Global Minimum Tax: What It Means for Offshore Structures

How the global minimum tax reshapes offshore structures, who falls in scope, and the planning moves that still work for international groups in 2026.

For two decades, a great deal of international structuring rested on a simple proposition: profit could be booked in a low-tax or no-tax jurisdiction, and the headline rate there was the rate that mattered. The global minimum tax has quietly retired that assumption for a defined class of large enterprises.

The change is not subtle in its intent. Under the OECD-led framework commonly known as Pillar Two, the largest multinational groups are now expected to pay an effective rate of at least 15 percent on profits in every jurisdiction where they operate. Where the local effective rate falls below that floor, a top-up tax is collected somewhere in the chain. The zero-tax jurisdiction does not disappear, but the benefit of routing profit through it can.

This article sets out, in plain terms, who is caught, how the mechanics work, what it means for offshore structures specifically, and where genuine planning still has room to operate as at 2026.

Who actually falls within scope

The first point to understand is that the global minimum tax is not a universal rule. It applies, broadly, to multinational enterprise groups with consolidated annual revenue at or above a high threshold, commonly cited as 750 million euros, in at least two of the four preceding years. That threshold is the same one used for country-by-country reporting, which is deliberate.

For the overwhelming majority of entrepreneurs, family offices, and privately held businesses we advise, this means the rules do not apply directly. A founder holding a trading company and an investment holding vehicle, or a family office running a few hundred million in assets through private structures, will typically sit well below the revenue floor. The regime is aimed at large corporate groups, not at private wealth.

That said, scope is tested at group level, and groups can grow into it. A fast-scaling technology business that crosses the revenue threshold, or a private group that consolidates several substantial operating companies, can find itself in scope without having changed its structure at all. The honest answer is that scope must be checked against consolidated figures each year, not assumed once and forgotten.

How the top-up mechanism works

The architecture is easier to grasp once you separate the rate from the collection. The framework calculates a jurisdictional effective tax rate by dividing covered taxes by a defined measure of profit for each country in which the group operates. If that rate is below 15 percent, the difference is the top-up.

The top-up is then collected through an ordered set of rules. A qualified domestic minimum top-up tax, where a jurisdiction has enacted one, allows the low-tax country itself to charge the shortfall first. If it does not, an income inclusion rule generally allows the parent jurisdiction to tax the shortfall. A backstop, the undertaxed profits rule, allows other jurisdictions in the group to pick up anything that escapes.

The practical consequence is important. If profit sits in a zero-tax offshore company that belongs to an in-scope group, the 15 percent will be collected regardless. The only open question is which government collects it. Many traditional offshore centres have responded by introducing their own domestic minimum top-up taxes, precisely so that the revenue stays local rather than flowing to a parent jurisdiction.

What this means for offshore structures

The blunt conclusion is that, for in-scope groups, an offshore company can no longer be relied upon to reduce the group effective rate below the floor. The structure may still be useful for other reasons, but the rate arbitrage that once justified it has narrowed considerably.

There are, however, important nuances. The rules include a substance-based income exclusion, which carves out a return calculated on tangible assets and payroll in a jurisdiction. The policy logic is deliberate: the framework targets profit that is mobile and lightly substantiated, not profit that reflects real people and real assets on the ground. A structure with genuine operations, staff, and premises in a jurisdiction therefore shelters part of its income from top-up, while a brass-plate arrangement shelters very little.

There are also transitional safe harbours, which can switch off detailed calculations for a jurisdiction that clearly poses no risk, typically tested using country-by-country reporting data. These reduce compliance burden in the early years but do not change the underlying direction of travel.

For groups outside scope, the message is different again. Offshore structures retain their established uses: asset protection, succession planning, neutral jurisdiction for joint ventures, regulatory positioning, and access to particular banking or fund ecosystems. None of those rationales depends on beating a 15 percent floor.

Where genuine planning still works

The most durable response to the minimum tax is not avoidance but alignment of substance with profit. Where a jurisdiction is chosen because real activity genuinely happens there, the substance-based exclusion does meaningful work and the structure is far more defensible against challenge.

For in-scope groups, planning has shifted toward managing the location of the top-up and the compliance footprint rather than eliminating tax. Choosing whether profit is taxed by a domestic top-up tax in the operating jurisdiction or pulled up under an income inclusion rule in the parent country is a real decision with cash-flow and administrative consequences. So is the timing of recognising deferred tax, and the careful preparation of country-by-country data that now drives safe-harbour eligibility.

For groups approaching the threshold, the key is foresight. A business that models its consolidated revenue trajectory can decide, in advance, how it wants to look on the day it crosses the line, rather than reacting after the first in-scope year has already closed.

There is also a wider strategic point. Because headline-rate competition has been blunted at the top end, jurisdictions increasingly compete on other dimensions: quality of regulation, treaty networks, fund and licensing regimes, talent, banking depth, and political stability. For internationally mobile founders and investors, those factors were always the better basis for a decision, and they matter more now than ever.

Common misunderstandings

Two errors recur in conversations. The first is the belief that the minimum tax has made offshore structures illegal or pointless. It has not. It has narrowed one specific benefit for one specific population, while leaving the legitimate non-tax rationales entirely intact.

The second is the opposite error, an assumption that a private structure is automatically out of scope and can be ignored. Scope follows consolidated group revenue, and growth can quietly bring a structure within the rules. The responsible approach is to test scope annually and document the conclusion, rather than to assume either outcome.

How HPT helps

We advise founders, family offices, and corporate groups on structures that are built to withstand the post-Pillar-Two environment rather than to ignore it. That means assessing whether your group is, or is becoming, in scope; aligning substance with where profit genuinely arises; modelling where any top-up tax would be collected; and ensuring the wider non-tax rationale for each entity is sound and documented. Where a group sits comfortably outside scope, we focus on the protection, succession, and access benefits that drove the structure in the first place.

If you would like a clear read on how the global minimum tax affects your specific structure, we would be glad to talk it through.