Key September 2025 GST Due Date:

Key September 2025 GST Due Date As we enter the month of September, it is time for the GST-registered businesses to stay alert for the upcoming GST due dates in this month. If you are a registered taxpayer and you fail to file the returns on time, then this can result in interest, late fees and also affect your input tax credit (ITC) claim. To avoid the consequences of missing the deadline, read below the important GST Due Date for September 2025.

Also Read

Key September 2025 Income Tax Due Date

GSTR-3B: Monthly and Quarterly

GSTR-3B is the summary of the outward and inward supplies, tax liability, and input tax credit for the month.

• Monthly Filing: For monthly filers, the due date for filing of Form GSTR-3B (For August 2025) is September 20, 2025.
• Quarterly Filing: For Quarterly filers, the due date of filing GSTR-3B (for July to September 2025) is October 22 and 24, 2025.

GSTR-1: Monthly and Quarterly

GSTR-1 is a form that has the details of outward supplies of goods or services or both.

• Monthly Filing: The due date for the monthly filing of GSTR-1 (For August 2025) is September 11, 2025.
• Quarterly Filing: The due date for the quarterly filing of GSTR-1 (for July to September 2025) is October 13, 2025.

Also Read

GST Registration: Which Taxpayers Are Required to Obtain GST Number?

IFF (Invoice Furnishing Facility)

The IFF, or Invoice Furnishing Facility, is a facility where the quarterly GSTR-1 under the QRMP scheme can choose to file their B2B invoices every month. The due date for the monthly filing of IFF (for August 2025) is September 13, 2025.

CMP-08

Form CMP-08 is used by a composition taxable person to report the summary of their self-assessed tax payable for a given quarter. The due date to file Form CMP-08 (for July to September 2025) is October 18, 2025.

GSTR-5

GSTR-5 must be filed by the non-resident taxable person who makes supplies in India but does not have a fixed place of business in India. The due date to file GSTR-5 (for August 2025) is September 13, 2025.

GSTR-6

GSTR-6 is a GST return filed by the Input Services Distributor (ISD) for the distribution of ITC among its other units. The due date to file GSTR-6 (August 2025) is September 13, 2025.

GSTR-8

GSTR-8 is a GST form filed by e-commerce operators who are required to deduct tax collected at source (TCS) under the GST law. The due date to file GSTR-8 (for August 2025) is September 10, 2025.

GSTR-5A

GSTR-5A must be filed by non-resident Online Information and Database Access or Retrieval (OIDAR) services providers. The due date to file GSTR-5A (for August 2025) is September 20, 2025.

Also Read

DTAA with Switzerland Does Not Exempt Assessee from TDS Obligation on Interest Paid Abroad: ITAT Chennai

GSTR-7

GSTR-7 must be filed by the individuals who deduct TDS (Tax Deducted at Source) under the GST law. The due date to file GSTR-7 is September 10, 2025.

RFD-10

Form RFD-10 is a refund application made by embassies, UN bodies, and other notified organisations to claim refunds on tax paid on inward supplies. The due date for filing this form is within two years from the last day of the quarter in which the supply was received.