Agency is not the suffix here. It is the operative word.

Start where the duty comes from. Section 1673 of Title 19 says that if the administering authority determines that foreign merchandise is being sold in the United States at less than its fair value, and the Commission determines that a domestic industry is materially injured, then an antidumping duty shall be imposed. The administering authority is the Secretary of Commerce and the Commission is the International Trade Commission, both by statutory definition. Two independent agencies, and either one of them can end the case by itself. The countervailing statute is not parallel, which almost every summary of this gets wrong: for merchandise from a country that is not a Subsidies Agreement country, section 1671(c)(1) says no determination by the Commission shall be required at all.¹

Move to the two statutes people actually argue about and the answer to who decides changes each time. Under section 232 the Secretary of Commerce investigates, through the Bureau of Industry and Security, and reports within 270 days; the President then has 90 days to determine whether he concurs and what action to take, and a separate 15 days to implement it, with a written statement of reasons to Congress within 30 days of the determination. The ninety-day clock is the one everyone quotes and it governs a decision, not an imposition.² Under section 201 the Commission decides within 120 days, or 180 if critical circumstances were alleged, or 150 if it determined before the hundredth day that the investigation is extraordinarily complicated, or 210 if both, and its report to the President runs on a second clock entirely.³ Under section 301 there is no presidential decision step in the text at all: the grant runs to the Trade Representative, who shall take action subject to the specific direction of the President if any is given.⁴

The document at the center of all of it has four authorities and no single owner. The Commission compiles and publishes the Harmonized Tariff Schedule. Its provisions are statutory provisions of law for all purposes. It is not published in the United States Code. And a customs ruling letter, not anything the Commission issues, is the thing that binds. The Commission says so itself, in a disclaimer on its own tariff pages: Customs and Border Protection is solely authorized to interpret the schedule and to issue legally binding rulings on classification.⁵

Then there is the other layer, the one the category talks about constantly without a regulation to point at. Partner Government Agency is Customs and Border Protection's own phrase, used across its preambles, its guidance and its system documentation. A full-text search of the current Code of Federal Regulations returns one hit for it, in a Consumer Product Safety Commission rule, and only inside the title of a Customs implementation guide. The plural form returns nothing. Title 19, where every customs regulation lives, does not contain the phrase at all; it says other Government agencies, twenty-three times.⁶ The agencies themselves are real enough, and Customs names them: five at Agriculture, six at Commerce, three at Homeland Security, eight at Transportation, four at Treasury, and nine more that report to nobody.⁷ An executive order signed in February 2014 required all of them to use one electronic window by December 31, 2016, and the statute behind it is older than usually credited, having been added by the SAFE Port Act of 2006 rather than by the trade facilitation act named for 2015 and enacted in 2016.⁸ What happens after that is five clauses long: appraise, classify, fix the amount, liquidate, give notice.⁹ And what happens when someone disagrees goes to one court with exclusive jurisdiction, whose filings rose sixteen percent in fiscal 2025 to 292.¹⁰

Now the second meaning, which is also the law. The regulation governing the transaction of customs business on another party's behalf prints its own model form, and its operative sentence appoints the holder a true and lawful agent and attorney with full power and authority to do every lawful act, without limitation of any kind, as fully as the principal could do if present and acting.¹¹ The entry statute uses the same word: one of the parties qualifying as importer of record, either in person or by an agent authorized by the party in writing, shall make entry.¹² Three things widely said about that instrument are wrong on the face of the regulations. It is not filed with the agency. It does not expire in two years unless a partnership issued it. It is revocable at any time by written notice.¹³

Here is what argues against the whole premise, published on the page selling it. Nobody can count the agencies. The Administrative Conference of the United States, whose job is studying them, states in print that there is no authoritative list of government agencies and that every list in government publications is different, and then reports 118 from one federal source, 305 from a second and more than 600 from a third; the Federal Register's own registry returns 472 records, which is the largest figure and the least trustworthy, because it still carries agencies abolished in the 1990s.¹⁴ The single-window count has the same problem in miniature: two federal agencies say 47, the agency that runs the system says more than 47, and it has not restated the figure since 2018.¹⁵ Commerce prints an address in its own duty orders where readers can find the list of orders currently in effect, and that address resolves to a form for requesting duty-free entry of scientific instruments; the Commission's own orders-in-place file opens with the words AS OF NOVEMBER 03, 2014. So this page prints a flow rather than a stock: 39 antidumping orders and 13 countervailing orders issued in 2024, which is dated and sourced.¹⁶

One last item, because it is the clearest evidence of what this market actually consists of. Customs and Border Protection cites the executive order behind the single window to page 10655 of volume 79 of the Federal Register. The order begins on page 10657. Nineteen federal documents carry the wrong page and every one of them is that agency's, the most recent published in August 2026, while twenty-five documents from seven other agencies carry the right one, as does the Federal Register's own metadata and the printing office's page range.¹⁷ The same agency's published table of duties, taxes and fees collected stops at fiscal 2022, which is why no later collection figure appears anywhere on this page.¹⁸ The primary sources in this field disagree with each other constantly. Somebody has to read them, and that is the business this name is for.