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NISM Series X-B · Chapter 10: Taxation of Debt Products

L1 · Foundation

Foundation — The two sources of income from debt, and the types of debt product

Why a debt instrument produces interest and capital gains but never a dividend or a vote, how interest is taxed under section 145, the coupon bond and its holding-period table, the four types of Government security and their very different tax treatments, and tax-free bonds where the interest is exempt but the capital gain is not.

26 min read · Worth 2% of the paper · Written from pages 204–223 of the official NISM workbook · Updated 11 September 2026

What a debt instrument is

Three things a debt holder does NOT get: voting power, a dividend claim, and any share in the upside. Two things he DOES get: interest during the term, and redemption value at maturity.

That single sentence dictates the whole of this chapter's tax treatment. Because there is no dividend, the dividend rules do not apply to bonds at all. Because there is interest and a redemption value, there are exactly two sources of income.

10.1 The two sources of income from debt products

SourceHead of income
Periodic income (coupon)Interest income — income from other sources (unless business income)
Gain or loss on transfer or redemptionCapital gains (if held as a capital asset)

Every debt question in this chapter is answered by first asking which of these two you are dealing with. Many questions ask for both in respect of the same instrument in the same year, and the two must be computed separately.

10.1.1 Interest income

This repeats Chapter 9's rule, and it repeats it because the accrual/receipt distinction does real work in debt problems. A half-yearly coupon paid on 30 June covers January to June — three of those months fall in the previous financial year. Under mercantile accounting the year-end split matters; under cash accounting it does not.

10.1.2 Capital gains

The FPI rule is a specific, examinable point. An ordinary investor's securities may be a capital asset or stock-in-trade depending on how he holds them. An FPI's securities are ALWAYS a capital asset — the question never arises, and an FPI can never report business income from securities.

And note the three factors the workbook names as driving the tax: NATURE OF SECURITY, PERIOD OF HOLDING, and RESIDENTIAL STATUS. Every row of the summary table at the end of this chapter is an application of those three.

10.2.1 Coupon bonds

Three principal features: MATURITY, COUPON, PRINCIPAL. And the naming convention is worth knowing — rate, issuer, maturity year, in that order.

Yield-to-maturity is defined here as the DISCOUNT RATE that equates the present value of all future cash flows to the market price. Note the direction of the definition — YTM is not a return you are promised; it is the rate implied by the price you pay.

Tax on interest arising from bonds

There is a bargain buried in that second paragraph, and it runs through the whole chapter: where a CONCESSIONAL RATE applies, DEDUCTIONS are withdrawn. You get the lower rate or the deductions, never both. Watch for the same pattern in dividend taxation for non-residents, and in Chapter XII-A.

Holding period and rates for coupon bonds — Table 10.1

Holding period to qualify as long termRate of tax
LISTED bonds or debentures12 monthsLong term: 12.5% (WITHOUT indexation benefit). Short term: applicable rates
UNLISTED bonds or unlisted debentures, OR MARKET LINKED DEBENTURESNOT APPLICABLEIRRESPECTIVE OF THE PERIOD OF HOLDING, gains arising on transfer will be considered as SHORT-TERM capital gains and will be taxed at APPLICABLE RATES

This table is the spine of the chapter. Two rows, and the difference between them is worth a great deal of money to a client.

Listed: a 12-month door to 12.5 per cent. Unlisted: no door at all.

The long-term computation for listed bonds

ParticularsRs
Full value of consideration (in case of transfer) or Redeemable Value (in case of redemption)xxx
Less: Cost of acquisition(xxx)
Less: Expenditure incurred wholly and exclusively in connection with transfer(xxx)
Less: Exemption under Sections 54EE to 54F(xxx)
= Long-term capital gain or lossxxx

Note there is no line for INDEXED cost. Table 10.1 says 12.5% WITHOUT INDEXATION BENEFIT, consistent with the Finance Act 2024 position that indexation survives only for land or building acquired before 23 July 2024.

10.2.2 Government securities

A clean examinable distinction: the CENTRE issues both; the STATES issue only dated securities, called SDLs. There is no such thing as a State treasury bill.

