**US and Canadian officials failed to finalize a bilateral trade arrangement in late August 2026 after weeks of negotiations, triggering 50 percent U.S. Section 338 tariffs on roughly $20 billion of Canadian goods effective August 22 and matching Canadian retaliatory surtaxes on U.S. imports effective September 8.** The breakdown followed disputes over terms involving motor vehicles, dairy, steel and aluminum, autos, and broader USMCA commitments, with each side attributing collapse to the other’s last-minute changes. Subsequent U.S. actions included scope adjustments to the tariffs effective September 15 and import prohibitions on select Canadian products effective September 29. The USMCA joint review process continues without U.S. renewal of the current agreement, leaving annual reviews required through 2036. No new diplomatic framework to reduce or remove the layered tariffs has emerged as of early October, though statements from both governments have referenced potential future talks. Trader assessments of any near-term agreement to lower tariffs therefore hinge on whether stalled bilateral discussions resume amid ongoing sectoral duties and procurement restrictions.