The due date for the next GST payment depends on the type of GST payment and the taxpayer's filing category. For monthly filers and regular taxpayers with turnover above ₹5 crore, the GSTR-3B payment for August 2025 is due on September 20, 2025. For QRMP scheme taxpayers filing quarterly, the GSTR-3B quarterly return for July-September 2025 is due in mid-October, but the monthly payment obligation continues through September and the monthly QRMP payment for August 2025 is due by September 25, 2025. In summary:

• GSTR-3B (monthly filers, turnover above ₹5 crore): Payment due September 20, 2025.
• QRMP monthly payment for August 2025: Due September 25, 2025.
• GSTR-3B quarterly QRMP (July-September 2025): Due mid-October 2025 (monthly payments continue in September).

The exact amount will depend on the GST liability computed in the relevant return period based on supplies and input tax credits.