Why G-Secs are called risk-free

"Risk-free gilt-edged securities" is a phrase to remember. But note what is being claimed — no risk of DEFAULT. G-Secs still carry interest rate risk: their market value moves inversely with yields, which is why the workbook explains market value as the present value of future cash flows.

The four types

TypeTenorHow the return arises
a) Cash Management Bills (CMBs)Very short period, usually LESS THAN 91 DAYS. Highly flexible bills issued AS PER THE CASH REQUIREMENTS OF THE GOVERNMENTIssued at a DISCOUNTED PRICE and redeemed at FACE VALUE
b) Treasury Bills (T-Bills)Issued in 3 TENORS — 91 DAYS, 182 DAYS or 364 DAYS. Maturity DOESN'T EXCEED 1 YEARIssued at a DISCOUNTED PRICE. THESE BILLS DO NOT OFFER ANY INTEREST. The return is THE DIFFERENCE BETWEEN THE ISSUE PRICE AND THE REDEMPTION VALUE BEING THE FACE VALUE
c) Dated Government SecuritiesGenerally 5 YEARS TO 40 YEARSCarry a FIXED OR FLOATING COUPON paid on the face value, on a HALF-YEARLY basis. Issued by the RBI on behalf of the Government
d) State Development Loans (SDLs)Like dated G-SecsInterest serviced at HALF-YEARLY intervals and the principal repaid on the maturity date

Learn the three T-Bill tenors — 91, 182 and 364 days. Note that 364, not 365, is the longest. And note that CMBs are usually SHORTER than 91 days, which is what distinguishes them from T-Bills.

Taxability of CMBs and T-Bills — a surprising result

This catches people out. A T-Bill feels like a deposit — you put in Rs 97 and get back Rs 100 — and the gain feels like interest. It is not interest. It is a SHORT-TERM CAPITAL GAIN, because the instrument does not offer any interest at all; the whole return comes from the discount, which is realised on redemption or transfer.

And it can never be long term, because the maturity never exceeds one year.

Taxability of dated G-Secs and SDLs

So dated G-Secs and SDLs follow Table 10.1 — 12 months for long term, 12.5 per cent without indexation. But note from the summary table at the end of the chapter that UNLISTED dated G-Secs are treated as unlisted bonds, with no long-term door at all.

TDS on Government securities — section 193

Three layers to hold:

  1. General rule: NO TDS under section 193 on Central or State Government securities paid to a resident.
  2. Two exceptions: the 8% Savings (Taxable) Bonds, 2003 and the 7.75% Savings (Taxable) Bonds, 2018.
  3. Even for those two, TDS applies only where interest paid during the year EXCEEDS Rs 10,000.

Note the word "TAXABLE" in both bond names — it is part of the official title and signals exactly why they are the exceptions.

10.2.3 Tax-free bonds

And now the point that the name conceals:

"Tax-free" describes the INTEREST only. The capital gain is fully taxable.

This is one of the most commonly misunderstood products in Indian retail investing. An investor who buys a tax-free bond at Rs 120 and redeems at Rs 150 has:

ElementTreatment
The 5 per cent coupon each yearEXEMPT under section 10
The Rs 30 per bond gain on redemptionFULLY TAXABLE as a capital gain — 12.5 per cent if listed and held over 12 months

The name promises less than people hear in it. An adviser must say this explicitly, because clients routinely assume the entire return is untaxed.

Why the listed / unlisted distinction dominates this chapter

Pull the three rules together and the pattern is unmistakable:

InstrumentLong-term door?Long-term rate
Listed bond or debentureYes — 12 months12.5% without indexation
Listed dated G-Sec or SDLYes — 12 months12.5%
Listed municipal debt securityYes — 12 months12.5%
Listed tax-free bondYes — 12 months12.5% (and the interest is exempt)
UNLISTED bond or debentureNOAlways short term, at normal rates
UNLISTED dated G-SecNOAlways short term, at normal rates
Market Linked Debenture (even if listed)NOAlways short term, at normal rates
T-Bills and CMBsNO (maturity under a year)Always short term, at normal rates

For a taxpayer in the 30 per cent slab, the difference between 12.5 per cent and the normal rate is more than half the tax. That is why the listing status of a bond is not a technicality but the single most important tax fact about it.

