How Global Minimum Tax and Ring-fencing Losses Are Changing South Africa’s Tax Landscape

Introduction to GloBE Model Rule & Ring-Fence Loss Amendments

Global tax rules are evolving. Among South Africa’s recently enacted tax policies: amendments to Section 20A of the Income Tax Act altering how business losses are ring-fenced, and the implementation of the Global Minimum Tax (GMT) under the OECD's Pillar Two. Both impose tighter compliance demands on multinational groups and certain taxpayers. (sars.gov.za)

Section 20A Loss Ring-fence Changes

• Previously, under Section 20A, a taxpayer could only utilize assessed business losses against taxable income above a certain maximum marginal rate, which used to be 45%.
• As of years of assessment commencing on or after 1 March 2026, the ring-fencing rule now applies once that taxpayer reaches 39% marginal rate instead of waiting for the 45% bracket. (sars.gov.za)

Impact on Loss-Making Businesses

• Earlier triggering of the limitation: Taxpayers start being limited in using losses once they reach 39% tax bracket—higher up on income scale. Might reduce ability to offset losses if income growth pushes them into those levels.
• Those whose assessment years end before 1 March 2026 continue under the old rules.

Global Minimum Tax (GMT) Pillar Two Regime

Effective for fiscal years beginning on or after 1 January 2024, the GMT regime requires

• Multinational Enterprise (MNE) groups with consolidated revenue above €750 million (~R15 billion) to file a Global Minimum Tax Return (GMT01), along with declaration and tax calculations.
• Payment of a top-up tax when income in any jurisdiction falls below the 15% minimum effective tax rate.
• South Africa has the Income Inclusion Rule (IIR) and Domestic Minimum Top-up Tax (DMTT) to enforce compliance with the 15% floor. (sars.gov.za)

Actionable Implications for Businesses and Multinationals

1. Evaluate corporate structure & flow of profits: If you're operating across borders, look at where revenue is earned vs taxed. If subsidiaries or branches in low-tax jurisdictions feature, you may owe top-up tax under GMT.
2. Re-assess timing of using assessed losses: Businesses approaching the 39% bracket must plan use of losses carefully—they’ll start being ring-fenced sooner.
3. Stay compliant with GMT reporting: Familiarize your teams with GMT01/GMT02 forms, keep data clean. Non-fulfillment may trigger penalties or reputational risk.
4. Use international tax treaties & planning strategies: DTAs, entity location, profit shifting, and tax credits become more important under GMT scrutiny.

Practical Example

MegaGroup Ltd, operating in South Africa and abroad, earns large profits in high-tax jurisdictions but uses losses generated in earlier years. Under the new Section 20A rules, it may no longer offset large accumulated losses as freely once crossing the 39% marginal rate — limiting deductions.

Additionally, if MegaGroup has a subsidiary in a country where the effective tax rate is below 15%, Top-up Tax will represent incremental liability when consolidating under GMT.

Summary & Best Practices

High impact changes demand proactive planning: understand where your business sits on the margin, track where revenues and taxes arise, keep strong tax reporting systems, and ensure treaty-based relief is correctly applied. The combination of ring-fencing earlier and GMT compliance may significantly alter the tax burden for cross-border and loss-absorbing firms.

Category: Compliance
Author: NomadicTax Research Team
Read Time: 6 min
Published: true