Yield Curve
The Yield Curve is a graphical representation plotting the yields (interest rates) of bonds of the same credit quality across different maturities, from short-term to long-term. In India, the government securities yield curve — plotting RBI-issued G-Sec yields from 91-day T-Bills to 40-year bonds — is the benchmark reference for all fixed income pricing.
The yield curve is often described as one of the most information-rich charts in all of financial markets. In its normal, upward-sloping configuration, longer-maturity bonds yield more than shorter-maturity ones. This reflects two fundamental realities: that locking money away for longer periods carries greater uncertainty, and that investors demand a 'term premium' for committing capital over longer horizons. In India, the benchmark government securities yield curve spans from the 91-day Treasury Bill at the short end to 30-year or 40-year G-Secs at the long end, with the 10-year G-Sec yield serving as the single most-watched reference rate.
The shape of the yield curve is not static — it steepens, flattens, and occasionally inverts depending on monetary policy expectations and economic conditions. During the RBI's aggressive rate-cutting cycle of 2015–2016, short-term rates fell sharply while long-term rates remained sticky, flattening the curve. During periods of RBI tightening, short-term rates rise faster than long-term rates, which can also flatten or invert the curve. The yield curve's shape is continuously communicated to market participants through daily G-Sec auctions conducted by the RBI, which sets the benchmark prices for the whole maturity spectrum.
For bond portfolio managers, the yield curve is the central organising framework. A manager who expects the yield curve to 'steepen' (long rates rising relative to short rates) would underweight long-duration bonds and overweight short-duration positions. A 'bull steepener' — where short rates fall faster than long rates — favours short-duration bonds. Open Market Operations (OMOs), especially Operation Twist, are RBI tools specifically designed to influence the shape of the yield curve by buying and selling at different maturities simultaneously.
For corporate issuers and retail investors, the government yield curve serves as the pricing floor for all debt instruments. A corporate bond yield is always quoted as 'G-Sec yield + credit spread' at the corresponding maturity. When the 10-year G-Sec yield rose above 7.5% in 2022 due to inflation and global rate hikes, corporate bond yields at the 10-year tenor rose commensurately, increasing the cost of long-term borrowing for Indian companies. This illustrates how the government yield curve radiates pricing signals throughout the entire fixed income ecosystem.