CBDT Mandates Use of Computer-Generated DIN on Income Tax Communications; Effective April 2026:

CBDT Mandates Use of Computer-Generated DIN on Income Tax Communications; Effective April 2026 The Central Board of Direct Taxes (CBDT) under the Ministry of Finance (Department of Revenue) has issued a Circular No. 4/2026, dated March 31, 2026, announcing updates in the rules related to the use of the Document Identification Number (DIN) in income-tax communications. This circular is a replacement for an earlier Circular No. 19/2019, dated August 14, 2019. As per the updated rules in the present circular, from now on, all official communications, such as notices, letters, and summons issued by the income tax authorities to the taxpayers, are mandatory to include a computer-generated DIN (Document Identification Number). This direction can be followed by mentioning the DIN directly in the document, attaching it separately, or including it in email correspondence.

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The CBDT has clarified that it is not obligatory to mention the DIN on every page of the document. Public communications, such as guidelines or FAQs (Frequently Asked Questions), are exempt from this requirement, meaning they are not required to be referenced by a DIN in any manner. In certain exceptional situations, like cases involving technical issues, lack of access to electronic systems, delays in PAN migration, absence of PAN details, or when system functionality is unavailable, etc., communications may be issued without a DIN. However, in such cases, communications must explicitly mention the reason why DIN has not been included.

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All communications issued without a DIN must receive approval from a higher authority within 15 days. The approving authority depends on the rank of the issuing officer. Additionally, in some cases, these communications must later be uploaded to the system with a valid DIN within 15 working days. The CBDT has issued the aforementioned directions in pursuance of its powers granted under Section 119 of the Income-tax Act, 1961 and in view of Section 292B and the amendments made in the Income-tax Act, 1961 (insertion of Section 292BA) and also in the Income-tax Act, 2025 [Section 522] by the Finance Act, 2026. Refer to the official circular for complete information.