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1. Why do I need to authenticate notice/order issued to me by Income Tax Authorities?
Every communication by Income Tax department issued on or after 1st October, 2019 shall bear an unique Document Identification Number(DIN). In order to satisfy yourself that the notice/order or any communication received by you is genuine and issued by Income Tax Authority, you can authenticate any notice/order or any communication using this service.

2. What if the ITD notice/order does not bear a DIN?
In such case, the notice/order/letter received by you would be treated as invalid and shall be non est in law or deemed to be as if it has never been issued. You do not need to take any action or respond to such communication.

3. Where can I authenticate the order issued to me by ITD?
You can authenticate the order issued by the Income Tax authorities on the e-Filing portal using Authenticate Notice / Order Issued by ITD service.

4. Do I need to log in to authenticate the notice issued to me by ITD?
No, you do not need to log in to the e-Filing portal to authenticate the notice / order. You can authenticate the notice by clicking on the Authenticate Notice/Order Issued by ITD link available on the e-Filing portal.

5. Do I need to enter the same mobile number as registered on the e-Filing portal to authenticate my notice?
No, it is not mandatory to enter the mobile number registered on the e-filing portal to authenticate the notice / letter or any communication issued by Income Tax Department. You may choose to receive OTP on any mobile number which is accessible to you by entering it in the mobile number textbox.

6. What is DIN?
DIN stands for Documentation Identification Number. It is a computer generated 20 digit unique number which needs to be duly quoted on every communication (letter / notice / order / any other correspondence) issued by any Income Tax Authority to any taxpayer.