Why Input Tax Credit (ITC) is Lower in GSTR-2B: Root Causes & Resolution SOP
July 24, 20268 min readAkib Husain
Why Input Tax Credit (ITC) is Lower in GSTR-2B: Root Causes & Resolution SOP
Troubleshooting guide for tax accountants to identify why GSTR-2B ITC falls short of internal purchase ledgers and how to resolve supplier filing gaps.
Who is this for: GST Troubleshooting SOP
Quick Answer: Why Is ITC Lower in GSTR-2B Than Purchase Books?
GSTR-2B ITC is lower when suppliers fail to file GSTR-1 before the 13th monthly cutoff, tag invoices as B2C, or enter incorrect GSTINs. Never claim provisional credit past GSTR-2B totals; follow up with non-compliant suppliers to amend their GSTR-1 in the subsequent period.
- GSTR-2B is generated on the 14th of every month as a static statement.
- Suppliers filing GSTR-1 after 13th midnight roll over to next month's GSTR-2B.
- B2C invoice tagging by vendors excludes credit from your auto-drafted statement.
- TrulyInvoice AI extracts vendor GSTINs and invoice numbers with 96% accuracy.
1. Top 5 Reasons for GSTR-2B Shortfall
- Supplier Cutoff Miss (13th Midnight): Invoices uploaded by vendors after the 13th of the month are pushed to the following month's GSTR-2B statement.
- B2C Upload Errors: Vendors mistakenly uploading tax invoices as B2C sales omit recipient GSTIN, blocking auto-population in GSTR-2B.
- Typographical GSTIN Errors: Minor typos in your GSTIN push credits to another taxpayer's electronic credit statement.
- Credit Note Deductions: Vendor credit notes issued during the tax period reduce your net available ITC in GSTR-2B Table 3.
- Section 17(5) Ineligible Tagging: Portal automatically flags motor vehicles, catering, or personal expenses as ineligible credit.
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Akib HusainExpert Reviewer
Founder & Chief Architect of TrulyInvoice
Last Verified: July 24, 2026
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