WASHINGTON — President Donald Trump has paused imposing tariffs on small-value packages arriving from China, apparently to give federal agencies time to sort out how to process millions of such shipments that have come through the U.S. border every day without paying taxes.

The executive order, dated Wednesday, didn’t say when the pause would end but said it would cease when the Department of Commerce could put in place “adequate systems” to “fully and expediently process and collect tariff revenue.”

“It’s just showing we’re moving fast, and the implications are not fully understood when some of these regulations are put in place,” said John Lash, group vice president of product strategy at the supply chain platform e2open, pointing out that Trump’s order affected huge numbers of small packages, many in transit.

“The volumes are absolutely incredible,” Lash said. “And all of a sudden, they go from not requiring filing (for tariffs) … to actually requiring full filing, which is a complicated task.”

Ending tariff exemptions on low-cost packages from China has broad bipartisan support in Washington, and Trump pulled the plug when he raised tariffs on Chinese goods by 10% earlier this week. Goods sent through duty-free packages became subject not only to existing tariffs — 25% for many Chinese products — but also the new 10%.

It marks another pause on Trump’s policies weeks into his second administration, including orders to impose tariffs on Mexico and Canada that were suspended after the two allies took steps to appease his concerns about border security and drug trafficking.

The U.S. Postal Service, which would be burdened with collecting tariffs on small packages, on Tuesday announced it would not accept parcels from mainland China and Hong Kong, only to reverse the decision the next day. It said it would work with Customs and Border Protection to implement a collection process for the new tariffs.

“It’s one of those things where you put in any change so quickly it catches people unprepared,” Lash said.

Introduced in 1938, the so-called de minimis exception was intended to facilitate the flow of small packages valued at no more than $5, the equivalent of about $106 today. The threshold increased to $200 in 1994 and $800 in 2016. But the rapid rise of cross-border e-commerce, driven by China, has challenged the intent of the decades-old customs exception rule.

Chinese exports of low-value packages soared to $66 billion in 2023, up from $5.3 billion in 2018, according to a report released last week by the Congressional Research Service. And the U.S. market has been a major destination.

In 2023, for the first time, more than 1 billion such packages came through U.S. customs, up from 134 million in 2015. By the end of last year, Customs and Border Protection said it was processing about 4 million small shipments a day, many of which came from China through online retail platforms such as Shein and Temu.

Critics said the practice had allowed not only tariff evasion, but also the flow of unsafe products such as counterfeits and illicit drugs into the U.S. Supporters argued that it helped keep prices affordable for U.S. consumers and small businesses.

After Trump threw out the exemption, some analysts noted that the policy shift could lead to higher prices and delivery delays as U.S. customs officials cope with an onslaught of packages to scrutinize.

“We are talking about millions of packages every week that currently just basically get treated like domestic shipping,” said Neil Saunders, a managing director with research firm GlobalData.

He said Temu has already adjusted by increasing its warehousing capabilities in the U.S. during the past year and shipping products in containers.

Lash said the end to the de minimis exception rule would change the cross-border e-commerce model when tariffs and filing paperwork drive up costs, prompting overseas sellers to turn to bulk shipping.

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Hadero reported from South Bend, Indiana.