Tariff pass-through is the share of an import duty that ends up in the price a consumer pays. The duty is charged once, at the border, to the importer. What happens next depends on contracts, competition, and margins: some of the cost reaches the shelf quickly, some is absorbed by businesses, and some never shows up at all.
The starting point is mechanical. U.S. Customs and Border Protection collects the tariff from the company importing the goods, typically within 10 days of the shipment clearing customs, as GovFacts explains in its primer on how tariffs work. That importer is the legal payer. It is not automatically the economic payer.
This piece traces the path a duty takes from the port to the register, and why the same tariff can land differently in different sectors. It draws on current 2026 duty rates to show how large the border cost can be before pass-through even begins.
What exactly is a tariff, and who pays it at the border?
A tariff is a tax a government places on goods entering the country; trade documents use the terms tariff, duty, and customs duty interchangeably. In the United States, the importing company pays it. The foreign seller still receives its agreed price. Think of it as a wedge: on a $100 product facing a 25% duty, the buyer pays $125 and the seller still gets $100, with the $25 going to the government.
Most duties are ad valorem, meaning a percentage of the good's value. Others are specific, a fixed fee per unit or weight. GovFacts cites the U.S. charge of $0.51 on every imported wristwatch, whether the watch costs $40 or $5,000. A compound tariff combines both, such as footwear duties of 5% of value plus $1 per pair. The method matters for pass-through: a percentage duty scales with price, while a fixed fee takes a bigger relative bite out of a cheap item than an expensive one.
How large is the duty stack at the port in 2026?
The amount available to pass through is rarely one headline rate. According to the US Tariff Tracker 2026, a shipment's current U.S. duty is a stack: the base Harmonized Tariff Schedule rate plus every applicable Chapter 99 measure, such as Section 301 or Section 232 actions. Which layers apply depends on the 10-digit product code, the country of origin, the entry date, and any exclusions.
The stack can be steep. As of late 2026, the tracker lists Section 301 duties on China-origin goods at 7.5% to 100% across roughly 25,000 HTS codes, with electric vehicles at 100% and semiconductors at 50%. Section 232 duties on steel, aluminum, and copper sit at 50% effective April 6, 2026, applying regardless of origin. A worked example from the tracker: Chinese steel rebar faces no base duty, plus 25% under Section 301 and 50% under Section 232, for a 75% effective rate before fees. We covered a connected angle in Section 1071 Small-Business Lending Rule: What Lenders Must Track.
Timing matters as much as size. The tracker notes that a 10% global surcharge imposed under Section 122 of the Trade Act of 1974 expired by operation of law on July 24, 2026, after hitting its 150-day statutory maximum. Liability turned on the entry date: goods entered before the cutoff owed the surcharge; goods entered on or after it owed nothing. Importers pricing goods in that window were passing through a duty that later entries no longer carried.
What happens between the port and the shelf?
Once the importer pays Customs, the cost moves through a chain. Each link decides, in effect, how much of it to pass on.
- The importer. The duty hits the importer's landed cost: the product price plus freight, insurance, fees, and now the duty. The importer can raise its wholesale price, renegotiate with the supplier, switch sourcing, or absorb the cost out of margin.
- The wholesaler or distributor. If the importer's price rises, distributors decide whether to mark up in step or compress their own margins. Long-term contracts can delay the change; spot-market goods repriced fastest.
- The retailer. Retailers set shelf prices. In competitive categories, a retailer may hold the old price and take the hit to keep customers. In categories with few substitutes, the duty is more likely to appear in full.
- The consumer. What reaches the register is the residual: the pass-through share.
At every step, the duty is a cost, but the decision to pass it on is a business judgment. That is why the border charge and the shelf price are not the same number.
Why does pass-through vary so much by sector?
Several factors, all visible in the structure of the duty stack itself, explain the differences.
- Competition and substitutes. If a domestic or third-country alternative exists at a similar price, a retailer cannot raise prices much without losing sales. The importer absorbs more. Where the tariffed good dominates, the price moves.
- Margin structure. Thin-margin sectors, such as grocery and general merchandise, have little room to absorb a duty. High-margin goods can swallow part of it.
- Share of the final price. A 10% duty on a component that is a small slice of a finished product's cost becomes a small slice of a small slice. A 50% Section 232 duty on the steel in a visible product is harder to hide.
- Contract timing. Importers on fixed-price contracts eat the duty until renewal. Retailers on promotional calendars may delay repricing for months.
- Which duty applies. Because duties stack by product code and origin, two retailers selling similar goods can face very different border costs. The tracker's apparel example, a $10,000 woven apparel shipment facing a 5.5% base duty plus 25% under Section 301, shows a 30.5% combined rate on one product category while others carry far less.
What this means for readers: the same tariff action can show up as a noticeable price move in one aisle and almost nothing in another, and both outcomes are consistent with the same policy.
Our analysis: the payer at the border is not always the payer in the end
The legal design of tariffs makes the importer the payer of record. The economic design leaves the split to markets. GovFacts frames this as the core debate over who really pays for tariffs: the immediate effect is a higher cost for the American buyer, but how much of that cost reaches consumers depends on the pricing power at each link in the chain. The 2026 duty stack adds a wrinkle: because layers stack and expire on statutory schedules, the border cost on an identical product can change within a single quarter. A shelf price set in February under a 10% surcharge may sit beside a competitor's price set in August, after that surcharge expired on July 24.
Readers tracking a specific product should start with the code, not the headline. The tracker's own guidance is to identify the relevant program, confirm the HTS code, review the country of origin, and estimate the landed-cost effect before drawing conclusions about a shipment or a price. The refund question adds a further layer for importers who paid duties later invalidated in court; our earlier coverage of the tariff ruling follows that litigation and what it makes possible for refunds. For related coverage, see Six Months After the Tariff Ruling, the Refund Question Runs On.
What remains unknown about pass-through?
The evidence here establishes the mechanics: who pays at the border, how duties stack, and the structural reasons pass-through differs by sector. It does not establish a single economy-wide pass-through rate, and none should be inferred from the sources above. Sector-specific estimates require firm-level price data that this pack does not supply. What is known is the direction of the mechanism and the size of the border cost in 2026. What is not known, from these documents, is precisely how much of any given duty has reached the shelf, and how fast.
