Missing a GST return due date triggers automated tracking on the GST common portal. When a return such as GSTR-3B, GSTR-4, or the final return GSTR-10 is not furnished, the tax department initiates legal default proceedings. For taxpayers who routinely track outward supplies and inward credits, ignoring non-filing alerts can escalate quickly into heavy assessments, similar to departmental scrutinies covered in our guide on GST notices after reconciliation.
What is a GSTR 3A notice?
A GSTR 3A notice is governed by statutory provisions under the Central Goods and Services Tax Act. According to Section 46 of the CGST Act, 2017, where a registered person fails to furnish a return under Section 39 (such as GSTR-3B) or Section 44 (annual return) or Section 45 (final return), a notice shall be issued requiring them to furnish such return within 15 days in such form and manner as prescribed under the rules.
Rule 68 of the CGST Rules specifies that this notice to return defaulters must be issued electronically in Form GSTR-3A. The notice serves as a formal legal demand instructing the taxpayer to clear the default immediately.
Common mistake: Treating Form GSTR-3A as a routine reminder email. It is a formal statutory notice. Failing to file within the 15-day period empowers the tax officer to proceed directly to unilateral assessment.
The 15-day timeline and best judgment risk under Section 62
The standard operating procedure for handling return defaulters is laid down in CBIC Circular No. 129/48/2019-GST. Para 3 of the circular explains the exact sequence following default:
“Section 46 read with rule 68 requires notice in FORM GSTR-3A to a defaulter requiring him to furnish return within fifteen days. Further section 62 provides for assessment of non-filers of return who fail to furnish return under section 39 or section 45 even after notice under section 46. As such, no separate notice is required to be issued for best judgment assessment under section 62 and in case of failure to file return within 15 days of issuance of FORM GSTR 3A, the best judgment assessment in FORM ASMT-13 can be issued without any further communication.” CBIC Circular No. 129/48/2019-GST, Para 3
Under Section 62(1) of the CGST Act, 2017, if the return is not filed within 15 days of Form GSTR-3A service, the proper officer can assess tax liability using available data, such as your outward supplies reported in GSTR-1, e-way bill generation details, or inward supplies recorded in your recipient data. The officer then issues an assessment order in Form GST ASMT-13.
In addition, under Rule 142(5) of the CGST Rules, a summary of this order is electronically uploaded in Form GST DRC-07, which creates an immediate enforceable liability in your electronic liability register.
Worked example: financial impact of best judgment assessment
Consider M/s Progressive Engineering, a registered firm in Maharashtra. The firm omitted filing GSTR-3B for August 2026. The department served a GSTR 3A notice on 25 September 2026 giving 15 days to file.
If Progressive Engineering files the return within 15 days, their actual taxable outward supply liability is reconciled against eligible input tax credit. However, if they fail to file by 10 October 2026, the proper officer issues an ASMT-13 order on best judgment using outward GSTR-1 data without allowing unverified input tax credits.
| Item description | Actual books and filing within 15 days | Best judgment order under Section 62 (ASMT-13) | Impact on cash outflow |
|---|---|---|---|
| Outward taxable supplies | ₹10,00,000 | ₹10,00,000 | Equal tax base assessed |
| Output tax liability (18% IGST) | ₹1,80,000 | ₹1,80,000 | Assessed on full reported turnover |
| Input tax credit eligible in GSTR-2B | ₹1,20,000 | ₹0 | ITC disregarded in unilateral assessment |
| Net tax demanded | ₹60,000 | ₹1,80,000 | Excess cash burden of ₹1,20,000 |
Formula for net cash payable in self-assessment: Output tax liability (₹1,80,000) minus eligible ITC (₹1,20,000) equals ₹60,000 plus applicable interest and late fees. In best judgment assessment, the officer demands the entire ₹1,80,000 plus interest and penalties via Form GST DRC-07.
Step-by-step workflow to close a GSTR 3A notice
- Locate the notice on the GST portal: Log in to the common portal and navigate to Services → User Services → View Notices and Orders. Check the notice date and compute the 15-day cutoff.
- Reconcile purchases and outward invoices: Collate your sales registers and reconcile purchase invoices against your auto-populated GSTR-2B to ensure all eligible credits are claimed.
- Pay applicable late fees and interest: The portal automatically calculates statutory late fees under Section 47. Compute interest under Section 50 on net cash liability.
- File the overdue return: Submit and file Form GSTR-3B using EVC or digital signature certificate (DSC). Once the valid return is furnished, default proceedings are dropped.
Frequently asked questions
What is a GSTR 3A notice?
A GSTR 3A notice is a statutory notice issued under Section 46 of the CGST Act read with Rule 68 to a registered taxpayer who has failed to file a periodic return, such as GSTR-3B, GSTR-1, GSTR-4, or final return GSTR-10, by the prescribed due date.
How much time do I have to reply or file after receiving Form GSTR-3A?
You have exactly 15 days from the date of service of the GSTR 3A notice to furnish the pending return along with applicable late fees and interest.
Does the tax officer issue another notice before passing a best judgment order under Section 62?
No. Under CBIC Circular No. 129/48/2019-GST, no separate notice is required before issuing a best judgment assessment order in Form GST ASMT-13 if you fail to file within 15 days of Form GSTR-3A.
Reconcile your purchase register before filing
To respond quickly to a GSTR 3A notice, ensure you claim every rupee of eligible credit without errors. Your GSTR-2B and purchase register files are read in your browser and never uploaded to any server.
Last checked: 25 October 2026. Sources: CBIC Tax Information Portal, CBIC Circulars Repository.