Module 8   Currency, Commodity, and Government SecuritiesChapter 19

Government Securities

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19.1 – The new beginning

In a fascinating new development, NSE in collaboration with RBI has recently made it possible for retail investors to start investing in Government Securities, mainly the long-dated bonds and the treasury bills (T-bills).

These were products which were available only to banks and the large financial institution, but now we can invest in them and take advantage of attractive and guaranteed returns. However, since these are new financial instruments (at least to the retail participants), understanding the nuances before investing is important. For this reason, we have put the following conversational FAQs with a hope that you will be able to figure out the basics.

Do read on and post your comments below.

19.2 – FAQs on G-Sec


What am I investing in?

You are investing in Bonds/T-bills issued by the Government of India. Since the Government of India backs these, these are virtually risk-free investments. The guarantee from the Government is also called ‘Sovereign Guarantee’.

What are bonds/T-bills?? Tell me more.

Whenever you and I need money, we go to the bank to avail a loan. Against this loan, we promise to pay the bank periodic interest and also return the money after a certain amount of time. This is common practice, where the interest and principal are repaid to the bank.

Likewise, the Government of India also needs money to build roads, bridges, dams, hospitals, etc. When they run short of money, they approach their bank for a loan, which is the RBI. The RBI, in turn, auctions the loan in the form of bonds/T-bills that you can purchase. Essentially, you are lending a part of the overall loan the government is seeking.  Against this loan, the Government of India, promises to pay periodic interest and also repay the principal at the end of the tenure.

The loan which the government intends to repay within a year is called the Treasury Bills or T-bills. Loans which the Government intends to repay over many years are called the Bonds.

What should I choose? T-Bills or Bonds?

Both are great investments if you seek the safety of your capital. There are a few easy to understand variables that you need to look at before deciding on an investment in these two G-Sec instruments.

Variables like what? Start with T-bills, please.

There are three T-bills variants, and they vary based on the maturity period. They are 91 days, 182 days, and 364 days. T-bills do not carry an interest component; in fact, this is one of the biggest difference between T-bills and Bonds. T-bills are issued at a discount to their true (PAR) value, and upon expiry, it’s redeemed at its true value.

Woah! That sounds complex. Give me an example, please!

Ok, consider a 91-day T-bill. Assume the true value (also called the Par value), is Rs.100. This T-bill is issued to you at a discount to its par value, Say Rs.97. After 91 days, you will get back Rs.100, and therefore you make a return of Rs.3. Think of it; this is as good as buying a stock at Rs.97 and selling it after 91 days at Rs.100.  The only difference is that this is a guaranteed transaction, meaning, there is no risk of you selling below 100 (or above 100).

This sounds quite straightforward, is there anything else I need to know about T-bills?

That’s it pretty much. You need to remember that t-bills are issued at a discount to par, and upon maturity, you get the Par value. Of course, you can get a little technical and measure the yield of this investment if you want.

I’m all ears, let’s get technical!

Yield essentially measures the return on your investment on an annualized basis. After all, all investments should be measured by its returns on an annualized basis. So if you have made 3 bucks over 91 days on investment of Rs.97, then at this rate, how much would you have made every year?

The formula is –

Yield = [Discount Value]/[Bond Price] * [365/number of days to maturity]

= [3/97]*[365/91]

= 0.0309*4.010989


So in other words, the T-bill offers a return on investment of 12.4052%, but since you held it for 91 days, you will enjoy this return on a pro-rata basis.

Typical 91-day yields are around 6-7.5%. Needless to say, the higher the yield, the better it is.

What happens upon maturity of a T-bill?

Upon the maturity, the Government debits the T-bill from your DEMAT automatically, this is called ‘Extinguishment of Securities’ and the par value gets paid to the bank account linked to your DEMAT account.

Is that all about T-bills? Is there anything else that I need to know?

Nope, that’s it. You are all good to start 🙂

Alright, tell me how the bonds work.

Bonds differ from T-bills on 2 counts. Bonds have long-dated maturities, and they pay interest twice a year.

Sounds, interesting. Can you give me an example?

