PAN/Aadhaar quoting requirement for high-value cash transactions and account openings mandates quoting and authentication of tax identifier. Persons must quote PAN or Aadhaar when making specified high-value cash deposits or withdrawals in a financial year or when opening a current or cash credit account with specified banks or the post office; the receiving bank or post office must ensure the identifier is quoted and authenticated, with limited exemptions for certain non-residents, foreign companies and transactions involving IFSC banking units where no income is chargeable to tax in India.