Compliance

What Compliance Teams Should Know About the EU Minimum Tax Toolkit and Reporting

A look at how the OECD toolkit and EU proposals reshape obligations under Pillar Two, DAC6, DAC7, and administrative cooperation for large MNEs.

By NomadicTax Research Team • 5‐8 min read • August 31, 2026

## Understanding the Global Minimum Tax (GMT) and EU Interactions The OECD’s **Global Minimum Tax Implementation Toolkit** (April 2026) provides guidance to help countries and companies alike implement Pillar Two (the GMT) consistently. ([oecd.org](https://www.oecd.org/en/about/news/announcements/2026/04/oecd-releases-new-toolkit-to-support-consistent-implementation-of-the-global-minimum-tax.html?utm_source=openai)) With significant overlap between GMT rules and DAC obligations in EU law, compliance teams must brace for dual obligations—and opportunities for simplification under new Omnibus proposals. ## Key Compliance Areas to Monitor - **DAC6 & Pillar Two**: The Omnibus proposes to exclude companies within the scope of the GMT (Pillar Two) from certain DAC6 reporting and to refine hallmarks that require disclosure. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/document/download/a654ad8e-606b-4ad5-a8ff-3309554224d7_en?filename=Executive+Summary+of+Impact+Assessment_DAC_Proposal+for+a+Council+Directive+-+Taxation%E2%80%99.pdf&utm_source=openai)) - **DAC7 (Platform reporting)**: Proposed changes could raise the threshold for mandatory reporting, which affects digital platforms and users of platforms—monitor whether your platform‐related income crosses new limits. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/document/download/a654ad8e-606b-4ad5-a8ff-3309554224d7_en?filename=Executive+Summary+of+Impact+Assessment_DAC_Proposal+for+a+Council+Directive+-+Taxation%E2%80%99.pdf&utm_source=openai)) - **Country‐by‐Country and Top‐Up Tax (DAC4 & DAC9)**: One of the proposed measures is streamlining the notification obligations for MNE groups across both DAC4/CbC reporting and DAC9 filing. Expect harmonised deadlines and templates. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/document/download/a654ad8e-606b-4ad5-a8ff-3309554224d7_en?filename=Executive+Summary+of+Impact+Assessment_DAC_Proposal+for+a+Council+Directive+-+Taxation%E2%80%99.pdf&utm_source=openai)) - **TIN verification & data quality**: Centralised verification systems will become vital. Inaccuracies or missing TINs can cause delays or rejections. ([taxation-customs.ec.europa.eu](https://taxation-customs.ec.europa.eu/document/download/a654ad8e-606b-4ad5-a8ff-3309554224d7_en?filename=Executive+Summary+of+Impact+Assessment_DAC_Proposal+for+a+Council+Directive+-+Taxation%E2%80%99.pdf&utm_source=openai)) ## The OECD Toolkit’s Advisories - Jurisdictions should publish timelines and make public their implementation status of GIR (Globe Information Return) portals by **31 May 2026**, or clearly communicate any delays. ([oecd.org](https://www.oecd.org/en/about/news/announcements/2026/05/global-minimum-tax-release-of-a-common-understanding-of-implementing-jurisdictions-and-further-administrative-guidance-to-support-compliance.html?utm_source=openai)) - Where jurisdictions miss deadlines, mechanisms (addressed under domestic law) are to be used to **waive penalties or suspend enforcement** while central filing via a parent or designated filing entity is in place. ([oecd.org](https://www.oecd.org/en/about/news/announcements/2026/05/global-minimum-tax-release-of-a-common-understanding-of-implementing-jurisdictions-and-further-administrative-guidance-to-support-compliance.html?utm_source=openai)) ## Steps Compliance Teams Should Take Now - Map which entities in your group are subject to Pillar Two (GMT), DAC4, DAC6, DAC7, DAC9. Assess which proposals might reduce your reporting obligations. - Audit current hallmarks of aggressive tax arrangements your company reports under DAC6—see if proposed removals or refinements align with current disclosures. - For platform operators or users of platforms: assess whether changes in thresholds under DAC7 will apply to you. - Establish or upgrade data collection and verification systems for TINs and country/location information to align with proposed central verification systems. - Stay abreast of the legislative progress: monitor when the Omnibus and DAC recast proposals are adopted, and when binding directives/regulations are published. ## Example Scenario *A large EU‐based MNE with operations in 15 Member States currently files DAC6 reports for various cross‐border arrangements. Under new rules, the company may be able to exclude these from DAC6 if subject to Pillar Two and if hallmarks are refined or certain hallmarks removed.* ## Risk Management and Penalties to Consider - If a company misapplies hallmarks under DAC6 after changes, or fails to file due to relying on proposed exclusions prematurely, there may be risk of **non‐compliance fines or audits**. - Delays in Member State implementation could create **asymmetric treatment**—where some jurisdictions adopt earlier than others, causing compliance mismatches. **In summary:** The GMT toolkit and the EU’s tax simplification proposals offer a roadmap to reduce burdens—if you move early and align your systems with what's coming. Be strategic about what reporting you can drop, refine, or consolidate.