How can I invest in SIP using HDFC securities? What would be the brokerage charge? Is there any other option to invest in SIP to gain maximum profit?

When you invest through HDFC Securities or ICICI Direct you would be investing in regular plan mutual funds (i.e. those which are not Direct Plans). Hence you will incur brokerage or commission of about 1% to 1.5% in your equity investments. This may seem small but over time it adds up to 40% of your kitty!

Instead go for a direct mutual fund platform (disclosure: i am with jama.co.in which is a Direct MF platform ) that offers features like SIP, STP and also helps you with fund selection. Why lose your hard earned money to brokerages and commissions??