What Actually Triggers a GST Scrutiny Notice

Notices come from mismatches, not random checks

GST scrutiny is largely system-driven — the portal cross-checks your filings against each other and against your suppliers' filings, and a notice usually follows a specific mismatch rather than a random audit. Understanding what's actually being compared is the fastest way to avoid triggering one.

GSTR-1 vs GSTR-3B mismatch

GSTR-1 declares your outward supplies in detail; GSTR-3B is your summary return with tax payment. When the total outward tax liability in these two doesn't reconcile, it's one of the most common scrutiny triggers, since the same figure is meant to appear consistently across both.

Input tax credit claimed beyond GSTR-2B

Claiming input tax credit that exceeds what your suppliers have actually reported in their own filings — reflected in your auto-populated GSTR-2B — is a direct, easily-flagged mismatch. This is why reconciling against GSTR-2B monthly, not just trusting your own purchase register, matters so much.

E-way bill and turnover inconsistencies

A pattern of e-way bills generated for movements that don't correspond to declared turnover, or turnover that looks inconsistent with the scale of GST paid, draws attention. This is less about one mistake and more about a pattern the system notices across several filings.

A worked example

A business's GSTR-3B consistently showed lower liability than its GSTR-1 by a small, recurring margin — each month individually looked like a rounding difference, but the accumulated pattern across two quarters was enough to trigger a scrutiny notice. Reconciling the two returns before filing, every month, would have caught the recurring gap early.