ANALYSIS: Trump, the Supreme Court and the Digital Tax — 100% Tariffs, But Under What Authority?

ANALYSIS: Trump, the Supreme Court and the Digital Tax — 100% Tariffs, But Under What Authority?

Introduction: A president without his favorite weapon — but never without ideas

February 20, 2026: the day the Supreme Court said no

On February 20, 2026, the United States Supreme Court handed down a ruling that changed the rules of global trade. In a landmark decision, nine justices — several of them appointed by Trump himself — held that the International Emergency Economic Powers Act of 1977 (IEEPA) did not authorize the president to impose tariffs. All surcharges imposed under IEEPA — including the famous "reciprocal" tariffs of April 2025 — were invalidated. It is an unprecedented institutional blow to Trump's trade doctrine.

But Trump is not a man to be left without tools. On June 26, 2026, barely four months after the Court's ruling, he brandishes a new threat: a 100% tariff on exports from any European country that imposes a "digital services tax" on American tech companies. This is not a bluff — it is the resumption of a trade war by other legal routes. And the grey zones Trump is exploiting are numerous and carefully targeted.

The new battlefield: digital services taxes

"Digital services taxes" (DST) are at the heart of the USA-Europe trade confrontation in 2026. These taxes, levied on the gross revenues of American tech companies — Meta, Alphabet (Google), Amazon — operating in European markets, are presented by Washington as disguised commercial discrimination specifically targeting Silicon Valley giants. Several European countries have adopted or are considering these taxes: France and the United Kingdom had them, some suspended them under American pressure, others maintained or are planning to adopt them.

Trump has been clear: "Certain countries are close to doing it" — imposing a DST — and he will respond with "levies immediately" at 100%. And to ensure no trade deal protects dissenters: "This tariff will supersede the trade agreements made with the country, whether they are implemented, signed, or not." This is a declaration of unilateral trade war — and a major constitutional question.

The IEEPA ruling: what the Supreme Court actually said

A decision that redraws presidential powers in trade

The ruling of February 20, 2026 is of considerable constitutional importance. The Supreme Court ruled plainly: the 1977 IEEPA, adopted to allow the president to respond to "unusual and extraordinary threats" from abroad through economic measures, does not include the power to impose tariffs. Tariffs, the Court held, fall under the Congress's legislative power and can only be delegated to the executive in a limited and explicit manner.

Immediate consequence: all tariffs imposed by Trump under IEEPA since his return to the White House — including the spectacular "reciprocal" tariffs of April 2025 that had shocked global markets — were invalidated. This decision was welcomed by America's trading partners, who see it as confirmation of American checks and balances and the rule of law. According to the European Parliament, the ruling "confirms checks and balances and the rule of law in America."

What Trump can still do

The IEEPA ruling does not fully disarm Trump. He retains several legal avenues for imposing tariffs. The first he immediately activated: the global 10% tariff on all imports, imposed under Section 122 of the Trade Act of 1974 — a little-known provision allowing the president to impose tariffs in case of serious trade deficits. These 10% tariffs expire after 150 days, however, and can only be extended by Congress.

Other avenues are under exploration: investigations into "unfair trade practices" under Section 301 of the Trade Act — which Trump has already used against China — and sectoral tariffs under Section 232 for "national security" reasons (used for steel and aluminum during the first term). These tools exist, are legal, but are slower, more constrained, and require documented investigations. Nothing as expedient as IEEPA.

The 100% threat on digital taxes: legal or not?

The legal vacuum Trump intends to exploit

The great question raised by the threat of a 100% tariff on DST-imposing countries is: under what legal authority? As the Washington Times notes, after the IEEPA decision, "it is unclear what law or authority the president would use" to impose this tariff. This is a significant admission: Trump is threatening without having clearly identified the legal basis for his threat.

Several possibilities exist. A Section 301 investigation into DSTs as "unfair trade practices" would allow the imposition of targeted tariffs after investigation — but the process takes months and requires public documentation. A national emergency declaration could activate other economic emergency powers — but courts will watch closely for any attempt to circumvent the IEEPA ruling. A special act of Congress could confer the necessary powers — but Congress is slow and divided.

The Canada precedent: a lesson for Europe

The example of Canada is instructive for Europe. Last year, Trump convinced Ottawa to abandon its digital services tax while the two countries negotiated a trade deal. Canada yielded — its economic dependence on the United States (more than 70% of its exports go to the USA) left it little room to maneuver. Europe is in a different position: its internal market is comparable in size to that of the USA, and its dependence on American exports is real but less existential than Canada's.

