Restriction on input tax credit: refunds barred where input tax on specified goods exceeds output tax under state GST rules. No refund of unutilized input tax credit shall be allowed for goods listed in the Table where credit accumulated because the rate of tax on inputs is higher than the rate of tax on output supplies (other than nil rated or fully exempt supplies); tariff classifications are to be determined by reference to the First Schedule to the Customs Tariff Act, 1975 and its interpretative notes, and the notification takes effect from the date specified in the instrument.