RCM ITC and interest on late payment of RCM

Shivangi Aggarwal (15 Points)

15 February 2020  
if for the year 17-18 reverse charge on freight is not paid yet ,for eg Rs 10,000 .
Now in GSTR 9 Annual return if we pay that amount now that is in FY 19-20 during filing annual return ,can we take itc on RCM - 10000 (in our example) now in 19-20.

do we have to pay interest on that 10000 or not?