President Donald Trump on Friday threatened to impose a 100% tariff on all goods from any country that levies a digital services tax on American technology companies — a sweeping ultimatum issued the day after European Union member states gave final ratification to a transatlantic trade agreement his administration had spent nearly a year negotiating. The problem for anyone trying to calculate the risk: no legal authority currently available to the president would permit a 100% tariff on any country, and the broadest tool he has in use expires in 26 days.

Trump posted on Truth Social on Friday, writing that European countries discussing the “imminent” implementation of digital services taxes were “close to actually doing this” and warning that any country that moved forward would be “immediately met with a 100% TARIFF on any and all Goods.” He added that the tariff would override any existing trade agreements, “whether implemented, signed, or not.”

The European Commission responded within hours. “Unilateral measures targeting such legitimate policies are unjustified,” said Olof Gill, a spokesperson for the commission. “If pursued, the EU will respond swiftly and decisively to defend its rights and regulatory autonomy.” The commission characterized digital services taxes as non-discriminatory policies applied equally to all large technology companies regardless of national origin.

What Are Digital Services Taxes and Why Do They Trigger Tariffs?

Digital services taxes are levies on the gross revenues that large technology companies generate in a jurisdiction where they have no physical corporate presence. Under the corporate tax rules that govern most countries’ international tax obligations, a company must maintain a physical establishment in a country before that country can tax its profits. The result is that companies such as Meta, Alphabet, Amazon, and Apple can generate enormous revenue in European markets while paying little or no local income tax.

DSTs are designed to capture that value. They are assessed on revenue rather than profit, at rates ranging broadly from 1.5 percent to 7.5 percent across European jurisdictions, and they apply to companies above defined global revenue thresholds, meaning they fall almost exclusively on large American tech firms. Nine EU member states — including France, Spain, Italy, Austria, Denmark, Hungary, Poland, and Portugal — have already implemented DSTs, and the United Kingdom, Switzerland, and Turkey have their own versions. Several more countries, including Belgium, the Czech Republic, Latvia, Slovakia, and Slovenia, have proposed or explored similar measures.

The Trump administration has consistently characterized DSTs as targeted discrimination against American companies. That position has formal legal backing: the U.S. Trade Representative initiated Section 301 investigations into DSTs in France as early as 2019 and expanded those investigations to nine additional European and non-European jurisdictions in 2020, determining in each case that the levies were actionable under U.S. trade law as unreasonable and discriminatory practices that burdened American commerce.

Why the U.S. Helped Create the Problem It Is Now Trying to Punish

The DST expansion that Trump has threatened to punish with 100% tariffs was not a unilateral European initiative. It is, in significant part, a consequence of a U.S. policy decision.

For more than a decade, the Organization for Economic Cooperation and Development had been building a global framework — known as Pillar One — that would have resolved the digital taxation dispute by reallocating a portion of the profits of large digital companies to the countries where their users are located, replacing national DSTs with a multilateral system. Most European countries adopted their DSTs explicitly as temporary measures, pending an OECD agreement that would make them unnecessary.

That exit ramp disappeared in January 2025, when the Trump administration withdrew the United States from the Pillar One negotiations. With no prospect of a multilateral replacement, European governments that had been holding their DSTs as interim measures now had no reason not to make them permanent — and governments that had been considering new DSTs had no reason to wait. The European Commission has since resumed discussions about an EU-wide digital levy to help fund the bloc’s long-term budget and repay post-pandemic loans. Estimates suggest an allied European digital tax could generate upward of €40 billion annually.

Trump’s threat, in other words, is a response to a proliferation that his own policy accelerated.

The Legal Problem: What a 100% Tariff Would Require

The executive branch’s legal authority to impose tariffs has been substantially curtailed by the courts in 2026, leaving the administration with a narrow and time-limited set of tools — none of which supports a 100% rate.

The broadest authority the president had used was the International Emergency Economic Powers Act, which Trump invoked beginning in 2025 to impose sweeping tariffs on nearly every U.S. trading partner. The Supreme Court ended that authority in its February 20, 2026 ruling in Learning Resources, Inc. v. Trump, holding 6–3 that IEEPA does not authorize the president to set tariffs. The majority cited the major-questions doctrine — the principle that a federal law cannot be interpreted to delegate vast economic or political powers unless such powers are clearly identified.

Within hours of that ruling, Trump invoked Section 122 of the Trade Act of 1974, imposing a global surcharge on imports that now stands at 15% — the statutory maximum. Section 122 was enacted in 1974 as a temporary balance-of-payments instrument, deliberately capped by Congress at 15% and limited to 150 days. That 150-day clock runs out on July 24, 2026 — 26 days from today — and the president cannot extend it unilaterally. A divided panel at the U.S. Court of International Trade also struck down the Section 122 tariffs in May 2026, though the Federal Circuit stayed that ruling pending appeal.

The only remaining tool with no statutory rate ceiling is Section 301 of the Trade Act of 1974, which authorizes the U.S. Trade Representative to investigate and retaliate against foreign trade practices deemed unfair or discriminatory — and which, unlike IEEPA, has no limit on how high a tariff rate can go. White House officials have indicated that Section 301 is the intended mechanism for executing the threat.

But Section 301 is not a switch the president can flip. It requires a formal investigative process administered by the USTR, including written public submissions, a public hearing, an interagency review, a legal determination that the foreign practice is actionable, and consultation with the target country. USTR has 12 months to complete that process in cases not governed by a trade agreement. An “accelerated” timeline, which the administration has claimed for some of its current Section 301 investigations, can compress that process — but it cannot produce an “immediately imposed” tariff, as Trump’s post described. The administration also faces the question of whether DSTs can be found actionable under Section 301 against countries that have already finalized trade agreements with the United States, since the EU-US deal was ratified just Thursday.

