No, you don’t pay extra charges - the GTD facility is completely free to use. Here's how it works: 

• Placing or triggering a GTD order costs nothing. Brokerage applies only when your order actually executes. 
• Executed orders are charged at your regular rates. The same brokerage plan that applies to your normal delivery or F&O trades. 

In short: you only pay when you trade, and you pay the same as always.