Overview

• Relief applies to registered taxpayers whose principal place of business is in Mumbai City, Mumbai Suburban, Thane, Raigad or Palghar.
• The original due date was August 20, and filings completed by August 27 will avoid late fees and penalties.
• The CGST Mumbai Zone announced the extension in an official post on X.
• The measure covers July 2025 returns only and does not change national GST filing rules.
• GSTR-3B is the monthly summary GST return used to report outward and inward supplies and pay net tax liability.