Trump tariffs kick in as Treasury prepares to collect billions in new revenue for U.S. –U.S. customs agents started enforcing Trump’s baseline 10% tariff at 12:01am on Saturday. | 5 April 2025 | President Trump’s tariffs kicked in as the U.S. Treasury prepares to collect billions in new revenue for the U.S. U.S. customs agents started enforcing Trump’s baseline 10% tariff at U.S. seaports, airports and customs facilities at 12:01am on Saturday. The tariff applies to imports from many countries including China.