Trump Invokes Trade Act Section 122 for 10% Replacement Tariff — The Structural Meaning of a "150-Day Time Bomb"

Why it matters: The day after the Supreme Court ruled the IEEPA tariffs unconstitutional by a 6-3 vote, Trump imposed a 10% uniform tariff under Section 122 of the Trade Act (1974 Trade Act). However, this law only allows for a maximum of 150 days of "temporary import surtax" and does not allow for the setting of discriminatory tax rates by country. In other words, Trump's tariff policy has been downgraded from a "permanent trade strategy" to a "150-day emergency measure." This structural change fundamentally reorganizes the dynamics of the three branches of government over the president's trade authority.

📝 Summary: After the Supreme Court ruled the IEEPA tariffs unconstitutional, Trump immediately invoked a 10% global uniform tariff under Section 122 of the Trade Act, but this law has a maximum term of 150 days and will expire in late July 2026 without congressional approval—this is not a "tariff victory" but the beginning of a "150-day grace period."

What Happened

• Invocation of Section 122 of the Trade Act — On the day of the Supreme Court ruling (February 20), Trump signed an executive order based on Section 122 of the Trade Act, imposing a "10% surcharge on normal tariffs." It was announced that it would take effect at 0:01 a.m. on February 24. The law allows for a temporary import surcharge of up to 15% for a maximum of 150 days to address the international balance of payments deficit, but requires congressional approval for extension.
• Decisive difference from IEEPA tariffs — The IEEPA tariffs, which the Supreme Court ruled unconstitutional, could set tax rates by country, such as 34% for China and 25% for Canada and Mexico. Section 122 only allows for uniform taxation, making "punitive" high tariffs on China impossible. Furthermore, the risk of lawsuits for the return of $134 billion in tariffs collected by December 2025 has emerged.
• Remaining and eliminated tariffs — Sections 232 (steel/aluminum 50%, based on national security) and 301 (countering IP infringement against China, 7.5-25%) are not subject to the Supreme Court ruling and remain valid. What disappeared was the entire "Liberation Day" tariff package based on IEEPA and additional tariffs in the name of fentanyl.

The Big Picture

Historical Context

The President's tariff authority has been the focus of constitutional struggles since the founding of the United States. Article 1, Section 8 of the U.S. Constitution clearly vests the power to "lay and collect taxes" in Congress. However, since the 20th century, Congress has delegated tariff authority to the President through several laws. Understanding this history is key to understanding the meaning of this "escape to Section 122."

The Smoot-Hawley Tariff Act of 1930, in which Congress directly set tariff rates on more than 20,000 items, is remembered as a lesson that deepened the Great Depression. From this failure, Congress shifted to delegating tariff negotiation authority to the President after the Reciprocal Trade Agreements Act of 1934.

Section 232 of the Trade Expansion Act of 1962 granted the President tariff authority on the grounds of "national security." The Trade Act of 1974 provided the President with several tariff tools: Section 122 (temporary response to international balance of payments deficit), Section 201 (safeguards), and Section 301 (countering unfair trade practices). And the IEEPA of 1977 gave emergency powers against "unusual and extraordinary threats."

During Trump's first term (2017-2021), these tools were actively used. Section 232 tariffs on steel and aluminum, and Section 301 tariffs as a countermeasure against IP infringement by China. However, the use of IEEPA for "Liberation Day" tariffs in the second term was an unprecedented expansion of interpretation that defined "trade deficit itself" as an emergency, not security or unfair trade. Chief Justice Roberts of the Supreme Court called this a "transformative expansion of authority over the President's tariff policy" and rejected it by applying the major questions doctrine.

This switch to Section 122 clearly shows the "hierarchy" of tariff tools available to the President. The most powerful and flexible IEEPA (no restrictions) became unusable, and the next best option, Section 122 (15% limit, 150-day limit, uniform taxation), was used. The remaining options are Section 301 (several months for investigation) and Section 338 (countering discriminatory trade practices, 50% limit), but neither matches the freedom of IEEPA.

Stakeholder Map

By the Numbers

• 10% — Alternative tariff rate based on Section 122 of the Trade Act. What was 34% for China and 25% for Canada under IEEPA has been "downgraded" to a uniform 10%.
• 150 days — The maximum period allowed by Section 122. If it takes effect on February 24, the deadline will be around July 24. Congressional approval is required for extension.
• 15% — The upper limit of the tariff rate allowed by Section 122. Trump chose 10%, but there is room for an additional 5%.
• $134 billion — The amount collected as IEEPA tariffs as of December 2025. Because the Supreme Court ruled it unconstitutional, there is a risk of lawsuits for refunds by more than 300,000 importers.
• $1.5 trillion — Expected revenue over 10 years if IEEPA tariffs are maintained. The disappearance of this source of funds fundamentally collapses the funding structure of the Republican tax cut bill.
• +0.69% — S&P 500 increase rate on the day of the ruling. The market welcomed the abolition of tariffs, but the increase was limited.
• 34%→10% — Change in tariff rate for China. With the elimination of IEEPA tariffs (34%) and replacement with Section 122 (10%), China is the biggest beneficiary.

