexity - describe how sensitive a bond's price is to yield changes.

Duration (specifically Macaulay Duration) measures the weighted average time to receive the bond's cash flows, expressed in years. It is also a first-order approximation of price sensitivity: a bond with a duration of 7 years will lose approximately 7% of its value for a 1 percentage point (100 basis point) increase in yield, and gain approximately 7% for a 1 percentage point decrease in yield. This approximation is given by Modified Duration = Macaulay Duration / (1 + YTM/2) for semi-annual coupon bonds.

Convexity refines this approximation. In reality, the price-yield relationship is not linear but curved (convex). Convexity captures this curvature, meaning the actual price gain from a yield fall is slightly greater than duration predicts, and the actual price loss from a yield rise is slightly less than duration predicts. This asymmetry - gaining more than you lose for equal yield movements - is a desirable property of bonds and is sometimes called "positive convexity."

For long-tenor G-Secs (say, 30-year or 40-year bonds), duration is high - often 15 to 18 years. This means the price of a 30-year G-Sec can swing dramatically with relatively small changes in yield. A 1% increase in yield on a bond with modified duration of 16 would cause an approximate price fall of 16%. This is why long-tenor G-Secs are considered more suitable for sophisticated investors or long-term institutional holders who do not need to mark portfolios to market.

For retail investors with shorter investment horizons, shorter-tenor G-Secs (5-year, 7-year) offer much lower duration and hence lower price volatility, with a modest reduction in yield. The trade-off between yield and price stability is one of the most fundamental decisions in fixed-income portfolio construction.

In practice, the RBI and SEBI require mutual funds, insurance companies, and other regulated entities to mark their G-Sec portfolios to market daily using CCIL-published prices. This is why a long-duration gilt fund NAV can fall meaningfully on a day when bond yields spike - even though the government has not defaulted on anything.

Tax Treatment of G-Secs for Indian Investors

Understanding the tax implications of investing in dated G-Secs is essential for calculating your post-tax return. Indian tax law treats G-Sec income under two heads: interest income and capital gains. Specific tax rates and thresholds are subject to change with each Union Budget, so always refer to the latest Finance Act and consult a qualified tax adviser for your specific situation.

Interest Income: The semi-annual coupon payments you receive are taxed as interest income under the head "Income from Other Sources" at your applicable income tax slab rate. There is no Tax Deducted at Source (TDS) on G-Sec coupons paid to individual investors holding securities in demat form, but you are still required to declare the income in your Income Tax Return and pay advance tax if the liability exceeds prescribed thresholds.

Capital Gains: If you buy a G-Sec in the secondary market and sell it before maturity at a price different from your purchase price, the difference is treated as a capital gain or capital loss.

Short-term capital gains (STCG): If you hold the security for 12 months or less before selling, gains are taxed at your income tax slab rate.

Long-term capital gains (LTCG): If you hold the security for more than 12 months before selling, gains are taxed at a specified flat rate (without indexation benefit for listed securities). Refer to the latest Finance Act for the current applicable rates, as these have been revised in recent Budgets.

Where G-Secs are held to maturity, the face value redemption does not generate a capital gain or loss relative to face value - only relative to your purchase price. If you bought at ₹96 and receive ₹100 at maturity, the ₹4 is a long-term capital gain (if held more than 12 months).

Gilt mutual funds, which invest primarily in dated G-Secs, are taxed differently from direct G-Sec holdings - gains on mutual fund units are taxed as capital gains at rates applicable to debt funds. Refer the latest Finance Act for current rates, as the tax treatment of debt mutual fund gains has been revised multiple times in recent years.

For non-resident investors - including Foreign Portfolio Investors (FPIs) - interest income on G-Secs may be taxed at concessional withholding tax rates under applicable Double Taxation Avoidance Agreements (DTAAs) or under specific FPI exemption provisions notified by the government. The Fully Accessible Route (FAR) for FPIs to invest in specified G-Secs is governed by RBI and SEBI guidelines.

One tax-planning consideration: for investors in high tax brackets, the gross YTM of a G-Sec may be misleading. The post-tax YTM - which accounts for coupon taxation at the slab rate - may be lower than the post-tax return from tax-free bonds or certain other instruments. Comparing post-tax returns across investment options is critical for making informed decisions.

How Retail Investors Can Access the G-Sec Market

Historically, the G-Sec market was the preserve of banks, insurance companies, provident funds, and large institutional investors. Over the past decade, SEBI and RBI have taken deliberate steps to democratise access for retail investors. Today, there are several practical avenues.

RBI Retail Direct: Launched in November 2021, the RBI Retail Direct scheme allows individual residents to open a Retail Direct Gilt (RDG) account directly with the RBI at no charge. Through this account, you can participate in primary auctions (via the non-competitive bidding route) for G-Secs, T-Bills, SDLs, and Sovereign Gold Bonds. You can also buy and sell in a limited secondary market on the Retail Direct portal. This is the most direct route - there is no intermediary and no brokerage. However, the secondary market liquidity on the Retail Direct platform is more limited than on NDS-OM.

Stock Exchange Platforms (NSE and BSE): G-Secs are listed and tradeable on NSE and BSE. Retail investors can buy and sell G-Secs through their existing broker and demat account, just as they would trade shares. NSE and BSE have facilitated the non-competitive bidding window for primary auctions. The exchange-traded route is convenient for investors already comfortable with stock-market platforms and offers access to real-time prices. Brokerage and other transaction charges apply.

Gilt Mutual Funds: For investors who prefer professional management and high liquidity, gilt mutual funds invest predominantly in dated G-Secs and are regulated by SEBI. You can invest as little as ₹500 via the SIP route. The fund manager handles auction participation, secondary market trading, and portfolio management. However, the NAV of a long-duration gilt fund can be volatile due to interest-rate movements, and the expense ratio reduces net returns.

