It was our mistake that we charged lesser stamp duty for trades done till date...We would not be charging anything extra for all the trades done till date... Stamp duty charged varies in different states, 0.002 % to 0.01%, It is 0.005% with max of Rs 250 in Andhra, 0.004% in TN, 0.002% in Mumbai with no cap...But the good thing about Karnataka is that the maximum stamp duty that is charged per day is Rs 50... This budget is when announcement on uniform stamp duty on stock market transactions across all states will be made...