Document Identification Number
Also called DIN
A unique computer-generated number on every genuine communication from the Income Tax Department, used to check that a notice is real.
A Document Identification Number (DIN) is the unique number the Income Tax Department puts on every genuine notice, order or letter issued since 1 October 2019. You can check it on the e-filing portal without logging in, which helps you spot fake notices sent as phishing. Read more in what to do when you get an income tax notice.
Questions people ask
What is the full form of DIN in income tax?
Document Identification Number. The Income Tax Department says every communication it issues on or after 1 October 2019 should carry a unique DIN.
How do I check a DIN on an income tax notice?
On incometax.gov.in, use the 'Authenticate notice/order issued by ITD' service. It works without logging in. Enter the DIN, or your PAN with the notice details, and confirm with a one-time password sent to your mobile.
What if an income tax notice has no DIN?
The department's FAQ says a communication without a DIN would be treated as invalid, and you need not respond to it. Treat it as a possible fake and never pay through a link in it.
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