Lumber imports are slated to face higher tariffs after October 14. BROWN / AFP/FileSource: AFPUS President Donald Trump on Monday set a slate of tariffs for lumber imports to go into effect October 14. In a proclamation, the White House imposed a "10 percent global tariff on imports of softwood lumber." It also set "a 25 percent global tariff on upholstered furniture, which will increase to 30 percent on January 1." The US Supreme Court is due to hear oral arguments on the legality of Trump's global duties on November 5.