The 2026 circular retains DIN as mandatory for most tax communications but allows greater flexibility in how it is referenced, including via email or attachments without requiring it on every page.

In a significant compliance update, the Central Board of Direct Taxes (CBDT) has introduced a revised framework for Document Identification Number (DIN) through Circular No. 4/2026, effective March 31, 2026. The move replaces the earlier 2019 circular and aims to streamline tax communication while reducing litigation and procedural bottlenecks.....

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