Global Tax Reform & Pillar Two Tracker

The global minimum tax framework - commonly called Pillar Two - is the most significant restructuring of international corporate taxation in decades. At its core, Pillar Two requires large multinational enterprises to pay a minimum effective tax rate of 15% on profits in every jurisdiction where they operate. For groups with consolidated revenues above EUR 750 million, the rules are no longer theoretical: dozens of countries have enacted domestic legislation, and the compliance clock is running. This guide tracks the state of implementation across key jurisdictions, explains the core mechanics, and maps the practical obligations that finance and tax teams must manage now.

This tracker is structured as a living reference for in-house counsel, CFOs and international tax advisers. It covers the OECD/G20 Inclusive Framework';s two-pillar solution, with primary focus on Pillar Two - the Global Anti-Base Erosion (GloBE) rules. Pillar One, which addresses the reallocation of taxing rights for the largest and most profitable multinationals, is referenced where relevant but remains subject to ongoing negotiation and has not yet entered into force in most jurisdictions.

The tracker addresses:

• The GloBE model rules and their domestic transposition status across major economies.
• The Qualified Domestic Minimum Top-up Tax (QDMTT), which allows countries to collect top-up tax before another jurisdiction can.
• The Income Inclusion Rule (IIR) and the Undertaxed Profits Rule (UTPR), the two primary charging mechanisms under Pillar Two.
• Safe harbours and transitional reliefs that reduce compliance burden in the short term.
• Key filing and payment deadlines by region.

Understanding where each country sits in the implementation cycle is essential for any group that crosses the revenue threshold. A common mistake is assuming that because a group';s home country has not yet enacted GloBE legislation, no Pillar Two exposure exists. In practice, if a parent entity is located in a jurisdiction that has enacted the IIR, top-up tax may be collected there even if the subsidiary';s host country has not acted.

The GloBE rules operate by calculating an effective tax rate (ETR) for each jurisdiction where a multinational group has constituent entities. The ETR is computed by dividing adjusted covered taxes by GloBE income. If the ETR in a jurisdiction falls below 15%, a top-up tax is triggered to bring the combined rate to that floor.

The calculation is not straightforward. GloBE income excludes certain items - most notably dividends from portfolio shareholdings and gains on the disposal of shares - and covered taxes must be adjusted to remove deferred tax movements that do not reflect genuine economic activity. The Substance-Based Income Exclusion (SBIE) carves out a portion of payroll costs and tangible asset carrying values from the GloBE income base, providing some relief for groups with genuine physical operations in low-tax jurisdictions.

The QDMTT is the mechanism most countries have chosen to protect their own tax base. By enacting a domestic top-up tax that meets the OECD';s qualification criteria, a country ensures that any top-up tax due on profits earned within its borders is collected domestically rather than by the parent';s home jurisdiction. For groups, a QDMTT in a host country generally offsets the IIR charge that would otherwise arise at the parent level - but only if the QDMTT is genuinely "qualified," meaning it follows the GloBE rules closely enough to satisfy the OECD';s peer review process.

A non-obvious requirement is that the qualification status of a domestic minimum tax is not self-declared. The OECD';s Inclusive Framework conducts peer reviews, and a QDMTT that has not yet received a positive determination may not be treated as qualified for offset purposes. Groups should monitor the OECD';s published list of jurisdictions with qualified or provisionally qualified status rather than relying on domestic government announcements alone.

The pace of Pillar Two adoption has been uneven. The European Union mandated implementation through a Council Directive, and most EU member states have enacted domestic legislation. The United Kingdom enacted its own GloBE-aligned rules through the Finance (No. 2) Act and subsequent Finance Acts, covering both the IIR and a QDMTT. Switzerland, Japan, South Korea, Australia, Canada and several other OECD members have also enacted or are in the process of finalising domestic legislation.

The United States presents a distinct situation. The US has not enacted Pillar Two legislation. Instead, it relies on the Global Intangible Low-Taxed Income (GILTI) regime, which was introduced under the Tax Cuts and Jobs Act. The OECD has acknowledged that a strengthened GILTI regime could be treated as equivalent to the IIR for US-parented groups, but the conditions for that equivalence - including a per-jurisdiction calculation and a rate at or above 15% - have not been fully met under current US law. This creates a significant asymmetry: US-parented groups may face top-up tax charges in jurisdictions that have enacted the UTPR, while non-US groups with US subsidiaries must assess their GILTI exposure separately from their GloBE calculations.

