Most business owners can name one or two GST deadlines off the top of their head — usually GSTR-3B. But a compliant business is actually tracking several deadlines throughout the year, each with its own consequence for missing it. Here are 6 you should have on your calendar.
Businesses we work with across Alwarpet and the rest of Chennai usually have at least one of these six slipping through the cracks.
Table of Contents
- 1. GSTR-1 — your monthly sales report
- 2. GSTR-3B — your monthly tax summary
- 3. GSTR-9 — your annual return
- 4. GSTR-9C — reconciliation with your audited financials
- 5. LUT renewal — for exporters, once a year
- 6. Registration amendment — 15 days from any change
- Not sure which of these apply to you?
- Frequently asked questions
- Which of these 6 deadlines matters most for my business?
- Do I need to worry about GSTR-9C if my turnover is under ₹5 crore?
- What happens if I miss the 15-day registration amendment deadline?
- Is LUT renewal really necessary every year?
- Talk to a consultant
1. GSTR-1 — your monthly sales report
Filed before GSTR-3B, and it’s what your buyers rely on to claim their own Input Tax Credit. A late or wrong GSTR-1 doesn’t just cost you — it can cause a mismatch on your customer’s books too.
2. GSTR-3B — your monthly tax summary
The one everyone knows, and the one with the most direct financial consequence — late fee and interest both apply, and after two consecutive misses, e-way bill generation gets blocked.
3. GSTR-9 — your annual return
Mandatory if your turnover crossed ₹2 crore, due 31 December — and it’s not just a summary of your 12 monthly filings, it’s a full reconciliation that can surface discrepancies nobody noticed month to month.
4. GSTR-9C — reconciliation with your audited financials
If turnover crossed ₹5 crore, this runs alongside GSTR-9 on the same deadline — and since it’s self-certified, the responsibility for it being accurate sits with you, not a CA’s signature.
5. LUT renewal — for exporters, once a year
If you export and rely on a Letter of Undertaking to ship without paying GST upfront, it has to be renewed every financial year. Miss the renewal and you start paying tax you’re legally entitled not to.
6. Registration amendment — 15 days from any change
Changed your address, added a partner, updated your bank details? You have 15 days to file the amendment — and it’s a deadline almost nobody thinks of as a “GST deadline” until they get a notice over it.
Not sure which of these apply to you?
Which deadlines matter depends on your turnover, business type, and whether you export or hold multiple registrations. Call or WhatsApp 70 9232 9232 and we’ll map out exactly what your business needs to track — and handle it for you.
Frequently asked questions
Which of these 6 deadlines matters most for my business?
It depends on your turnover, business type, and whether you export or hold multiple registrations. Call 70 9232 9232 and we’ll map out exactly what your business needs to track.
Do I need to worry about GSTR-9C if my turnover is under ₹5 crore?
No — GSTR-9C only applies if turnover crossed ₹5 crore in the financial year. Below that, only GSTR-9 (at the ₹2 crore threshold) applies.
What happens if I miss the 15-day registration amendment deadline?
It’s a deadline almost nobody thinks of as a “GST deadline” until they get a notice over it — an address, partner, or bank detail change has to be filed as an amendment within 15 days of the change.
Is LUT renewal really necessary every year?
Yes, if you’re an exporter relying on a Letter of Undertaking to ship without paying GST upfront — miss the annual renewal and you start paying tax you’re legally entitled not to.
Talk to a consultant
Call or WhatsApp 70 9232 9232 — fixed, transparent pricing.