ITC on previous month tax liability

nikhil (ca) (221 Points)

02 September 2018  
If i forget to take one sale invoice Rs.100 on which output tax is Rs.18 in july return & now i want to take the invoice in aug & my ITC of aug is greater than output tax of aug including left out invoice of July.
Question is whether i have to pay interest on previous month left out invoice?
Sec 50 of Cgst doesn't say the amount on
which interest is to be calculated whether on Gross amount i.e output tax OR Net amount (after ITC).
Please comment.