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India GST & Tax
Compliance Calendar 2026

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GST TDS Income Tax Corporate Other 🚨 Critical
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October

5 deadlines
Oct
11
GSTR-1 GST
Monthly GST return (Sep)
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Oct
13
GSTR-1 (Q2) GST
QRMP filers (Jul–Sep quarter)
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Oct
20
GSTR-3B 🚨 CRITICAL GST
Monthly GST return (Sep)
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Oct
31
TDS Return (Q2) TDS
Jul–Sep quarter TDS return
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Oct
31
ITR Filing (Transfer Pricing) Income Tax
Companies with international transactions
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