DIN in GST: Definition, Structure, Importance, and Process!

The Document Identification Number (DIN) has emerged as a cornerstone for ensuring compliance and seamless communication in the GST framework. In 2019, CBIC rolled out DIN in GST to ensure every tax notice or communication has a unique identity code. This indicates authenticity and is easy to verify the tax notices.

The CBIC, through Circular 249/06/2025 dated June 9, 2025, introduced important modifications to DIN procedures. The circular also states that tax officials shouldn’t quote DIN on documents like summons, arrest warrants, investigation notice, enquiry letters, and search authorization. This latest update signifies a complete change from the earlier circulars issued in November and December 2019. 

The blog will take you through DIN full form in GST, definition, structure, importance, and everything you need to know. Let’s quickly move ahead to see what is the meaning of DIN in GST. 

What is DIN in GST? 

DIN full form in GST is Document Identification Number. It is basically a 20-digit computer-generated alphanumeric identification code printed on communications sent by tax officials.

This document identification number is a way to validate the authenticity of the notices or memos issued by the Central Board of Taxes and Customs (CBIC) and identify if it is genuine. DIN in GST is generated only through the official GST portal by authorized officials, ensuring the communication isn’t tampered with.

Now, as we have understood what is DIN in GST, let’s see its structure! 

Structure of DIN Number in GST: A Quick Snapshot! 

Here’s how the structure of DIN in GST is designed:

CBIC-YYYY MM ZCDR NNNN

Where: 

1. YYYY → Indicates the year of DIN generation under GST.
2. MM → Denotes the month during which the DIN is issued
3. ZCDR → Zone / Commissionerate code. 
4. NNNN → Computer-generated random alphanumeric code. 

Read More: ARN Number in GST

What is the Importance of DIN in GST? 

1. The document identification number on all the official tax communications integrates transparency in the system, eliminating fake notices and making it easier to identify the genuine ones.
2. It maintains the proper audit trail for every communication sent by the tax officials.
3. The presence of Document Identification Number in GST strengthens taxpayer protection.

Checking and Validating DIN in GST Through the CBIC Portal

1. Navigate to CBIC website- https://www.cbic.gov.in/ 
2. Click on ‘Verify CBIC-DIN’ option seen on the home page. 
3. Now, insert the DIN number in GST. 
4. Choose ‘communication category’, ‘Communication sub category’, and ‘Stream’ from the dropdown menu. 
5. Enter the CAPTCHA given in the image. 
6. Proceed ahead by clicking Submit. 

Please note: Your communication details will be displayed on the screen only if the DIN is correct or valid. 

DIN in Action: How to Validate IT Notices Easily

1. Head over to the e-filing portal and navigate to the authenticate notice/order issued by ITD on the left bar. 

2. Now, authenticate Income Tax Notice through either of the two given below: 

• Provide PAN, document category, assessment year, issuance date, and phone number.   
• Document Identification Number and registered contact number. This refers to notices for all the assessment years.

3. To check or authenticate IT notice using Document Identification number, you need to choose the option 2 radio button and click continue. 

4. Now, DIN and mobile number. Click continue to proceed.

5. A valid notice will be displayed instantly on the portal. 

6. If there’s no such notice, then the below screen will appear.

What are the Features of DIN in GST? 

1. Unique Identity: The document identification number in GST integrates uniqueness to the IT notices, orders, and memos issued by officials.
2. Easy Document Identification: The DIN number in GST is clearly visible on all the official communication documents issued by the IT department, allowing them to be easily identified.
3. GST DIN Verification: Taxpayers can eliminate falling prey to fake notices by verifying the document’s authenticity through the Document Identification number stated in the communication.
4. Digital Relevance: DIN code in GST is the best way to trace and manage documents online for digital communication, e-verification, etc.
5. Prevents Frauds: DIN in GST helps to minimize fraud or fake notices, as every communication from the IT department includes a valid document identification number. 

Documents Covered Under DIN Requirement in GST 

For the documents listed below, a Document Identification Number is generated on the portal. 

•  Search Warrants or Seizures 
• Summons 
• Arrest Memos 
• Inspection Notice 
• Investigation Letter 

Conclusion

DIN in GST isn’t just about a code structure, it is more than that. It is the foundation of transparency, accountability, and reliability in the tax ecosystem. It protects the taxpayers from fake notices and makes every official communication authentic. 

So,  next time you get an official notice, check the DIN on it and verify its authenticity through the process given in the blog. Bookmark the blog to stay protected. 

FAQs of DIN in GST

1. How to Find DIN in GST? 

All official communications from the IT department include the Document Identification number for verification.

2. What is DIN full form in GST? 

Document Identification number is the DIN full form in GST. 

3. Is it mandatory to authenticate documents using DIN in GST? 

To avoid falling prey to fraudulent tax notices, it becomes crucial to authenticate every communication you receive from the IT department. 

4. Who should have a DIN? 

Income tax officials who issue the communications to the taxpayers are required to quote the document identification number on the letters. 

5. What to do if the issued communication doesn’t display a DIN?

• If the document doesn’t carry a DIN in GST, the document stays invalid. 
• In cases where a DIN is not provided on a notice, the issuing official must explain why. 

6. Why is it important for a Taxpayer to understand what is DIN in GST?

In the digital era with new hacking practices on rise, the taxpayers are likely to receive an increasing number of fake notices. To stay ahead of fraudulent attempts, taxpayers need to keep a check on DIN in GST.