The ruling is not the receipt.

Two pieces of paper sit side by side. The first is a supplier's quote dated February 10: a housewares item, delivered with duty paid, $12.20 a unit, valid through March 31. The second is the per-unit customs calculation for the same item on a shipment entered this week, revised for the new rules: the duty owed is 50 cents lower than it was. Both documents, and every number on them, are invented for this dispatch. The question they raise is real. The duty at the border just fell. Did the buyer's cost?

On Friday, February 20, the Supreme Court decided Learning Resources, Inc. v. Trump. By six votes to three, it held that the International Emergency Economic Powers Act, the statute behind last year's drug-trafficking tariffs on Canada, Mexico and China and the so-called reciprocal tariffs on imports from all trading partners, does not authorize the President to impose tariffs.¹ The same day the President signed an order ending the additional duties imposed under that law, to stop being collected as soon as practicable, and stating that duties under other laws, including Section 232 and Section 301, are not affected.⁴ He also issued a proclamation under Section 122 of the Trade Act of 1974, which allows a temporary surcharge of up to 15 percent for up to 150 days unless Congress extends it. It imposes a 10 percent duty on most imports entered from 12:01 a.m. eastern time today, February 24, through July 24, with a long list of exceptions.² Last night U.S. Customs and Border Protection issued its instructions for collecting it.³

It would be easy to read that sequence as a price cut. My argument is that a change in the law is an input to a commercial calculation, not a forecast of the next invoice. What changed on February 20, and again today, is the applicable border charge: the duty owed when a particular good, of a particular classification and origin, is entered on a particular date. What a business pays is the buyer's realized purchase cost, and it arrives through entry dates, inventories, contract terms and a separate round of pricing decisions. This is not a claim that savings will never reach buyers, or that suppliers will keep them; some prices will adjust quickly, for reasons this dispatch comes to. Nor did the Court abolish tariffs: most imports now carry a different one, and duties under other laws stand. The claim is narrower. Nobody should book a saving until they have traced the rule through their own goods, dates and contracts.

Who remits and who pays

Start with a distinction that coverage of tariffs tends to blur. A duty is remitted by the importer of record, the party that files the entry and pays Customs. That may be the buyer, if it imports goods itself, or the supplier or its agent, if goods are sold delivered with duty paid, as in the quote above. Who ultimately bears the cost is a separate question, settled not by customs law but by contracts and markets: the importer may absorb it, raise its own price, or press its overseas supplier to share it. Even the dissent in Learning Resources observed that some importers may already have passed tariff costs on to consumers or others.¹ The party that writes the check to Customs is not necessarily the party whose costs fall when the rate does.

In the example, the supplier is the importer. On every unit it enters from today, it remits 50 cents less than it would have under the old rates. The buyer's quote says $12.20 until March 31 and contains no clause adjusting the price for changes in duty. Unless the two parties renegotiate, the border charge has fallen and the buyer's purchase cost has not. That is not necessarily opportunism. The supplier priced its quote against risks that ran in both directions, and it may have absorbed part of earlier increases. It is simply what the contract says.

Change one term

Now change a single word on the quote. Suppose the same item is sold free on board at the foreign port, and the buyer is the importer of record. The 50 cents now lands on the buyer's side of the ledger on the very next entry, without anyone renegotiating anything. Even so, its cost of goods sold does not drop on February 24. The 3,000 units already on the shelf carry the duty that was paid when they came in, and the lower figure reaches margins only as they sell and are replaced. The buyer's cash position improves before its reported margins do.

The two buyers face the same ruling, the same proclamation and the same customs calculation. One sees the change in its cash within days; the other may not see it until a new quote in April, if then. The difference lies entirely in terms that no court and no proclamation touched. That is why a statement such as "our tariff costs just fell" cannot be checked against the news. It can only be checked against the company's own entries, its inventory and its contracts.

Trace one item

To find out what the change means for a particular purchase, follow one item through five questions, in order.

