Global minimum taxation under OECD Pillar Two is fully in motion, and late‑2025 guidance has clarified key transition mechanics that will materially affect 2026 computations and filings. NZ‑headquartered groups, especially those with consolidated revenue of at least EUR 750m in two of the four fiscal years immediately preceding the tested fiscal year, should be finalising data architecture, modelling effective tax rates (ETR), and determining elections for safe harbours and transitional relief.
What’s new in the guidance
- Article 9.1 (Deferred Tax) Administrative Guidance: issued in January 2025, this narrows the use of certain deferred tax assets (DTA) from tax benefits arising after 30 November 2021. This can materially affect ETR and safe‑harbour calculations for transitional periods. However, to smooth the effect, the article also introduces a temporary grace period which allows a limited portion (capped at 20%) of deferred tax expense from the excluded DTA to be still included. The grace period is generally for fiscal years 2024 and 2025.
- Central Record of Transitional Qualified Status: updates in mid‑ and late‑2025 confirm which jurisdictions’ QDMTT and/or IIR are considered qualified for the transitional period, and where QDMTT safe harbour applies. This rule‑ordering matters, top‑up taxes paid under a qualified QDMTT can prevent further top‑up under IIR/UTPR elsewhere.
- GIR & MCAA updates: the GloBE Information Return templates, XML schema, and multilateral exchange arrangements have been updated to facilitate confidential, standardised data exchange among implementing jurisdictions, raising the bar on data quality and reconciliation.
Why this matters for 2026
Many jurisdictions’ rules apply from 2024/2025, with filings and exchanges ramping through 2026. Administrative guidance and the Central Record determine safe‑harbour availability and how taxes paid in one jurisdiction interact with others, core to avoiding mis‑stated top‑ups or double taxation.
Action checklist
- Map your footprint against qualified jurisdictions: identify where QDMTT safe harbour applies and prioritise local computations there to minimise cross‑border top‑ups.
- Reassess DTAs & credits: model the impact of Article 9.1 caps/grace period on ETRs; re‑forecast cash taxes and disclosures.
- Build GIR‑ready data pipelines: standardise entity identifiers, consolidate legal‑entity data, codify adjustments, and test XML validations well ahead of filing deadlines.
- Board reporting & controls: elevate Pillar Two to the audit committee agenda; ensure governance covers elections, data provenance, and documentation of judgments.
Professional services angle
Tax and finance teams should collaborate on a single source of truth for Pillar Two data, with external advisers validating computations against rapidly evolving guidance. A well‑controlled process is essential: mis‑steps can trigger restatements, penalties, or investor concern.
Final word
Pillar Two compliance is a systems and controls challenge as much as a technical tax issue. Treat it as a multi‑disciplinary transformation, one that can be executed smoothly with early modelling, strong data governance, and clear rule‑ordering strategies. At Moore Markhams, we understand the complexities facing New Zealand businesses as they adapt to these new international tax requirements. Our team combines deep technical expertise with practical experience helping businesses implement complex compliance frameworks.
We’re offering comprehensive GloBE readiness assessments to help you understand your obligations and develop an implementation roadmap tailored to your business needs. Contact us here to discuss how we can support your business through this significant regulatory change.
