Credit note of Jan 21 not shown in gstr1 and 3b can be added on oct21?

Yes!! You Can Adjust it in Oct 2021

Thank you sir , but our auditor is saying that it can adjust till Sep 2021. After that no adjustment or amendment possible since the entry is related to fin year 20-21. 

Ok sir, we have already filed Sept return . Now no adjustment possible. Suppose if I cancelled that entry from tally and re enter today is it possible to show that credit note?

In which month goods sold?

Jan 2021 sales invoice generated and returned item on 30.3.21 but when I shown in tally the date by mistake shown as 4.1.21 instd of 30.3.21. So this credit note doesn't comes anywhere in gst. Only in books of accounts. Can I cancel that credit note and reenter in this month?

Sorry You cant adjust while filing Oct month GSTR-1

Sir, I discussed with gst dept. There is a rule in gst 16 (4) saying that fin year of credit note  treated as the date of entry and not the date of invoice. It's delink the word they use. So we decided to cancel that earlier entry and reenter in this month. In that way we can clear.

Ohh ok Thanks for the info

Thanks lot for your response sir