Most manufacturing businesses lose between 8 and 15 percent of eligible GST input tax credit every quarter. The common explanation is compliance gaps. The actual cause is a data collection problem that no compliance process can fix on its own.
Where Credits Go Missing
Reconciliation failures happen when purchase invoices are not matched to supplier returns (GSTR-2A/2B) within the filing window. The gap is created by data entry delays, mismatched invoice details, and a purchase register that runs two to three weeks behind actual receipts.
The Three Failure Modes
- Invoice not in system when supplier files return — credit missed for that period.
- PO number mismatch between ERP and supplier invoice — creates a discrepancy requiring manual resolution.
- Input service credits on maintenance and logistics bills not captured because the team only tracks goods purchases.
What Changes When Data Is Collected at Source
When purchase data moves into the system at the point of receipt — not at the end of the month — the match rate for GSTR-2B reconciliation goes above 95 percent. A manufacturing business spending significant sums on GST-eligible purchases monthly typically recovers a meaningful share of previously missed credit annually.
Three Changes That Stop the Leakage
- Purchase register updated on goods receipt, not at invoice approval.
- Supplier GSTIN validated at PO creation — catches mismatches before the invoice arrives.
- Input service invoices (maintenance, freight, professional fees) captured in the same workflow as goods invoices.