But Europe has its own vulnerabilities. Its exports to the United States — German cars, French agrifood, Swiss pharmaceuticals — are exposed. A 100% tariff targeted at one or more European countries would create unbearable political pressure in those countries. The Canadian example shows that even strong partners can yield under American commercial pressure if the administration is determined enough.

The tech giants: Meta, Google, Amazon in the crosshairs

Why DSTs structurally target the GAFA

Digital services taxes are designed — intentionally or not — to hit the GAFA. Their mechanism is simple: they are levied on the gross revenues generated by digital companies in a country, regardless of where those companies are registered for tax purposes. This directly targets the model of Meta (advertising revenues), Alphabet (Google, YouTube), and Amazon (e-commerce, AWS), which generate massive revenues in Europe while optimizing their tax burden through Irish or Luxembourgish structures.

From the American perspective, these taxes are discriminatory: they target sectors where the United States dominates. From the European perspective, they correct an inequity: companies that profit from European markets without contributing their fair share in taxes. This debate is more than ten years old and has never been resolved through an agreement acceptable to both parties. The OECD attempted to build a "Pillar 1" framework for the taxation of digital multinationals — but progress has been slow and Trump has always been hostile to this initiative.

American companies caught between two fires

Meta, Alphabet, and Amazon find themselves in an uncomfortable position: their European operations are threatened on one side by European DSTs, and on the other by European regulation (DSA, DMA, GDPR) which imposes costly obligations. These companies have generally pressured Washington to defend their right to operate in Europe without additional taxation — pressure that partly explains Trump's firmness on this issue.

But the GAFA also have interests in maintaining their European operations, which represent a significant share of their global revenues. A 100% tariff on exports from a European country to the USA — say, German cars — would hurt the German economy but would not resolve the DST problem. The logic of cross-retaliation is clear: Europe taxes American digital services, the USA taxes European goods in retaliation. Consumers on both sides pay the bill.

The post-ruling IEEPA landscape: a decision with global consequences

What the invalidation of IEEPA tariffs means for trade partners

The IEEPA decision has considerable implications beyond US-Europe relations alone. It means that tariffs imposed under IEEPA on China, Mexico, Canada, and other partners are also invalidated. This has created a period of legal and diplomatic drift — foreign governments have received contradictory signals about what value to place on trade deals concluded with the Trump administration.

As the European Parliament notes, the decision "is likely to encourage the United States' trading partners to seek clarifications or even renegotiation of recently concluded agreements." This is diplomatic language for: partners no longer know where they stand, and the credibility of American trade commitments is seriously damaged.

Congress in the equation: can it extend the 10% tariffs?

The 10% tariffs imposed under Section 122 expire after 150 days without congressional extension. This is a sword of Damocles hanging over American trade policy in 2026. Trump will need to negotiate with a Republican Congress that includes a free-trade faction reluctant to accept generalized tariffs — an ideological tension within the Republican Party between free-trade traditionalists and Trumpian economic nationalists.

If Congress refuses to extend the 10% tariffs, Trump will be in a position of considerable trade weakness. He will then seek to activate other powers — Section 232, Section 301, perhaps even new emergency legislation — to maintain his tariff arsenal. These alternatives are legally more solid than the invalidated IEEPA, but they are also slower and more constraining.

Europe facing Trump: strategies of resistance and compromise

The European response: retaliatory measures and diplomacy

The European Union is not without ammunition in the trade war with Trump. It has already assembled lists of American products susceptible to retaliatory tariffs — products carefully chosen to maximize political pain in swing American states: Kentucky bourbon, Wisconsin Harley-Davidsons, Midwest agricultural products. This "political targeting" strategy aims to create pressure on American lawmakers whose districts export to Europe.

In parallel, Brussels is seeking to negotiate a comprehensive trade agreement with Washington — a Trump-style "deal" that would allow the American administration to claim a visible victory. The June 2026 European summit cited the United States among trade partners with whom deal discussions were underway. But US-EU trade negotiations have a long history of dead ends — the last major agreement (TTIP) was abandoned without conclusion after years of talks.

Digital taxes: an existential bone of contention

The DST question is at the heart of a structural dispute that will not be resolved by a simple trade agreement. Europe has the right — and indeed the duty to its taxpayers — to impose fair taxes on companies making profits on its territory. The United States has the right to defend its companies against what it perceives as discrimination. Both positions are legally defensible.

The solution should have come through an international agreement — the OECD's "Pillar 1," which would have established global rules on the taxation of digital multinationals. The United States participated under Biden. Under Trump, the United States largely torpedoed this process, preferring an aggressive bilateral approach. The result is a tax war that will last for as long as Trump remains in the White House — and potentially beyond.

