New GSTR-3B Filing Process 2026: Hard-Locking, Auto-Population & Due Dates Explained A complete, up-to-date guide for taxpayers and accountants on how the new GSTR-3B works and how to file it correctly. GSTR-3B is a monthly (or quarterly, under the QRMP scheme) self-declared summary return in which every GST-registered taxpayer reports outward tax liability, claims input […]