South Africa Enters the GloBE Era: A Practitioner’s Guide to the New Global Minimum Tax Regime

By Dr Hendri Herbst

Introduction: A Paradigm Shift in International Taxation

The international tax landscape is undergoing its most fundamental recalibration in over a century. The framework developed by the Organisation for Economic Co-operation and Development (OECD)/G20 Inclusive Framework on Base Erosion and Profit Shifting (BEPS), commonly known as Pillar Two, represents a coordinated global effort to curtail the “race to the bottom” on corporate income tax rates and ensure that large Multinational Enterprise (MNE) Groups contribute a fair share of tax in the jurisdictions where they operate. This initiative effectively establishes a new floor for tax competition by introducing a global minimum effective tax rate (ETR) of 15% for MNEs with annual consolidated revenues exceeding €750 million (in at least two out of its last 4 fiscal years).

Positioning itself as a proactive participant in this new global standard, South Africa has moved with remarkable speed to translate the OECD’s model rules into domestic law. This has been achieved through a dual legislative package (refer to our comments further below in this regard).

This article provides a technical analysis of South Africa’s new global minimum tax regime. It dissects the core mechanics of the underlying OECD framework, examines the specific policy choices embedded within the South African legislation, details the new and extensive administrative requirements, and offers strategic insights for tax practitioners and their clients navigating this new era of international taxation.

The Global Architecture: Core Tenets of the GloBE Framework

To fully appreciate the nuances of the South African legislation, it is essential to first understand the global architecture upon which it is built. The Global Anti-Base Erosion (GloBE) rules form the technical heart of Pillar Two, establishing a prescriptive and interlocking system to enforce the 15% minimum tax.

The 15% Minimum ETR and Jurisdictional Blending

The central objective of the GloBE rules is to ensure that an MNE Group’s profits in each jurisdiction are taxed at an ETR of at least 15%. A pivotal design feature is the principle of jurisdictional blending. The OECD considered but rejected a global blending approach, which would have allowed MNEs to average their high-tax and low-tax profits across the world, significantly weakening the rules. Instead, the framework requires the ETR to be calculated on a country-by-country basis. Under this model, the GloBE income and covered taxes of all constituent entities located within a single jurisdiction are aggregated to compute a single ETR for that jurisdiction. This means that while profits in a high-tax jurisdiction cannot be used to shelter profits in a low-tax one, blending is still permitted within a single jurisdiction. For instance, a subsidiary with an ETR of 25% can offset another subsidiary in the same country with an ETR of 5%, potentially resulting in a combined jurisdictional ETR above 15% and eliminating any Top-up Tax liability for that country.

The Interlocking Rule Order: A Strategic “Waterfall”

The GloBE rules are enforced through a set of three interlocking charging mechanisms that operate in a specific order of priority, often referred to as a “waterfall,” to determine which jurisdiction has the primary right to collect any Top-up Tax.

1. Qualified Domestic Minimum Top-up Tax (QDMTT): A QDMTT is a domestic minimum tax that a jurisdiction can implement, calculated in a manner consistent with the GloBE rules. Its critical feature is that it has first priority over all other rules. If a jurisdiction implements a QDMTT that meets the OECD’s qualification standards, it gets the first right to collect any Top-up Tax arising from the low-taxed profits of MNE operations within its borders. The amount paid under a QDMTT is then credited against the GloBE tax liability, potentially reducing any Top-up Tax due under the other rules to zero for that jurisdiction. This creates a powerful incentive for all countries to adopt a QDMTT; without one, the Top-up Tax revenue would be collected by a foreign parent jurisdiction, effectively allowing the source country’s tax incentives to subsidize a foreign treasury. A QDMTT is therefore a critical defensive measure to protect a country’s tax base.
2. Income Inclusion Rule (IIR): The IIR is the primary GloBE charging provision and operates on a “top-down” basis from the parent entity’s jurisdiction. Under a qualified IIR, a parent entity (typically the Ultimate Parent Entity, or UPE) is required to pay a Top-up Tax in its home jurisdiction based on its allocable share of the low-taxed income of its foreign subsidiaries. If the UPE’s jurisdiction has not implemented a qualified IIR, the obligation shifts down the ownership chain to the next Intermediate Parent Entity that is in a jurisdiction that has.
3. Undertaxed Profits Rule (UTPR): The UTPR serves as a secondary or “backstop” mechanism to the IIR, applying only when the full amount of Top-up Tax has not been collected under a QDMTT or an IIR. This could occur, for example, if the UPE is located in a jurisdiction that has not implemented a qualified IIR. Unlike the IIR, the UTPR operates from the “bottom-up,” allowing any jurisdiction that has implemented a UTPR to collect a portion of the residual Top-up Tax, typically by denying a tax deduction to a local group entity. Due to its mechanism of taxing profits that arise entirely outside its borders, the UTPR is considered the most controversial and extraterritorial element of the framework.