G-Sec ETFs: Exchange-Traded Funds (ETFs) that track G-Sec indices are available on NSE and BSE and can be bought like shares. They combine the low-cost and transparency benefits of passive investing with the diversification of holding a basket of G-Secs.

Corporate Bond Platforms and Brokers: Many full-service brokers and fintech platforms now offer curated G-Sec listings where retail investors can buy specific securities with minimum investment amounts starting from ₹10,000 or even ₹1,000 face value.

When choosing a route, consider: investment horizon (are you holding to maturity or might you need liquidity?), tax bracket (slab-rate coupon taxation affects net returns), ticket size (RBI Retail Direct and exchange routes suit smaller investments; NDS-OM is wholesale), and operational comfort (demat account holders may prefer the exchange route).

Regardless of the route, all G-Sec investments carry sovereign credit risk (near-zero for domestic-currency bonds), interest-rate risk (prices fluctuate with yields), and reinvestment risk (coupons may be reinvested at rates different from the original YTM). These risks are generally lower than equity market risks, but investors should understand them before committing capital.

SEBI regulates the conduct of stock brokers and mutual funds facilitating G-Sec investments, and RBI regulates the primary market and the overall G-Sec framework. Any grievance related to G-Sec transactions through brokers can be raised through SEBI's SCORES platform.

Special Types of Dated G-Secs

Beyond the plain-vanilla fixed-rate dated G-Sec, the Government of India has issued several specialised variants over the years, each designed to meet specific financing objectives or to appeal to particular investor segments.

Floating Rate Bonds (FRBs): These carry a coupon that resets periodically based on a benchmark yield, typically the average cut-off yield of recent 182-day T-Bill auctions. The reset mechanism means that if market interest rates rise, the coupon on FRBs also rises, protecting investors from the erosion of real income that can occur with fixed-rate bonds in a rising rate environment. FRBs are particularly attractive during periods of monetary tightening.

Inflation-Indexed Bonds (IIBs): IIBs link the principal to an inflation index - either the Consumer Price Index (CPI) or the Wholesale Price Index (WPI). The coupon rate is fixed, but since it is applied to an inflation-adjusted principal, the actual rupee coupon payment rises with inflation. At maturity, investors receive the inflation-adjusted principal (or the original principal, whichever is higher). IIBs are a hedge against inflation eroding the purchasing power of fixed-income returns.

Capital Indexed Bonds: An earlier variant of inflation protection where the principal repayment (but not the coupon) was indexed to inflation. These have not been issued in recent years, having been superseded by IIBs.

Special Securities: The government has at times issued special non-tradeable securities to specific institutions - for example, securities issued to oil marketing companies or fertiliser companies as compensation, or recapitalisation bonds issued to public sector banks. These are not available in the open market.

Sovereign Gold Bonds (SGBs): While technically a government security, SGBs are denominated in grams of gold rather than rupees and carry a fixed coupon on the issue price. They are a separate category with distinct features, maturity, and tax treatment (capital gains on redemption at maturity are tax-free for individual investors as per current provisions - verify the latest rules).

7.75% Savings Bonds (Discontinued): The government has previously issued taxable savings bonds for retail investors, which functioned like G-Secs but with a fixed rate and were not tradeable. These have been replaced by Floating Rate Savings Bonds (FRSBs), which carry a coupon linked to the National Savings Certificate (NSC) rate.

Each variant carries a different risk-return profile and suits different investor objectives. A comprehensive fixed-income portfolio may include a combination of these instruments calibrated to the investor's horizon, risk tolerance, and tax situation.

Example

Key benefits

How it works

1. 1
   Government Announces Borrowing

   The Government of India and the RBI publish a borrowing calendar at the start of the financial year, specifying the securities to be issued and the amounts. Weekly auction notifications detail the specific security, notified amount, and auction date.

2. 2
   RBI Conducts the Auction

   Institutional investors (banks, PDs, insurance companies) submit competitive yield bids; retail investors submit non-competitive bids for allotment at the weighted average cut-off yield. The RBI determines the cut-off yield and allots securities accordingly.

3. 3
   Settlement and Issuance

   Successful bidders pay the dirty price (clean price plus accrued interest) on the settlement date. Securities are credited to SGL accounts (for institutions) or demat accounts at NSDL/CDSL (for retail investors via brokers or RBI Retail Direct).

4. 4
   Coupon Payments

   Every six months on the scheduled coupon dates, the RBI credits the coupon amount directly to the bank account linked to the investor's demat or gilt account. No action is required from the investor to claim coupons.

5. 5
   Secondary Market Trading

   Investors wishing to sell before maturity can do so on NDS-OM (institutional), or on NSE/BSE (retail) at market-determined prices. The settlement is T+1; the buyer pays the dirty price and the security is transferred in demat form.

6. 6
   Maturity and Redemption

   On the maturity date, the Government of India repays the face value (₹100 per unit, or the inflation-adjusted principal for IIBs) directly to the holder's registered bank account. No action is required from the investor.

7. 7
   Tax Filing

   The investor declares coupon income under "Income from Other Sources" and any capital gain or loss from secondary market sales or maturity redemption in their Income Tax Return for the relevant financial year, paying tax at applicable rates.

Formula

Yield to Maturity (YTM) approximation: YTM ≈ [Annual Coupon + (Face Value - Price) / Years to Maturity] / [(Face Value + Price) / 2]

Exact YTM: Price = Σ [C/2 / (1 + YTM/2)^t] + [FV / (1 + YTM/2)^T], where C = annual coupon, FV = face value, t = coupon period, T = total coupon periods

Key takeaways

Frequently asked questions

Related terms