Between the Lines — What Reports Don't Say

The media is reporting that "Trump immediately imposed alternative tariffs" as a quick response, but that's not the real story. The 10% uniform tariff under Section 122 is not a "replacement" for the IEEPA's country-specific discriminatory tariffs, but a "degraded version." China enjoys a substantial real tax cut from 34% to 10%, and Canada and Mexico also fall from 25% to 10%. In other words, the biggest beneficiary of the Supreme Court ruling is China, and the structure is such that the party Trump wanted to punish the most benefits the most. Furthermore, Section 122 is based on the "international balance of payments deficit," but it remains questionable whether the U.S. international balance of payments deficit, which is about 3% of GDP, can be said to be "large and serious" from a historical perspective, and this alternative tariff itself may be legally vulnerable. The reason why the Trump administration does not mention this contradiction is a political judgment that "it is better than doing nothing," and it shows that political messaging is prioritized over the rationality of trade policy.

NOW PATTERN

Imperial Overreach × Path Dependency

Trump, who lost the "omnipotent tariff tool" of IEEPA in the Supreme Court ruling, has been forced into "a weak substitute with a time limit" called Section 122, and the leadership of tariff policy is structurally shifting from the President to Congress.

Imperial Overreach: "Legal loopholes" are not infinite——Downgrade in the name of Section 122

Trump pulled out Section 122 the day after losing IEEPA, but this is not the beginning of a "victory" but a "retreat."

Let's be frank. Switching to Section 122 of the Trade Act is like a person wearing a high-end suit suddenly changing into a jersey. It looks like "still wearing clothes," but the rank is completely different.

IEEPA was a tariff "Swiss Army Knife" for the President. Tax rates can be changed by country. There is no time limit. There is no upper limit. By declaring a "national emergency," tariffs could be imposed as much as desired without congressional approval. It is thanks to IEEPA that "tailor-made punishments" such as 34% for China, 25% for Canada, and 30% for Mexico were possible.

Section 122 is the exact opposite. First, the tax rate is up to 15%. Trump chose 10%, so there is room for an additional 5%, but it is far from IEEPA's 34%. Next, country-specific discriminatory tax rates cannot be set. Only uniform taxation. This fundamentally undermines the core message of Trump's trade policy of "punishing China." While tariffs on China have fallen from 34% to 10%, the same 10% is imposed on allies such as the EU, Japan, and South Korea. A tariff tool that cannot distinguish between enemies and allies is a blunt sword as a weapon of trade diplomacy.

And the biggest constraint is the 150-day deadline. If it takes effect on February 24, the deadline will be around July 24. Congressional approval is required for extension, but within the Republican Party, Senator Rand Paul welcomes the ruling, saying that "tariff authority is in Congress," while Representative Buddy Carter is reacting against "judicial overreach." Senator McConnell developed the principle that "the role of Congress in trade policy is not an inconvenience to be avoided."

There is little prospect that this division will be resolved within 150 days. In other words, Section 122 has not "continued tariffs" but has confirmed "the tariff cliff after 150 days." As the deadline approaches, companies will accelerate inventory buildup and supply chain reorganization, and market volatility will increase. Trump has not succeeded in a "legal detour," but has been forced into a "provisional measure with a countdown."

Furthermore, what cannot be overlooked is legal vulnerability. Section 122 is based on a "large and serious international balance of payments deficit," but it is debatable whether the U.S. current account deficit (about 3% of GDP) meets this standard. It is not impossible that this alternative tariff will also be contested in court, following in the footsteps of IEEPA.

Path Dependency: Leadership of tariffs from the President to Congress——Power shift approaching the "July cliff"

The 150-day deadline is a countdown to the "forced transfer" of decision-making power over trade policy from the President's hands to Congress.

This is the deepest structural meaning of this ruling. For the past few decades, Congress has dumped trade policy on the President. Detailed technical judgments on tariffs are politically risky for legislators with little return——constituents in the electoral district welcome cheap imports, but local manufacturers seek protection. By pushing this "tariff dilemma" onto the President, Congress has avoided responsibility.

The Supreme Court ruling forcibly ended this "structure of avoiding responsibility." With the inability to use the omnipotent tool of IEEPA, Trump must go through Congress if he seeks permanent tariffs