Over the last decade, the European Union has transformed the way tax authorities collect, exchange and analyse information. At the centre of this evolution lies the series of Directives on Administrative Cooperation (DAC), a progressively expanding legal framework designed to ensure that taxpayers operating across borders are visible to all relevant jurisdictions.With the digital economy reshaping commercial relationships, the EU has increasingly turned to DAC reforms to close information gaps, modernise enforcement tools and address new forms of tax avoidance. The recent developments, particularly DAC7 and DAC8, represent the most ambitious expansion of the regime to date, complemented by parallel global initiatives such as the OECD’s Crypto-Asset Reporting Framework (CARF).This article provides a high-level overview of the DAC trajectory and its implications for companies with activities or users in Portugal.
1. From DAC1 to DAC8: A Rapid Expansion of the EU Tax Transparency Framework
The original DAC (Directive 2011/16/EU) aimed to harmonise the exchange of information on income and assets between Member States. Initially focused on traditional financial and employment income, the framework has expanded to cover an increasingly vast universe of digital and cross-border activity.
Key DAC milestones include:
- DAC2 – implementation of the CRS (Common Reporting Standard) for financial account information;
- DAC3–DAC6 – covering tax rulings, country-by-country reporting, beneficial ownership and mandatory disclosure of aggressive tax arrangements;
- DAC7 – reporting obligations for digital platform operators;
- DAC8 – mandatory reporting for crypto-asset service providers.
The pace of expansion reflects the EU’s response to a globalised digital economy in which traditional tax controls are insufficient.
2. DAC7: The Foundation for Digital-Economy Reporting
DAC7 introduced mandatory reporting obligations for digital platform operators, requiring them to disclose seller activity to EU authorities, including income related to services, rentals, goods and certain gig-economy transactions.This reform achieved two objectives:
- It created a uniform reporting infrastructure: DAC7 established due-diligence procedures, identity-verification systems and data-exchange mechanisms that are now reused and expanded in DAC8.
- It anticipated the EU’s move into crypto-asset reporting: DAC7 served as the template for capturing previously unmonitored digital activity, paving the way for the more technologically complex reporting obligations under DAC8.
3. DAC8: Integrating Cryptoassets Into the EU Transparency Architecture
DAC8 expands the scope of administrative cooperation to cover the rapidly growing crypto-asset market. It imposes mandatory reporting obligations on crypto-asset service providers (CASPs), regardless of their jurisdiction, if they serve EU residents.
Under DAC8, CASPs must report:
- Customer identity and KYC information;
- Transfers, disposals and acquisitions;
- Crypto-crypto and crypto-fiat transactions;
- Fair-value calculations and aggregated gains.
This framework mirrors the philosophy behind CRS and brings the crypto ecosystem firmly within the EU’s transparency regime. For Portugal, where crypto adoption is relatively high, DAC8 is expected to significantly enhance the tax authority’s visibility over digital-asset activity.
4. The OECD’s CARF and the Globalisation of Crypto Transparency
While DAC8 governs crypto reporting within the EU, the OECD Crypto-Asset Reporting Framework (CARF) provides the global architecture for cross-border information exchange.
CARF requires participating jurisdictions to collect and automatically exchange data on crypto transactions, including information originating from platforms located outside Europe. Combined, DAC8 and CARF create a dual reporting system designed to prevent regulatory arbitrage and ensure that taxpayers cannot escape reporting obligations simply by using foreign exchanges.
5. Implications for Businesses Operating in or With Portugal
Companies, especially those with digital or platform-based business models, should be aware of the following:
- Expanded compliance expectations: DAC7 and DAC8 impose obligations not only on EU-based entities but also on non-EU platforms with EU users.
- Increased scrutiny from Portuguese authorities: Portugal’s tax administration will receive extensive information automatically from other Member States and CARF jurisdictions.
- Reduced tolerance for non-compliance: With real-time data analytics and automated matching to taxpayer declarations, inaccuracies or omissions may trigger enquiries or assessments.
- Need for updated governance and reporting systems: Companies must integrate DAC-aligned reporting, data retention and due-diligence procedures into their operational frameworks.
- Overlap with other regulatory initiatives: DAC reforms interact with MiCA (Markets in Crypto-Assets Regulation), the VAT in the Digital Age (ViDA) package and BEPS 2.0 measures, requiring a holistic approach to tax and regulatory compliance.
6. The Broader Policy Context: Balancing Tax Transparency and Taxpayer Rights
The EU’s tax transparency drive is part of a broader international trend, but it raises important questions about proportionality, data protection and the rights of taxpayers. Academic commentary increasingly highlights the need to ensure that expanded reporting obligations do not erode fundamental guarantees.
Nevertheless, the direction of travel is clear: digital opacity is no longer tolerated, and administrative cooperation will continue to deepen.
Conclusion
The evolution of the DAC regime marks a decisive shift toward comprehensive, technology-driven tax transparency across the European Union. With DAC7, DAC8 and CARF now converging, companies operating in or with Portugal must ensure that their compliance frameworks are aligned with the new reality of automatic information exchange, digital-economy oversight and cross-border reporting.
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