Tax in British Indian Ocean Territory
Last reviewed: · by TaxProsRated editorial
TL;DR
British Indian Ocean Territory is a UK Overseas Territory with no permanent civilian population (Diego Garcia hosts UK and US military personnel). No general tax framework. UK-Mauritius sovereignty agreement (2024) progressively transitioning some governance arrangements.
Tax authority
UK administration; no domestic tax framework due to absence of permanent civilian population [SC1].
Filing framework
Not applicable for residents (military personnel file in home countries).
Residency
No civilian residents. Military personnel home-country rules.
Personal income tax
Not applicable.
Corporate tax
Not applicable.
Indirect tax
Not applicable.
Cryptoassets
Not applicable.
Treaties
Not applicable. UK-Mauritius sovereignty agreement (2024) transitioning some governance arrangements.
Frequently asked
What is the BIOT tax framework?
UK Overseas Territory with no permanent civilian population. Diego Garcia hosts UK/US military personnel who file in home countries. No domestic tax framework. UK-Mauritius sovereignty agreement (2024) progressively transitioning some governance arrangements.
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The figures, dates, and rules on this page are sourced from the documents listed below. Where two sources disagree, both are listed.
- UK Foreign, Commonwealth and Development Office · accessed
Important disclaimer
Informational only — not tax advice. This page summarises publicly available information about tax in British Indian Ocean Territory as of May 2026. Tax laws change, individual circumstances vary, and the application of any rule depends on your specific facts.
TaxProsRated does not provide tax, legal, accounting, or financial advice. Before acting on anything you read here, consult a qualified tax professional licensed in your jurisdiction (in the US: CPA, Enrolled Agent, or attorney; in the UK: CIOT- or ATT-qualified adviser; in Australia: TPB-registered tax agent; elsewhere: a locally-licensed equivalent). TaxProsRated, its operators, and its contributors disclaim all liability for action taken in reliance on this page.