Trump's legal grey zones: an inventory

Section 232: national security as commercial pretext

Section 232 of the Trade Expansion Act of 1962 allows the president to impose trade restrictions on imports that threaten national security. It was used during Trump's first term to impose tariffs of 25% on steel and 10% on aluminum — with national security justifications that were contested but ultimately upheld by the courts. This provision remains available in 2026 and could be applied to new sectors.

The question is: can a 100% tariff on exports from a specific European country be justified on "national security" grounds because that country imposed a DST? This is a legally fragile but politically exploitable argument. Trump has already used Section 232 creatively in the past — courts have often validated it, albeit reluctantly, acknowledging broad judicial deference to the president on national security matters.

Section 301 investigations: the slow but robust route

Section 301 of the Trade Act of 1974 allows the United States Trade Representative (USTR) to initiate investigations into foreign trade practices that are "unreasonable, unjustifiable, or discriminatory" and to impose retaliatory tariffs after investigation. This process is slower — investigations generally take 6 to 12 months — but it produces tariffs that are more legally sound.

Trump has already signaled that he is "conducting investigations into unfair trade practices" in order to impose tariffs under other authorities. DSTs could be the subject of such an investigation. If it concludes that these taxes are discriminatory — which this administration would inevitably conclude — retaliatory tariffs under Section 301 could be imposed on a legally solid basis. The only question is timing.

Economic consequences: who pays the tariffs?

The reality Trump never mentions: tariffs fall on American consumers

One fundamental economic fact that Trump never mentions in his tariff declarations: it is American consumers who pay the tariffs, not foreign exporters. When a 100% tariff is imposed on German cars, the price of those cars doubles in the American market — American importers pass the tariff on to the sale price. German manufacturers lose American sales. But Americans who wanted a Mercedes or Volkswagen pay much more or go without.

Economic studies on Trump's 2018-2019 tariffs are consistent: tariffs cost American households an average of several hundred dollars per year through higher prices. Protected industries benefited from some tariffs in the short term — American steel, protected from imports, saw its prices rise — but industries that use steel (automobiles, construction) saw their production costs increase in turn.

The impact on Europe: asymmetry of vulnerabilities

European vulnerabilities to American tariffs are not uniform. Germany — whose economy depends heavily on automotive and industrial exports to the USA — would be the hardest hit by general tariffs on European goods. France, less dependent on industrial exports to the USA, would be less exposed. Ireland, which hosts the European headquarters of GAFA and benefits from their favorable tax arrangements, is in a particularly delicate position: the DSTs that some member states want to impose threaten Irish tax attractiveness and may generate intra-European friction.

These asymmetries are exactly what the Trump administration is trying to exploit. A threat targeted at German exports will put Berlin under pressure to defend its industrial interests rather than European commercial solidarity. The "divide and conquer" tactic is as old as diplomacy — and Trump practices it with natural instinct.

The impact on the global digital economy

The internet as battleground of the trade war

The confrontation over digital taxes reveals a deeper reality: the global digital economy lacks an adequate international governance framework. The major American platforms operate globally, but taxation remains national. User data crosses borders, but regulation remains fragmented. Digital advertising markets are global, but competition rules are local.

This regulatory vacuum is what DSTs attempt, imperfectly, to fill from the European side. And this vacuum is what Trump exploits by refusing any multilateral framework that would reduce the freedom of action of American tech giants. The stakes exceed tariffs: it is the question of who governs the global digital economy — an economy worth tens of trillions of dollars that shapes information, opinion, and the daily lives of billions of people.

China as the silent referee

While Washington and Brussels argue over digital taxes, Beijing watches with interest. The US-Europe trade war creates opportunities for China: it can offer European partners Chinese technological alternatives (Huawei, ByteDance, Alibaba) in a context where tensions with the USA are rising. It can propose bilateral trade deals to European countries frustrated by American practices.

Every commercial division between the United States and Europe weakens the West in its competition with China. Every American tariff on European exports is a slap to an ally that should be mobilized in the strategic confrontation with Beijing. Trump knows this — and does it anyway, because his domestic electoral priorities override strategic ally coherence.

US-Europe trade negotiations in 2026: current status

Is a trade deal possible with Trump?

The question every European negotiator is asking in 2026 is simple: can a durable trade deal be struck with Trump? Experience from his first term partly answers: Trump prefers bilateral to multilateral agreements, demands visible and measurable "wins" (reduction of the American trade deficit with a specific partner), and does not hesitate to walk back commitments if his political calculations change.