Every bond issued will have a unique name or symbol. The symbol contains all the information you’d need. For example here is a symbol – 740GS2035A, and here is what this really means –

Annualized interest – 7.40%

Type – Government Securities (GS)

Maturity – 2035

Issue – ‘A’  means it’s a fresh issue (don’t worry much about this, be aware that this is NSE’s internal nomenclature for their own book-keeping )

This issue is expiring in 2035 or 17 years from now (we were in 2018). If you were to invest in this bond, you would receive a 7.4% interest every year until its maturity in 2035. Please note, the interest will be paid semi-annually so that you will get 3.7% interest twice a year. Finally, upon maturity, you will also get back your principal amount.

Here are few more government security (GS) symbols –

Symbol Annualized Interest Semi-annual interest Maturity Year # years to Mature
662GS2051 6.62% 3.31% 2051 33
668GS2031 6.68% 3.34% 2031 13
737GS2023 7.37% 3.68% 2023 5

Can you give me an illustration to help me understand how much I earn if I were to invest in a bond?

Fair enough, but before we get into the details, you need to know one more thing.

Every bond has a Par value, of say Rs.100. When you invest in a bond, you usually invest either at a discount (ex: 98, 97 etc.) or par (100), or a premium to par (101,102 etc.). The price at which you invest in a bond depends on something called an ‘auction process’. More on that later, but for now, you need to be aware that you can invest in a bond at par, at a discount, or a premium.

Now, consider you invest in 700GS2020 (7% with a maturity of 2020 or 2 years from now) at a discount price of 98.4. Assume, you invested in 150 of these bonds, so you’d pay –


= Rs. 14,760/-

From the time you invest, the interest cycle starts. The interest is paid on the face value of the bond. The total amount you earn is as follows –

Time Period Interest Cash flow Remarks
0 – 6 Months 3.5% 3.5% * 100 * 150 = Rs.525 Half year interest
6 months  – 1 year 3.5% 3.5% * 100 * 150 = Rs.525 Half year interest
1 – 1.5 years 3.5% 3.5% * 100 * 150 = Rs.525 Half year interest
1.5 – 2 years 3.5% 3.5% * 100 * 150 = Rs.525 Half-year interest
At Maturity (2 years) Principal repayment at Par 150 * 100 = 15,000 Additional Rs.240

So on an investment of Rs.14,760/- you will earn –

525 + 525 + 525 + 525 + 15,000

= 2100 + 15,000

= Rs.17,100/-

If you do the math, the yield on this works out to approximately 7.88%. RBI has beautifully explained the calculation of yield here, do check this if you are keen to know more.

I’ve heard the term ‘ Yield to Maturity’, is this the same? 

Hmm, not really. The concept of ‘Yield to Maturity’ or YTM is a little tricky. The YTM calculation assumes that you reinvest the interest payment back into a similar bond, which further generates interest on interest. Bond traders and institutional investors only look at YTM because this is the true comparable value between two different bonds.

This is similar to reinvesting the dividends from a stock back into the stock.

Alright, tell me about the interest payment? How does it get paid?

The interest payment gets credited directly to your bank account linked to your DEMAT account, just like the way you receive the dividends from a company.

Can you give me some insights into the auction process?

Till recently, investment in G-Sec bonds/T-bills was restricted to banks and large financial institutions with a minimum ticket size of 5 Cr. However, recently NSE and RBI have opened it up to retail investors with a minimum of Rs.10,000/- investment.

However, the price you pay for the bonds is still decided by the banks and other major financial institutions. They place bids on RBI’s auction platform, and RBI decides the price of the bonds based on these bids placed on their platform. So the auction process is basically a process to discover the price you’d pay for the bond, also called the weighted average price of the bond.

So it is the weighted average price of the bond, the price I need to pay to purchase the bonds?

Yes and no.

At the time of placing your order, you pay a slightly higher amount. This amount is called the ‘amount payable’. Once all the orders are placed, the auction process starts and RBI evaluates the weighted average price. Any difference between the ‘amount payable’ and ‘weighted average price’,  is credited back to your account the very next day.

Wait for a second, what do you mean by ‘option to sell in secondary market’?

This works exactly like how you buy and sell stocks.

Let’s say you decide to invest in 740GS2035A. This means you will continue to enjoy a semi-annual interest payment of 3.7% every 6 months for the next 17 years, till 2035.

Now, after a few years, you no longer wish to hold this bond. In such an event, you can decide to sell this bond in the secondary market, pretty much like how you buy and sell stocks on NSE.

Check this post on TradingQ&A to know more about selling G-Sec in the secondary market.