Think of it like this

The lender and the owner — two seats at the same table

A family in Coimbatore starts a textile unit. Two outsiders put in Rs 10 lakh each.

The first takes SHARES. He becomes part-owner. He votes at the general meeting, he receives a dividend when profits allow, and if the business doubles in value, his stake doubles with it. If it fails, he may get nothing.

The second gives a LOAN, taking a debenture. He gets no vote and no dividend claim — the workbook is explicit that the debt holder would not hold any voting power or dividend claim. What he gets instead is interest during the term and the redemption value at maturity, whether the business triples or limps.

Now watch what follows for tax.

The shareholder can earn dividend (other sources, at slab rate) and capital gains on sale. The debenture holder can never earn a dividend at all — so the whole dividend apparatus of Chapter 9 is simply irrelevant to him. He earns interest while he holds, and capital gains when he sells or is redeemed.

Two sources, and only two. Every question in this chapter is answered by deciding which of the two you are looking at — and many questions demand both, computed separately, for the same bond in the same year.

The half-yearly coupon and the financial year — the milk bill that straddles March

A dairy in Nashik bills its customers twice a year, on 30 June and 31 December, for the six months just past.

The June bill covers January to June. But the financial year ended on 31 March. So three months of that bill — January, February and March — belong to the previous year, and three months to the current one.

This is exactly the workbook's Example 1. A 7.5 per cent bond paying half-yearly on 30 June and 31 December generates, for FY 2024-25:

Under MERCANTILE accounting — Rs 1,875 for April to June 2024, Rs 3,750 for July to December 2024, and Rs 1,875 for January to March 2025 which will only be received in June 2025. Total Rs 7,500 — a clean four quarters.

Under CASH accounting — Rs 3,750 received on 30 June 2024 and Rs 3,750 received on 31 December 2024. Total Rs 7,500 as well — but made up of different months.

Over the life of the bond both methods tax the same total. What differs is which year each slice falls into, and at the two ends of the holding — the first year and the last — the difference is real.

The test in every such problem is simple: under mercantile, ask which months the income BELONGS to. Under cash, ask which day the money ARRIVED.

T-Bills — the discounted cinema ticket that is not interest

A cinema in Madurai sells a Rs 100 ticket for Rs 97 if you buy it three months early. On the day of the show it is worth the full Rs 100.

Did the cinema pay you interest of Rs 3? It feels like it. But look at what actually happened: no payment of any kind was ever made to you. You simply bought something cheap and it became worth more.

That is precisely a Treasury Bill. The workbook is careful: these bills DO NOT OFFER ANY INTEREST to its investors. The return on a T-Bill is the DIFFERENCE BETWEEN THE ISSUE PRICE AND THE REDEMPTION VALUE being the face value.

And the tax consequence follows from that description: profit arising on redemption or transfer of these bills shall be considered as a SHORT-TERM CAPITAL GAIN, chargeable at the rates applicable to the assessee.

Not interest. Not income from other sources. A capital gain.

And it can never be a long-term capital gain, because a T-Bill's maturity is 91, 182 or 364 days — the instrument expires before the twelve-month door could ever open.

The same reasoning applies to Cash Management Bills, issued for usually less than 91 days as the Government's cash needs require.

Tax-free bonds — the free parking that charges for the exit

A mall in Hyderabad advertises FREE PARKING in letters three feet high. Drivers park happily. At the exit gate there is a barrier, and a small sign: exit fee Rs 60.

Nobody lied. Parking was free. Leaving was not.

That is a tax-free bond. The workbook says the interest paid on these bonds is TAX-FREE in the hand of the investor, exempt under section 10. And then, immediately: HOWEVER, THE CAPITAL GAINS ARISING ON TRANSFER OR REDEMPTION OF TAX-FREE BONDS SHALL BE CHARGEABLE TO TAX. The taxability of such capital gains is SAME AS IN THE CASE OF COUPON BONDS.

The workbook's own example makes it concrete. Mr X buys NABARD tax-free bonds at Rs 120, listed, carrying 5 per cent interest, redeemable at Rs 150.

