The concurrent rollout of the EU Markets in Crypto-Assets Regulation (MiCA) and the OECD-led Global Anti-Base Erosion (GloBE) framework (Pillar Two) has created a dense compliance landscape for groups active in crypto-assets. Advisers must reconcile MiCA’s authorisation, prudential and conduct obligations for crypto-asset service providers (CASPs) with multijurisdictional GloBE reporting and minimum tax calculations that apply to multinational enterprise (MNE) groups.

This article provides a practical, multijurisdictional checklist for advisers assisting corporate groups and high-net-worth structures that operate or invest in crypto-assets. It synthesises recent Level 2 materials, supervisory briefings and OECD implementation products that affect timing, data exchange and governance expectations as of August 3, 2026.

Regulatory framework overview

MiCA is an EU regulation creating a harmonised authorisation and conduct regime for issuers of certain crypto-assets and for CASPs operating in the EU. The text is supplemented by Level 2 delegated and implementing acts that set out technical standards and reporting formats for market participants and national competent authorities. Advisers must treat MiCA as a directly applicable EU instrument with detailed RTS/ITS to follow in national supervisory practice.

The GloBE rules,commonly referred to as Pillar Two,establish a global minimum effective tax and a new set of reporting obligations (including the GloBE Information Return, GIR) for in-scope MNE groups. The OECD’s Model Rules, Commentary and subsequent implementation package provide the standard mechanics for computing effective tax rates, top-up tax and for filing the GIR. Advisers should align GloBE calculations and disclosures with local transpositions and any administrative guidance.

Both regimes have recent implementation milestones: supervisors and standard-setters have issued supervisory briefings, technical XML schemas and a common understanding on central filing and exchange of GloBE returns to support early implementing jurisdictions. These materials affect practicable timelines for first filings and data exchanges in 2025,2026 and beyond. Advisers must monitor national transposition and the operational readiness statements issued by ESMA and the OECD.

Key compliance triggers for crypto groups

MiCA authorisation is triggered where an entity issues regulated crypto-assets (e.g., asset-referenced tokens or electronic money tokens) or provides listed crypto-asset services (custody, exchange, order execution, portfolio management, etc.) within the EU. Capital, governance, AML/CFT, custody segregation and consumer information requirements can follow from authorisation. Advisers should map which legal entities in a group fall within MiCA’s perimeter early in any engagement.

GloBE applies to MNE groups above the revenue threshold set by the Model Rules (and as transposed locally). Key triggers include consolidated revenues above the threshold in the relevant fiscal year and jurisdictions that have implemented the rules for that reporting period. Crypto activity often spans multiple jurisdictions; advisers need to determine which consolidated reporting unit is the ultimate parent for GloBE purposes and whether local filings or nominee filings will be required.

Where a group both operates as a MiCA-authorised CASP (or has large crypto operating entities) and meets the GloBE scope, advisers face dual obligations: regulatory supervision, consumer protection duties and transaction-level record-keeping under MiCA, plus group-level tax reporting and top-up computations under GloBE. Early entity mapping, revenue allocation and data inventory will materially reduce operational friction.

Multijurisdictional reporting mechanics

The OECD has published the GIR XML schema and related data exchange formats to facilitate central filing and automated exchange of GloBE information between tax authorities. Jurisdictions that implemented Pillar Two for the 2024 reporting fiscal year have worked toward a common approach for central filing and exchange to support timely top-up assessments. Advisers should expect continuing technical refinements and must coordinate with local tax authorities on accepted submission routes.

National competent authorities and ESMA have published templates, supervisory briefings and central registers relevant to MiCA authorisation and disclosures (including white paper and transparency formats). CASPs should plan to provide structured datasets and audit-ready records to supervisors; coordination between compliance, tax and IT teams is necessary to avoid duplicated or inconsistent reporting across tax and prudential submissions.