A US-Europe deal on digital taxes is theoretically possible: Europe suspends its DSTs, the USA suspends its tariff threats, both commit to working on an international framework through the OECD. This is the Canadian deal proposed at European scale. But Europe is larger, more diverse, and some of its members — France, Spain, Italy — have politically invested in DSTs as a fiscal justice measure. Abandoning them without substantial concessions in return would be politically costly.

The timeline matters: 150 days to make a deal

The 150 days of Section 122 create a negotiating window. If Trump wants to extend the 10% tariffs beyond this period without going through Congress, he must find another legal basis — which takes time. If European partners know that current tariffs will soon expire, their urgency to negotiate decreases. And if Trump misses this window, his negotiating position weakens.

But conversely: if Trump succeeds in activating Section 301 investigations that will result in tariffs in 6-12 months, Europe knows the tariff threat is durable. In that case, negotiating now could be preferable to waiting. Global trade politics in 2026 is a real-time poker game in which both parties are trying to calculate each other's bluff.

The impact on European tech companies: a missed opportunity

While the GAFA dominate, European tech companies struggle

A deep irony in the DST debate: Europe has failed to create its own tech giants of GAFA's scale. There is no dominant European search engine, no major European social network, no globally scaled e-commerce platform. This absence of "European digital champions" puts Europe in a defensive posture: taxing what it cannot build.

The reasons for this absence are multiple: markets fragmented by language, regulation that stifles innovation, insufficient venture capital, cultural aversion to entrepreneurial risk. Europe does have tech successes — Spotify, ASML, SAP, Capgemini — but not in the sectors (social networks, search engines, e-commerce) where DSTs create the most tensions with Washington. This structural weakness should push Europe to invest massively in its own digital industry rather than focusing on taxing that of others.

The digital alliance act: a missed opportunity

The trade confrontation over DSTs could have been the occasion to relaunch a US-Europe dialogue on the digital economy: common data protection frameworks, shared AI standards, coordinated taxation of digital multinationals. This is what the EU-US "Trade and Technology Council" (TTC), created in 2021, was supposed to accomplish. Under Trump, this multilateral structure is dormant — replaced by aggressive bilateral threats that build nothing.

A genuine transatlantic digital alliance — setting common competition rules for platforms, common taxation for digital multinationals, and shared cybersecurity standards — would be the adequate strategic response to China's rise in the digital sphere. But it requires a long-term vision that Trumpian trade policy does not permit.

Trump's circumvention strategy: executive power, investigations, bilateral deals

Section 301: the alternative weapon always available

If IEEPA has been reined in by the Supreme Court, Trump has other legal tools to wage his trade war. Section 301 of the Trade Act of 1974 gives the American president the power to impose tariffs against unfair foreign trade practices — without the same constitutional constraints identified in the IEEPA ruling. This route is slower — it requires a prior investigation that can take months — but it is legally more solid. The Trump administration has moreover already announced the opening of Section 301 investigations against several European countries imposing digital services taxes.

For Europe, this means that even if the IEEPA ruling provides partial breathing room, the American trade threat remains intact. It will simply take longer to materialize. And in the meantime, regulatory uncertainty continues to weigh on investment decisions and on the tax planning of technology companies on both sides of the Atlantic.

Bilateral deals as alternative to universal tariffs

Trump favors bilateral logic over multilateral logic. Rather than negotiating universal rules within the OECD or WTO, he prefers country-by-country agreements that give him maximum political leverage. Several countries — including the United Kingdom, Japan, and India — have already begun bilateral negotiations on digital taxation with Washington. If these deals conclude before a common European solution, they risk further fragmenting the EU's common front.

The European Commission is watching these bilateral negotiations with concern. The risk is that member states — under economic or political pressure — accept individual arrangements with Washington that weaken the collective negotiating position of the Union. This is a scenario that Brussels is actively seeking to prevent, but with variable success depending on the capital.

Digital sovereignty stakes: beyond taxation

European technological dependence: a structural reality

The debate over digital taxation masks a deeper challenge: Europe's structural dependence on American technology platforms. Nearly 90% of cloud services used by European businesses are provided by American companies — Amazon Web Services, Microsoft Azure, Google Cloud. This dependence creates a strategic vulnerability that retaliatory tariffs cannot resolve.

The real question is not how much to tax Google or Meta, but how to build credible European alternatives. Initiatives like Gaia-X in cloud computing or efforts to develop a sovereign European AI respond to this logic. But their progress is slow, their resources limited, and American competition fierce. In the meantime, every European company that chooses an AWS service over a European alternative deepens the dependency gap a little further.

