Is it necessary to pay stamp duty immediately after the payment of MCA21 services fees, where online mode of payment is opted?

In case of STP forms, for example annual forms 20B, 23AC & 23ACA etc, if there is any defect or incompleteness, same is marked by the RoC as ‘Defective’. You are required to file such form afresh after rectifying the defects/ incompleteness with payment of fee and additional fee, as applicable.