Is there an HSN digit length enforcement for IMS supplier entries?

Yes. For taxpayers with turnover > ₹5 Crores, 6-digit HSN/SAC codes are strictly mandatory. Supplier bills in IMS with 4-digit or invalid HSN codes create validation warnings.

What should I do if a supplier uploads a bill in IMS with the wrong HSN code?

If the incorrect HSN alters the GST rate or item classification, select 'Reject' in IMS and request the supplier to issue a GSTR-1A amendment with the verified 6-digit HSN code.

Does GSTR-1 Table 12 HSN Summary link directly to IMS inward bills?

No. Table 12 tracks outward sales HSN summary, while IMS manages inward purchase bills. However, inward HSN accuracy is vital for maintaining accurate Stock Item GST rate setups in Tally.

How can TrulyInvoice prevent HSN mismatches in Tally Prime?

TrulyInvoice AI extracts line-item HSN codes from vendor PDFs via OCR, verifies HSN validity online, and auto-creates or maps Stock Items in Tally Prime before posting F9 purchase vouchers.

IMS Reconciliation & HSN Summary Validation Rules (GST 2026)

Quick Summary: How Do HSN Summary Rules Apply to IMS Reconciliation?

Under 2026 GST rules, 6-digit HSN/SAC codes are mandatory for businesses with turnover > ₹5 Cr (4-digit for < ₹5 Cr). During IMS reconciliation, verify that supplier HSN codes match physical goods received. Incorrect HSN codes on vendor bills should be Rejected in IMS to compel supplier GSTR-1A amendments.

6-Digit Mandate: 6-digit HSN/SAC codes required for AATO > ₹5 Cr; 4-digit for AATO <= ₹5 Cr.
Section 122 Penalty: Using invalid HSN codes exposes businesses to ₹10,000 penalties per return.
Stock Master Sync: Inward HSN validation prevents wrong GST rate setups in Tally Stock Masters.
Online Validation: Use Tally Prime's 'Validate HSN/SAC Online' tool before posting vouchers.

1. GST HSN/SAC Code Digit Requirements (2026)

The Central Board of Indirect Taxes and Customs (CBIC) strictly enforces HSN/SAC code lengths on all tax invoices and return tables:

Business Turnover (AATO)	Mandatory HSN Digits	Applicable Tables
Above ₹5.00 Crores	6 Digits (Mandatory)	All B2B & B2C Invoices, IMS, GSTR-1 Table 12
Up to ₹5.00 Crores	4 Digits (B2B Supplies)	B2B Invoices, IMS, GSTR-1 Table 12
Chemicals & Hazardous Goods	8 Digits (Mandatory)	Specific notified Chapter 28/29 products

Automate HSN Extraction & Stock Creation in Tally

Extract verified 6-digit HSN codes directly from supplier PDFs via AI.

Data entry operators frequently enter dummy HSN codes (e.g. 9999 or 0000) when manually typing vendor bills in Tally, creating severe GST compliance warnings.

TrulyInvoice AI Solution: Upload supplier PDF bills or WhatsApp scans. AI auto-extracts verified line-item HSN codes, creates missing Stock Items in Tally, and posts F9 Purchase Vouchers in 15 seconds via Port 9000 local sync.

2. Resolving HSN Summary Validation Errors in Tally Prime

When exporting GSTR-1 or performing IMS reconciliation in Tally Prime, follow these steps to resolve HSN summary validation errors:

Go to Gateway of Tally > Display More Reports > GST Reports > GSTR-1.
Check the section Incomplete/Mismatch in information (to be resolved).
Drill down into HSN/SAC details invalid or missing. Select the stock item and update with the correct 6-digit code.
Use Tally Prime's Validate HSN/SAC Online button to verify codes against official GST portal databases.