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Switzerland chose a structurally unusual implementation path compared with the EU/UK/Canada/Australia primary-act approach. Rather than enact a standalone federal law, the Federal Council used a sub-statutory emergency ordinance under Art. 129a of the Federal Constitution (Bundesverfassung), a new provision specifically inserted by popular referendum on 18 June 2023 (78.5% yes, turnout ~58%). Art. 129a grants the Federal Council a time-limited six-year competence to implement GloBE minimum taxation by ordinance pending replacement by ordinary federal legislation. This allowed Switzerland to meet the 1 January 2024 OECD/G20 deadline without waiting for the multi-year federal legislative process (Vernehmlassung → Botschaft → Parliamentary stages).
The ordinance (SR 642.161, promulgated 22 December 2023, published AS 2023 841 on 28 December 2023) introduces only the QDMTT — the Swiss domestic top-up tax that ensures the 15% floor is collected by Switzerland before any foreign IIR can apply. The IIR (charging Swiss parent entities on undertaxed foreign subsidiaries) and UTPR were deliberately excluded from the 2024 ordinance and flagged for subsequent amendment targeting FY 2025.
in at least 2 of the 4 preceding fiscal years.
GloBE-basis, calculated following the OECD Model Rules directly referenced in the ordinance.
OECD GloBE Model Rules; reduces taxable excess profit by a payroll and tangible-asset carve-out.
apply; reduces compliance burden for groups where the Swiss ETR is demonstrably above 15%.
Administration). ESTV is building an e-filing portal for the Swiss QDMTT return; first returns and accompanying GloBE Information Returns are due 30 June 2026.
remains unaffected and continues to vary across cantons (8%–24% combined). The QDMTT top-up is computed and collected at the federal level, then shared with cantons under a revenue-sharing formula to compensate cantons whose competitive low-tax rates attracted the affected MNEs.
Switzerland hosts a disproportionate share of global MNE holding and operating structures:
(all privately held but within EUR 750M revenue threshold)
above the EUR 750M revenue threshold is also in scope.
Severity 5 reflects the combination of: 1. Structural significance: Switzerland is one of the highest-profile low-effective-tax jurisdictions globally; this QDMTT closes the 15% floor for a country that has used cantonal tax variation as a location advantage for decades. 2. Revenue scale: The Federal Council projected CHF 1–2.5 billion in additional annual federal/cantonal tax receipts from the QDMTT alone. 3. Precedent value: Switzerland's adoption confirms that even traditional tax-competitive holdout jurisdictions (alongside Singapore — see MEMTA 2024) are conforming to the GloBE floor rather than holding out for carve-outs. 4. Phased IIR/UTPR: The deliberate deferral of IIR/UTPR is a risk to watch — until IIR is implemented, Swiss-headquartered MNEs with undertaxed foreign subsidiaries (e.g., in Cayman, BVI, Dubai) are not subject to Swiss IIR charges.
cantons Zug, Geneva, Basel-City that relied on low cantonal rates for MNE attraction are lobbying for a higher cantonal share.
(Vernehmlassung) for scope and timeline.
EU IIR top-ups for Swiss profits are suppressed while the QDMTT is in force — this was the design intent.
(Bundesgesetz) must replace the ordinance within that period.
but no formal ordinance amendment has been published as of filing date.
parliamentary approval timeline.