Deep discount bonds (DDBs), also called Zero-interest bonds or zero-coupon bonds, are debt instruments issued at a heavy discount to their face value and redeemed at par on maturity. They pay no periodic interest; the investor’s return is the difference between the issue price and the maturity value. For example, a bond with a face value of ₹1,00,000 may be issued at ₹20,000 and mature after 25 years. Because of the long tenure, they suit long-term investors and help issuers conserve cash, since there is no interest outflow until redemption. IDBI issued the first DDBs in India in 1992, while US Treasury STRIPS are a global example. Their value is highly sensitive to interest rate changes.
What are the Features of Deep Discount Bonds?
1. Issued at a Deep Discount
Deep discount bonds are issued at a price far below their face value, often at a discount of 70 to 80 percent. The investor pays a small amount today and receives the full face value on maturity. For instance, a bond of ₹1,00,000 may be issued at ₹20,000. This large gap between the issue price and the redemption value is the main attraction for investors. It also gives the issuer a sizeable initial inflow of funds at low cost, which can be used for long-term projects such as infrastructure or expansion.
2. No Periodic Interest Payments
These bonds carry a zero coupon, meaning no interest is paid during the life of the bond. The entire return comes as capital gain, which is the difference between the purchase price and the maturity value. This feature suits investors who do not need regular income and prefer to see their money compound over time. For issuers, it removes the burden of periodic interest outflows, improving cash flow management in the early years. Globally, zero-coupon instruments such as US Treasury STRIPS work on the same principle.
3. Long Maturity Period
Deep discount bonds usually have a long tenure, often 10, 20, or even 25 years, so that a small investment can grow into a large sum. IDBI’s first issue in India in 1992 carried a very long maturity of this kind. The long period allows the discount to accumulate into meaningful returns through the effect of compounding. It makes these bonds suitable for goals such as retirement planning, children’s education, or long-term wealth creation. However, investors must be prepared to lock in funds for years, which reduces liquidity unless the bond can be sold in the market.
4. Redemption at Par Value
On maturity, the bond is redeemed at its full face value, regardless of the discounted price paid at issue. This gives the investor a fixed and known maturity amount, making returns predictable if the bond is held to the end. The yield to maturity can be calculated in advance from the issue price, face value, and tenure. For example, a bond bought at ₹20,000 and redeemed at ₹1,00,000 after 25 years gives a clear effective annual return. Issuers must plan to arrange a large lump-sum repayment at maturity, often through a sinking fund.
5. Sensitivity to Interest Rate Changes
The market price of deep discount bonds is highly sensitive to interest rates. Since all the cash flow arrives at the end, their duration is long, so even a small rise in market rates can sharply reduce their price, while a fall can raise it. This interest rate risk matters for investors who may sell before maturity. Holding the bond till redemption removes this uncertainty. Because of this volatility, these bonds are often used by investors who can hold them to maturity, while traders may use them to speculate on rate movements.
6. Option of Call, Put, and Tax Treatment
Many deep discount bonds include call and put options. A call option lets the issuer redeem the bond early, while a put option lets the investor sell it back at a pre-decided price, giving flexibility and some liquidity. The tax treatment also matters: the accrued discount is generally taxed as interest income or capital gain depending on the holding period and prevailing law, so investors should check current rules. These features make the bonds adaptable, but investors must also consider reinvestment and credit risk of the issuer.
How do Deep Discount Bonds Work?
1. Issue at a Deep Discount
The issuer, such as a company or financial institution, offers the bond at a price far below face value. An investor pays this small issue price upfront, for example ₹20,000 for a bond with a face value of ₹1,00,000. The issuer receives this amount immediately and uses it for long-term funding, such as infrastructure or expansion. The terms, including the tenure, face value, and any call or put options, are fixed in the offer document at the start. Credit rating agencies like CRISIL or Moody’s also rate the issue, helping investors judge issuer risk.
