10 Common GST Mistakes to Avoid in 2026
Why This Matters
GST mistakes cost businesses lakhs in penalties and interest. Learn from others' errors and stay compliant!
1. Wrong HSN/SAC Codes
Mistake: Using incorrect HSN codes → Wrong tax rate, ITC rejected
Solution: Use HSN Finder to verify
2. Not Reconciling GSTR-2B
Mistake: Claiming ITC without checking GSTR-2B
Solution: Always reconcile before filing GSTR-3B
3. Missing 180-Day Payment Rule
Mistake: Not paying suppliers within 180 days
Solution: Pay within 150 days, track with reminders
4. Claiming Blocked ITC
Mistake: Claiming ITC on motor vehicles, food (Section 17(5))
Solution: Use ITC Calculator
5. Late Filing
Mistake: Filing returns late, even by 1 day
Solution: Set reminders 3 days before due date
6. Not Filing Nil Returns
Mistake: Skipping returns when no transactions
Solution: Always file nil returns - ₹500 penalty if skipped
7. Wrong Invoice Format
Mistake: Missing mandatory fields on invoices
Solution: Include GSTIN, invoice #, date, HSN, tax breakup
8. IGST vs CGST+SGST Confusion
Mistake: Wrong tax type for transaction
Solution: Inter-state = IGST, Intra-state = CGST+SGST
9. Poor Record-Keeping
Mistake: No digital backups, messy records
Solution: Keep all invoices 6 years, use accounting software
10. Ignoring Notices
Mistake: Not responding to GST portal notices
Solution: Check portal weekly, respond within deadline