Penalty of Rs 50 or 20

sami (article assistant) (54 Points)

15 February 2021  
i have to file gst 3b return
for last few monthes. i have itc unclaimed on those months. if i claim the ITC of the month in its respective month does it attract penalty of Rs 50 per day or 20. I don't haves sales for those months.. please help me out