A coalition of trade associations expresses strong support for prompt and decisive U.S. action in response to Canada’s plans to implement a three percent digital services tax (DST), departing from international consensus. The letter urges the U.S. Trade Representative (USTR) to initiate a Section 301 investigation under the Trade Act of 1974 upon the passage of Canada’s DST legislation. The letter outlines concerns about the discriminatory nature of the tax, its retroactive application, and potential conflicts with trade commitments. Emphasis is placed on the urgency of U.S. action to prevent undermining progress in the OECD/G20 Inclusive Framework and the need for a consensus-based multilateral solution. The letter rejects any compromise involving a delay in DST collection and calls for a strong U.S. response, including a Section 301 investigation, to address the perceived unreasonable and discriminatory impact of Canada’s DST.