Tax-Free Bonds (Detailed)
Tax-free bonds are long-tenure debt instruments issued by specified Indian public sector undertakings — including NHAI, IRFC, PFC, REC, HUDCO, NTPC, and others — where the interest income received by investors is completely exempt from income tax under Section 10(15)(iv)(h) of the Income Tax Act, 1961, making their effective post-tax yield substantially higher than comparable taxable instruments for investors in higher tax brackets.
The bulk of tax-free bond issuances in India occurred between 2012 and 2016, during which SEBI and the Ministry of Finance authorised a series of public sector infrastructure entities to raise long-term funds from retail investors with the incentive of tax-free interest. The authorised issuers included National Highways Authority of India (NHAI), Indian Railway Finance Corporation (IRFC), Power Finance Corporation (PFC), Rural Electrification Corporation (REC), Housing and Urban Development Corporation (HUDCO), National Thermal Power Corporation (NTPC), and IIFC (India Infrastructure Finance Company). These issuances were typically for 10, 15, and 20-year tenures, with coupon rates ranging from 7.5% to 9% per annum depending on the interest rate environment at the time of issuance.
The tax-free nature of interest significantly enhances the effective yield for high-bracket taxpayers. A tax-free bond yielding 7.5% per annum has an effective pre-tax equivalent yield of approximately 10.7% for an investor in the 30% tax bracket (with surcharge, effective at 34.32%, the equivalent yield exceeds 11.4%). This substantial tax arbitrage explains why tax-free bonds commanded a significant premium in the primary market, with retail tranches often oversubscribed multiple times when interest rates were at cyclically high levels and the coupon rates were generous.
After the primary issuance window closed (broadly by 2016, with no fresh tax-free bond issuances authorised since), investors seeking tax-free bonds are restricted to the secondary market. Tax-free bonds from NHAI, IRFC, PFC, and REC are listed on both BSE and NSE, though trading volumes in secondary markets are typically thin compared to G-Secs or AAA corporate bonds. The illiquidity in secondary markets means that investors must sometimes accept significant bid-ask spreads, and large lot sales can move the market price. Retail investors dealing in lots of Rs 10,000 face less liquidity risk than institutions trying to exit Rs 50 crore positions.
Capital gains on tax-free bonds sold in the secondary market are taxable. If bonds are held for more than 12 months, gains are treated as long-term capital gains taxable at 10% without indexation (for listed bonds). For bonds held less than 12 months, STCG is taxable at slab rate. Only the interest income is tax-free — the capital appreciation component does not share this exemption. This distinction is frequently misunderstood: an investor who purchases an NHAI bond in the secondary market at a premium to face value and holds it to maturity will receive face value at redemption, resulting in a capital loss that is deductible against other capital gains.
The supply constraint of no new issuances since 2016, combined with sustained demand from HNI investors and family offices in higher tax brackets, has maintained secondary market prices at premiums that in many cases reduce the net YTM below the coupon rate. Investors evaluating secondary market tax-free bonds must compute both the tax-free yield (coupon divided by current price) and the effective YTM (accounting for capital loss or gain to maturity) to make an informed comparison against alternatives such as debt mutual funds or corporate NCDs.