The U.S. Supreme Court’s strike-down of IEEPA tariffs forces the administration to pivot to Section 301 investigations, triggering a 10% global levy. Barclays notes this shift risks fiscal slippage as lost tariff revenue—0.5%-0.7% of GDP—could widen deficits. Markets brace for potential $175 billion in tariff refunds, likely financed via T-bill issuance, with long-end swap spreads tightening if deficits deepen.

U.S. Treasuries face dual pressures: refunds may boost supply, but reduced tariff income could steepen the yield curve. Inflation markets show muted reaction due to pricing inertia, though front-end breakevens dip slightly. FX traders eye high-carry EM currencies and G10 peers with strong fundamentals, as lower tariff risks bolster growth optimism amid policy uncertainty.

The ruling underscores U.S. institutional checks, potentially lowering dollar risk premiums. While markets partially priced the outcome, policymakers’ alternative measures—like new Section 301 probes—will dictate near-term volatility. Analysts stress that sustained tariff reductions could reshape trade dynamics, with implications for global supply chains and investor portfolios.

$175 billion in estimated tariff refunds and the 10% global tariff under Section 301 highlight the ruling’s economic scale. The U.S. dollar’s resilience against majors reflects institutional confidence, even as fiscal and trade policy shifts remain pivotal. Investors must monitor how these developments ripple through rates, FX, and deficit trajectories.