GSTR-3B is a summary return that must be filed monthly by businesses to report inward and outward supplies under the Goods and Services Tax (GST) introduced in India. BTHAWK software allows small and medium businesses to easily file their GSTR-3B returns online and make tax payments through challans or online payment. Users must verify their return with an OTP, digital signature, or Aadhar-based e-sign. Recent changes to the GSTR-3B filing form by the GSTN include allowing taxpayers to see tax liability breakdown before submission and downloading a challan for cash tax amounts due.