Investments made in an FMP above a certain period allow an investor to take advantage of indexation benefit which can result in lower tax on their gains to the extent of tax saved on the investment. As per current regulations, long term capital gains from debt mutual funds, such as FMPs, enjoy indexation benefit which means adjusting the cost of investment by inputting the impact of inflation on the amount invested for the holding period. Thus, the actual cost of investment will increase equivalent to the indexation factor thereby reducing the capital gains while computing tax.
In case of FMPs, an investment held for a period of more than 36 months qualifies as a long-term investment. So, for any gains arising from this investment, the tax liability is 20% (plus surcharge) with indexation. Further, higher the tax bracket of the investor, higher is the benefit to invest