Turkey announced this month a new fiscal regime exempting foreign-source income from Turkish tax for qualifying inbound residents. The mechanics, the political context, and the implications for the European inbound tax competition.

March 21, 2026 — The military conflict that erupted on February 28, 2026 — when United States and Israeli forces launched coordinated airstrikes on Iran, triggering retaliatory missile and drone strikes across the Gulf — has created the most severe disruption to life in the Arabian Peninsula in modern history.

After twelve months of OECD Pillar Two implementation, multinational tax functions are quietly rebuilding holding company architecture around a calculation that did not exist eighteen months ago. A field report on what changed, what did not, and where the new architecture is settling.

The 183-day rule survives in popular imagination but has been quietly demoted in the tax codes of every major European jurisdiction. France, the United Kingdom, Italy, and Spain now apply multi-factor residency tests in which day-counting is one input among many. A side-by-side reading.

The location of intangible assets within multinational groups was the central transfer pricing question of the 2010s. The implementation of Pillar Two and the partial advance of Pillar One have changed the calculus. Where intangibles ended up, and why.

The seventh amendment to the European Directive on Administrative Cooperation began producing data on January 31, 2024. Two reporting cycles later, the implications for cross-border platform workers, casual sellers, and the platforms themselves are clearer. A field reading.

The tie-breaker provisions of bilateral tax treaties were, for most of the post-1963 history of the OECD Model, a stable architecture. The post-2017 wave of treaty renegotiations has begun to rewrite them. A reading of where Article 4 is going.

Substance is the word that has done the most analytic work in international tax for the past decade. What it actually means in audit varies by jurisdiction. A side-by-side reading of the 2025 audit practice of the French DGFiP, the British HMRC, the Italian Agenzia delle Entrate, and the German Bundeszentralamt für Steuern.

The Common Reporting Standard has produced a decade of automatic information exchange between participating jurisdictions. The mechanics, the data flows, and the audit consequences are now visible in detail. A reading from the inside.

The single-family office sector has been migrating from its historical European and Asian centres toward the Gulf for the past five years. The structural drivers are clear; the legal architecture is more nuanced. A reading of the current state of the migration and where it is going.

Exit tax provisions vary widely across the OECD in their scope, mechanics, rates, and deferral options. A comparative reading of the regimes in France, Germany, the Netherlands, Spain, the United Kingdom, and the United States.

The Principal Purpose Test was the OECD's headline mechanism for ending treaty shopping. Five years into its widespread application, the practice is producing a body of case law and administrative interpretation that is reshaping cross-border structuring. A reading of the cases.

The largest multinational corporations move tens of thousands of employees across borders annually. The compliance, payroll, and tax architecture that supports this movement is sophisticated, expensive, and largely invisible. A reading from inside the function.

The bilateral investment treaty network was, for most of its history, a concern of states and large multinational corporations. The post-2015 wave of investor-state disputes has elevated it to a planning consideration for cross-border entrepreneurs and high-net-worth individuals. A reading of the new architecture.

The doctrine of permanent establishment was constructed in a world where employees worked at offices and equipment had locations. The pandemic-driven normalisation of remote work has produced fact patterns the doctrine did not contemplate. A reading of how the OECD and national authorities are responding.

The CFC regimes of the major OECD jurisdictions share a common origin in the United States Subpart F of 1962 but have diverged substantially in scope, mechanics, and enforcement. A side-by-side reading of the US, German, French, UK, and Italian regimes.

Beneficial ownership registers have moved from regulatory aspiration to operational reality across the OECD over the past decade. The implementation has been uneven; the consequences for cross-border holding structures have been substantial. A reading.

The OECD's framework for VAT collection on cross-border digital services, implemented progressively across Europe and adopted by other jurisdictions, has changed how digital businesses operate internationally. A reading of the framework and its operational realities.

Trust structures occupied a particular position in the historical architecture of cross-border wealth: legitimate, ancient, and substantially opaque. The post-CRS evolution of reporting frameworks has changed the third element. A reading of where trust transparency now stands.

The Multilateral Instrument was the OECD's mechanism for amending the bilateral tax treaty network at scale. Five years into operation, the patterns of adoption and the practical effects on cross-border investment are now visible. A reading.

The European Commission's investigation of national tax rulings as potential state aid has produced a body of decisions that have reshaped multinational structuring across Europe. A reading of the framework and its continuing trajectory.

Withholding tax planning was, for forty years, a central activity of cross-border tax structuring. The post-MLI principal purpose test has reshaped the field. A reading of where withholding tax planning now stands.

The EU Anti-Tax Avoidance Directive's anti-hybrid provisions have been in force since 2020. The operational reality of the rules has been more complex than their drafters anticipated. A reading of the framework as it operates in 2025.

The Limitation on Benefits provision originated in US bilateral treaty practice as the principal anti-treaty-shopping mechanism. The OECD's adoption of comparable provisions has spread the framework globally. A reading of how LOB now operates.

The place of effective management test was, for sixty years, the principal mechanism for resolving corporate dual residence under bilateral tax treaties. The 2017 OECD model shift has changed its position. A reading of where the doctrine now stands.

Inheritance and estate taxation operates differently across major jurisdictions and produces consequences that catch cross-border families unprepared. A comparative reading of the regimes that matter most.

Italy introduced its forfeit tax regime in 2017 as a tool for attracting high-net-worth inbound migration. Five years of operation have produced lessons. A reading of where the regime stands and what its longer-term trajectory looks like.

The Portuguese Non-Habitual Resident regime was, for fifteen years, the most widely used inbound tax incentive in Europe. The 2024 modifications have changed the position. A reading of where Portuguese inbound taxation now stands.

The United Kingdom abolished the historical non-domiciled tax regime in April 2025 after more than two centuries of operation. The reform's practical implications for cross-border wealth are substantial. A reading.