Top-up SIP: A systematic way in which investors can do this is by arithmetically increasing the SIP amount periodically by a fixed amount, usually every year. Perpetual SIP: A kind of systematic investment plan under which the investor doesn't have to specify the date of withdrawal. Flexi SIP: Investments can be changed from time to time (according to market conditions) in a Flexi SIP. Trigger SIP: Trigger SIP not only offers flexibility in investing but also enables investors to take exit options at their will.