In my years of handling GST compliance for businesses across Pune, Nagpur, and across India, I've seen the same mistakes trigger notices repeatedly. The good news? Almost all of them are preventable. Here are the 5 most common GST mistakes that invite tax department scrutiny — and exactly what you should do instead.
Your GSTR-1 (sales details) and GSTR-3B (summary return with tax payment) must match. If you report ₹50 lakhs in GSTR-1 but only ₹40 lakhs in GSTR-3B, the system flags it automatically. This is the #1 cause of GST notices in India.
Fix: Reconcile your GSTR-1 and GSTR-3B every month before filing. Use your accounting software to generate the reconciliation report. Any difference must be explained with a credit note or amendment.
Under GST, you can only claim Input Tax Credit (ITC) if your supplier has filed their GSTR-1 and the credit appears in your GSTR-2B. Many businesses claim ITC based on purchase invoices without checking GSTR-2B — this is a direct invitation for a notice under Section 16.
Fix: Always check GSTR-2B before filing GSTR-3B. Only claim ITC that is reflected in GSTR-2B. Follow up with non-compliant suppliers immediately.
Many businesses don't realize that certain services attract Reverse Charge Mechanism (RCM) — meaning you pay GST even if the supplier is unregistered. Common examples: freight from unregistered GTA, legal fees, import of services, security services. Ignoring RCM is a major compliance gap.
Fix: Identify all RCM-applicable transactions in your business. Pay GST on them under RCM, then claim ITC in the same month. Maintain a monthly RCM register.
Since FY 2021-22, 4-digit HSN codes are mandatory for turnover above ₹5 crore (6-digit for B2B). Many businesses still file with wrong or missing HSN codes, or use an HSN code that doesn't match the product being sold. This affects your buyers' ITC claims and exposes you to scrutiny.
Fix: Create a master product-HSN mapping in your accounting system. Review it annually as HSN codes occasionally change. Your CA can verify the correct codes.
GSTR-9 is the annual reconciliation of all your monthly returns. Many businesses skip it (thinking it's optional once turnover is below the exemption limit) or file it without reconciling the numbers against their books. Discrepancies here trigger scrutiny notices for the entire year.
Fix: File GSTR-9 even when optional — it protects you. Reconcile turnover, ITC, and tax paid against your audited financials before filing. Hire a CA for GSTR-9C (reconciliation statement) if your turnover exceeds ₹5 crore.
What to Do If You've Already Received a GST Notice
Don't ignore it — that makes things worse. Check the notice type (ASMT-10, SCN, DRC-01), understand what's being alleged, and respond within the stipulated time. Most GST notices can be resolved with proper documentation and a well-drafted reply.
In our practice, we've resolved over 85% of GST notices without any additional tax payment by providing the right reconciliation data and written response.
A Quick GST Compliance Checklist (Monthly)
- Reconcile GSTR-1 vs GSTR-3B before filing
- Check GSTR-2B and match with purchase register
- Identify and pay RCM liabilities before month-end
- Verify HSN codes on all sales invoices
- Reconcile e-way bill data with GSTR-1
- Reverse ITC for any goods returned or supplier deregistered
Got a GST Notice? Or Want to Audit Your GST Compliance?
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