  • The 5 per cent coupon: EXEMPT. No tax at all.
  • The Rs 30 per bond on redemption: a LONG-TERM CAPITAL GAIN of Rs 1,50,000 on 5,000 bonds, taxed at 12.5 per cent.

The adviser's duty here is to say the quiet part aloud, because retail investors hear "tax-free bond" and understand "tax-free investment." The name describes the coupon. It says nothing about the exit.

Listed and unlisted — two doors, only one of which opens

Two investors buy corporate bonds of the same issuer on the same morning, at the same yield. One bond is listed; the other is unlisted.

Five years later they both sell at a profit of Rs 3,20,000.

The listed investor walks to a door marked LONG TERM, held for more than 12 months, and pays 12.5 per cent — Rs 40,000.

The unlisted investor walks to the same wall and finds no door at all. Table 10.1 records it plainly: for unlisted bonds the holding period is NOT APPLICABLE, and irrespective of the period of holding, gains arising on transfer will be considered as SHORT-TERM capital gains taxed at APPLICABLE RATES. In the 30 per cent slab, Rs 96,000.

Rs 56,000 of difference on identical economics, decided by a single fact neither investor may have thought about at purchase.

This is the workbook's Examples 2 and 3, set side by side precisely to make the point: the same Rs 3,20,000 gain taxed at 12.5 per cent in one case and at slab rates in the other, the only variable being whether the bond was listed.

And the same wall has no door for Market Linked Debentures — even if listed — and unlisted dated G-Secs. The adviser must check this before the client buys, because afterwards nothing about the holding period can help.

The concessional rate bargain — the discounted fare with no free luggage

An airline offers two fares on the same flight. The full fare costs more but includes checked baggage, seat selection and a meal. The discounted fare costs much less and includes nothing — every extra is charged.

Run your eye through this chapter and you will find the same bargain over and over.

Bond interest at a concessional rate: the workbook says there are some cases where interest arising from bonds is chargeable at a CONCESSIONAL RATE and NO DEDUCTION (including deduction under sections 80C to 80U) is allowed from such interest income.

Dividend to a non-resident: taxed at 20 per cent rather than slab rates, but the assessee shall NOT be allowed to deduct ANY expenditure and Chapter VI-A deductions shall not be allowed even under the old tax regime.

Chapter XII-A for non-resident Indians: investment income capped at 20 per cent and long-term gains at 12.5 per cent, with no indexation benefit.

The pattern never varies: the lower the rate, the fewer the deductions. The Act is not being inconsistent — it is offering a package deal, and the taxpayer takes it whole or not at all.

Which is why, for a non-resident, comparing "20 per cent" against "slab rate" is never enough. You must compare the rate AND what it costs you in lost deductions.

The four categories of mutual fund — the sorting office with two dated bins

Until FY 2022-23 a post office in Kochi sorted parcels into two bins: equity-oriented funds, and everything else.

From FY 2023-24 the sorting office installed four bins, and two of them carry date stamps.

Bin 1 — Equity-oriented funds. Unchanged.

Bin 2 — Specified Mutual Funds Type 1. Funds investing 65 per cent or more in debt or money market instruments, directly or indirectly, bought after 1 April 2023. Everything in this bin is always short term.

Bin 3 — Specified Mutual Funds Type 2. Funds investing less than 35 per cent directly in equity shares of Indian companies, bought on or after 1 April 2023 BUT SOLD BEFORE 1 APRIL 2025. Gold funds, silver funds, international funds, fund of funds, debt-oriented hybrids. Also always short term.

Bin 4 — All other mutual funds. These keep the ordinary rules — 12 months if listed, 24 months if unlisted, then 12.5 per cent.

Notice that Bin 3 has a closing date stamped on it. A gold fund bought in June 2023 and sold in March 2025 goes into Bin 3 and is short term. The same fund sold in May 2025 goes into Bin 4 and can be long term at 12.5 per cent.

Two months of patience, and a completely different tax. The exam will date a sale either side of 1 April 2025 precisely to see whether you noticed.

DTAA — the shopkeeper who must be shown both price lists

A trader in Jaipur sells the same fabric under two price lists — the shop's own list, and a special list for members of a particular co-operative society. A customer who belongs to that society is entitled to whichever price is lower, but he must produce his membership card.