In practice, two scenarios illustrate the divergence:

• A European-headquartered group with subsidiaries in a low-tax jurisdiction such as Ireland or Singapore will face IIR charges at the parent level unless those jurisdictions have enacted a qualified QDMTT that absorbs the top-up tax first. Both Ireland and Singapore have enacted QDMTTs, which in most cases resolves the IIR exposure at the parent level.
• A US-headquartered group with European subsidiaries may face UTPR charges in EU member states if the US parent';s overall ETR falls below 15% and the US has not enacted a qualifying IIR. Finance teams in these groups must model both GILTI and GloBE exposure simultaneously, as the two regimes interact but do not fully align.

Emerging markets and developing economies have been slower to adopt. Many members of the Inclusive Framework have signed on to the political agreement but have not yet enacted domestic legislation. For groups with significant operations in Africa, Southeast Asia or Latin America, the near-term Pillar Two exposure is more likely to arise at the parent level through the IIR than through a local QDMTT.

If your group is assessing its GloBE exposure across multiple jurisdictions, contact info@vlolawfirm.com. We can assist with mapping constituent entity positions and identifying where top-up tax risk is most acute.

The OECD introduced a package of transitional safe harbours to reduce the compliance burden in the early years of implementation. The most widely used is the Transitional Country-by-Country Reporting (CbCR) Safe Harbour, which allows groups to use existing CbCR data to demonstrate that a jurisdiction';s ETR is above 15% or that profits in that jurisdiction are below a de minimis threshold. If the safe harbour conditions are met, no detailed GloBE calculation is required for that jurisdiction in that year.

The CbCR safe harbour has three tests. A jurisdiction passes if it meets any one of the following:

• The de minimis test: GloBE revenue below EUR 10 million and GloBE income below EUR 1 million.
• The simplified ETR test: the ETR computed using simplified financial accounting data is at or above a transitional rate that steps up over the initial years of implementation.
• The routine profits test: GloBE income does not exceed the SBIE amount for that jurisdiction.

A common mistake is treating the CbCR safe harbour as permanent. It is explicitly transitional, and groups that rely on it heavily in the early years must build the capability to perform full GloBE calculations before the safe harbour expires. Many underestimate the data infrastructure required to move from CbCR-based reporting to a full jurisdiction-by-jurisdiction GloBE computation, particularly for groups with complex holding structures or significant deferred tax positions.

The Permanent Safe Harbour for QDMTTs provides a more durable relief. Where a jurisdiction has a qualified QDMTT, a constituent entity in that jurisdiction is treated as having a GloBE ETR of exactly 15% for IIR and UTPR purposes, eliminating the need for a separate GloBE calculation at the parent level. This safe harbour is not transitional and is expected to remain in place indefinitely, making the qualification status of host-country QDMTTs a critical planning variable.

The GloBE rules introduce a new filing obligation: the GloBE Information Return (GIR). The GIR is a standardised report that groups must file with the tax authority in each jurisdiction where they have constituent entities. It sets out the GloBE income, covered taxes and ETR for every jurisdiction in which the group operates, along with the top-up tax calculation where applicable.

Filing deadlines vary by jurisdiction but are generally set at 15 months after the end of the fiscal year for the first year of application, stepping down to 18 months in subsequent years under certain transitional provisions. Some jurisdictions have adopted shorter domestic deadlines. Groups should not assume that the OECD';s model timeline applies uniformly - each country';s domestic legislation sets its own deadline, and penalties for late filing can be material.

The GIR can be filed by a single designated filing entity on behalf of the group, which in most cases will be the ultimate parent entity or a surrogate parent entity in a jurisdiction that has enacted the relevant rules. This centralised filing model reduces duplication but requires a high degree of coordination between the group';s central tax function and local finance teams.

Penalties for non-compliance differ significantly across jurisdictions. Some countries impose fixed penalties per day of late filing; others apply percentage-based penalties on the top-up tax due. A non-obvious risk is that penalties may arise even where no top-up tax is ultimately payable - for example, where a group fails to file the GIR on time in a jurisdiction where the safe harbour would have applied had the filing been made.

Beyond the GIR, groups must also consider the interaction of Pillar Two with existing transfer pricing documentation requirements. The GloBE rules do not replace transfer pricing - they operate in parallel. A transfer pricing adjustment that increases taxable income in a low-tax jurisdiction may simultaneously reduce the top-up tax due under Pillar Two, but the two calculations must be performed separately and reconciled.

