Issued 31 March 2026 under s.119 & s.116 ITA 1961 / s.522 ITA 2025: Every communication by an income-tax authority to any person (not being another officer or authority under the ITA or any other law) must be referenced by a computer-generated Document Identification Number (DIN). This applies to notices, letters, orders, draft orders, summons, etc. Supersedes Circular No. 19/2019 dated 14 August 2019 with immediate effect.
Flexibility in DIN placement: Referencing by DIN also includes attaching a separate document mentioning DIN with the communication, or mentioning DIN in the email correspondence. Critically — where a communication is referenced by DIN in any manner, it is not required that every page of the communication also carry DIN. Once per communication is sufficient.
Exceptions (para 3): DIN may be absent where: (a) technical or system issues prevent generation; (b) DIN functionality is unavailable in the system; (c) the assessees PAN is unavailable; or (d) migration issues exist. In all such cases, the communication must state the reason it is issued without DIN. Post-facto approval is required from the competent authority within 15 days of issuance — the competent authority is the Jt. Commissioner/Joint Director or above for CIT-level communications, and the CCIT/DGIT for others.
Upload obligation: Communications issued without DIN under the exceptions above must be uploaded onto the system with appropriate DIN referencing within 15 working days of issuance.
Practice implication: Any income-tax notice, order, or summons received by a client that does not carry a DIN (and does not explain the absence) is invalid and should be challenged. Under Circular 19/2019 (now superseded), courts have consistently held that non-DIN communications are void. Circular 4/2026 reinforces this position under both ITA 1961 and ITA 2025. At the point of receiving any notice, verify DIN presence before advising on response.