2. No Interest During the Holding Period
Unlike regular bonds, deep discount bonds pay no coupon during their life. The issuer makes no periodic interest payments, so cash stays within the business for years. For the investor, the return builds silently as the bond’s value moves closer to its face value over time. This is an application of compounding, where the implicit interest accrues and grows on itself. For accounting purposes, the issuer usually spreads the discount over the bond’s life as finance cost, following standards such as Ind AS 109 or IFRS 9.
3. Value Accretion Over Time
As maturity approaches, the bond’s present value rises gradually towards its face value. The pace depends on the implicit yield and prevailing market interest rates. For instance, a ₹20,000 bond maturing at ₹1,00,000 in 25 years yields roughly 6.6 percent annually. If market rates fall, the bond’s market price rises, and if they increase, it falls. Investors who sell before maturity therefore face price fluctuations, while those who hold to the end receive the predetermined return regardless of market movements.
4. Optional Exit Through Call, Put, or Sale
Before maturity, exit is possible in a few ways. The investor can sell the bond on the secondary market, though liquidity may be limited. If the bond has a put option, the holder can return it to the issuer at a pre-agreed price on specified dates. If it has a call option, the issuer may redeem it early at a stated value. These options add flexibility but also affect returns, so investors should study the terms of issue carefully before investing, especially regarding timing and redemption prices.
5. Redemption at Maturity
At maturity, the issuer repays the full face value in a single lump sum, regardless of the low issue price. The difference between this amount and the original investment is the investor’s total return. To meet this large obligation, issuers often build a sinking fund or plan cash reserves in advance. IDBI’s 1992 issue in India and US Treasury STRIPS globally follow this pattern. The investor should also consider credit risk, since repayment depends on the issuer’s ability to pay, and check current tax rules on the accrued gain.
What is the Process of Issuing Deep Discount Bonds?
1. Board Approval and Planning
The process begins when the company’s board of directors decides to raise funds through deep discount bonds and approves the size, tenure, and purpose of the issue. Management assesses the funding requirement, the expected cost of capital, and its ability to repay a large lump sum at maturity. Shareholder approval may be needed through a special resolution if borrowing limits under the Companies Act, 2013 are involved. Planning also covers the discount rate, face value, and call or put options, so that the instrument suits both the issuer’s cash flows and investor expectations.
2. Appointment of Intermediaries
The issuer appoints merchant bankers or lead managers to structure and market the issue. A debenture trustee is also appointed to protect investors’ interests, as required for public issues in India. Other intermediaries include registrars, legal advisers, bankers to the issue, and auditors. These experts help with pricing, documentation, and compliance with SEBI regulations. Globally, investment banks such as Goldman Sachs or JP Morgan perform similar underwriting roles. Their involvement improves credibility, ensures proper disclosure, and helps the issue reach the right investors at an appropriate issue price.
3. Credit Rating and Pricing
Before issue, the bonds are rated by a credit rating agency such as CRISIL, ICRA, CARE, or Moody’s. The rating reflects the issuer’s repayment capacity and strongly influences investor demand and pricing. Using the rating, tenure, and prevailing market interest rates, the issuer fixes the issue price and the implicit yield. For example, a ₹1,00,000 bond maturing in 25 years may be priced at ₹20,000. Accurate pricing is essential, because underpricing raises the cost of funds while overpricing may reduce subscription.
4. Regulatory Compliance and Offer Document
The issuer prepares an offer document (prospectus or information memorandum) containing the terms, risk factors, financials, use of proceeds, and redemption details. In India, public issues follow SEBI’s NCS Regulations, while private placements follow the Companies Act, 2013 and related rules. Documents are filed with the stock exchanges, the Registrar of Companies, and SEBI where applicable. Globally, the US SEC and other regulators require similar disclosure. Full and honest disclosure protects investors and avoids legal liability. Requirements change over time, so current rules should be verified.
5. Marketing, Subscription, and Allotment
Once approved, the issue is opened for subscription to retail investors, institutions, and banks, either publicly or through private placement. Investors apply and pay the discounted issue price. The lead manager promotes the issue through roadshows and investor meetings. After the issue closes, the company and registrar finalise allotment, refund excess application money, and issue bonds in demat form. If demand is high, allotment may be proportionate, so investors should consider the subscription level and their category when applying.
