Last date for GSTR4 for F.Y 2019-20 was 31/10/2020 as per notification 64 ( C.T) Dated 31/8/2020 , just confirm any extension on CBIC web site in notification section .
The due date to file GSTR-4 of 2019-20 was 31-10-2020
(Refer blog: GST Compliance Calendar )
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