The English term tax haven refers to what the French call paradis fiscal. Understanding this terminology and the mechanisms it encompasses has become a prerequisite for anyone interested in international taxation, especially since the effective implementation of the OECD framework on global minimum tax. The question today is no longer whether tax havens exist, but rather how much of their real advantage remains after recent reforms.
Global minimum tax of 15%: what Pillar Two changes concretely
The so-called Pillar Two framework of the OECD imposes a minimum effective tax rate of 15% on the profits of large multinationals whose consolidated revenue reaches at least 750 million euros in at least two of the previous four years. This threshold is not theoretical: most EU member states have been applying the IIR rule since 2024 and the UTPR rule since 2025.
The United Kingdom, Switzerland, Norway, Iceland, the United Arab Emirates, Singapore, and Hong Kong have also established equivalent mechanisms. Concretely, a jurisdiction with a 0% tax rate can no longer go below a 15% effective rate for the affected groups, as domestic or group-level “top-up taxes” fill the gap.
This is where the notion of tax haven in English takes on a new dimension: a classic tax haven loses some of its appeal for very large groups while remaining relevant for structures below the 750 million euro threshold.
Tax haven, offshore financial center, secrecy jurisdiction: the English terms and what they encompass
English literature distinguishes several concepts that French often groups under the single term “paradis fiscal.” These distinctions are not cosmetic: they reflect different fiscal and regulatory realities.
| English term | Common translation | Main characteristic |
|---|---|---|
| Tax haven | Paradis fiscal | Very low or zero tax rate on certain incomes |
| Offshore financial center (OFC) | Centre financier offshore | Disproportionate volume of financial transactions compared to the local economy |
| Secrecy jurisdiction | Juridiction de secret | Opacity of property records and information exchange |
A territory can combine these three characteristics, but not necessarily. The Cayman Islands primarily operate as an offshore financial center. Switzerland was long considered a secrecy jurisdiction before its automatic information exchange agreements.
In contrast, some OECD member states themselves facilitate aggressive tax optimization. The 2021 Corporate Tax Haven Index from the Tax Justice Network shows that OECD countries are responsible for more than two-thirds of corporate tax abuses worldwide. The rules set by this organization have not succeeded in detecting and preventing abuses facilitated by its own members.
QDMTT and DMTT: the responses of traditional tax havens to Pillar Two
Several jurisdictions historically regarded as tax havens are not merely accepting the reform. They are adapting their tax framework to capture the supplementary tax locally rather than allowing it to flow back to the country of the multinational’s headquarters.
- The United Arab Emirates and Singapore are implementing domestic minimum taxes (DMTT or QDMTT) that guarantee at least a 15% effective rate while retaining other advantages (absence of personal income tax, favorable bilateral agreements)
- Hong Kong, long known for having one of the lowest corporate tax rates among developed economies, is adjusting its rules to remain compliant while preserving its status as a regional financial center
- Some island jurisdictions retain a residual advantage for structures that do not reach the 750 million euro revenue threshold, a segment that remains outside the scope of Pillar Two
This adaptation illustrates a recurring mechanism: tax havens do not disappear under regulatory pressure; they mutate. The English vocabulary has even expanded with the term qualified domestic minimum top-up tax (QDMTT) to designate these local capture mechanisms.
Blacklists and tax treaties: the weight of words in international negotiations
The European Union maintains a list of non-cooperative jurisdictions in tax matters, regularly updated. The OECD publishes its own assessments through the Global Forum on Transparency and Exchange of Information for Tax Purposes.
These lists have direct consequences: a jurisdiction listed on the EU blacklist faces increased withholding taxes and restrictions on financial flows from member states. Moving from a blacklist to a grey list, or complete removal, often depends on the adoption of standards such as automatic information exchange (Common Reporting Standard, or CRS in English).
For businesses and individuals structuring their international taxation, English terminology is not a detail. Bilateral tax treaties use precise definitions of tax residency, permanent establishment, and beneficial owner. A misclassification can turn legal optimization into characterized tax evasion.
Optimization, evasion, fraud: three English terms not to confuse
Tax planning is lawful. Tax avoidance (evasion fiscale in the French sense, or aggressive optimization) lies in a grey area, legal but subject to reclassification. Tax evasion refers to tax fraud, which is subject to criminal penalties.
The proposals for a United Nations tax convention, put forward by economists and NGOs, aim precisely to clarify these boundaries and to transfer regulatory power to a framework broader than that of the OECD, whose members are both judges and parties in defining the rules.
The global minimum tax of 15% redraws the map of international tax advantages without eliminating the gaps between jurisdictions. For structures below the 750 million euro revenue threshold, traditional tax havens retain some of their appeal. Mastery of English vocabulary in international taxation remains a concrete tool for navigating between treaties, lists, and reporting obligations that govern these arrangements.
