GST
GSTR-1, GSTR-3B & GSTR-9: Which GST Return Do You Need to File?
GST compliance involves multiple returns with different due dates. If you're confused about which return to file when, this guide breaks it down in simple terms with actual due dates.
If you're newly registered under GST, the compliance calendar can feel overwhelming. GSTR-1, GSTR-3B, GSTR-9... what is each one, and when is it due? Let's cut through the confusion.
GSTR-1 — Outward Supply Statement
This is where you declare all your sales (outward supplies) for the month or quarter. Include B2B invoices, B2C sales, credit notes, debit notes, and export invoices. Your customers see your GSTR-1 in their GSTR-2A/2B to claim Input Tax Credit (ITC). Getting GSTR-1 right is critical — mistakes here mean your customer can't claim ITC, which damages your business relationships.
Due date: 11th of the following month (monthly filers) or 13th after the end of the quarter (QRMP scheme filers with turnover < ₹5 crore).
GSTR-3B — Monthly Summary Return
This is a self-declared summary return where you report total outward supplies, total ITC claimed, and pay the GST payable. You must pay the tax liability by the due date even if your full GSTR-1 isn't ready. Think of it as the payment return.
Due date: 20th of the following month (large taxpayers) or 22nd/24th of the following month (smaller states vs. other states, for quarterly filers).
GSTR-9 — Annual Return
Filed once a year, GSTR-9 consolidates all your monthly returns for the financial year. It reconciles your outward supplies and ITC — any differences from your monthly returns need to be explained. Mandatory for taxpayers with annual turnover > ₹2 crore. Optional for those below ₹2 crore.
Due date: December 31 of the following financial year.
GSTR-2A and GSTR-2B — ITC Tracking
These are not returns you file — they're auto-generated statements showing you the ITC available based on your suppliers' GSTR-1 filings. GSTR-2A is dynamic (updates as suppliers file). GSTR-2B is static (generated on the 14th of each month and doesn't change). Most professional firms now use GSTR-2B for reconciliation as it's more reliable.
Common GST compliance mistakes:
Not filing GSTR-1 on time (your buyers can't claim ITC), claiming more ITC than what appears in GSTR-2B, not reversing ITC on exempt supplies or personal-use goods, forgetting reverse charge liability (RCM), and missing the annual return deadline.
Late fees: ₹50/day (₹25 CGST + ₹25 SGST) for delays in GSTR-1 and GSTR-3B, capped between ₹2,000 and ₹10,000 per return depending on turnover. For nil returns, the late fee is ₹20/day. Interest on tax liability: 18% per annum from the due date of GSTR-3B.
GST compliance is genuinely manageable when you have a system. Most businesses benefit from outsourcing their monthly GST filing to a professional — it's typically priced between ₹500-₹2,000/month depending on transaction volume, which is far less than a late fee or a notice.