The news: The US Postal Service will impose its first fuel surcharge on packages, an 8% fee that takes effect April 26 and expires on January 17, 2027, per The Wall Street Journal. The surcharge applies to packages but not letter mail, as the agency looks to stabilize its finances after posting multibillion-dollar losses in nine of the past 10 years, including a $9 billion net loss in fiscal 2025.

Why this matters: The surcharge could help the agency combat rapidly rising gas prices, which are up 33% MoM, per AAA. But it also comes as Amazon, its largest customer, is reportedly considering significantly reducing the volume of packages it ships through USPS.

USPS’ share of parcel volumes fell to 27.6% last year from 30.3% a year earlier, per ShipMatrix. That trendline is likely to continue in the years to come.

Implications for retailers: In the not-unlikely scenario that the Postal Service’s fuel surcharges persist beyond their current end date and Amazon pulls back volume, USPS could enter a downward spiral. The agency has invested heavily in parcel infrastructure as traditional mail volumes have declined, leaving its network dependent on scale to stay efficient. Losing a large share of Amazon's shipments would leave USPS with high fixed costs and lower utilization, likely leading to further rate increases or service cuts, which could push even more volume away.

The result could be fewer affordable shipping options for smaller merchants. Some may decide to absorb higher costs by shifting volume to UPS or FedEx. Others may turn to Amazon's logistics network, deepening their dependence on a direct competitor at a time when Amazon, Walmart, and other large players are raising the bar on delivery speed and reliability. For retailers already squeezed by rising shipping costs and tariff uncertainty, the window to diversify fulfillment strategies is narrowing.

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