6. Listing, Servicing, and Redemption
After allotment, the bonds may be listed on exchanges such as NSE or BSE to provide liquidity. During the life of the bond, the issuer maintains records, accrues the discount as finance cost under Ind AS or IFRS, and reports to the debenture trustee. To prepare for repayment, it may build a sinking fund. On maturity, the issuer redeems the bond at face value in a single payment. If call or put options exist, early redemption follows the stated terms and notice period.
What is the Maturity Period of Deep Discount Bonds?
Deep Discount Bonds are long-term debt instruments issued at a price significantly lower than their face value. These bonds do not generally pay regular interest during their tenure. Instead, investors receive the full face value at the time of maturity, and the difference between the purchase price and face value represents their return.
The maturity period of Deep Discount Bonds is generally long-term and may range from 5 to 25 years, depending on the issuing organisation and the terms of the bond. For example, a bond with a face value of ₹1,00,000 may be issued at ₹25,000 and redeemed at ₹1,00,000 after 25 years. The investor earns ₹75,000 as the difference between the issue price and redemption value, subject to applicable terms and taxes.
The main purpose of a longer maturity period is to provide investors with an opportunity to earn substantial returns through capital appreciation without receiving periodic interest payments. These bonds are suitable for investors who have long-term financial goals and do not require regular income.
What is the Role of Deep Discount Bonds in Capital Structure?
1. Source of Long-Term Debt Capital
Deep discount bonds form part of a firm’s long-term debt, sitting alongside term loans and conventional debentures. Because they run for 10 to 25 years, they provide stable funding for infrastructure, plant expansion, or technology projects. The issuer receives funds upfront at a heavy discount and repays only at maturity, which suits projects with delayed returns. Financial institutions like IDBI in India and governments issuing zero-coupon securities globally have used this approach. In the capital structure, DDBs increase the debt component and widen the range of funding sources available to the firm.
2. Improves Cash Flow Management
Since no periodic interest is paid, DDBs preserve cash during the early years when a project may not yet generate profits. This reduces the fixed charge burden and eases pressure on working capital. A company building a power plant or highway, for example, can avoid interest outflows until operations begin. This helps maintain a healthy interest coverage ratio and liquidity position. However, the large lump-sum repayment at maturity must be planned carefully, often through a sinking fund, so the capital structure does not face a repayment crisis later.
3. Lowers the Overall Cost of Capital
Debt is generally cheaper than equity because interest is tax-deductible. The accrued discount on DDBs is usually treated as a finance cost spread over the bond’s life, giving a similar tax shield, subject to prevailing law. Using DDBs within an optimal mix of debt and equity can therefore reduce the weighted average cost of capital (WACC) and raise firm value. Compared with issuing new equity, DDBs avoid ownership dilution and the pressure of dividend expectations. The benefit holds only while debt remains within a prudent limit.
4. Provides Financial Leverage
DDBs let a firm use borrowed funds to enhance returns to equity shareholders. If the project earns more than the implicit cost of the bond, the surplus raises earnings per share and return on equity. Because debt holders do not share in profits or voting rights, promoters keep control. Firms like Reliance Industries and Tata Group use various debt instruments for this leverage effect. However, leverage works both ways: higher debt raises financial risk, and a drop in earnings can magnify losses, so the debt-equity ratio must be monitored.
5. Adds Flexibility and Diversification of Funding
DDBs broaden the firm’s funding mix, reducing dependence on bank loans or equity markets. Features such as call and put options let issuers and investors adjust timing, offering flexibility to refinance if interest rates fall. Attracting different investor groups, such as pension funds and long-term savers, also improves market access. Rating agencies like CRISIL and Moody’s examine how DDBs affect solvency and repayment capacity. A well-planned issue therefore supports a balanced capital structure, while excessive reliance can raise refinancing risk at maturity.
What is the Tax Treatment of Deep Discount Bonds?
