Why is my GSTR-3B Filing Blocked? Understanding the New ITC Re-claim Ledger Validation (January 2026 Update)

GSTR-3B filing button disabled on GST portal due to ITC re-claim ledger validation error.

If you logged into the GST portal this week to file your monthly returns and found that the “File” button is disabled or greyed out, you are not alone. As of January 1, 2026, the GST Network (GSTN) has shifted from “Soft Validation” (warnings) to “Hard Validation” (blocking). The primary culprit behind this frustration is … Read more