GST related query

Ajnas (Student) (844 Points)

16 December 2020  
Situation 1.sundry creditor account have Rs.354000(300000+18% GST), entire amount is writte off by the supplier, in this case any itc reversal is required?
Situation 2.sundry creditor account have Rs.300000 input Rs. 54000 18% on Rs. 300000 is already paid by the receipent remaining amount is writte off by the supplier in this case itc reversal is required?
Situation 3.sundry creditor account have Rs.300000 input Rs. 54000 18% on Rs. 300000 is already paid by the receipent remaining amount supplier allowed cash discount, this income on receipent account attract any GST?