Common GST Mistakes and How to Avoid Penalties
Last updated: 2 July 2026 · 6 min read
Small errors in GST compliance add up to late fees, interest and blocked credit for your customers. Here are the most frequent mistakes and simple ways to avoid them.
1. Filing late (even NIL returns)
A NIL month still needs a return by the due date. Late filing triggers a per-day late fee and, if tax is due, 18% interest. Set reminders for GSTR-1 and GSTR-3B.
2. Using outdated rates
After the September 2025 reform, the 12% and 28% slabs are gone. Charging an old rate causes disputes and returns mismatches. Re-check with the rate finder.
3. Wrong CGST/SGST vs IGST
Applying CGST+SGST to an inter-state sale (or vice versa) is a common error. Let the place of supply decide it — the GST bill generator does this automatically.
4. Claiming ineligible or unmatched ITC
Only claim input tax credit that appears in your auto-drafted statement and meets all conditions. Claiming blocked credits invites reversal with interest.
5. Invoice errors
Missing GSTIN, wrong HSN, non-consecutive numbering or no amount in words can invalidate an invoice. Follow the GST invoice format.
FAQ
What is the most common GST mistake?
Filing returns late, which triggers a per-day late fee and 18% interest on any tax due. Filing on time — even NIL returns — avoids this.
Related: late fee rules, ITC basics, penalty calculator.