Use the GST common portal’s Verify RFN service before trusting a notice. Open https://services.gst.gov.in/services/verifyRfn yourself, enter the notice’s Reference Number (RFN), and compare the returned record with the document. Then sign in at gst.gov.in and check Dashboard → Services → User Services → Additional Notices & Orders. For a communication issued by the Central Board of Indirect Taxes and Customs (CBIC), verify its Document Identification Number (DIN) when applicable.
A successful RFN or DIN result confirms that a communication record exists and identifies the issuing office. It does not prove that the tax calculation, legal section, or demand is correct. Those still require your own review and, where necessary, advice from a qualified tax professional.
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What you need to verify
Keep the original PDF or paper notice in front of you, but do not use any hyperlink, QR code, phone number, or email address printed in it for the first check. Write down the following details exactly as shown:
- Reference Number (RFN), if the document was generated through the GST common portal
- Document Identification Number (DIN), if it is a CBIC communication that carries one
- Date of the notice or order and, separately, any date shown as the RFN-generation date
- Name of the issuing office and the officer or designation shown
- GSTIN, legal name, tax period, form number, amount demanded, and reply deadline
- Any email, postal address, telephone number, bank details, or payment instructions
Type gst.gov.in or cbic-gst.gov.in into your browser yourself. A genuine-looking email can still contain a fraudulent link that sends you to a copycat website.
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Preserve the file exactly as received before opening or annotating it. If it arrived by email, retain the message with its full headers; if it arrived by post, keep the envelope and delivery details. These details can help establish when and how the communication reached you if service or limitation later becomes an issue.
RFN and DIN: which number applies?
| Identifier | Where it is used | How to check it | Information returned |
|---|---|---|---|
| RFN (Reference Number) | Documents and communications generated through the GST common portal | GSTN’s pre-login Verify RFN page, or the post-login Verify RFN path | RFN-generation date, document date, module, communication type, and issuing office |
| DIN (Document Identification Number) | CBIC communications, including emails, where the DIN requirement applies | CBIC’s online DIN-verification facility or the official CBIC/GST channels identified for that communication | The DIN record and its associated communication details |
CBIC Circular No. 128/47/2019-GST, dated 23 December 2019, directed electronic generation and quoting of a DIN for communications, including emails, sent by CBIC offices. CBIC Circular No. 249/06/2025-GST, dated 9 June 2025, clarifies that a document generated through the GST common portal already carries an RFN; adding a second DIN to that portal-generated document is unnecessary. Therefore, do not reject a portal notice merely because it has no separate DIN, and do not treat a DIN as a substitute for an RFN when the document clearly originated in the GST portal.
The identifier tells you which verification route to use, not whether you agree with the assessment. A number copied from a genuine communication onto a forged PDF can still produce confusion, which is why the returned office, dates, module and communication type must be compared field by field.
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Inspect the document offline
Open the PDF or read the paper copy without following its embedded links. Confirm that the RFN is legible and record the document date, office, tax period, form, GSTIN, amount, deadline, and contact details. Save the original file in its received form; do not rely on a forwarded or edited copy.
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Open the official Verify RFN page
Navigate directly to https://services.gst.gov.in/services/verifyRfn. GSTN says this service is available without signing in. Enter the RFN exactly as printed, including letters, numbers, and punctuation, then submit the form.
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Match every returned field
The result should show the RFN-generation date, date of issuing the document, module, type of communication, and name of the issuing office. Compare each value with the notice rather than checking only whether a number produces a result. A different office, date, module, or communication type is a material mismatch.
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Check the logged-in record
Sign in by typing https://www.gst.gov.in/ yourself. Follow Dashboard → Services → User Services → Additional Notices & Orders. GSTN’s functionality documentation places additional notices and orders there, along with relevant summaries. Look for the same communication and the related summary, if one exists.
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Check the applicable summary
For a demand notice, look for the corresponding Form GST DRC-01 summary when applicable. For an order, look for the related DRC-07 summary when applicable. The summary should relate to the same GSTIN, tax period, proceeding, and amount described in the document. A summary is a cross-check, not a replacement for reading the full notice.
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Preserve the verification evidence
Download or print the portal result where the facility permits it, and take dated screenshots showing the RFN and returned metadata. Keep those images with the original notice, email headers, and your response records.
Use the same browser session to note the exact page address and the date and time of the check. If the result changes later, your contemporaneous screenshot shows what the portal displayed when you investigated. Never alter a screenshot to crop out a mismatch; retain both the complete image and any marked-up working copy.
How to verify a CBIC DIN
If the communication is from a CBIC office and displays a DIN, use the official CBIC verification route rather than a link supplied in the message. Enter the DIN exactly as printed and compare the result with the office, date, subject, and recipient details on the communication. A missing or invalid DIN is a serious warning for a communication that should carry one, but it is not a reason to demand a DIN from every document: portal-generated GST documents are identified through their RFN under the 2025 CBIC clarification.
