Gstr v 3b

No you cant rectify it...

no need to worry....show correctly in gstr 2

I have filed my gstr 3b on 29-09-2017 and my tax liability was 22000 and late fee 1800 and I have paid 22000+ 1800 but I forgot to pay 18% interest 
what to do now ?
people are saying 
1) you have to pay only 9 days interest while filing gstr 3 ( but date is not declared yet then ?)
2) no need to pay interest for July and August only penalty should be paid
3) you have to pay interest till the filing date of gstr 3 i.e. From 20 Sept to date of GSTR 3B of August ( date is not yet declared )

Which is correct. Please give me the sulution on this issue.

You have to pay interest from 20Sept to date of payment while filing GSTR-3.

ok..thanks

Welcome...... My pleasure......

mam, previously you have said only 9 days now saying upto date of gstr3 date. which one is correct

You have to pay 9 days interest at the tym of filing GSTR-3 not upto date of GSTR-3.

ok...thank you mam. :)

Welcome.....

When time will come you will come to know how many days interest portal will charge. Worst part at this moment is that you cannot take any measure to rectify this fault. Only wait n watch.

It is a very common concept of interest that if it is not squared off at particular date then liability will continue.