What a tariff schedule actually is

A tariff schedule is a book of goods. Every article that can lawfully cross a border has a place in it, each place has a code, and the code carries the duty. Nothing in the book is organised by industry, by company or by policy objective. It is organised by what a thing is, which is why the fights about tariffs are so often fights about classification rather than about rates.

The structure runs from the general to the particular: broad chapters covering a family of goods, headings inside them, and subheadings inside those. The opening digits of every code are internationally common, agreed through the Harmonized System so that customs authorities in different countries are describing the same article. The digits after them are national, and that is where a country's own distinctions live. Two products that look identical to a shopper can sit in different subheadings and carry different rates.

How a rate gets found

Three separate determinations decide what an importer pays, and each is a distinct legal question.

1. Classification: which line the article falls on, settled by rules of interpretation and, where a trader wants certainty in advance, by a binding ruling from the customs authority.
2. Origin: which country the article is treated as coming from, which turns on where it was substantially transformed rather than where it was last loaded.
3. Valuation: the sum the percentage is applied to, normally the transaction value, though some lines carry a fixed charge per unit of weight or quantity instead.

A schedule also has columns. One set of rates applies generally, another applies to partners with which a country has an agreement, and a separate column exists for countries that do not hold normal trading relations. The same line can therefore carry several rates at once, and a good's route into the country decides which one it meets.

Two taxonomies of the same object

The chart above counts output. It groups establishments by what they mainly make, which is how production statistics have to work if factories are to be counted once. A tariff schedule does something else: it classifies an article at the moment it presents itself at a border, whatever was made where.

That gap is the source of a persistent public confusion. A duty on a semiconductor line applies to chips that arrive as chips. A chip that arrives inside a finished laptop crosses the border as a laptop and is classified as one. The component never meets the rate written against its own name. This is also why coverage arguments over a tariff are arguments about which lines were listed, not about which industries were named in the announcement.

Economists disagree about who ends up paying, and the disagreement is specific rather than ideological. The importer of record remits the duty; the question is how much of it is passed forward into consumer prices, absorbed by the exporter through a lower price, or absorbed by margins along the way. Studies reach different answers for different goods and different periods, because the split depends on how easily buyers can switch suppliers and how concentrated the exporting market is.

So when a tariff is announced, do not ask what it does to an industry. Ask which lines are listed, which column the goods will enter under, what origin rule applies, and whether the article in question typically arrives on its own or already installed inside something larger. Those four answers determine almost everything. The headline rate determines much less than it appears to.