Several jurisdictions have adopted transitional approaches to GIR filing and to the sequencing of administrative exchanges. For example, the UK and other implementing jurisdictions published transitional guidance describing central filing and phased operationalisation so that affected groups could meet early filing deadlines while authorities finished technical readiness. Advisers should confirm the filing channel and validation rules for each jurisdiction where their clients operate.

Practical checklist for advisers

1) Entity and activity mapping: identify all group entities that issue crypto-assets or provide crypto services and determine which fall under MiCA authorisation and which contribute to the GloBE consolidated group. This is the foundation for both regulatory applications and tax consolidation mechanics.

2) Data and systems inventory: capture transaction-level data (trades, custody records, token issuance, fees) and tax accounting data (per-jurisdiction taxable profits, taxes paid, adjustments). Confirm whether existing ERP/ledger systems can output GIR-compatible reports or whether bespoke extracts and reconciliations are required.

3) Authorisation and filing roadmaps: prepare MiCA authorisation dossiers, governance frameworks and consumer disclosures on one timeline and, in parallel, perform GloBE ETR calculations, temporary safe-harbour analyses and GIR test filings. Allocate responsibility in a written project plan and include external audit or tax counsel where appropriate.

Governance, documentation and audit trails

Robust governance and documentation reduce regulatory and tax risk. For MiCA, supervision focuses on fitness and propriety of managers, operational resilience, custodian segregation and AML controls; for GloBE, tax authorities expect traceable reconciliations from financial accounting to tax bases and documented assumptions used in ETR and top-up computations. Ensure board-level oversight and clear escalation paths for cross-cutting issues.

Maintain contemporaneous working papers linking financial statements to GloBE inputs (jurisdictional profit/loss, taxes paid, permanent/temporary differences). For crypto operations, preserve proof of token issuance, smart-contract terms where relevant, custody arrangements and fee agreements to support both prudential queries and tax examinations. Well-indexed documentation helps in fast-response regulatory enquiries and in multinational competent authority exchanges.

Where third-party service providers (custodians, exchanges, bookkeeping vendors) are used, secure contractual warranties on data accessibility and retention periods aligned with both MiCA and local tax recordkeeping obligations. Consider audit rights, data export clauses and obligations to support GIR or supervisory inspections.

Cross-border enforcement and penalties

International cooperation on tax and regulatory supervision has been strengthened to support both minimum tax enforcement and crypto market oversight. The EU and the OECD have issued instruments and working papers to facilitate information exchange and top-up assessments; advisers must therefore plan for coordinated queries across jurisdictions and potential follow-up adjustments. Timely self-review and voluntary disclosures where appropriate can mitigate interest and penalties.

MiCA empowers national competent authorities and creates a role for ESMA and the EBA in setting supervisory arrangements; failure to secure timely authorisation or to meet conduct requirements can result in administrative sanctions, market bans or reputational damage. Similarly, under GloBE, inaccurate GIR submissions or failures to file in jurisdictions that have implemented Pillar Two may trigger local top-up tax assessments and penalties. Cross-disciplinary remediation plans are therefore essential.

Advisers should also consider the operational risk of mismatched timelines: supervisory authorities may require disclosures or corrective measures on a different cadence from tax authorities’ GIR exchange. A centralised compliance calendar and a nominated cross-border compliance owner are practical mitigants.

Implementing MiCA authorisation and preparing for GloBE reporting are interconnected but distinct workstreams. Effective adviser support combines regulatory licensing know‑how, tax technical capability and project management that spans IT, accounting and legal teams. Early planning, entity-level mapping and an auditable documentation trail materially reduce the execution risk of simultaneous regulatory and tax compliance.

For complex cross-border groups and non-resident structures, bespoke advice is required to reconcile MiCA conduct obligations with GloBE tax mechanics and national transposition idiosyncrasies. If you would like a tailored checklist or an implementation roadmap aligned with the jurisdictions relevant to your group, we can prepare a scoped diagnostic and an action plan.