CBDT Introduces Mandatory UIN System to Track No-TDS Declarations Under Form 121
The CBDT issued Notification No. 01/2026 prescribing procedures, formats, and standards for generation and allotment of Unique Identification Numbers (UIN) for declarations in Form No. 121 under Section 393(6) of the Income-tax Act, 2025. The notification mandates that payers assign a 26-character UIN to each declaration received from payees seeking non-deduction of tax, comprising a sequence number, tax year, and payer’s TAN.