South Africa’s Legislative Response: Dissecting the GMTA and GMTAA

South Africa has formally implemented the Pillar Two framework through a dual legislative package: the GMTA, which provides for the imposition of the tax, and the GMTAA, which outlines the administrative procedures.

A Dual-Act Structure and the “Dynamic Reference” Approach

A defining feature of South Africa’s legislative strategy is its adoption of a “dynamic reference” or “ambulatory” approach to incorporating the OECD framework into domestic law. Rather than transposing the hundreds of pages of technical GloBE rules into the text of the South African Acts, the GMTA directly incorporates the OECD GloBE Model Rules by reference. Furthermore, as enacted in Section 2 of the GMTA, the application of these rules must be consistent with the most recent versions of the OECD’s Consolidated Commentary and any Agreed Administrative Guidance published before the start of the relevant fiscal year.

This legislative strategy has profound consequences that extend far beyond drafting convenience. It fundamentally alters the source of primary tax law for in-scope MNEs operating in South Africa. The approach effectively creates a “living law” that evolves outside of traditional domestic parliamentary cycles. Technical clarifications, interpretations, and even substantive rule changes agreed upon by the OECD/G20 Inclusive Framework in Paris can, subject to a Ministerial notice in the Government Gazette, directly and automatically alter the calculation of tax liability in South Africa. This represents a significant delegation of interpretive authority to an international body. For tax practitioners and their clients, this creates a new compliance paradigm. The focus of compliance monitoring must shift from Pretoria to Paris. Relying solely on periodic updates to South African statutes or local guidance will be insufficient and will expose MNEs to significant compliance risk. Real-time monitoring of all OECD publications on Pillar Two – including the Consolidated Commentary and the regular tranches of Agreed Administrative Guidance – is now a non-negotiable component of tax risk management.

South Africa’s Policy Choices: IIR, DMTT, and the UTPR Deferral

The GMTA implements the core charging provisions necessary to protect South Africa’s tax base while adopting a pragmatic, phased approach.

• Income Inclusion Rule (IIR): The GMTA enacts a full IIR, as detailed in Section 4 of the GMTA, which applies the Top-up Tax calculation from the GloBE Model Rules. This rule primarily targets outbound investment, allowing South Africa to tax its domestic parent entities on their share of low-taxed income earned by foreign subsidiaries.
• Domestic Minimum Top-up Tax (DMTT): The Act introduces a DMTT designed to operate as a QDMTT. This is a critical defensive measure ensuring that any Top-up Tax arising from low-taxed profits generated by constituent entities within South Africa is paid directly to the South African Revenue Service (SARS) rather than being ceded to a foreign jurisdiction under its IIR. The significance of this measure has been cemented by a recent external development. In an update published in August 2025, the OECD confirmed that South Africa’s DMTT has achieved “Qualified” status and is eligible for the QDMTT Safe Harbour. This official confirmation is not a mere technicality; it provides MNEs with critical certainty. It means the QDMTT Safe Harbour is definitively available for operations in South Africa, which can significantly reduce the compliance burden. Instead of performing the full, complex GloBE ETR calculation for their South African operations, MNEs can rely on the simplified safe harbour rules, provided the DMTT is paid.
• Strategic Deferral of the UTPR: Significantly, South Africa has made a clear policy decision to defer the implementation of the UTPR at this initial stage. Section 5 of the GMTA explicitly excludes the application of the articles in the OECD Model Rules that pertain to the UTPR. This pragmatic approach aligns with that of several other jurisdictions and reflects a cautious stance towards the UTPR’s controversial extraterritorial nature. This deferral simplifies the immediate compliance landscape for both inbound and outbound MNEs, as a foreign-parented group with a South African subsidiary does not need to worry – for now – about its South African entity being liable for a UTPR Top-up Tax related to low-taxed income in another jurisdiction. However, practitioners must advise clients that this is a deferral, not a cancellation, and future implementation remains a possibility that must be monitored.

The GloBE Calculation Engine: A Practitioner’s Walkthrough

The calculation of the jurisdictional ETR and any resulting Top-up Tax is a highly prescriptive and data-intensive process that operates as a separate and distinct tax system running parallel to South Africa’s existing corporate income tax regime. The calculation proceeds through the following core steps for each jurisdiction:

1. Determining GloBE Income or Loss: The starting point is the Financial Accounting Net Income or Loss of each constituent entity, which is then subject to a series of specific adjustments to arrive at a standardized tax base known as GloBE Income. Key adjustments include adding back net taxes expensed and excluding dividends and equity gains to prevent double taxation.
2. Calculating Adjusted Covered Taxes: The numerator of the ETR calculation, Adjusted Covered Taxes, starts with the current tax expense accrued in the financial statements. This is then adjusted for several items, most notably deferred taxes, to account for timing differences. However, any deferred tax liability included in covered taxes that does not reverse within five years is recaptured (subtracted from covered taxes), which could trigger a Top-up Tax liability in the fifth year.
3. Applying the Substance-Based Income Exclusion (SBIE): The rules provide for a carve-out for routine returns generated from substantive economic activities. The SBIE reduces the amount of GloBE Income subject to Top-up Tax and is calculated as a percentage of the carrying value of eligible tangible assets and eligible payroll costs within the jurisdiction.
4. Calculating the Jurisdictional ETR and Top-up Tax: The jurisdictional ETR is calculated using the formula:

If the ETR is below 15%, a Top-up Tax is due. The Top-up Tax Percentage (15%−ETR_jurisdiction) is applied to the jurisdictional GloBE Income after deducting the SBIE to arrive at the total Top-up Tax for the jurisdiction.

