Second copper-related proclamation lowers the US-melted threshold to 85% from June 8

On June 1, 2026 the President signed a follow-on proclamation adjusting Section 232 tariffs on aluminum, steel and copper, with changes effective 12:01 a.m. ET on June 8, 2026. For copper, the main change is a lower US-origin threshold for entirely made products, from 95% to 85%. The proclamation mostly targets downstream machinery and equipment rather than refined copper.

• Signed June 1, 2026; changes effective 12:01 a.m. ET on June 8, 2026
• US-origin threshold for entirely made products lowered to 85% from 95%
• Main rate changes cover downstream machinery and equipment, not refined cathode