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Does a GST notice need a visible digital signature?
No visible signature on a PDF does not, by itself, establish that the notice is fake. GSTN describes portal communications as generated through an officer login authenticated with a digital signature. The reliable test is whether the RFN record and the logged-in notice correspond to the document, not whether a scanned signature image appears on every page.
A signature issue can still matter in a legal challenge, especially if the document is not a portal-generated communication or the issuing authority is unclear. Treat that as a legal question after authentication, not as a substitute for checking the RFN or DIN.
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Do not “repair” a questionable PDF by adding a signature image, converting it to another format, or asking the sender to resend it through an unverified address. Keep the original and seek confirmation through the portal or the helpdesk.
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Authentication answers “Did this communication come through the stated system and office?” It does not answer “Is the demand right?” Once the record matches, review the document itself:
- Legal basis: Read every cited section, rule, notification, and form reference. Check that the provision applies to the transaction and period named.
- Tax period: Confirm that the period is one for which you were registered or liable and that it matches your returns, invoices, and books.
- Computation: Recalculate taxable value, tax, interest, late fee, and penalty. Check credits, payments, amendments, and any amounts already adjudicated.
- Procedural dates: Note the issue date, service date if stated, reply deadline, hearing date, and any limitation period. Do not assume that verifying the document extends a deadline.
- Recipient and GSTIN: Make sure the legal name and GSTIN belong to you or your business. A real notice addressed to another taxpayer can still be the wrong document for your account.
If the figures or legal reasoning are disputed, obtain advice from a chartered accountant, GST practitioner, or tax lawyer promptly enough to meet the stated deadline.
Separate the authentication file from the merits file. The first should contain the RFN or DIN result and account record; the second should contain returns, invoices, reconciliations, challans and legal submissions. This separation makes it easier to show that you challenged the calculation without losing evidence about the document’s origin.
What to do when Verify RFN shows no record
Do not pay, download software, disclose an OTP, or reply with identity documents while the communication is unverified. Work through these checks in order:
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- Re-enter the RFN manually. Common errors include confusing zero with the letter O, omitting a prefix, or adding a space.
- Try the service again from the official address after signing out of unrelated browser tabs. Do not use a shortened link or a search-ad result that redirects elsewhere.
- Check whether the document is actually a CBIC communication that should be verified by DIN, or a portal document that should be checked by RFN.
- Sign in to Additional Notices & Orders and search the relevant period and GSTIN. A notice may be visible there even when a copied number was entered incorrectly.
- Compare the document’s office, date, form, and GSTIN with any record you find. A record for a different proceeding does not validate the document you received.
- If no corresponding record exists, preserve the email with its full headers, the PDF, envelope or postal cover, and screenshots of the failed search. Contact GSTN through 1800-103-4786 or the official helpdesk at https://selfservice.gstsystem.in.
A temporary portal outage can produce the same “no result” symptom as a forged number. The helpdesk can establish whether the service was unavailable, but it cannot decide the merits of a tax dispute.
Do not wait indefinitely for the portal to recover. Note the deadline immediately, tell your adviser that verification is pending, and ask what protective filing or written clarification is appropriate. Keep proof of every failed attempt, including the time, URL and error message.
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Red flags that deserve extra caution
| Observed sign | Why it matters | Safe response |
|---|---|---|
| The email demands immediate payment to a personal account, wallet, or unfamiliar bank account | GST verification does not authorize payment to an unverified recipient | Stop and verify through the portal; use only payment instructions that you independently confirm in your official account |
| The message asks for an OTP, password, remote-access installation, or screen sharing | Those requests are not needed to run Verify RFN | Do not disclose credentials or install anything; report the message and preserve evidence |
| RFN result exists but the office, date, module, or communication type differs | A valid number may have been copied onto another document | Treat the mismatch as suspicious and contact GSTN before responding through the message |
| The notice has a GSTIN or tax period that is not yours | The document may be misdirected or fabricated | Do not reply with confidential records; ask the official helpdesk how to correct the record |
| A portal notice is rejected because it lacks a separate DIN | Portal-generated documents use RFN under the CBIC 2025 clarification | Check the RFN and logged-in notice instead of assuming a DIN is required |
Urgency alone is not proof of fraud: genuine notices can have short statutory deadlines. The warning sign is pressure to bypass the official portal, pay a person, reveal credentials, or ignore a metadata mismatch.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Pre-login versus post-login checking
| Method | Best use | What it can establish | Limit |
|---|---|---|---|
| Pre-login Verify RFN | Fast first check when you receive a PDF, letter, or email | Whether the RFN corresponds to a GST system record and the key metadata returned by GSTN | It does not show your complete account history or decide whether the assessment is correct |
| Post-login Verify RFN | Confirming that the communication belongs to your taxpayer account | The authenticated portal record and its relationship to your GSTIN | You still need to read the notice and meet its deadline |
| Additional Notices & Orders | Finding the notice, order, and applicable DRC-01 or DRC-07 summary | The account-level proceeding and related summaries maintained in the portal | Absence can require helpdesk follow-up; it is not permission to ignore a deadline without advice |
| DIN verification | Checking a CBIC communication that carries a DIN | The CBIC communication record associated with that DIN | It is not the primary identifier for a document generated through the GST common portal |
Use the methods together rather than treating them as competing options. Pre-login checking is the quickest way to test a newly received document. Post-login checking connects it to your account, while Additional Notices & Orders can reveal the related proceeding or summary. DIN verification applies to the CBIC communications for which that identifier is required.
