GST GSTR-3B (Monthly Return) for December 2025
Due Date: Jan 20, 2026
The GSTR-3B return — a monthly self-declaration of outward supplies and tax liabilities for the period ending December 2025 — must be filed by 20th January 2026. This form is required from regular and certain quarterly filers depending on turnover thresholds and QRMP scheme participation.