Switzerland-EU Tax Transparency: Revised AEOI Protocol Moves Forward

Executive Overview

On 24 June 2026 the Federal Council adopted the dispatch on the Protocol of Amendment to the agreement between Switzerland and the European Union on the automatic exchange of financial account information. The protocol had been signed in October 2025. It aligns the bilateral framework with the revised OECD Common Reporting Standard, which Switzerland has implemented from 2026, and introduces provisions on administrative assistance for the recovery of VAT claims.

The direction of travel is clear rather than dramatic. Tax transparency between Switzerland and the European Union is becoming broader in scope and more operationally connected, and the practical consequence is that the information reaching a tax authority increasingly needs to be consistent with the documentation held by the taxpayer and by the financial institution.

Regulatory Background

The revised Common Reporting Standard broadens and refines the information exchanged on financial accounts. Switzerland's alignment of the bilateral agreement with that revised standard means that the classification of account holders and controlling persons, the data captured at onboarding and the periodic review of that data all need to be tested against the updated requirements rather than against the version previously applied.

The protocol also adds administrative assistance for the recovery of VAT claims. This is a distinct mechanism from the automatic exchange of financial account information and should not be conflated with it: one concerns the periodic reporting of account data, the other concerns cooperation in collecting an established VAT claim. The underlying agreement continues to contain rules on withholding-tax exemptions for certain dividends, interest and royalties between related entities, which remain relevant to the design of cross-border group structures.

Why It Matters

The amendment matters less for what it reveals than for the consistency it demands. Automatically exchanged data is compared with declared positions, and divergences generate questions even where the underlying tax position is correct.

• Swiss financial institutions and intermediaries, which must apply the revised CRS classification, due-diligence and reporting requirements to new and existing accounts.
• International families and family offices with accounts and structures spanning Switzerland and the European Union, where reporting reaches several jurisdictions simultaneously.
• Entrepreneurs and investors resident in an EU Member State holding Swiss accounts, for whom declared income should reconcile with reported account data.
• Swiss and foreign companies within cross-border groups, particularly where withholding-tax exemptions on dividends, interest or royalties are relied on.
• Groups with EU VAT exposure, which should note that cooperation on the recovery of VAT claims is being strengthened alongside information exchange.
• Trustees and corporate service providers, who are frequently the source of the entity classification and controlling-person data that is ultimately reported.

Practical Issues to Review

1. 01Review entity and account-holder classifications under the revised CRS, including the identification of controlling persons, and update self-certifications where the analysis has changed.
2. 02Test the quality and currency of account data, including tax residence, addresses and identification numbers, since reporting errors are typically data errors.
3. 03Reconcile the information likely to be reported with the positions declared in the relevant state of tax residence, and document any legitimate differences.
4. 04Verify that reliance on withholding-tax exemptions for dividends, interest or royalties between related entities is supported by current documentation and substance.
5. 05Assess EU VAT positions and registration status in light of strengthened cooperation on the recovery of VAT claims.
6. 06Confirm that the documentation held by the entity, its bank and its advisers describes the same structure, ownership and control.
7. 07Establish a review trigger for changes in residence, ownership or control, so that reported data does not become stale between reporting cycles.

TCC View

TCC's view is that cross-border structures should be reviewed from both a substantive-tax and a reporting perspective at the same time. A position that is technically correct but inconsistently documented can still generate questions once data is automatically exchanged, and answering those questions after the event is invariably more burdensome than preparing for them.

We would place particular emphasis on the coherence of the file across counterparties. Where a bank, an operating company and a family holding describe the same arrangement in slightly different terms, the divergence itself becomes the subject of enquiry. Reconciling those descriptions is unglamorous work, but it is the most reliable protection available in an environment where information moves automatically.

Planning Note

The protocol has been adopted at dispatch stage and remains subject to the ordinary parliamentary process, so timing and final form should be monitored rather than assumed. In the meantime, the revised CRS already applies in Switzerland from 2026, which means the documentation and classification work is current regardless of the protocol's progress. Structures should be reviewed before the next reporting cycle rather than after it, and any planned change in residence, ownership or account structure should be considered in light of the data that will be exchanged for the year in which it occurs.