Keep a defensible record
Create one folder for the proceeding containing the original message, unmodified PDF, postal documents, portal screenshots, RFN/DIN results, return extracts, invoices, payment challans, and every reply. Use filenames that include the GSTIN, tax period, document date, and RFN or DIN. Record the date and time of each portal check and the browser address you used.
When replying, use the response mechanism specified in the authenticated portal record or the official notice—not the “reply” address in a suspicious email. Save the acknowledgement number and a copy of the submitted response. If you engage a professional, provide the complete record rather than only a screenshot of the first page.
Keep a simple chronology: receipt, each verification attempt, helpdesk contact, advice received, reply submitted and acknowledgement. Do not overwrite earlier versions of a notice or your response. A clear chronology helps distinguish a portal outage, a data-entry error and a genuinely fabricated communication.
When to escalate
- GSTN helpdesk: Use 1800-103-4786 or the GST self-service portal for a missing RFN result, a portal mismatch, or a technical inability to view Additional Notices & Orders.
- Tax professional: Get advice when the notice alleges under-reporting, denies input tax credit, proposes a penalty, involves multiple periods, or leaves too little time to prepare a reply.
- Security or law-enforcement reporting: If the sender sought money, OTPs, credentials, or remote access, preserve the evidence and report the suspected fraud through the appropriate cybercrime or financial-institution channel.
Do not let an authenticity dispute cause you to miss a genuine response date. Tell your adviser or the helpdesk that the verification is unresolved and ask what protective step is available while the record is checked.
The practical decision rule
Trust the communication only after its identifier, returned metadata, taxpayer account record, and substantive details line up. Use RFN for GST common-portal documents, DIN for applicable CBIC communications, and the logged-in Additional Notices & Orders page as the account-level cross-check. If any element conflicts, treat the message as suspicious, avoid its links and payment instructions, preserve evidence, and obtain official or professional assistance.
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Frequently Asked Questions
How do I verify a GST notice online?
Open GSTN’s official Verify RFN page at https://services.gst.gov.in/services/verifyRfn, enter the Reference Number exactly as printed, and compare the returned RFN-generation date, document date, module, communication type and issuing office. Then sign in at gst.gov.in and check Dashboard → Services → User Services → Additional Notices & Orders.
Where do I verify the RFN on a GST notice?
Use the pre-login Verify RFN service at https://services.gst.gov.in/services/verifyRfn. After login, GSTN also provides Verify RFN through Dashboard → Services → User Services → Verify RFN.
What is the difference between GST DIN and RFN?
RFN is the identifier attached to documents and communications generated through the GST common portal. DIN is the identifier for applicable CBIC communications, including emails. CBIC Circular No. 249/06/2025-GST says a portal-generated document already has an RFN, so a second DIN is unnecessary.
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A missing visible signature does not automatically make a portal notice fake. GSTN describes portal documents as generated through an officer login authenticated with a digital signature. Verify the RFN and the logged-in record first; obtain legal advice if signature or authority remains disputed.
What should I do if Verify RFN shows no record?
Re-enter the RFN manually, confirm whether the document should instead be checked by DIN, and look in Additional Notices & Orders. If there is still no matching record, do not pay or disclose OTPs; preserve the document and screenshots, then contact GSTN at 1800-103-4786 or https://selfservice.gstsystem.in.
Does an RFN match prove that the tax demand is correct?
No. It confirms that a communication record exists and identifies the issuing office. You must separately review the legal provisions, tax period, computation, credits, interest, penalty and response deadline.
Should every GST notice have both an RFN and a DIN?
No. Portal-generated GST documents use an RFN. A DIN applies to CBIC communications where the DIN requirement applies. Do not reject a portal notice solely because it has no separate DIN.
Can I use the phone number or payment link in the email to check the notice?
No. Type the official GST or CBIC address yourself and verify through the portal. Do not use an unverified payment link, disclose an OTP, install software or grant remote access while authenticity is unresolved.
The Bottom Line
Verify first, respond second: check the RFN or applicable DIN on the official portal, compare every returned field, confirm the record under Additional Notices & Orders, and then review the legal and numerical merits. A mismatch calls for evidence preservation and official or professional help—not payment through the message.
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