The New Compliance Gauntlet: Administration and Reporting under the GMTAA

The GMTAA establishes the procedural framework for reporting and paying the Top-up Tax, which will be administered by SARS. It introduces a new and distinct compliance cycle with specific obligations, deadlines, and penalties. SARS is actively preparing its systems, including its eFiling platform, to administer this new framework.

Registration, Notification, and the GloBE Information Return (GIR)

All Domestic Constituent Entities of an in-scope MNE Group must register with SARS for the purposes of the global minimum tax. The MNE Group’s South African entities can appoint a single “Designated Local Entity” to prepare and submit a comprehensive, standardized GloBE Information Return (GIR) on behalf of all of them, as provided for in Section 2 of the GMTAA. If the GIR is filed by the UPE or another designated entity in a jurisdiction with a qualifying information exchange agreement, the South African entities may be relieved of their local filing obligation, provided the requisite notification is made to SARS. This notification, per Sections 2 and 4 of the GMTAA, is due no later than six months prior to the filing deadline for the GIR.

Critical Deadlines and the Penalty Regime

The GMTAA sets out extended deadlines for the initial transition period to allow MNEs time to adapt.

• Filing Deadlines: For the first fiscal year an MNE Group is subject to the rules (e.g., a fiscal year commencing in 2024), the GIR must be filed within 18 months of the fiscal year-end, as stipulated in Section 3(b) of the GMTAA. For all subsequent fiscal years, the deadline shortens to 15 months after the fiscal year-end, per Section 3(a) of the GMTAA.
• Payment of Tax: Any Top-up Tax due must be paid on or before the due date for submitting the GIR, as required by Section 5(1) of the GMTAA.
• Penalty Regime: Section 8 of the GMTAA establishes a clear and escalating penalty structure for failure to file the GIR. The baseline administrative penalty of up to R50,000 is doubled if the unpaid Top-up Tax exceeds R5 million and tripled if it exceeds R10 million.
• Record-Keeping: The Act extends the standard record retention period. Under Section 9 of the GMTAA, all records necessary to demonstrate compliance must be retained for a period of seven years.

The following table provides a clear, at-a-glance summary of the key compliance actions and deadlines for an MNE with a 31 December 2024 fiscal year-end:

Compliance Action	Responsible Entity	Legislative Reference (GMTAA)	Due Date
Notify SARS of the designated GIR filing entity	All Domestic Constituent Entities	Sec 2(3)(b)(i), Sec 4(2)	31 December 2025
File first GloBE Information Return (GIR) for FY 2024	Designated Local Entity	Sec 3(b)	30 June 2026
Pay Top-up Tax for FY 2024	Designated Local Entity	Sec 5(1)	30 June 2026
File subsequent GIR for FY 2025	Designated Local Entity	Sec 3(a)	31 March 2027

Strategic Imperatives and Concluding Remarks

The implementation of Pillar Two in South Africa is not merely a tax compliance exercise; it represents a significant data, systems, and strategic challenge that requires immediate, cross-functional engagement from senior leadership.

The most pressing challenge is operational readiness. The GIR requires an extensive set of data points – estimated to be over 200 – for each constituent entity. Much of this data, such as the specific components of deferred tax expense or the carrying value of tangible assets on a jurisdictional basis, may not be readily available in an MNE’s current financial reporting or tax compliance systems. MNEs must therefore undertake comprehensive ETR modeling to identify risk jurisdictions and quantify potential Top-up Tax exposure. This must be followed by a formal data gap analysis to map required data points to existing systems and develop a clear roadmap for sourcing, validating, and storing the necessary information. This is a significant data management and IT systems project that will require substantial investment and cross-functional collaboration.

To effectively manage this transition, it is imperative that MNEs establish a dedicated, cross-functional Pillar Two readiness task force, including senior representatives from Tax, Finance, Legal, and IT. Furthermore, given South Africa’s “dynamic reference” approach, the Tax department must implement a robust protocol for continuously monitoring all publications from the OECD Inclusive Framework.

In conclusion, Pillar Two and South Africa’s swift implementation via the GMTA and GMTAA mark a permanent evolution of the international tax landscape. The era of aggressive tax competition is being curtailed, and compliance has transformed into a data-intensive, continuous process. Navigating this new environment successfully requires not just deep technical understanding but a strategic, proactive, and technologically enabled approach to global tax management.