Great! It looks like I’ve got my basics right. Is there anything else that I need to know?

Think of the whole thing as applying for an IPO followed by the stock getting listed on the exchanges. It’s pretty much the same. The auction process is like the IPO, and once the bidding is done, the Bond (or T-bill) will get listed on the exchange. You can sell the bond whenever you want, or you can even trade the bond once it gets listed!

The minimum ticket size if Rs.10,000/- and its multiples and a maximum of Rs. 2 Cr. You can place the orders when there are new auctions (just like an IPO). However, the good part is that RBI notifies the auction dates and schedule well in advance.

Here is the calendar for the upcoming t-bills auctions.

Here is the calendar for the upcoming bond auctions.

Here is the link of all the bonds that have been issued by RBI. Do pay particular attention to the nomenclature, coupon rate, and year of maturity.


What are SDLs?

To meet the budgetary requirements, State Governments also raise loans from the market, and these loans are called State Development Loans (SDLs). These loans are similar to the dated securities issued by the Central Government, the interest is credited half-yearly, and the principal amount is repaid at the time of maturity. SDLs also qualify for Statutory Liquidity Ratio (SLR), and they are also eligible as collaterals for borrowing through market repo as well as borrowing by eligible entities from the RBI under the Liquidity Adjustment Facility (LAF) and special repo conducted under market repo by CCIL. You may read this FAQ from RBI for more information. 

How does the Floatation and Yield of SDLs work?

RBI facilitates the issue of SDL securities in the Market, and the auctions are generally held every fort-night. These are traded electronically on the RBI managed NDS-OM (Negotiated Dealing System-Order Matching). Below is the snapshot of some securities floating for auction as on October 12th, 2020 on the NDS-OM managed by RBI. 

Like every other Government Security SDLs also have a unique name or symbol. For example, let’s take 05.75APSDL2024 Security from the above snapshot. And, here is what it really means:

Annualized Interest – 05.75 

State CodeAP (Andhra Pradesh in this case) 

Type – SDL

Maturity – 2024

This issue is expiring in 2024, i.e. 4 years from now (we are in 2020). If you were to invest in this bond, you would receive 5.7% interest semi-annually until maturity, which is 2024. Please note, similar to other G-Secs the interest for SDLs will also be paid semi-annually so that you will receive 2.8% interest twice a year. Finally, upon maturity, you will also get back your principal amount.

What about the Risk Assessment?

Unlike most G-Secs that have Implicit Sovereign Guarantee ( High Risk or significant funding cost advantages for the institutions that benefit from them), SDLs are associated under Explicit Sovereign Guarantee, which basically means, according to CRAR prudential norm released by RBI the risk accompanied with SDLs is weighted as zero. Banks are not required to keep any capital for investing in SDLs. Hence, making it the risk-free instrument to invest in than most of the other Central Government Securities. 

What about taxes?

Bonds – Interest income is credited to your bank account. It is considered as income from other sources and taxes have to be paid as per the income tax slab. If there is any appreciation in the bond price, it is considered capital gains. Long-term (LTCG) is 10% flat or 20% with indexation. STCG is as per the applicable slab rate.

T-bills – You buy at a discount and sell it at par. This appreciation is considered as short-term capital gain, and taxes as is per the applicable slab rate.

In the case of G-Secs, the gain is considered long-term (LTCG) if held for more than 3 years. Otherwise, it is short term capital gain (STCG).

Will I get assured allotment if I place my order?

These securities are issued for limited amounts, and there is no guarantee of allotment if the number of bids received is higher than the issue size. However, if you fail to get an allotment, you can try again next week. RBI carries out multiple issues a month.

This sounds good. How do I start?

Start Investing Now!

Happy investing!

Post your comments below.


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  1. Nikunj Purohit says:

    I did bit of research about 700GS2020 and similar names on NSE . I can only found bond futures trading on NSE that too with very low volumes. Also can you tell me ticker for T-bills or they will be available post 2018 Aug? Am I missing something?
    Also I have read in books that people invested in bonds during 2008 crash and still made money. Which script do they went for in Indian markets?

    • Karthik Rangappa says:

      Nikunj, yes at present only the bonds are listed. The actual bonds are yet to be listed, and NSE says they will be listed by August this year and I guess the trading symbol will be known around the same time.

