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GST filing basics

Monthly vs quarterly vs yearly returns - which applies to you, the real due dates, and how to switch frequency on the GST portal.

? Which GST returns does an e-commerce seller file?
GSTR-1 and GSTR-3B are yours; GSTR-8 is the marketplace's; GSTR-9 is the annual wrap-up.
? Monthly or quarterly filing - which one applies to me?
Turnover up to ₹5 Cr can choose quarterly (QRMP); above ₹5 Cr monthly is mandatory.
? What are the GST return due dates?
GSTR-1 by the 11th (monthly) or 13th (quarterly); GSTR-3B by the 20th / 22nd / 24th.
? How do I change my filing frequency (monthly ↔ quarterly) on the GST portal?
Services → Returns → Opt-in for Quarterly Return - within the opt-in window.
? Do I need GST registration to sell online?
On TCS marketplaces like Amazon, Flipkart and Meesho - effectively yes, for goods.
? What do I need ready before filing GST?
GSTIN, marketplace reports, purchase records - the pre-filing checklist.
? GST filing FAQ - quick answers for online sellers
One-line answers to the questions sellers search for most.
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