The US has suspended tariff exemptions for small delivery packages valued at $800 or less, ending a loophole that allowed more than one billion packages to enter the US last year without customs duties.

The loophole is due to end on Friday in the US, followed by a six-month transition period to a new tariff regime.

More than 30 countries, including Australia, Germany, Japan and Mexico , have suspended or partially suspended package shipments to the US in advance of the cost change.

Postal unions around the world say more clarity is needed about how the tariff will be calculated before they resume shipments to the US.

Global logistics giant DHL said it would not ship standard business parcels to the US until “unresolved” questions are answered regarding “how and by whom customs duti

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