The United States Customs and Border Protection has officially begun implementing a 10% additional tariff on imports that are not covered under specific exemptions. The move comes after earlier, higher tariffs imposed by US President Donald Trump were struck down by the US Supreme Court.
According to a US Customs notice, imports will now be subject to “an additional ad valorem rate of 10%,” effective from midnight. The rate is lower than the 15% tariff that Trump had recently indicated would be imposed.
The tariff decision follows a ruling by the US Supreme Court, which declared that the previous tariffs introduced under emergency powers were illegal. In a 6–3 decision, the court said Trump had exceeded his authority by invoking a 1977 law to impose sweeping country-specific duties ranging from 10% to 50%.
In response to the ruling, Trump announced a fresh round of tariffs under Section 122 of the Trade Act of 1974. This provision allows the US President to impose temporary duties for up to 150 days to address large balance-of-payments deficits and broader international payment concerns. Any extension beyond that period would require approval from the US Congress.
Although Trump later signaled that the tariff rate would be raised to 15%, a White House official reportedly indicated that the increase would come at a later stage. However, no formal confirmation has yet been issued.
With the new 10% tariff now in force and earlier duties annulled, global markets and trading partners are closely watching Washington’s next move, as the decision could significantly impact international trade flows and supply chains.