What the EU-US Trade Deal Does and Does Not Protect

The transatlantic trade agreement that EU member states formally approved on Thursday, June 25, 2026, caps most tariffs on European exports to the United States at 15%. The deal, first announced politically at Trump’s Turnberry golf resort in Scotland in July 2025 and formalized in a joint statement the following month, required the EU to eliminate its tariffs on U.S. industrial goods and ease access for American agricultural products. It runs through the end of 2029, and includes a suspension clause that allows Brussels to pause the EU’s concessions if Washington violates its terms.

Digital services taxes were explicitly excluded from the agreement’s scope and have remained one of the most persistent points of friction in transatlantic trade. Trump has set a July 4, 2026 deadline for both sides to begin implementing the deal’s terms. His Friday post threatened that the DST tariff would supersede the negotiated 15% ceiling — “whether implemented, signed, or not” — raising the prospect that the deal’s economic rationale, already fragile after a year of rocky ratification, could be undercut before it takes effect.

Whether the EU’s trade lawyers would agree that a unilaterally imposed DST tariff legally supersedes the binding trade agreement the two parties just concluded is a separate question from whether the administration would attempt it.

A Familiar Playbook, With a New Legal Environment

Trump’s threat follows a pattern his administration has used before. In his first term, the USTR launched Section 301 investigations into French and other European DSTs in 2019 and 2020, eventually determining that six countries’ DSTs were actionable and announcing 25% retaliatory tariffs — which were then suspended pending OECD negotiations. Last year, Canada rescinded its 3% digital services tax just hours before it was set to take effect, specifically to prevent a rupture in trade talks with Washington.

The difference now is the legal environment. The SCOTUS ruling that killed IEEPA, the Section 122 expiration three weeks away, and the procedural requirements of Section 301 all mean that executing a 100% tariff “immediately” — as the post described — requires legal authority the administration does not have. What the administration does have is an ongoing Section 301 investigation infrastructure, a documented record that DSTs are actionable under U.S. trade law, and a track record of using threatened tariffs as negotiating leverage even when the legal path to immediate execution is unclear.

Whether European governments interpret the threat as leverage or as policy will define how quickly this dispute escalates — and whether the transatlantic trade agreement ratified barely 24 hours ago survives the month.

What Is at Stake for Tech Companies and European Exporters

For the U.S. technology sector, the DST dispute involves substantial sums. Any EU-wide digital levy at a meaningful rate would draw revenue overwhelmingly from American companies — the same firms whose global revenue thresholds make them the primary targets of every national DST already in place. Meta, Alphabet, Amazon, and Apple generate billions in European revenue that, under current corporate tax rules, is taxed in low-rate jurisdictions rather than in the countries where European users actually generate it.

For European exporters, the stakes run in the opposite direction. A 100% tariff on all goods from a country implementing a DST would be more than six times the 15% ceiling those exporters believed they had secured through a year of painful trade negotiations. Major European export industries — German autos, French luxury goods and agricultural products, Italian manufactured goods — would face an effective market shutdown if the threat were executed at scale. The EU’s suspension clause in the trade deal was designed for exactly this kind of contingency, but invoking it would restart the tariff war both sides had sought to end.

Markets on Friday appeared to take a measured view. But trade analysts have noted that the threat lands at a moment when the administration’s legal toolkit is unusually depleted, its primary tariff authority expires in less than a month, and the Section 301 path to meaningful retaliation requires months of procedural work the administration has not yet completed on this specific issue.

For now, the 100% tariff exists as a Truth Social post. Its legal execution would require either a congressional grant of new authority, the completion of a formal Section 301 investigation process, or a presidential action that courts would be expected to challenge within days.

Frequently Asked Questions

What is a digital services tax, and why does the U.S. oppose it?

A digital services tax is a levy on the gross revenues that large technology companies generate in a country where they have no physical corporate presence. Because international tax rules require a physical establishment before a country can tax a company’s profits, firms like Google, Meta, and Amazon can earn billions in a country while paying little local income tax. European governments adopted DSTs to capture that revenue. The U.S. opposes them on the grounds that they effectively discriminate against American companies, since the global revenue thresholds that define eligibility fall almost exclusively on U.S. tech giants.

Does Trump have the legal authority to immediately impose a 100% tariff on European goods?

No available legal authority supports it. The Supreme Court’s February 2026 ruling in Learning Resources, Inc. v. Trump ended the president’s ability to impose tariffs under the International Emergency Economic Powers Act. Section 122 of the Trade Act of 1974 — the tool the administration is currently using — caps tariffs at 15% and expires July 24, 2026. Section 301 of the Trade Act, the remaining tool with no rate ceiling, requires a formal investigative process that takes up to 12 months. None of these authorities supports an immediately imposed 100% tariff.

Does the EU-US trade deal protect European exporters from this threat?

The deal ratified June 25, 2026 caps most EU export tariffs at 15%. Digital services taxes were explicitly excluded from the agreement. Trump’s post claimed any DST tariff would supersede existing trade deals, but whether that claim could be executed unilaterally — and survive legal challenge — is contested. The EU’s trade deal includes a suspension clause that would allow Brussels to halt its own concessions if Washington violates the agreement’s terms.

Why are European countries expanding their digital services taxes now?

The primary driver is the U.S. withdrawal from OECD Pillar One negotiations in January 2025. Most European DSTs were adopted as temporary measures pending a multilateral agreement that would have replaced them. With that framework abandoned, European governments have no diplomatic off-ramp to wait for — and the EU Commission has resumed discussions about an EU-wide digital levy to fund the bloc’s long-term budget.