Classification and origin. Does the item fall under the surcharge at all? The proclamation exempts, among other things, certain critical minerals, energy, pharmaceuticals, certain electronics, passenger vehicles and parts, certain aerospace products, goods subject to Section 232 tariffs, and goods entered duty-free from Canada or Mexico under the USMCA.² Customs publishes the exceptions as separate tariff headings; its list of Section 232 goods kept out of the surcharge includes iron and steel, aluminum, semiconductors, copper products and wood products, which remain subject to their own Section 232 duties.³ A 10 percent figure means nothing for a product until its heading has been checked.

Entry date. The new rate applies to goods entered, or withdrawn from a warehouse, for consumption on or after 12:01 a.m. on February 24. Goods already loaded on a vessel and on their final leg before then are exempt if they are entered before February 28.² A shipment that sailed last week and is entered on the 26th is treated differently from one that sails tomorrow.

Other duties. The surcharge is in addition to other duties, except where Section 232 tariffs apply,² and Customs' filing instructions list Section 301 duties alongside it on the same entry line.³ An item that carried a Section 301 duty before the ruling still carries it.

Inventory. Units already on the shelf were bought at the old cost, and that cost has been paid. A business that values inventory at what it cost will see the new rate in its margins only as old stock sells through and new stock replaces it, which may take weeks or months.

Contract. Who is the importer, what does the price include, how long is it valid, and does any clause adjust it for duty changes? The answers decide whether a change at the border becomes a change on the buyer's invoice, and when.

When the saving arrives

Figure 2 puts the example on a calendar. For the border, the important dates are fixed in the documents: February 20 for the ruling and the orders, today for the surcharge, February 28 for the end of the in-transit exception, July 24 for the scheduled end of the surcharge. For the buyer, the important dates are its own: when its stock on hand runs down, when its next shipment is entered, when its quote expires. In the example, the buyer's price does not change before April, when a new quote replaces the old one, and even then only if the negotiation passes the lower duty through. A finance team that booked the saving on February 20 would have been at least six weeks early, and possibly wrong.

The example also compares the new surcharge with one assumed old rate. Actual rates under the IEEPA tariffs varied widely by country and changed repeatedly;¹ for some goods the switch will mean a large reduction, for others little or none, and goods now covered by an exception may owe no surcharge at all. The comparison has to be made product by product, against the rate each product actually paid.

Objections, considered

Some prices will adjust quickly. They will, and it is worth being precise about where. Prices move fastest when purchases are made on the spot rather than under long contracts, when contracts carry explicit clauses passing duty changes through, when an importer competes with rivals who face the same lower duty and buyers can see it, and when little inventory stands between the border and the shelf. A buyer in that position may see lower prices within weeks. A buyer with a fixed-price quote, a full warehouse and a single supplier will not, at least until the next negotiation. Neither case is the universal one, and that is the point: the speed of pass-through is a property of the market and the contract, not of the ruling.

The rules will change again anyway. Possibly. The surcharge is temporary by law, limited to 150 days unless Congress extends it, and the proclamation sets its end at July 24.² Other changes may follow. That makes it more important, not less, to date every estimate and tie it to the documents in force when it was made. An estimate that says "lower duty" without a date and a legal basis will be wrong the next time the rules move.

Refunds will settle it. This dispatch makes no prediction about refunds of duties already paid under the IEEPA tariffs, which remain to be worked out; Justice Kavanaugh's dissent warned that the refund process was likely to be a "mess."¹ Even where refunds are paid, they would go to the importers who paid the duties, which again need not be the parties who bore the cost.

The ruling changes what is owed at the border; only your own goods, dates and contracts can say what changes on the invoice.

Reconcile one category

• Pick one material purchase category. One that matters to margins, with a known supplier and a known contract.
• Find the legally effective rate. The headings and exceptions that apply to it on its actual entry dates, from the documents in force.
• Check the actual entries. What was entered, when, and what Customs was paid or will be.
• Read the supplier quote. Who imports, what the price includes, when it expires, and whether it adjusts for duty.
• Estimate the cash impact, with a date. When, if ever, the change reaches what you pay, and on what assumptions.

Back to the two documents. The customs calculation is correct: on entries from today, this item's border charge is 50 cents lower. The quote is correct too: the buyer will pay $12.20 a unit until the end of March. Neither document is wrong, and neither by itself tells the buyer what it will pay. That answer belongs on a third document nobody has written yet, the reconciliation that puts the rule, the entry, the inventory and the contract on one page, with a date at the top.