Global Tax Guide by tk.cpa AI Lab
Global Tax Guide / Africa / British Indian Ocean Territory
Africa

British Indian Ocean Territory

Corporate rate
Not applicable
Top personal rate
Not applicable
VAT / GST rate
Not applicable
One-sentence summary The British Indian Ocean Territory (BIOT) has no permanent civilian population and no independent civilian tax system - the territory consists of the Chagos Archipelago, home to the joint UK-US military facility on Diego Garcia, with all resident personnel being military or associated contractor staff rather than a genuine resident civilian tax base.

Tax System

BIOT has no permanent civilian population (the archipelago's former Chagossian inhabitants were controversially relocated in the late 1960s and early 1970s, a matter of ongoing international legal and political dispute); the only current residents are UK and US military personnel and associated contractors at the Diego Garcia facility, who remain subject to their home country's tax rules (UK or US) rather than any BIOT-specific civilian tax system, since none exists. This guide takes no position on the underlying sovereignty dispute over the Chagos Archipelago (including Mauritius's claim and a 2025 UK-Mauritius agreement addressing the territory's future status), which is a matter of international law and politics rather than tax administration.

Tax Year & Key Deadlines

Not applicable given the absence of a civilian tax system.

Corporate Tax Rate

No BIOT-specific corporate tax system exists; any commercial activity connected to the territory would be assessed under UK or US tax rules depending on the entity's own home jurisdiction, not a BIOT-specific tax code.

Personal Tax Rate

No BIOT-specific personal tax system exists; military and contractor personnel remain taxed under their home country's (UK or US) rules.

VAT / GST Rate

No VAT or GST system exists in BIOT.

Residency

BIOT has no civilian residency-based tax system; personnel present at the Diego Garcia facility remain tax residents of their home country (UK or US) under those countries' own rules.

Permanent Establishment

Not applicable given the absence of a BIOT-specific corporate tax system.

CFC (Controlled Foreign Company) Rules

Not applicable given the absence of any BIOT-specific tax system.

Thin Capitalization

Not applicable given the absence of any BIOT-specific tax system.

Hybrid Entity Rules

Not applicable given the absence of any BIOT-specific tax system.

Foreign Bank Account / Foreign Financial Asset Reporting

Not applicable given the absence of any BIOT-specific tax system.

Participation Exemption

Not applicable given the absence of any BIOT-specific tax system.

Foreign Tax Credit

Not applicable given the absence of any BIOT-specific domestic tax system.

Treaty Network

BIOT does not maintain its own double tax treaty network, consistent with having no independent civilian tax system; any relevant treaty position would be assessed under the UK's or the relevant home country's own treaty network instead.

Official tax authority: No independent civilian tax authority exists; the territory is administered by a UK Commissioner (BIOT Administration, part of the UK Foreign, Commonwealth and Development Office)
Sources: General knowledge of BIOT's unique status as a territory with no permanent civilian population, consisting primarily of the joint UK-US Diego Garcia military facility; this guide notes the ongoing Chagos Archipelago sovereignty question (including a 2025 UK-Mauritius agreement on the territory's future) without taking a position on the underlying dispute, which is separate from the tax-administration question addressed on this page. Page last verified: August 09, 2026. General information only - confirm current rates and any specific position with a licensed advisor in this jurisdiction before relying on this page.