That is the DTAA position for a non-resident. Where a non-resident is eligible for DTAA benefits, he will be taxed at a rate mentioned in the relevant DTAA OR THE INCOME TAX ACT, WHICHEVER IS MORE BENEFICIAL TO HIM.

The workbook works it both ways, deliberately.

Interest for a US resident: Article 11 of the India-USA DTAA gives 15 per cent, against slab rates under the Act. The DTAA wins.

Dividend for the same US resident: the Act says 20 per cent and the India-USA DTAA says 25 per cent. "Since the rate as per the Income Tax Act is LOWER, Mr A can opt for the tax rate under the Income Tax Act." The Act wins.

Dividend for a UK resident: the India-UK DTAA provides 10 per cent. The DTAA wins again.

So the treaty is not automatically better — it is simply the other price list, and you compare.

And the membership card matters: to claim treaty relief the non-resident must obtain a TAX RESIDENCY CERTIFICATE of his country of residence and furnish FORM 10F, a self-declaration giving prescribed details. No card, no special price.

Key terms in this chapter

Accrued interest in sale consideration
Interest that has built up but not been paid when a bond is sold cum-interest. It is taxed as interest income and subtracted from the sale consideration before computing the capital gain, so the same rupee is not taxed twice.
Balanced or hybrid fund
A fund investing across equity, debt and money market instruments, with the proportions varying according to its return needs and risk appetite.
Cash Management Bill (CMB)
A very short-term Government instrument, usually of less than 91 days, issued flexibly as the Government's cash requirements demand. Issued at a discount and redeemed at face value.
Chapter XII-A
An optional concessional regime for non-resident Indian citizens or persons of Indian origin who invested in convertible foreign exchange while non-resident. Investment income is capped at 20 per cent and long-term gains at 12.5 per cent, with no indexation.
Chapter XII-A clawback
Where the new asset is transferred within three years of acquisition, the capital gains exempted earlier are taxed in the year in which that new asset is transferred.
Chapter XII-A reinvestment exemption
Where an NRI reinvests the net consideration from eligible assets within six months in eligible assets, the whole long-term gain is exempt if the entire net consideration is reinvested, or a proportionate amount if only part is.
Coupon bond
A bond carrying a coupon rate, entitling the lender to periodic interest payments. Its three principal features are maturity, coupon and principal.
Dated Government Security
A bond issued by the RBI on behalf of the Government, carrying a fixed or floating coupon paid half-yearly on face value, generally with a tenor of 5 to 40 years.
Debt instrument
An instrument similar to giving a loan to the issuing entity. The holder gets no voting power and no dividend claim, but is entitled to interest during the term and the redemption value at maturity.
Debt oriented fund
A mutual fund investing in debt securities or interest-bearing instruments such as government securities, bonds and debentures. Provides low return but is considered safe compared with equity funds.
Double Taxation Avoidance Agreement (DTAA)
A treaty under which a non-resident is taxed at the rate in the treaty or in the Income Tax Act, whichever is more beneficial to him. A treaty is not automatically better — the workbook shows the India-USA dividend rate of 25 per cent losing to the Act's 20 per cent.
Equity oriented fund
A mutual fund investing majorly in shares of companies. Categorised as high risk with a high return potential in the long run.
Exchange Traded Fund (ETF)
Any type of mutual fund whose units are listed on an exchange. ETF units are bought and sold on the stock exchange, whereas other mutual fund units are bought and redeemed through the Asset Management Company.
Foreign Portfolio Investor (FPI)
An investor whose securities are always treated as a capital asset, so income from their transfer or redemption is always taxed under capital gains and never as business income.
Form 10F
A self-declaration giving prescribed details, which a non-resident payee must furnish in addition to the Tax Residency Certificate to claim treaty relief.
Fund of funds
A fund that invests in other mutual funds, including equity, debt, liquid, hybrid, gold, silver and international funds.
Government Security (G-Sec)
A tradable instrument issued by the Central or a State Government acknowledging its debt obligation. Called risk-free gilt-edged securities because they carry the sovereign's commitment and practically no default risk.
IDCW
Income Distribution and Capital Withdrawal — the mutual fund dividend option. The name signals that part of what is distributed may be the investor's own capital returning.
