McCown: U.S. Container Imports Face Historic Decline as Tariff Effects Take Hold

The U.S. container shipping industry is heading toward what could be one of the most significant volume declines in its six-decade history, according to the latest analysis from shipping expert John McCown.

August data revealed only a slight 0.1% year-over-year increase in inbound container volume at the ten largest U.S. ports, following a temporary reprieve in July when volumes rose 3.2%. Meanwhile, outbound volume in August dropped 2.6%, continuing an erratic pattern that saw a 2.0% increase in July and a 1.7% decrease in June.

The marginal growth in August inbound volumes can be attributed to an exception for goods in transit after the August 7 implementation of revised reciprocal tariffs. “The new tariffs did not apply to containers that were loaded on vessels at their last foreign port of call before August 7 provided they entered the U.S. before October 5,” McCown explains.

This exemption artificially supported August figures, as “the large majority of boxes coming into the U.S. in August being exempt from the tariffs going into effect on August 7.” McCown adds that this mechanism may have even incentivized strategic deployment adjustments where “ships were loaded by August 7 and slow-steamed to the U.S.”

A stark contrast is emerging between U.S. container volumes and global shipping trends. “When U.S. container volume data is compared to global data and data in other major areas, there is a noticeable and widening gap as the downtrends in U.S. lanes are being significantly mitigated by increased volume in other areas,” notes McCown.

Evidence of this divergence can be seen in Far East export figures, which “set a new record and were 6.3% ahead of the same month last year” in July. McCown observes that “world container supply chains have already begun to adapt and reconfigure trading patterns. The U.S. is a less relevant player in world trade today than it was prior to these various tariff initiatives and will become more so as announced plans are implemented.”

The National Retail Federation has revised its projection for 2025, now expecting total inbound volume to decrease by 3.4%. When considering that year-to-date volume through August shows a 3.1% increase, this projection translates to “the remaining four months of 2025 being down 15.7% compared to the same four months in 2024.”

September will likely mark the beginning of more pronounced declines. In a September 17 presentation, the Port of Los Angeles director stated they expected inbound volume to drop 10% compared to the same month last year. Container bookings data supports this outlook, with bookings from China to the U.S. down 26% in the first week of September compared to the same period last year.

The situation could worsen if currently paused reciprocal tariffs on Chinese imports are implemented in mid-November. “If and when those tariffs are implemented, it is highly likely that they would lead to broader declines related to inbound containers to the U.S. from China,” McCown warns.

Adding another layer of complexity is the upcoming USTR ship fee plan targeting ships built in China or operated by Chinese carriers, set to take effect in mid-October. McCown describes this as “moving container volume related to trade lanes involving the U.S. into unchartered waters.” As these lanes account for more than a quarter of global container miles, “there will be a ripple effect that will be felt globally.”

The projected decline represents an unprecedented shift for an industry that has historically grown at rates exceeding U.S. GDP. “For a tangible metric that has consistently for decades grown above U.S GDP, most often at two, three or even more multiples of GDP, the unusual nature of an actual decline in inbound container volume into the U.S. cannot be overemphasized,” McCown states.

While the immediate volume impact is becoming clearer, the inflationary effects of the tariffs will take longer to manifest fully in economic data. McCown notes that “it will not be until at least when the inflation data is released in during the fourth quarter that the inflationary impact of the tariffs can begin to be accurately assessed.”

McCown concludes that the U.S. faces a difficult trade-off: “The more inbound container volume to the U.S. declines, the more commerce and growth will be impacted but the less inflation we will get. The less inbound container volume to the U.S. declines, the more inflation we will get but the less commerce and growth will be impacted. Unfortunately, there is simply no good place to be on that spectrum.”

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