The Central Board of Direct Taxes (CBDT) has strengthened compliance norms by updating the rules for quoting the Document Identification Number (DIN) in all income-tax communications.

What is DIN and Why It Matters

DIN is a unique number generated for every communication issued by the Income-tax Department. It ensures transparency, traceability, and authenticity of notices, orders, and correspondence.

Key Updates Under Circular 4/2026

• Mandatory DIN: All communications, including notices, orders, letters, emails, and attachments, must carry a valid DIN.

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• Digital Coverage Expanded: Even electronic communications must clearly mention DIN.

• Invalid Without DIN: Any communication issued without DIN may be treated as invalid.

Exceptions to DIN Requirement

CBDT has allowed limited exceptions in specific situations:

• Technical system issues

• Delay in PAN availability

• Other exceptional circumstances as notified

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In such cases, authorities must record reasons and regularize the communication later as per prescribed procedures.

Exclusions

• Public communications such as press releases or general notices are not required to carry DIN.

Legal Backing and References

• CBDT Circular No. 4/2026

• CBDT Circular No. 19/2019 (initial DIN framework)

• Section 282 of the Income-tax Act, 1961 (mode of service of notice)

Conclusion

Taxpayers should verify the presence of DIN in all communications received from the Income-tax Department to avoid disputes and ensure authenticity.

For expert guidance on this topic, contact your tax professional today.