      I have no idea about the 2008 bonds, Nikunj. But I’m not surprised at all. When there is fear in EQ markets, the bond markets tend to perform quite well.

    • Milind says:

      I want to buy old Gsecs (meaning Gsecs which were auctioned long back and have high interest rate) i don’t see any sellers do i know the Gsecs traded in the secondary market ? Maybe i can buy from those ?

  2. Gokul says:

    How to Actually invest in these securities ? Can we do this from our Dmat Account or there is any other way ?

  3. Kiran G says:

    Is interest earned on this bills and bonds are taxable ?

    • Karthik Rangappa says:

      Yes, they are taxable.

      • A J says:

        The article says that indexation benefit is available. How is that possible if we are getting paid interest semi annually?

        • Karthik Rangappa says:

          Indexation is on the capital appreciation i.e the difference between the price at which you buy the bond and the price at which you sell the bond. The interest income gets clubbed to your other income and you are taxed accordingly.

          • Sujeet Raj says:

            Hi Karthik, the price of the bond gets pulled to the par as time passes (if nothing else changes aka credit rating of the govt), hence shouldn’t we price the bonds (buy price) at it’s constant yield-price trajectory while selling and calculate our capital gains against this price so that it is amortized over it’s time period.

            Example for discount bond: We buy bonds @ Rs 95. After 2 years we sell @ Rs 98. But as per the constant yield trajectory, the price of the bond should be Rs 97. That means we have made capital gain of 98-97 = Re 1.

            This is what I studied for CFA. Not sure how Indian Tax laws interpret it.

          • Karthik Rangappa says:

            Sujeet, this is interesting, but I don’t think the taxation works on constant yield-price trajectory. I will verify and get back. However, when you hold the bond for more than 3 years, you can take the benefit of indexation (for capital gains), which works pretty much like the way you explained in the example.

          • Sujeet Raj says:

            Also, If we invest (from initial bidding)/buy at Rs 95 and hold till maturity, we will get Rs 100. Then this is the maturity amount which we are guaranteed to get. I don’t think this should be considered as Rs 5 capital gains. The constant yield-price trajectory supports this idea.
            Similarly, if it is a premium bond that we buy (say @Rs 105), we will still get Rs 100 at maturity. We shouldn’t be able to show this as capital loss.
            Please do verify and update us. Thanks a lot 🙂

          • Karthik Rangappa says:

            Sujeet, this is interesting, we will take the opinion from a tax consultant for this. Meanwhile, this is like the indexation way of treating capital gains. Maybe you should check this.

          • Sujeet Raj says:

            I guess India follows indexation rules then. Same as in debt MFs. Bit different. Sad that it will be considered STCG for T-Bills and bonds below 3 years and taxed. But it does make the calculations much easier.

            How is the 10% flat or 20% with indexation chosen for LTCG?

          • Karthik Rangappa says:

            This is like the debt mutual funds, Sujeet.

  4. Rohan says:

    Hey Kartik!
    I wanted to know whether there are any free paper trading platforms available online. Could you please help me out here.

    • Karthik Rangappa says:

      I’ve not really explored paper trading platform, Rohan…so cant really help you with this.

      • Raghu Vaishnav says:

        Hi Karthik Rangappa

        if we calculate the ytm for 91 days T bill ( at indicative yield of 6.93 % as shown on coin page ) ,
        then the result is around 29 % . Is this so good to be true ?
        It means that we can have almost 30 % return via investment in bonds alone (of course repeatedly investing upon maturity till 1 year ) ?

        • Karthik Rangappa says:

          YTM is on an annualized basis, Raghu. So 6.93% is for the entire year.

          • Sai Rikwith says:

            If annualized percentage is 6.93% for 91 days as given on coin website.
            Suppose i invested 10,000 then how it is calculated for 91 days and how much money will get into my trading account after 91 days.

          • Karthik Rangappa says:

            You will get 100 minus the allotment price after 91 days.

          • Soumitra Dev Burman says:

            Hi Karthik,

            I did not understand the comment you made “You will get 100 minus the allotment price after 91 days.” Can you please explain a little more?

          • Karthik Rangappa says:

            This line actually refers to the P&L, let us say the allotment price is 98, then the profit that you make will be 100-98 = 2. You will get this amount after 91 days.

  5. Bharat Gupta says:

    How can we invest in government bonds and securities on Zerodha ?

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