8 resources from gst.gov.in we point founders to, and the questions each answers.
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The government's Invoice Registration Portal, where businesses above the e-invoicing threshold report B2B invoices and get an Invoice Reference Number. Its notices also set rules such as the 6-digit HSN code for taxpayers with turnover above ₹5 crore.
GSTN's FAQ on GSTR-3B: due on the 20th for monthly filers and the 22nd or 24th after the quarter for quarterly filers by state, mandatory even with no business, and how nil and zero returns work.
GSTN's FAQ on GSTR-1: due on the 11th for monthly filers and the 13th after the quarter under QRMP, which is open to turnover up to ₹5 crore, and filed with EVC or DSC.
The government's own portal where GST returns are filed and paid, free. Most businesses prepare the data in their billing or accounting software and upload it here, or let their software file through a GST Suvidha Provider.