The Loophole That Built Shein Wasn't a Loophole. America Drilled the Hole on Purpose.

A $9 dress lands on a Cleveland doorstep three weeks after it was sewn 7,000 miles away, and at no point in that journey did anyone at the border collect a cent of duty, fill out a formal entry, or much examine what was inside. Do that more than a billion times a year and you have not found a clever trick. You have found a law — one the United States wrote on purpose, then watched get used at a scale its authors never imagined. De minimis shipments grew from about 139 million in 2015 to 1.36 billion in 2024, with Customs processing nearly 4 million duty-free parcels a day at peak.² That tenfold surge is the engine under Shein and Temu's prices. It is also, almost entirely, an American invention.

The official story is that Chinese e-commerce discovered a loophole meant for tourists and gifts and hijacked it. Nearly every word of that is wrong. There was no oversight to exploit. Congress raised the threshold deliberately, lobbied by domestic delivery and e-commerce interests, and recast the exemption — across decades — as a consumer benefit. The hole was drilled in Washington. Shein and Temu just walked through it faster than anyone expected.

Washington drilled the hole, on purpose, in 2015

Section 321 dates to 1938, when Congress let tiny parcels skip duty 'to avoid expense and inconvenience to the Government disproportionate to the amount of revenue that would otherwise be collected.'¹ In plain terms: it costs more to collect a dollar of duty on a one-dollar package than the dollar is worth. That was the original logic, and it was sound — for a world of postcards and souvenirs. The number stayed small for decades. Then it didn't. The trade-facilitation act enacted in December 2015, operationally effective in 2016, lifted the duty-free ceiling all the way to $800 per shipment.¹ This was not an accident or a drafting error. The Congressional Research Service is explicit that successive U.S. laws reframed de minimis as a trade-liberalization and consumer-benefit tool — a feature, not a bug.¹ The same paperwork-avoidance logic that justified skipping duty on a one-dollar trinket now justified skipping it on a $799 order. Multiply that by a billion parcels and the paperwork-avoidance principle becomes the largest unmonitored trade lane into the country.

Why $800 per parcel beats one big container

Here is the mechanism every legacy retailer wishes it could undo. A traditional importer — Gap, H&M — buys in bulk, ships full containers across the ocean, clears them through formal customs entry, and pays duty on the lot before a single item reaches a store. Per the House Select Committee on the CCP, Gap paid $700 million in import duties in 2022 and H&M paid $205 million.⁵ Shein and Temu inverted the entire flow. Instead of importing a container and then selling to you, they sell to you first and then import — one order, one parcel, addressed to one shopper, valued at $54 on average and comfortably under the $800 line.⁸ Each box is its own shipment, so each box claims the exemption. The duty owed on a $700 million container is enormous; the duty owed on a $9 dress, shipped solo, is zero. Same clothing, same factories, same ocean — radically different tax treatment, decided entirely by whether the border sees a pallet or a parcel. The price difference your wallet feels is, in large part, that single structural choice.

The scale of the China concentration is where the policy choice and the foreign exploitation meet. From FY2018 to FY2021, 67.4% of de minimis imports by value came from China and Hong Kong, and by 2023 the channel carried roughly a billion parcels worth about $54.5 billion.⁸ A congressional interim report estimated Temu and Shein alone were 'likely responsible for more than 30 percent' of all daily de minimis packages.³ Treat that figure with care — it is an estimate from a single political document, not a Customs-verified count, and the methodology was never published. But even discounted heavily, the direction is unmistakable. A rule written to spare the government the trouble of small change had become the primary on-ramp for a continent's worth of cheap goods.

But didn't they cheat — and didn't it hurt American consumers?

The strongest objection is the one the headlines ran with: Shein and Temu didn't just use a generous rule, they gamed it, paying nothing while honest retailers paid hundreds of millions. The June 2023 congressional report alleged both companies paid no import duties in 2022.³ But that allegation is exactly that — an allegation. Shein publicly disputed it, telling CNBC it paid 'millions of dollars in import duties in both 2022 and 2023,' and Temu said its 'growth does not depend on the de minimis policy.'⁴ No independent audit or Customs data has confirmed the zero-duty claim. The honest read is narrower and more damning to Washington than to Shenzhen: the companies used a legal structure exactly as written. If a $9 dress shipped solo owes no duty, that is not evasion. That is the law working as designed.

And the second objection cuts the other way entirely — that the loophole was bad and ending it is good. Here the cleanest evidence is uncomfortable. An NBER study found that eliminating Section 321 would reduce aggregate U.S. welfare by $11.8 to $14.3 billion, and that the benefit was pro-poor: lower-income ZIP codes were more likely to import de minimis shipments, especially from China.⁶ The cheap parcel was, in measurable dollar terms, a transfer toward the households with the least slack. So 'close the loophole' is not a clean win. It is a choice about who pays — and the people who lose the door price hardest are not the ones who lobbied for the threshold in the first place.

The repeal proves the point better than the rise ever did. It took Congress years and a tenfold surge in volume to notice, and then the executive branch closed the door in two strokes — China and Hong Kong first, then everyone.⁷ No factory moved. No ship changed course. A line was redrawn, and a billion-parcel business model lost the one thing it was actually built on. De minimis was never a loophole China found in America's defenses. It was a door America built, propped open, and then act surprised when the world walked through. The genius of Shein and Temu was never logistics or even price. It was reading a domestic policy document more literally than the people who wrote it.