Verify a GST communication using the official identifier shown on it: a GSTN Reference Number (RFN), a Document Identification Number (DIN), or an eOffice Issue Number. The routes differ, so use the verifier that matches the document. The Directorate General of GST Intelligence (DGGI) advises recipients not to act on suspicious communications until the relevant identifier has been validated.
Which identifier should you check?
Not every GST communication uses the same identifier. DGGI says official DGGI and related GST communications may be checked using a DIN, an eOffice Issue Number, or a GSTN RFN, depending on the issuing platform and document type. Match the identifier printed on your communication to its corresponding official verifier rather than expecting every document to carry all three.
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| Identifier | When it applies | Official check |
|---|---|---|
| GSTN Reference Number (RFN) | System-generated notices or orders on the GST common portal. | Use the GST portal’s Verify RFN service, before or after login. |
| Document Identification Number (DIN) | Communications issued under the DIN system. | Use CBIC’s DIN Search page. |
| eOffice Issue Number | Communications carrying an eOffice issue number. | Use CBIC’s eOffice document verifier. The number is formatted I/1234567/YYYY and appears at the document’s top right. |
DGGI’s instruction is explicit: “Do not act on suspicious communication unless the relevant DIN, RFN No., or eOffice Issue No. is validated.” See the DGGI Public Services page, GST portal Verify RFN service, and CBIC’s DIN Search and eOffice document verification pages.
How to verify a GST portal notice or order with its RFN
GSTN’s advisory dated 25 September 2024 directs taxpayers to verify the RFN for system-generated notices and orders. You can start without signing in, or use the logged-in route:
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- Before login: Open GST portal Services, then use the Verify RFN link under the GST services/quick links area.
- After login: Go to Dashboard > Services > User Services > Verify RFN.
- Enter the RFN shown on the notice or order and submit it. Use the portal result to check the document’s validity, issuer, and purpose.
These routes are described in GSTN’s 25 September 2024 advisory on notices and orders without visible digital signatures. If the details returned by the portal do not match the communication, do not rely on the document or on contact details contained only in it; seek confirmation through the relevant official portal or department channel.
A missing visible digital signature does not prove a PDF is fake
Some documents generated through the GST portal—such as show-cause notices, assessment orders, and refund orders—may not display a visible digital signature on the downloaded PDF. GSTN explains that they are generated through an officer’s digitally authenticated portal session, while document data and issuing-officer details are stored in the GST system with the officer’s digital signature. For those portal-generated documents, check the RFN rather than treating the missing visible signature as proof of forgery.
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If the communication is a summons
First verify its identifier using the route that matches it. For a Notice to Summon in an enforcement case, GST Portal documentation describes a reply function for logged-in taxpayers:
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- Log in to the GST portal.
- Go to Services > User Services > View Additional Notices and Orders.
- Open the Notices folder and select Reply for Notice to Summon.
The portal documentation also describes a Request for Adjournment function for such replies. These are portal features, not guidance on the legal merits of a summons, the applicable deadline, or what a recipient should say. Review the specific communication and obtain qualified tax advice if you are unsure how to respond. The functionality is described in the GST Portal’s December 2022 compilation of taxpayer features.
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Do not decide authenticity from formatting alone
A typo, omission, or other defect may be a reason to verify a communication, but it does not automatically establish that proceedings are invalid. Section 160 of the CGST Act addresses mistakes, defects, or omissions in proceedings and service of communications, and provides that certain defects do not invalidate them when proceedings are substantively in conformity with legal requirements. That provision does not determine whether a particular document is genuine or legally valid. For a specific dispute, consult the CBIC tax-information portal for legislation and related material and seek advice from a qualified tax professional.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Practical precautions when a GST message seems suspicious
- Do not pay, disclose credentials, or take other action solely because a message demands urgency. Validate its DIN, RFN, or eOffice Issue Number through the matching official verifier first.
- Use government portal addresses reached independently, not just links or phone numbers included in an unexpected message.
- Compare the verification result with the communication’s issuer and purpose. A successful check for an identifier does not, by itself, settle what response a particular case requires.
- If the identifier is absent, cannot be validated, or returns information that does not match, pause and seek confirmation from the issuing department through an official channel.
The official sources cited here establish identifier-verification routes and portal functions; they do not provide one comprehensive checklist of scam tactics or a single reporting channel for every GST-related scam. The steps above are safeguards, not a finding about any individual message.
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