New on FinoLib · Volume III: Finance Encyclopedia
New on FinoLib, my finance education website: I have published an article called Global Minimum Tax (Pillar Two) Explained, from Volume III: Finance Encyclopedia. Here is what the article explains, written as a short expert briefing; the full piece, with every worked example, is one click away.
The idea in plain words
Pillar Two sets a minimum tax of 15% on the profits of big multinational groups, country by country. It applies to groups with revenue of €750 million or more. It is collected first by a domestic minimum tax, then by the parent’s country, and then by other countries. As of October 4, 2026, it is law in the EU and many other places, but the January 2026 side-by-side package exempts US-parented groups from two of the three collection rules.
Key points
■The top-up applies only to profit above a carve-out for payroll and tangible assets (9.4% and 7.4% in 2026, falling to 5%).
■In the worked example a 9% jurisdiction owes a $5,665,200 top-up for 2026.
■The US declared the deal of no effect in January 2025; the G7 agreed the side-by-side approach in June 2025.
■QDMTTs still apply to US-parented groups, so their foreign subsidiaries can still pay 15% locally.
A closer look
In October 2021, 136 jurisdictions in the Inclusive Framework agreed to a two-pillar framework whose second pillar, Pillar Two, sets a global minimum corporate tax rate of 15% for large multinationals: groups with consolidated revenue of at least €750 million in at least two of the four preceding fiscal years. If a multinational’s effective tax rate in any one jurisdiction, computed under the common GloBE (“Global Anti-Base Erosion”) rules the OECD published in December 2021, falls below 15%, a “top-up tax” brings that jurisdiction’s rate up to 15%. Three rules decide who collects it, in order. First, the low-tax country itself can collect it through a qualified domestic minimum top-up tax (QDMTT). If it does not, the parent company’s country collects it under the income inclusion rule (IIR). As a backstop, other countries where the group operates collect it under the undertaxed profits rule (UTPR), typically by denying deductions.
The practical result for a US-parented group in 2026: no IIR or UTPR exposure if it elects the safe harbor, but full exposure to QDMTTs wherever it operates in a jurisdiction that has one, plus a full GloBE-style computation for those jurisdictions.
Under the hood
Under the Hood: How the Top-Up Tax Is Computed
Pillar Two taxes only “excess” profit. Before applying the rate gap, it deducts a substance-based income exclusion: a percentage of payroll costs plus a percentage of the carrying value of tangible assets in the jurisdiction. The long-run rates are 5% and 5%; transitional rates started at 10% and 8% in 2023 and, for fiscal years beginning in 2026, are 9.4% of payroll and 7.4% of tangible assets, reaching 5% from 2033. Real people and real plant therefore shrink the top-up; paper profit does not.
Decision rule
Work out Pillar Two exposure jurisdiction by jurisdiction, in this order. Scope: if consolidated revenue was below €750 million in at least three of the four preceding fiscal years, the group is out of scope. Safe harbors first: test each jurisdiction against the transitional CbCR safe harbor (available for fiscal years beginning on or before December 31, 2027) and, from 2027, the simplified effective-tax-rate safe harbor; a jurisdiction that passes needs no full computation.
The costliest mistake
Reading the side-by-side deal as “Pillar Two no longer applies to US companies.” The safe harbor switches off the IIR and UTPR only. A US-parented group with the 9% jurisdiction in the example above still owes that country’s QDMTT, if it has one: $5,665,200 for 2026, plus the cost of the full calculation and the GloBE Information Return filing. A group that stopped collecting Pillar Two data in 2025 on the strength of the headlines discovers the liability when local returns fall due, too late to restructure for that year.
Why It Matters
Pillar Two was a historic shift in international tax cooperation — for the first time, a large coalition of countries agreed to collectively limit the “race to the bottom” in corporate tax competition between jurisdictions, an outcome many observers considered politically implausible for decades given how directly it constrains individual countries’ own sovereign tax policy choices. Its reach is now narrower than agreed in 2021, as the status below shows.
Recap
Pillar Two imposes a 15% minimum effective rate, jurisdiction by jurisdiction, on profit above a payroll-and-assets carve-out, collected first by the low-tax country’s own QDMTT. As of October 4, 2026, US-parented groups are outside the IIR and UTPR under the side-by-side package but remain fully exposed to QDMTTs.
What the full article covers
The full article includes a look under the hood at the mechanics, a clear decision rule, the one mistake that costs people the most, a recap, a reveal-on-click quiz and the official sources behind every figure.
Volume III: Finance Encyclopedia
Read the full article on FinoLib
The complete article, Global Minimum Tax (Pillar Two) Explained, with every worked example, diagram, quiz and source, is free to read in Volume III, Finance Encyclopedia on finolib.com.
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