Permanent Account Number requirement increases withholding tax rate when not furnished, affecting deductees and deductors.

A statutory obligation requires a Permanent Account Number from any person entitled to income on which tax is deductible; failure to furnish it triggers deduction at the higher of the relevant statutory rate, the rates in force, or a fixed twenty percent rate. Declarations affecting withholding are invalid without the Permanent Account Number and, if rendered invalid, the deductor must apply the higher deduction rule. Certificates altering withholding require the applicant's Permanent Account Number, and invalid or mismatched numbers are treated as non-furnished, invoking the higher deduction rule.

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