You can construct your fixed-income portfolio by either purchasing bonds or going through investment vehicles like mutual funds (MFs). Bonds are of multiple types, such as G-Secs, where you can participate through the Reserve Bank of India’s (RBI) Retail Direct Gilt system. You can buy corporate bonds through trading accounts with broking houses, and non-banking financial companies (NBFCs) specialising in bonds. Corporate bonds include tax-free public sector undertaking (PSU) bonds, taxable PSU and private sector bonds, etc. PSU and private sector bonds are classified as per credit rating, such as AAA, AA, etc. In MFs, there are multiple fund categories classified as per portfolio maturity and, to a limited extent, on credit rating. In bonds or bond funds, the higher you go on maturity, the higher the gains or losses on the market movement of interest rates. So, shorter-maturity bonds or bond funds are relatively more stable in performance.