Data as the central geopolitical issue

At the heart of the digital trade war lies the question of data. American technology giants collect and process data on hundreds of millions of Europeans — behavioral, economic, health, and communication data. This data constitutes a strategic resource feeding artificial intelligence, advertising targeting, and potentially economic and political intelligence.

The European GDPR attempted to create a protection framework, with partial success. But transatlantic data transfers remain a permanent source of litigation, with recurring court decisions invalidating successive frameworks. Meanwhile, China is building its own closed digital ecosystem — and the United States continues to vacuum global data. Europe is caught between two models of digital capitalism, without yet having imposed its own.

Financial markets facing trade uncertainty: volatility and adaptation strategies

Markets react to every Trump trade statement

Since Trump returned to the White House, financial markets have developed a conditioned reflex: monitor every trade declaration from the administration and adjust accordingly. European stock indexes react immediately to tariff threats — and listed tech companies, on both sides of the Atlantic, are particularly exposed to this volatility. Trading algorithms have even incorporated specific parameters to detect and process Trumpian trade signals.

This sensitivity to political signals creates a particularly difficult investment environment. Long-term investment decisions in the digital sector — which require fiscal and regulatory visibility over 5 to 10 years — become harder when the rules of the game can change in 48 hours based on a post on Truth Social. This uncertainty has a real economic cost, even if it is difficult to quantify precisely.

Tech company adaptation strategies

Faced with trade uncertainty, major technology companies are developing sophisticated adaptation strategies. Meta, Google, and Amazon are investing massively in public relations and lobbying teams in Brussels, Paris, and Berlin to influence European tax decisions. They participate in discussions on OECD solutions while preparing for alternative bilateral regimes. And they are developing corporate structures that minimize their exposure to specific tariff risks.

For mid-sized European technology companies, the margins for maneuver are far more limited. They experience the trade war without being able to influence it. And they frequently find themselves forced to choose between their dependence on American platforms — indispensable to their visibility and sales — and compliance with European fiscal requirements. This vice grip perfectly illustrates the real cost of the absence of European digital sovereignty.

Conclusion: A Trump without IEEPA but never without ideas

The IEEPA decision: rule-of-law victory, not end of the trade war

The IEEPA ruling by the Supreme Court is a victory for the rule of law and American institutional checks and balances. It imposes real constraints on Trumpian trade policy. But it does not end the trade war — it channels it into slower and more transparent legal routes. Trump will continue to threaten, investigate, and activate alternative levers. Europe will continue to defend its digital taxes while dreading retaliation.

The 100% tariff on DST-imposing countries is for now a threat without a clearly identified legal foundation. It can remain a threat — a political pressure instrument rather than a real commercial application. Or it can become reality if a Section 301 investigation concludes. The uncertainty itself is an instrument of economic policy.

What Europe must do

Europe's most effective response to Trumpian trade policy is not to retreat on digital taxes — it is to defend them while offering a credible deal on a global digital taxation framework through the OECD. Signaling to Washington that Europe is ready to negotiate an agreement that protects American tech giants from punitive taxation in exchange for their fair contribution to the public purse. And maintaining credible retaliatory countermeasures so that Trump knows escalation carries a real cost in politically sensitive states.

This is adult commercial diplomacy in a world of commercial populism. Difficult to execute in 27 European capitals. But it is the only response that will work — not capitulation, not uncontrolled escalation, but negotiated resistance with constructive offers.

By Maxime Marquette, columnist

Columnist's transparency note

Position and bias

I am Maxime Marquette. I believe in international trade based on fair multilateral rules. I am critical of Trump's unilateral and coercive trade policy, while acknowledging that some of his criticisms of digital multinational taxation and China's unfair trade practices have a real factual basis. I support digital taxes as a fiscal justice mechanism — provided they are designed within a coordinated international framework. These positions are assumed.

What I do not know

The exact legal basis Trump would use to impose the 100% tariffs on DSTs is not yet clearly defined. The ongoing US-Europe trade negotiations are partially opaque. I do not know what the USTR's legal advisors have said in private about the viability of different legal routes for these tariffs.

Sources

Primary sources

Washington Times — Trump threatens 100% tariff on European nations that impose digital services tax — June 26, 2026

European Parliament — What to expect after the Supreme Court's landmark tariff ruling? — February 24, 2026

Secondary sources

Simon Gros — Europe's strategic turn: the new architecture of European power — June 21, 2026

Chatham House — China sets out its vision for a new global order — June 24, 2026

The Guardian — Xi Jinping and middle powers beyond the United States — June 26, 2026

Foreign Policy — Trade, technology and power rivalry — 2026