The tax treatment of Deep Discount Bonds depends on the applicable income tax provisions and the nature of the investor. The difference between the purchase price and the redemption value represents the investor’s income. Generally, this difference is taxable under the applicable provisions of the Income Tax Act. If the bonds are held as investments, the gain may be treated as capital gains or interest income, depending on the applicable tax rules and circumstances. The period of holding also influences the tax treatment. Investors should consider the applicable tax rate, holding period and redemption conditions while making investment decisions.
What are the Advantages of Deep Discount Bonds for Issuers and Investors?
1. No Periodic Interest Outflow
Deep discount bonds carry a zero coupon, so the issuer pays no interest during the bond’s life. This preserves cash in the early years, when a project such as a power plant, highway, or new factory may not yet earn revenue. Lower fixed charges reduce pressure on working capital and keep the interest coverage ratio healthy. The company can reinvest the saved cash in operations or expansion. Institutions like IDBI used this feature in India, and governments issue similar zero-coupon securities globally. The only cash obligation is the single payment at maturity.
2. Access to Long-Term Funds at Low Initial Cost
The issuer receives a meaningful upfront inflow at the discounted issue price, which suits projects with delayed returns. Because tenures run 10 to 25 years, the firm secures stable long-term funding without frequent refinancing. This reduces dependence on short-term bank loans and market volatility. Companies planning infrastructure, energy, or technology investments find this particularly useful. Matching the long life of the asset with the long life of the liability also improves financial planning and reduces the risk of a funding mismatch.
3. Tax Shield and Lower Cost of Capital
The accrued discount is generally treated as a finance cost and spread over the bond’s life, which can provide a tax shield, subject to prevailing tax law. Debt is usually cheaper than equity, so using DDBs within a prudent mix can lower the weighted average cost of capital (WACC). Unlike new equity, bonds involve no dividend expectations. This improves earnings per share when the funds earn more than the implicit cost. Firms should confirm current tax and accounting treatment under Ind AS or IFRS before issuing.
4. No Dilution of Ownership or Control
Bondholders are lenders, not owners, so they receive no voting rights and no share in profits. Promoters can raise large sums while retaining full management control, unlike an equity issue that spreads ownership. This suits family-run businesses and founder-led firms such as Reliance Industries or Tata Group, which use debt instruments to fund growth. Call and put options add flexibility, letting the issuer redeem early and refinance if interest rates fall. This combination of funding and control makes DDBs attractive for strategic expansion.
What are the Advantages of Deep Discount Bonds for Investors?
1. Low Initial Investment
Investors buy these bonds at a heavy discount, so a small outlay secures a much larger maturity value. For example, ₹20,000 invested today can grow to ₹1,00,000 on redemption. This makes DDBs accessible to small and retail investors who cannot commit large sums. It also allows disciplined long-term savings without regular contributions. The low entry price lets investors build a diversified portfolio of instruments. Globally, US Treasury STRIPS offer the same advantage to individuals and institutions.
2. Assured and Predictable Returns
The maturity value, tenure, and issue price are fixed at the start, so the yield to maturity can be calculated in advance. If the bond is held to redemption, the return is predetermined and unaffected by market swings. This certainty suits investors planning for goals such as retirement, children’s education, or marriage expenses. A ₹20,000 bond maturing at ₹1,00,000 in 25 years gives roughly 6.6 percent annually. Safety depends on the issuer’s credit rating, so investors should check ratings from agencies like CRISIL or Moody’s.
3. Power of Compounding and No Reinvestment Risk
Since no interest is paid out, the return accumulates and compounds inside the bond at the original yield. Investors do not have to reinvest periodic coupons at uncertain future rates, which removes reinvestment risk. This is valuable when interest rates are expected to fall, as the investor has locked in a rate for the entire tenure. The effect grows stronger over long horizons, turning a modest sum into a substantial amount. It is a convenient, hands-off way to build long-term wealth.
4. Liquidity Options and Potential Capital Gains
Many DDBs are listed on exchanges such as NSE or BSE, allowing investors to sell before maturity. Put options let holders return the bond to the issuer at a pre-agreed price, adding an exit route. If market interest rates fall, the bond’s price rises sharply because of its long duration, offering capital gains to those who sell early. Traders also use them to speculate on rate movements. Liquidity can be limited in practice, and prices fall when rates rise, so investors should assess their holding horizon carefully.
