GST-registered businesses need to periodically file returns declaring their sales, purchases, and tax liability — mainly GSTR-1 (outward supplies) and GSTR-3B (summary return with tax payment), on a monthly or quarterly basis depending on eligibility.
Official website
GST Portal (GSTN)
https://www.gst.gov.in
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Log in to the GST portal (gst.gov.in) with your GSTIN credentials.
Prepare GSTR-1 with details of your outward supplies (sales) for the period.
File GSTR-1 by the due date applicable to your filing frequency (monthly, or quarterly under QRMP).
Review the auto-populated purchase/input tax credit details relevant to GSTR-3B.
Prepare and file GSTR-3B, the summary return declaring tax liability and paying any tax due.
Authenticate the filing using a Digital Signature Certificate (DSC) or Electronic Verification Code (EVC).
Download the filed return acknowledgment for your records.
Official fees
Filing itself is free on the GST portal; late filing after the due date attracts a late fee and interest as prescribed under GST rules.
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GSTR-1 reports the details of your outward supplies (sales), while GSTR-3B is a summary return where you declare total tax liability and make the payment.