🚨 1. Incorrect or Missing Invoices

Mistake:
Uploading wrong invoice details or missing invoices altogether.

How to Avoid:
Maintain a clear record of all taxable transactions. Use automated accounting software that syncs invoices directly to the GST portal.

📝 2. Mismatch Between GSTR-1 and GSTR-3B

Mistake:
Data in GSTR-1 (sales return) doesn’t match the summary in GSTR-3B (monthly summary return).

How to Avoid:
Reconcile data before filing. Always cross-verify totals manually or using reconciliation tools.

💡 3. Ignoring ITC Reconciliation

Mistake:
Claiming Input Tax Credit (ITC) without reconciling with GSTR-2B or vendor filings.

How to Avoid:
Regularly check GSTR-2B and only claim eligible ITC supported by valid documents.

📅 4. Late Filing of Returns

Mistake:
Delays in filing returns attract late fees and interest.

How to Avoid:
Set reminders or use a GST compliance calendar. Opt for professional help if return tracking becomes difficult.

📌 5. Not Reporting Nil Returns

Mistake:
Failing to file Nil returns when there’s no business activity.

How to Avoid:
File Nil returns on time to stay compliant — penalties apply even for zero transactions.

🧾 6. Wrong HSN/SAC Codes

Mistake:
Using incorrect HSN (for goods) or SAC (for services) codes.

How to Avoid:
Refer to the official HSN/SAC directory and update your billing system accordingly.

🔍 7. Missing Amendments or Corrections

Mistake:
Overlooking the option to amend previous errors in the upcoming return period.

How to Avoid:
Review past filings regularly and file necessary amendments promptly.

✅ Conclusion

Avoiding these GST filing mistakes can save your business time, money, and unnecessary stress. If GST compliance feels overwhelming, consulting a qualified CA or CMA can ensure error-free, timely filings.