Unique Identification Number rules for Form 121 declarations and quarterly reporting by the payer take effect from 1 April 2026.

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....Payers using Form No. 121 must enable declarations in paper or electronic form, verify them electronically where applicable, and allot a 26-character Unique Identification Number to each declaration received. The UIN is composed of a running sequence number beginning with "D", the relevant tax year, and the payer's TAN; paper declarations must be digitised and placed in the same sequence, which resets for each TAN at the start of every tax year. The payer must furnish Part B of Form No. 121, with the declaration details and UIN, within the prescribed timelines on the income-tax e-filing portal, and also include the particulars in the quarterly tax deduction statement even where no tax was deducted.....