Market Linked Debenture (MLD)
A security with an underlying principal component in the form of a debt security whose returns are linked to market returns on other securities or indices, including any security classified or regulated as an MLD by SEBI.
MLD issuer net worth
MLDs can be issued only by companies with a minimum net worth of Rs 100 crores, and are typically bought by high net worth or ultra high net worth individuals.
MLD tenure
Generally between 12 and 36 months. Unlike traditional debentures, MLDs pay no periodic interest — returns arrive only upon maturity as principal plus earned interest.
Money market or liquid fund
A fund investing in highly liquid instruments such as treasury bills and commercial papers, suitable for conservative investors placing surplus funds for a short term.
Other Mutual Funds
The residual mutual fund category, whose units are long term if held more than 12 months when listed or 24 months when unlisted, with long-term gains taxed at 12.5 per cent.
Principal Non-Protected MLD
An MLD that does not guarantee the return of principal at maturity, the coupon varying with the performance of the underlying asset.
Principal Protected MLD
An MLD that guarantees the return of the investor's principal at maturity regardless of the underlying asset's performance.
Prospective application (SMFs)
Section 50AA applies only to Specified Mutual Funds acquired on or after 1 April 2023. Units acquired on or before 31 March 2023 keep the ordinary treatment of other mutual funds.
Risk-free gilt-edged securities
The description applied to Government securities because they carry the sovereign's commitment to pay interest and repay principal, and so have practically no default risk. They still carry interest rate risk.
Section 193
The TDS provision under which no tax is deducted from interest on Central or State Government securities paid to a resident, except on the 8% Savings (Taxable) Bonds 2003 and 7.75% Savings (Taxable) Bonds 2018, and even then only where interest paid in the year exceeds Rs 10,000.
Section 50AA
The provision taxing gains on Market Linked Debentures, Specified Mutual Funds and unlisted bonds and debentures as short-term capital gains irrespective of the period of holding, with the cost of improvement taken as nil.
Section 89A
The provision taxing income from a notified overseas retirement account at the time of withdrawal rather than on accrual, to remove the mismatch faced by returning non-residents. The notified countries are the USA, Canada and the United Kingdom.
Specified account (section 89A)
An account maintained in a notified country for retirement benefits, income from which is not taxable there on accrual and is taxed by that country at the time of withdrawal or redemption.
Specified Mutual Fund Type 1
A fund investing 65 per cent or more of its proceeds in debt or money market instruments, directly or indirectly, bought after 1 April 2023. All its gains are short term under section 50AA.
Specified Mutual Fund Type 2
A fund other than Type 1 investing less than 35 per cent directly in equity shares of Indian companies, bought on or after 1 April 2023 and sold before 1 April 2025 — typically gold, silver, international or fund-of-funds holdings. A limited-edition category, all of whose gains are short term.
State Development Loan (SDL)
A dated security issued by a State Government. Interest is serviced half-yearly and principal repaid at maturity. States issue only SDLs, never treasury bills.
Tax-free bond
A bond whose interest is exempt in the investor's hands under section 10. The capital gain on its transfer or redemption remains fully taxable, in the same way as a coupon bond.
Tax Residency Certificate (TRC)
A certificate obtained from the country of residence, required before a non-resident can claim relief under a DTAA.
Treasury Bill (T-Bill)
A short-term Government instrument issued at a discount in three tenors — 91, 182 or 364 days. It offers no interest; the return is the difference between issue price and face value, taxed as a short-term capital gain.
Twenty per cent dividend deduction cap
A resident unit-holder may deduct interest expenditure incurred to earn mutual fund dividend, but only up to 20 per cent of the total dividend income. No other expense is deductible, and the excess interest is simply lost.
Yield-to-maturity
The interest rate at which the present value of a bond's future cash flows equals its market value. It is implied by the price paid, not promised by the issuer.

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Original explanatory writing based on the official NISM workbook for Series X-B, which is published and copyrighted by NISM. Check figures against the current edition at nism.ac.in.

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