For groups managing compliance across multiple jurisdictions, the practical challenge is less about understanding the rules in the abstract and more about building the data flows and governance structures to apply them consistently. Several recurring issues arise in practice.

Deferred tax accounting under GloBE differs from IFRS or US GAAP deferred tax. The GloBE rules use a concept of "GloBE deferred tax assets and liabilities" that must be tracked separately from the group';s financial reporting deferred tax positions. Groups that have not established a parallel tracking system will find it difficult to compute covered taxes accurately, particularly in jurisdictions with significant timing differences between accounting and tax.

Equity method investments and joint ventures present particular complexity. The GloBE rules generally exclude income from equity method investments from GloBE income, but the treatment of the underlying entity depends on whether it is itself a constituent entity of the group. Groups with significant minority interests or joint venture structures should map these carefully before assuming they fall outside the GloBE perimeter.

Currency translation is another area where the rules diverge from standard accounting practice. The GloBE rules require translation of covered taxes and GloBE income into the group';s reporting currency using specific exchange rate conventions that may differ from those used in the consolidated financial statements. Small differences in exchange rates can affect whether a jurisdiction';s ETR falls above or below the 15% threshold.

A second practical scenario: a manufacturing group with a treasury function in a low-tax jurisdiction and production facilities in higher-tax countries may find that the SBIE provides meaningful relief for the production entities but does little to address the ETR shortfall in the treasury jurisdiction. In this case, the group may need to consider whether restructuring the treasury function - or accepting the top-up tax charge - is the more efficient outcome. The answer depends on the quantum of the top-up tax, the cost of restructuring, and the availability of any applicable safe harbour.

For groups that need to assess their GloBE position across multiple jurisdictions and entity types, contact info@vlolawfirm.com. We can help structure the compliance framework and identify planning opportunities within the rules.

Does Pillar Two apply to all multinational groups above EUR 750 million in revenue?

The EUR 750 million consolidated revenue threshold is the primary scope test, but it is not the only one. The threshold is measured over a rolling period - typically two of the four preceding fiscal years must exceed the threshold before the rules apply. Some jurisdictions have enacted domestic minimum taxes that apply to smaller groups, so a group below the GloBE threshold may still face a domestic top-up tax in certain countries. Groups should also be aware that the threshold applies to the ultimate parent';s consolidated group, not to individual subsidiaries, meaning a relatively small local entity can be within scope if its parent group exceeds the threshold globally.

How long does it take to build a GloBE compliance process, and what does it cost?

The timeline depends heavily on the group';s existing data infrastructure. Groups that already produce high-quality CbCR reports and have robust entity-level financial data can typically build a GloBE calculation model within several months. Groups with fragmented ERP systems, complex holding structures or significant deferred tax positions may require a year or more to reach a reliable compliance state. Professional fees for a full GloBE readiness assessment and model build typically run from the mid-five figures to the low-six figures in EUR or equivalent, depending on group complexity. Ongoing compliance costs - including GIR preparation and filing - are generally lower but should be budgeted as a recurring annual expense.

Can a group restructure to reduce its Pillar Two exposure?

Restructuring to reduce GloBE top-up tax is possible in principle but is subject to significant constraints. The OECD';s Subject to Tax Rule and the UTPR are designed to limit the effectiveness of purely tax-driven restructurings. Substance-based restructurings - for example, relocating genuine economic activity to a jurisdiction with a QDMTT - can reduce exposure, but the SBIE carve-out is calibrated to reward genuine substance rather than nominal presence. Groups should also be aware that restructuring may trigger other tax costs, including transfer pricing adjustments, exit taxes or stamp duties, that offset the GloBE saving. Any restructuring analysis should model the full tax cost across all affected jurisdictions, not just the GloBE impact in isolation.

Pillar Two is now operational in a significant number of jurisdictions, and the compliance obligations it creates are real, recurring and material for groups above the revenue threshold. The rules are complex, the data requirements are substantial, and the interaction with existing regimes - including GILTI, transfer pricing and domestic minimum taxes - demands careful coordination. Groups that have not yet completed a GloBE readiness assessment should treat that as a priority.

VLO Law Firms advises international clients on Tax Reform and Pillar Two matters across global jurisdictions. We can assist with GloBE scoping assessments, constituent entity mapping, GIR filing coordination, safe harbour analysis, and structuring reviews. To request a consultation, contact: info@vlolawfirm.com