In this article
Reviewed October 2026. GST rates were rationalised in September 2025 and procedures such as the Invoice Management System and refund annexures have evolved since this article was first written. Verify current rules before acting, and see our latest GST & tax news.
Most GST notices are triggered by small, repeated errors rather than deliberate evasion. These are the ones we see most often.
The ten mistakes
- Wrong HSN/SAC or tax rate on invoices
- Claiming ITC without checking GSTR-2B
- Mismatch between GSTR-1 and GSTR-3B
- Missing the due date or skipping nil returns
- Wrong place of supply leading to CGST/SGST instead of IGST
- Ignoring reverse charge on notified supplies
- Claiming blocked credits
- Not issuing credit notes for returns or discounts
- Poor record keeping and missing invoices
- Ignoring portal notices and emails
How to prevent them
- Maintain a verified product and service master with HSN/SAC and rate
- Reconcile before filing, every month
- Use calendar reminders for all due dates
- Review your GST portal dashboard for notices weekly
- Get a periodic GST compliance review from a professional
Helpful tools & services
Need expert help with this?
Talk to the GstMan team. We will guide you step by step.
General information only; not professional advice. Rates, limits and due dates change. Verify with official sources or consult a professional. Reviewed October 2026. See our editorial policy.
