Tax residency documentation requirement: submission of specified identity and residency details for treaty relief eligibility. Form No. 10F prescribes information to be furnished under sub-section (5) of section 90 or section 90A of the Income-tax Act, 1961, including the assessee's status, allotted Permanent Account Number or Aadhaar, nationality or country of incorporation, tax identification number or equivalent government identifier, period covered by the residence certificate, and the foreign address for that period; the form must be signed, dated and verified and allows 'N.A.' where particulars form part of the certificate referred to in sub-section (4).