In month of december 2013 I have taken VAT and CST registration in Mumbai (Maharashtra). I have filed the nil return for CST for quater ending on 31st December 2013. Till today i have done business in maharashtra only. Hence for the entire year my CST will be nil. I will file NIL return. Is i need to pay any CST as a token to continue having CST nos for future use. As I remeber in pre VAT era people used to pay Rs.1/- as a token amount when there is NIL CST so that they can continue using the CST no. as and when required.