The weakened after the Supreme Court ruled Friday that President Trump overstepped his authority by using emergency powers to impose broad tariffs, forcing the administration to adjust its trade strategy. The decision removed most of the previously implemented measures, immediately narrowing a policy channel that had been contributing to government revenue. Within hours, the White House issued a proclamation introducing a temporary 10% levy on all goods entering the U.S., followed by a Saturday announcement that the rate would be lifted to 15%. The rapid sequence underscores how central tariff income has become to the administration’s fiscal expansion plans, and currency markets reacted accordingly.
The dollar index fell 0.3% to 97.483 and earlier touched a five-day low of 97.355, reflecting investor reassessment of the policy mix. The decline suggests that markets are less focused on the nominal increase from 10% to 15% and more concerned about legal durability and revenue predictability. If tariffs are perceived as vulnerable to further judicial challenge or subject to short-term adjustments, their reliability as a funding source diminishes. That uncertainty weighs on the dollar, particularly at a time when fiscal commitments remain elevated and clarity on long-term revenue mechanisms is limited.
For currency investors, the key variable now is whether the revised 15% framework proves legally sustainable and politically durable. The base case is that the administration stabilizes the tariff regime under clearer statutory authority, restoring some revenue visibility and limiting further downside pressure on the dollar. The risk scenario is renewed legal or legislative resistance that constrains tariff collection, amplifying fiscal uncertainty and extending the dollar’s softness below the recent 97.355 low. Near-term price action in the DXY will hinge on whether markets gain confidence in the durability of the new structure or continue to question its foundation.
