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Country guide

British Indian Ocean Territory

British Indian Ocean Territory has no native TIN system available for validation. BIOT law prevents income tax, corporation tax, capital gains tax, or substantially similar taxes, and official guidance records no permanent population on the islands.

IO IOT TIN guidance Last reviewed 2026-06-01
TIN status

No separate local TIN format is published for validation.

  • 1 Ordinarily, the only persons present are military personnel, BIOT Administration public officers, defence support staff, and occasional visiting scientists.
  • 2 Bodies corporate or equivalent entities treated as tax-resident elsewhere are not regarded as resident in BIOT.