India GST Compliance

About India GST Compliance

Validate GSTIN checksums, CGST/SGST/IGST combination logic, HSN/SAC code format, and the ₹5 crore e-invoice (IRN) mandate on a GST invoice export.

India's GST regime bundles several distinct compliance requirements into every single invoice line, and getting any one of them wrong is a common reason returns get rejected or flagged during reconciliation. This tool runs four checks in one pass over a GST invoice export instead of catching each problem separately, later, and manually.

First, it verifies the 15-character GSTIN using the same factor-weighted checksum algorithm the GSTN portal itself uses, catching transposed digits and typos before they reach a filing. Second, it checks that CGST/SGST and IGST were never both applied to the same line — that combination signals an intra-state versus inter-state classification mistake, one of the most common invoice errors under GST.

Third, it validates that HSN/SAC codes are present and correctly formatted, since missing or malformed codes are a routine rejection reason. Fourth, it checks turnover against the ₹5 crore e-invoicing threshold and flags any invoice that should carry an IRN but doesn't — a mandate that's been lowered progressively and easy to lose track of if your systems weren't updated when the threshold last changed.

None of these checks confirm a GSTIN is actually registered and active on the GSTN portal — that still requires the official lookup — but catching structural errors locally, before filing, avoids the slower feedback loop of finding out only after a return is rejected.

The India GST Compliance tool is compatible with: GSTN E-Invoicing, Indian GST Returns.

Run this on a GST invoice export before filing, then use Invoice Sequence Auditor on the same batch since gap-free sequential numbering is also required under most GST reconciliation checks.

Built for Indian businesses and accountants filing GST returns who need to catch GSTIN and HSN errors before a return gets rejected.