Interest on delayed GST returns: staggered nil interest grace periods, then standard interest rate applies for specified months. The amendment substitutes the first proviso to prescribe interest on delayed payment for persons filing FORM GSTR-3B: taxpayers with turnover above rupees 5 Crores receive a short nil interest grace period from the due date and nine per cent per annum thereafter for February-April 2020; taxpayers with turnover up to rupees 5 Crores receive staggered nil interest grace periods for February-July 2020, each with its own cut off date, after which nine per cent per annum applies.