What are the Limitations of Deep Discount Bonds for Issuers?
1. Large Lump-Sum Repayment at Maturity
Since no interest is paid during the bond’s life, the issuer must repay the full face value in one go at maturity. This creates a heavy cash outflow that can strain liquidity if not planned well. A ₹20,000 bond redeemed at ₹1,00,000 means the obligation grows five times over the tenure. Firms usually need a sinking fund or dedicated reserves to prepare. If the project underperforms, the issuer may face repayment difficulty or be forced to refinance on unfavourable terms, raising default risk and damaging its credit standing.
2. High Implicit Cost of Borrowing
Although no coupon is paid, the discount represents an interest cost that compounds over many years. The effective cost of funds can be high, especially for long tenures or lower-rated issuers who must offer deeper discounts to attract investors. The issuer ends up repaying far more than it received. Because the cost is hidden in the discount, management may underestimate the true burden. Comparing the yield to maturity with the cost of conventional bonds or bank loans is therefore essential before choosing this instrument.
3. Refinancing and Interest Rate Risk
Long maturities of 10 to 25 years make it hard to predict future conditions. If market interest rates fall, the issuer is locked into a higher implicit rate unless the bond carries a call option, which itself involves cost and investor resistance. If rates rise or credit markets tighten, refinancing the large maturity payment may be difficult or expensive. Changes in business conditions and regulation over decades add further uncertainty. Such risks require careful financial planning and ongoing monitoring of the firm’s debt position.
4. Higher Leverage and Limited Investor Appeal
DDBs add to the firm’s debt burden, raising the debt-equity ratio and financial risk, which rating agencies like CRISIL and Moody’s examine closely. A downgrade increases borrowing costs across the firm. Demand can also be limited, since many investors prefer regular income and avoid very long lock-in periods. Issuers may need to offer sweeteners such as put options, adding complexity and cost. Accounting and tax treatment of the accrued discount under Ind AS or IFRS also needs careful handling, with current rules verified.
What are the Limitations of Deep Discount Bonds for Investors?
1. No Regular Income
DDBs pay no periodic interest, so investors receive nothing until maturity. This makes them unsuitable for retirees or anyone needing regular cash flow. Money is effectively locked away for 10 to 25 years, and returns are realised only at the end. Investors must find other sources of income meanwhile, and cannot use the bond’s returns to meet ongoing expenses. The delayed payoff also makes it harder to benefit from alternative opportunities that may arise, such as higher-yielding instruments or sudden investment needs.
2. Interest Rate Risk and Price Volatility
Because all returns arrive at maturity, DDBs have a very long duration and their market price is highly sensitive to rate changes. A modest rise in market interest rates can sharply cut the bond’s price, causing losses to those who sell early. Investors who hold to maturity avoid this loss but may still face an opportunity cost if better rates become available. Globally, zero-coupon instruments like US Treasury STRIPS show similar swings. This volatility makes DDBs risky for investors with uncertain holding horizons.
3. Credit and Default Risk
The entire return depends on the issuer’s ability to pay a large sum many years later. Over a long tenure, an issuer’s financial health can change greatly, and a downgrade by agencies such as CRISIL, ICRA, or Moody’s can reduce the bond’s value. If the issuer defaults, the investor may lose both principal and accrued return, since nothing was received earlier. Unlike coupon bonds, there are no interim payments to cushion the loss. Careful review of the credit rating and issuer fundamentals is essential.
4. Limited Liquidity and Tax Burden
Many DDBs have a thin secondary market, making early sale difficult or only possible at a discount. Even listed issues may see low trading volumes. Put options help but are available only on specified dates and terms. Tax can also be a drawback: in many jurisdictions, the accrued discount may be taxable as income or gain, and some systems tax it annually even though no cash is received. Investors should check current tax rules and consider inflation, which can erode the real value of a fixed maturity amount over decades.
