Fixed maturity plans are closed-ended Debt Mutual Fund schemes that invest in a variety of debt instruments such as commercial papers, certificates of deposit, non-convertible debentures, G-Secs, and SDLs (State Development Loans). FMPs are closed-ended schemes, so they can only be purchased from the Asset Management Company (AMC) during the New Funds Offer (NFO) period only. Once an FMP's subscription period has ended, you may be able to buy it on the stock exchanges using your Demat and Trading account if the AMC lists the Scheme on Exchange there you may find a seller.
As the name implies, these schemes have a defined maturity; the maturity of the scheme is specified in the Scheme Information Document. You should read the scheme information document carefully. You cannot redeem FMP units before they mature. You have the option of selling your FMP from your Demat account on the stock exchange before maturity, but the liquidity of these instruments on the exchange is quite low, so you may be unable to find a buyer. As a result, it may be suggested that you should only invest in FMPs if you are willing to commit to the program until it matures. When the FMP matures, the investment proceeds calculated using the maturity Net Asset Value (NAV) will be credited to your bank account.
Fixed maturity plans are potentially a good investment option for locking in current yields for long periods of time (3 - 5 years or more). They aim for stable returns and potentially a good level of return visibility.
Mutual Fund investments are subject to market risks, read all scheme related documents carefully.