Invest1 publisher2 min readPublished
Treasury lets US multinationals elect out of Pillar Two's two top-up rules
The revised GloBE Information Return, announced September 11, lets US-headquartered groups that meet domestic minimum tax thresholds treat home compliance as enough. That relief holds only while other tax authorities agree to it.
The Investor · Invest desk
What happened
- Treasury overhauled the GloBE Information Return on September 11, adding a side-by-side safe harbor that lets US-headquartered groups opt into compliance primarily under domestic global minimum tax law.
- Groups already meeting minimum tax requirements at home can sidestep two Pillar Two provisions, the income inclusion rule and the undertaxed profits rule, as other jurisdictions would apply them.
- The return it replaces was adopted in January 2025 under the Biden administration and assumed US corporate groups would have to comply fully with the OECD's Pillar Two regulations.
- The revised return also standardizes jurisdictional reporting in place of a patchwork of local filings and writes in protections for US substance-based incentives, including specific safeguards for the R&D credit.
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Why it matters
- exposure The rules being waived belong to foreign tax authorities, so a US filer's bill now turns on discretion Treasury does not control.
- decision Tax departments have to price three cases: domestic-only compliance, full Pillar Two, and an election that a foreign authority declines to honour.
- capability R&D-heavy filers in technology and manufacturing can keep the credit's cash value without a global minimum tax calculation clawing it back.
Treasury wrote the safe harbor, but the money it saves is money other tax authorities would have collected. Under the election, a US-headquartered group that satisfies domestic minimum tax thresholds treats its US compliance as sufficient and avoids duplicative income inclusion rule and undertaxed profits rule liabilities imposed by other jurisdictions [2]. Those liabilities are assessed abroad. cryptobriefing.com reports that if major trading partners view the safe harbor as a backdoor exemption from global minimum tax commitments, they could impose compensatory measures, including applying the UTPR to US companies regardless of the election [9].
What the election is worth cannot be computed from what has been published. The account of the revisions names neither the domestic minimum tax threshold a group has to clear nor any figure for the tax at stake [12]. What is specified is the shape: an election [2], resting on an OECD/G20 Inclusive Framework agreement reached in January 2026 among more than 145 countries on how to coordinate around the 15% minimum [6].
The return being replaced is young. Adopted in January 2025 on the assumption that US corporate groups would comply fully with Pillar Two [4], it ran twelve months before the Inclusive Framework agreement that undercut the assumption [11]. The election leaves the foreign rules in place and asks other authorities to stand down [2]. Companies spent that year building data collection for a filing whose premise has now been reversed.
Treasury Secretary Scott Bessent framed the changes as advancing President Trump's international tax objectives, according to cryptobriefing.com [8]. The same account describes the Biden Treasury as having pushed for full integration with Pillar Two and the current team as carving out space for a primarily domestic compliance regime [5]. Treasury's negotiating capital is going into getting the election respected abroad.
My read: the safeguards for the R&D credit are the part of this package that does not depend on foreign forbearance [7], while the carve-out from the income inclusion rule and the undertaxed profits rule is contingent on the behaviour of the 145-plus countries in the January 2026 agreement [6] and is worth nothing to a group whose profits sit in a jurisdiction that tops up anyway [9]. That read could be too gloomy. If the standardized jurisdictional reporting cuts filing cost enough on its own [7], the election pays for itself even where a partner applies the UTPR. And if the January 2026 agreement binds tightly in practice, the contingency never gets tested.
What to watch
- Whether any Inclusive Framework jurisdiction applies the undertaxed profits rule to a US group that has made the side-by-side election.
- Publication of the threshold and computation rules that decide which US groups actually qualify for the safe harbor.
- Whether R&D-credit-heavy filers change effective tax rate guidance once they have modelled the election.