Cyprus opens data on 15% corporate tax

Cyprus's parliament voted unanimously to let its tax authority automatically share corporate tax data with every other EU country (Stockwatch). The law transposes DAC9, the EU directive that builds the information-exchange plumbing around the global minimum corporate tax. On its own, a reporting rule. But it lands inside a wider shift: for Europe's largest corporate groups, low headline tax rates no longer settle the bill. The system that checks what companies actually paid now matters more.

Three Steps from Global Rule to Your Country's Tax Office

The chain has three links. First, the OECD designed Pillar 2: a framework that says corporate groups earning at least €750 million a year must face a minimum 15% effective tax rate everywhere they operate (OECD). "Effective" is the key word. The test is not what the headline rate says but what a company actually pays after deductions, credits and exemptions.

The EU then made that OECD framework binding through its Minimum Tax Directive, which all member states must apply (EUR-Lex). If a group's effective rate in one country falls below 15%, a top-up tax fills the gap. The low-tax country gets first shot at collecting the missing amount itself. If it doesn't, the parent company's home country can collect instead (OECD).

Third comes DAC9, the directive Cyprus just adopted. It creates the data channel. A multinational files one standardised return showing its structure, profits and tax calculations for every jurisdiction. One tax authority receives the return and passes the relevant pieces to other EU countries (EUR-Lex, Council of the EU). Without this layer, each country sees only its own slice. With it, authorities can verify whether a group genuinely meets the 15% floor across the EU.

Ireland Shows How the Old Model Adapts

Ireland is the clearest example of what this means in practice. Dublin has not scrapped its 12.5% corporate tax rate, but for companies covered by Pillar 2, it now charges a 15% effective minimum and collects the difference through its own domestic top-up tax (Irish Statute Book). The logic is straightforward: if someone is going to collect the gap between 12.5% and 15%, Ireland would rather it be Ireland than, say, Germany.

Ireland's first Pillar 2 payment deadline passed on 30 June 2026. Half-year corporation-tax receipts came in at roughly €13.7 billion, up 4.7% year on year (Irish Times, Deloitte). Public data does not yet isolate how much was top-up tax. But the system is running.

Hungary shows the flip side. Its 9% headline rate remains the EU's lowest (EU Council). For small domestic companies, that still applies. For large multinationals inside Pillar 2, the 9% number no longer guarantees an advantage, because the top-up mechanism fills the gap to 15% regardless (PwC). Hungarian tax commentary frames the reform mainly as a reporting burden: deadlines, calculations and data exchanges (Adóvilág).

The Netherlands faces a different exposure. Dutch corporate structures have long been used to route royalties and interest payments through entities with little real activity, moving taxable profits away from higher-tax countries. Pillar 2 reduces the tax saving from such arrangements, and DAC9 makes them visible to other countries' authorities (Rijksoverheid). The conduit companies will not vanish overnight, but the incentive to create new ones weakens.

Who Gains, Who Pays

National treasuries gain two things: visibility into how multinationals structure their tax, and where they adopt domestic top-up taxes, the right to collect revenue that might otherwise flow to another jurisdiction. Large multinationals lose some benefit from low-rate countries, because a 12.5% or 9% headline rate no longer settles the question of what they owe. Tax advisers and compliance firms gain work: effective-rate calculations and standardised returns are new services on top of ordinary corporate tax (Alvarez & Marsal). Small and mid-sized firms below the €750 million threshold are largely untouched (OECD).

The Council sells DAC9 as simplification: one filing instead of many duplicates (Council of the EU). Whether companies experience it that way depends on whether the central return replaces local filings or adds a layer above them. Nominal tax competition among EU member states is not dead. But for the companies large enough to trigger Pillar 2, the contest is shifting: which country can run the compliance system without crushing the businesses it wants to attract.